07 95 00 Maintenance and Repair-1204(Apr).pdf

IDIQ ROOF MAINTENANCE/REPAIR/REPLACEMENT VNVP 111080

07 95 00 Maintenance and Repair

Page 1 of 26 Pages

April 2012

07 95 00

MAINTENANCE AND REPAIR

PART 1: GENERAL

1.1. APPLICABLE PUBLICATIONS: See Section 07 31 13 “Asphalt Shingles”, Section

07 42 13 “Metal Wall Panels”, Section 07 51 13 “Built Up Roofing”, Section 07 60 00

“Flashing and Sheet Metal”, and Section 07 61 14 “Standing Seam Roofing” for reference publications. Publications listed in these sections form a part of this specification to the extent referenced. The publications are referred to in the text by the by the basic designations only.

1.2. GENERAL REQUIREMENTS: The contractor will be required to perform maintenance and repair work on existing built-up roofing membranes, existing shingled roofs, and existing metal roof systems, flashings and associated items on facilities throughout the base. This section, is an addition to the manufacturer’s recommendations, Section 07 31 13 “Asphalt Shingles”, Section 07 42 13 “Metal Wall Panels”, Section 07 51

13 “Built Up Roofing”, Section 07 60 00 “Flashing and Sheet Metal”, and Section 07 61 14

“Standing Seam Roofing” and the recommendations of the NRCA and ARMA as contained in the above referenced publication, outlines the materials and procedures to be used when conducting the specified maintenance and repair work. Asphalt bitumen shall always be used for the maintenance and repair of asphalt built-up roofs. The terms “bitumen” and

“bituminous” are used to indicate asphalt bitumen when asphalt roof maintenance or repair is discussed and coal tar bitumen when coal tar roof maintenance or repair is discussed.

1.3. WARRANTIES/GUARANTIES: The contractor will be required to maintain all warranties/guaranties in effect at the time maintenance or repair is performed. Sheppard

AFB has many facilities with manufacturer’s warranted Roofs.

1.3.1. At the time of maintenance or repair contractor will be informed if building has a warranty in effect.

1.4. SUBMITTALS:

1.4.1. Material Submittals: Material submittals shall be accomplished as specified in

Section 01 33 00 “PROJECT SUBMITTALS” and Section 07 31 13 “Asphalt

Shingles”, Section 07 42 13 “Metal Wall Panels”, Section 07 51 13 “Built Up Roofing”, Section 07 60 00 “Flashing and Sheet Metal”, and Section 07 61 14 “Standing Seam

Roofing”.

1.4.2. Submittal #1: Built-Up Roofing (BUR) Manufacturer Pre-Award Certification

Submittal. Each manufacturer shall provide an executed copy of the Built-Up Roofing

(BUR) Manufacturer Pre-Award Certification Submittal (Submittal #1) prior to award and yearly thereafter.

1.5. EQUIPMENT: Machines, tools, and equipment used in the performance of the work required by this section shall be the same equipment specified in Section 07 31 13 “Asphalt

07 95 00 Maintenance and Repair

Page 2 of 26 Pages

April 2012

Shingles”, Section 07 42 13 “Metal Wall Panels”, Section 07 51 13 “Built Up Roofing”, Section 07 60 00 “Flashing and Sheet Metal”, and Section 07 61 14 “Standing Seam

Roofing”, and shall be maintained in a satisfactory and safe condition.

1.6. DELIVERY AND STORAGE: Materials delivered to the site and stored in accordance with Section 07 31 13 “Asphalt Shingles”, Section 07 42 13 “Metal Wall Panels”, Section

07 51 13 “Built Up Roofing”, Section 07 60 00 “Flashing and Sheet Metal”, and Section 07

61 14 “Standing Seam Roofing”.

PART 2: PRODUCTS: See Section 07 31 13 “Asphalt Shingles”, Section 07 42 13

“Metal Wall Panels”, Section 07 51 13 “Built Up Roofing”, Section 07 60 00 “Flashing and

Sheet Metal”, and Section 07 61 14 “Standing Seam Roofing”.

PART 3: EXECUTION:

3.1. The following maintenance and repair procedures are typical for both Built-Up Roofing and Metal Roofing.

3.1.1. PROCEDURES FOR EDGE, FASCIA, EAVE, OR RAKE METAL

FLASHING:

3.1.1.1. Structural Damage To Edge, Fascia, Eave or Rake Metal Flashing:

Carefully remove damaged edge, fascia, eave or rake metal flashing. Fabricate and install new edge, fascia, eave or rake metal flashing according roofing system manufacturer’s recommendations to provide a water tight installation. New edge, fascia, eave, or rake metal flashing shall match undamaged existing metal flashing in material, gage, finish, color, and contour.

3.1.1.1.1. For built-up roof system, remove and reinstall strip-in flashing as described in paragraph 3.2.3. of this section.

3.1.1.1.2. For metal roof system, install metal utilizing new gasketed fasteners and new sealant tape or sealant beads.

3.1.1.2. Open Joints in Edge, Fascia, Eave or Rake Metal Flashing: Fabricate and install new joint cover to match existing joint covers or profile of existing metal.

Set new joint cover in strips of butyl tape sealant according roofing system manufacturer’s recommendations to provide a water tight installation. New joint cover shall match undamaged existing metal in material, gage, finish, color, and contour.

3.1.1.2.1. For built-up roof system, remove and reinstall strip-in flashing as described in paragraph 3.2.3. of this section.

3.1.1.2.2. For metal roof system, install metal utilizing new gasketed fasteners and new sealant tape or sealant beads.

3.1.1.3. Missing Joint Covers in Edge, Fascia, Eave or Rake Metal Flashing:

Fabricate and install new joint cover to match existing joint covers or profile of existing metal flashing. Set new joint cover in strips of butyl tape sealant according roofing system manufacturer’s recommendations to provide a water tight

07 95 00 Maintenance and Repair

Page 3 of 26 Pages

April 2012 installation. New joint cover shall match undamaged existing metal in material, gage, finish, color, and contour.

3.1.1.3.1. For built-up roof system, remove and reinstall strip-in flashing as described in paragraph 3.2.3. of this section.

3.1.1.3.2. For metal roof system, install metal utilizing new gasketed fasteners and new sealant tape or sealant beads.

3.1.1.4. Missing Edge, Fascia, Eave or Rake Metal Flashing: Fabricate and install new edge, fascia, eave or rake metal flashing according roofing system manufacturer’s recommendations to provide a water tight installation. New edge, fascia, eave, or rake metal flashing shall match undamaged existing metal flashing in material, gage, finish, color, and contour.

3.1.1.4.1. For built-up roof system, remove and reinstall strip-in flashing as described in paragraph 3.2.3. of this section.

3.1.1.4.2. For metal roof system, install metal utilizing new gasketed fasteners and new sealant tape or sealant beads.

3.1.2. PROCEDURES FOR METAL COUNTER-FLASHING:

3.1.2.1. Metal Counter-Flashing Separated From Vertical Surface: Reattach counterflashing, using appropriate sized fasteners. Clean existing receiver/reglet.

Reinstall existing flashing in receiver/reglet. Provide new wedges or fasteners as necessary. Install new sealant material.

3.1.2.2. Structural Damage to Metal Counter-Flashing: Carefully remove damaged counter-flashing. Fabricate and install new counter-flashing according roofing system manufacturer’s recommendations to provide a water tight installation. New counter flashing shall match undamaged existing counter-flashing in material, gage, finish, color, and contour. Install counter flashing utilizing new gasketed fasteners and new sealant tape or sealant beads.

3.1.2.3. Open Laps In Metal Counter-Flashing:

3.1.2.3.1. For lapped joints, install sealant material in open laps. Pop rivet or fasten open laps to prevent reopening in future.

3.1.2.3.2. For joints with joint covers. Fabricate and install new joint cover to match existing joint covers or profile of existing metal. Set new joint cover in strips of butyl tape sealant according roofing system manufacturer’s recommendations to provide a water tight installation. New joint cover shall match undamaged existing metal in material, gage, finish, color, and contour.

Install metal utilizing new gasketed fasteners and new sealant tape or sealant beads.

3.1.2.4. Missing Metal Counter-Flashing: Fabricate and install new counter-flashing according roofing system manufacturer’s recommendations to provide a water tight installation. New counter flashing shall match undamaged existing

07 95 00 Maintenance and Repair

Page 4 of 26 Pages

April 2012 counter-flashing in material, gage, finish, color, and contour. Install counter flashing utilizing new gasketed fasteners and new sealant tape or sealant beads.

3.1.3. PROCEDURES FOR EXPANSION JOINT COVERS:

3.1.3.1. Deteriorated Elastomeric Expansion Joint: Remove deteriorated elastomeric type expansion joint covers. Provide and install new elastomeric type expansion joint covers or fabricate and install new metal type expansion joint covers.

3.1.3.2. Split Joints In Elastomeric Expansion Joint: Remove and replace split joint covers, if applicable. Reglue separated joints in bellows not having joint covers.

3.1.3.3. Structural Damage to Metal Expansion Joint: Remove damaged sections and fabricate and install new metal to match existing undamaged sections. Furnish and install new sealant and fasteners as necessary.

3.1.3.4. Open Laps In Metal Expansion Joint: Install sealant material in open laps.

Pop rivet or fasten open laps to prevent reopening in future.

3.1.3.5. Missing Expansion Joint: Provide and install new elastomeric expansion joint or fabricate and install new metal expansion joint. Set new metal joint covers in strips of butyl tape sealant.

3.1.4. PROCEDURES FOR CONCRETE COPING STONE AT PARAPET

WALLS:

3.1.4.1. Deteriorated Mortar Joints In Coping Stone: Rake all deteriorated mortar out of joints between coping stones. Repoint mortar joints with a mixture of

Portland cement, hydrated lime, and mortar sand proportioned at a ratio of 1:1:6 by volume.

3.1.5. PROCEDURES FOR METAL COPING AT PARAPET WALLS:

3.1.5.1. Structural Damage To Metal Coping Flashing: Remove damaged metal coping flashing and fabricate and install new metal coping flashing to match existing undamaged sections. Furnish and install new sealant and fasteners as necessary.

3.1.5.2. Open Joints In Metal Coping Flashing: Install sealant material in open laps. Pop rivet or fasten open laps to prevent reopening in the future.

3.1.5.3. Missing Joint Covers In Metal Coping Flashing: Fabricate and install new metal joint covers to match surrounding metal joint covers or to match metal coping profile. Furnish and install new sealant and fasteners as necessary.

3.1.5.4. Missing Metal Coping Flashing: Fabricate and install new metal coping flashing to match surrounding existing sections. Furnish and install new sealant and fasteners as necessary.

3.1.6. PROCEDURES FOR METAL GUTTERS:

07 95 00 Maintenance and Repair

Page 5 of 26 Pages

April 2012

3.1.6.1. Structural Damage to Metal Gutter: Carefully remove damaged metal gutter. Fabricate and install new metal gutter according roofing system manufacturer’s recommendations to provide a water tight installation. New gutter shall match undamaged existing metal gutter in material, gage, finish, color, and contour.

3.1.6.1.1. For built-up roof system, remove and reinstall strip-in flashing as described in paragraph 3.2.3. of this section.

3.1.6.1.2. For metal roof system, install metal utilizing new gasketed fasteners and new sealant tape or sealant beads.

3.1.6.2. Missing Metal Gutter: Fabricate and install new metal gutter according roofing system manufacturer’s recommendations to provide a water tight installation. New gutter shall match undamaged existing metal gutter in material, gage, finish, color, and contour.

3.1.6.2.1. For built-up roof system, remove and reinstall strip-in flashing as described in paragraph 3.2.3. of this section.

3.1.6.2.2. For metal roof system, install metal utilizing new gasketed fasteners and new sealant tape or sealant beads.

3.1.6.3. Damaged Metal Gutter Hangars or Straps: Carefully remove damaged metal gutter hangar or strap. Fabricate and install new metal gutter strap or hangar according roofing system manufacturer’s recommendations to provide a water tight installation. New gutter strap or hangar shall match undamaged gutter straps or hangars in material, gage, finish, color, and contour.

3.1.6.3.1. For built-up roof system, remove and reinstall strip-in flashing as described in paragraph 3.2.3. of this section.

3.1.6.3.2. For metal roof system, install metal utilizing new gasketed fasteners and new sealant tape or sealant beads.

3.1.6.4. Missing Metal Gutter Hangars or Straps: Fabricate and install new metal gutter strap or hangar according roofing system manufacturer’s recommendations to provide a water tight installation. New gutter strap or hangar shall match undamaged gutter straps or hangars in material, gage, finish, color, and contour.

3.1.6.4.1. For built-up roof system, remove and reinstall strip-in flashing as described in paragraph 3.2.3. of this section.

3.1.6.4.2. For metal roof system, install metal utilizing new gasketed fasteners and new sealant tape or sealant beads.

3.1.6.5. Metal Gutter Filled With Aggregate, Leaves, Dirt, Or Other Debris:

Remove and dispose of aggregate, leaves, dirt, or other debris existing in metal gutters.

3.1.7. PROCEDURES FOR METAL DOWNSPOUTS:

07 95 00 Maintenance and Repair

Page 6 of 26 Pages

April 2012

3.1.7.1. Structural Damage to Metal Downspout: Carefully remove damaged metal downspout. Fabricate and install new metal downspout according roofing system manufacturer’s recommendations to provide a water tight installation. New downspout shall match undamaged existing metal downspout in material, gage, finish, color, and contour. Install metal utilizing new gasketed fasteners and new sealant tape or sealant beads. Furnish and install new downspout straps, sealant and fasteners as necessary.

3.1.7.2. Missing Metal Downspout: Fabricate and install new metal downspout according roofing system manufacturer’s recommendations to provide a water tight installation. New downspout shall match undamaged existing metal downspout in material, gage, finish, color, and contour. Install metal utilizing new gasketed fasteners and new sealant tape or sealant beads. Furnish and install new downspout straps, sealant and fasteners as necessary.

3.1.7.3. Damaged Metal Downspout Straps: Carefully remove damaged metal downspout strap. Fabricate and install new metal downspout strap according roofing system manufacturer’s recommendations to provide a water tight installation. New downspout strap shall match undamaged downspout straps in material, gage, finish, color, and contour. Install metal utilizing new gasketed fasteners and new sealant tape or sealant beads.

3.1.7.4. Missing Metal Downspout Straps: Fabricate and install new metal downspout strap according roofing system manufacturer’s recommendations to provide a water tight installation. New downspout strap shall match undamaged downspout straps in material, gage, finish, color, and contour. Install metal utilizing new gasketed fasteners and new sealant tape or sealant beads.

3.1.7.5. Metal Downspout Filled With Aggregate, Leaves, Dirt Or Other Debris:

Remove and dispose of aggregate leaves, dirt, or other debris existing in metal downspouts. Remove and replace section of downspout as necessary. Clean full length for downspout discharging onto ground. Clean from gutter to earth or cast iron boot for downspouts discharging into underground drainage system.

3.1.7.6. Underground Drainage System Clogged at Downspout: Remove sections of downspout to gain access at ground level, snake out clog, reinstall downspout sections. Ensure the downspout drains freely.

3.1.8. PROCEDURES FOR METAL DOWNSPOUT CONDUCTOR HEADS:

3.1.8.1. Structural Damage to Metal Downspout Conductor Head: Carefully remove damaged metal downspout conductor head. Fabricate and install new metal downspout conductor head according roofing system manufacturer’s recommendations to provide a water tight installation. New downspout conductor head shall match undamaged existing metal downspout conductor head in material, gage, finish, color, and contour. Install metal utilizing new gasketed fasteners and new sealant tape or sealant beads. Furnish and install new downspout conductor head straps, sealant and fasteners as necessary.

07 95 00 Maintenance and Repair

Page 7 of 26 Pages

April 2012

3.1.8.2. Missing Metal Downspout Conductor Head: Fabricate and install new metal downspout conductor head according roofing system manufacturer’s recommendations to provide a water tight installation. New downspout conductor head shall match undamaged existing metal downspout conductor head in material, gage, finish, color, and contour. Install metal utilizing new gasketed fasteners and new sealant tape or sealant beads. Furnish and install new downspout conductor head straps, sealant and fasteners as necessary.

3.1.8.3. Damaged Metal Downspout Conductor Head Straps: Carefully remove damaged metal downspout conductor head strap. Fabricate and install new metal downspout conductor head strap according roofing system manufacturer’s recommendations to provide a water tight installation. New downspout conductor head strap shall match undamaged downspout conductor head straps in material, gage, finish, color, and contour. Install metal utilizing new gasketed fasteners and new sealant tape or sealant beads.

3.1.8.4. Missing Metal Downspout Conductor Head Straps: Fabricate and install new metal downspout conductor head strap according roofing system manufacturer’s recommendations to provide a water tight installation. New downspout conductor head strap shall match undamaged downspout conductor head straps in material, gage, finish, color, and contour. Install metal utilizing new gasketed fasteners and new sealant tape or sealant beads.

3.1.9. PROCEDURES FOR SEALANT MATERIAL AT REGLET/RECEIVER

TYPE FLASHINGS:

3.1.9.1. Sealant Material Deteriorated: Remove existing deteriorated sealant material by scraping or other approved methods. Prepare the area or joint for sealant installation by wire brushing to remove loose residual sealant material, dust, paint, and debris that would prevent new sealant material from sticking to the surfaces.

3.1.9.1.1. Ensure the joint is dry and clean prior to installing new sealant material. Install the specified sealant material in a well-distributed bead in accordance with the manufacturer's recommendations.

3.1.9.1.2. Notify the Contracting Officer of any touch-up painting necessary.

3.1.9.2. Sealant Material Missing: Prepare the areas or joint for sealant installation by wire brushing to remove loose residual sealant material, dust, paint, and debris that would prevent new sealant material from sticking to the surfaces.

3.1.9.2.1. Ensure the joint is dry and clean prior to installing new sealant material. Install the specified sealant material in a well-distributed bead in accordance with the manufacturer's recommendations.

3.1.9.2.2. Notify the Contracting Officer of any touch-up painting necessary.

3.1.10. PROCEDURES FOR JOINTS IN TILT-UP CONCRETE PANELS OR

EXPANSION JOINTS IN MASONRY: Maintenance of joints in tilt-up concrete

07 95 00 Maintenance and Repair

Page 8 of 26 Pages

April 2012 panels or expansion joints in masonry will normally be required only from just beneath the metal coping or below the coping stone to the top of the metal counter-flashing on the inside of the parapet wall and to a level below the roof deck on the outside of the wall or parapet. However, the contractor may be required to maintain joints in tilt-up concrete panels or expansion joints in masonry on the outside of the wall or parapet from the coping down the full height of the wall, to include any horizontal joints in tilt-up concrete panels occurring between the coping and the grade beam.

3.1.10.1. Sealant Material Deteriorated: Remove existing deteriorated sealant material by scraping or other approved methods. Prepare the area or joint for sealant installation by wire brushing to remove loose residual sealant material, dust, paint, and debris that would prevent new sealant material from sticking to the surfaces.

3.1.10.1.1. Ensure the joint is dry and clean prior to installing new sealant material. Install the specified sealant material in a well-distributed bead in accordance with the manufacturer’s recommendations.

3.1.10.1.2. Notify the Contracting Officer of any touch-up painting necessary.

3.1.10.2. Sealant Material Missing: Prepare the areas or joint for sealant installation by wire brushing to remove loose residual sealant material, dust, paint, and debris that would prevent new sealant material from sticking to the surfaces.

3.1.10.2.1. Ensure the joint is dry and clean prior to installing new sealant material. Install the specified sealant material in a well-distributed bead in accordance with the manufacturer's recommendations.

3.1.10.2.2. Notify the Contracting Officer of any touch-up painting necessary.

3.1.11. PROCEDURES FOR DOWNSPOUTS DISCHARGING IMPROPERLY:

3.1.11.1. Downspouts should not discharge directly onto the roofing membrane.

When this occurs, erosion of the aggregate surfacing exposed the felts and flood coat to weathering and further erosion, ultimately resulting in failure.

3.1.11.1.1. Deteriorated Metal Splash Pans: Carefully remove and dispose of existing deteriorated metal splash pans. Effect repair of the roofing membrane as described above if necessary. Fabricate and install new metal splash pans set in roofing cement or hot bitumen directly onto the roofing membrane as recommended by the manufacturer.

3.1.11.1.2. Missing Metal Splash Pans: Spud back existing aggregate surfacing in the area where metal splash pan is required. Fabricate and install new metal splash pans set in roofing cement or hot bitumen directly onto the roofing membrane as recommended by the manufacturer.

3.1.11.2. Downspouts should not discharge directly onto ground surrounding the facility. When this occurs, erosion of earth undermines the facility foundations, ultimately resulting in structural problems.

07 95 00 Maintenance and Repair

Page 9 of 26 Pages

April 2012

3.1.11.2.1. Deteriorated Concrete Splash Blocks: Remove and dispose of existing deteriorated concrete splash blocks. Provide and install earthen fill dirt and level up the area beneath the downspout discharge where the new concrete splash block will be placed if necessary. Provide and install pre-cast concrete splash blocks directly beneath the downspout discharge as shown in the plans.

3.1.11.2.2. Missing Concrete Splash Blocks: Provide and install earthen fill dirt and level up the area beneath the downspout discharge where the new concrete splash block will be placed if necessary. Provide and install pre-cast concrete splash blocks directly beneath the downspout discharge as shown in the plans.

3.1.12. PROCEDURES FOR LEAKING INTERIOR GUTTERS:

3.1.12.1. Interior Gutters With Minor Deterioration: Spud back existing aggregate surfacing, strip-in felts, and remove existing metal edge.

3.1.12.1.1. Line the gutter with a 60 Mil thickness EPDM rubber liner. Prior to unrolling, cut the roll of EPDM to the width necessary to lie loose inside the gutter, extend up the sides and lap the nailer for its full width. Roll the EPDM liner out lengthwise to joints. Provide the manufacturer's recommended lap and glue the joints together. Lay the liner into the gutter loose and fasten downward into the nailer only for the full length. Securely glue the liner to the gutter at downspouts for a distance of ½ the gutter width all around the downspout. Fasten the EPDM liner to the gutter at the downspouts with pan head sheet metal screws encircling the downspout to ensure the glue will not pull loose. Glue down an additional strip of EPDM to cover the screws with at least a 3 inch lap to ensure watertight integrity at downspouts.

3.1.12.1.2. Reinstall existing metal edge or provide and install new metal edge as condition require. Install new strip-in felts, flood coat and aggregates surfacing.

3.1.12.2. Interior Gutters With Major Deterioration: Spud back existing aggregate surfacing and strip-in felts and remove existing metal edge and deteriorated section of existing gutter.

3.1.12.2.1. Fabricate and install new metal gutter to match existing undeteriorated sections.

3.1.12.2.2. Complete the installation of EPDM liner and edge metal as described above.

3.2. The following maintenance and repair procedures are typical for Built-Up Roofing.

3.2.1. PROCEDURES FOR AGGREGATE SURFACED BUILT-UP ROOF

MEMBRANES:

3.2.1.1. Repair Bituminous Coatings, Exposed: When bituminous coatings are exposed, leaving bare spots, the gravel surfacing shall be spudded or scraped from

07 95 00 Maintenance and Repair

Page 10 of 26 Pages

April 2012 the bare area and the bare area broomed clean. On asphalt built-up roofs, a thin coat of asphalt primer, conforming to ASTM D 41, shall be applied to the old asphalt surface before applying the new asphalt flood coat. Allow the primer to dry prior to the application of the new asphalt flood coat.

3.2.1.1.1. Cover the area with hot asphalt bitumen applied at the rates of 60 pounds per square of Asphalt 25% per square of roof surface for built-up roofs.

3.2.1.1.2. Into the hot bitumen, embed aggregate surfacing at the rate of 400 pounds of gravel +/- 25% per square of roof surface for built-up roofs. Hot bitumen shall never be applied over aggregate surfacing as the bitumen will not adhere to these surfaces, and water will penetrate under the bitumen.

3.2.1.2. Repair Bituminous Coating-Weathered Severely Over Entire Roof Area:

When the bituminous coating and aggregate are severely weathered over the entire roof area; as much of the bituminous coating and aggregate surfacing as possible shall be removed by scraping or spudding. Accomplished this removal in cool weather. When large areas of roof are involved, the use of mechanical equipment to remove the bituminous coating and aggregate surfacing material is more economical than hand methods and is permissible. Disintegrated felts shall be replaced and damaged areas, blisters and buckles shall be repaired. Loose materials shall be swept away and disposed of. On asphalt built up roofs, a thin coat of asphalt primer, conforming to ASTM D 41, shall be applied to the old asphalt surface before applying the new asphalt flood coat. Allow the primer to dry prior to the application of the new asphalt flood coat. Apply hot bitumen and aggregate surfacing as described above (reference paragraph 3.2.1.1.1. and paragraph

3.2.1.1.2.).

3.2.1.3. Repair Exposed Felts:

3.2.1.3.1. Repair Exposed Felts, with no Disintegration: If the bituminous coating has been exposed for an extended period and has weathered to the extent that the top ply of felt is exposed, but is still in good condition and not disintegrated, remove dust and dirt from the areas of exposed felt. Apply hot bitumen and aggregate surfacing as described above (reference paragraph

3.2.1.1.1. and paragraph 3.2.1.1.2.).

3.2.1.3.2. Repair Exposed and Partially Disintegrated Felts Small Areas:

Scrape or spud all surfacing material and aggregate 2 ½ feet back beyond the disintegrated felts to expose sound felts. Remove disintegrated felts by cutting.

Removals shall be square or rectangular in shape. Remove and replace or allow to dry any waterlogged insulation. Fibrous glass and foam insulation can usually be dried, perlite will usually require replacement. If insulation is replaced, cut new insulation to fit tightly and bring the insulation up to match the level of insulation to remain. Attach insulation to the deck by mopping or mechanically fastening. Use two layers. Make insulation repairs with perlite insulation.

07 95 00 Maintenance and Repair

Page 11 of 26 Pages

April 2012

3.2.1.3.2.1. Level up the area by installing felts of the same number and type as in the surrounding roof membrane. Set the felts in hot bitumen mopped in place.

3.2.1.3.2.2. Install additional felts over the cut to cover repair area with four layers of felt. Solid mop each layer into place in hot bitumen.

Overlap repaired areas 3 inches on all sides with first layer. Lap each succeeding layer 3 inches on all sides over layer below.

3.2.1.3.2.3. Apply hot bitumen and aggregate surfacing as described above (reference paragraph 3.2.1.1.1. and paragraph 3.2.1.1.2.).

3.2.1.3.3. Exposed And Disintegrated Felts, Large Areas: No definite criteria are established to determine the repair method to be employed. Repairs will be carried out by one of three methods, determined by roofing engineer and as outlined below.

3.2.1.3.3.1. Repair as described above, in paragraph 3.2.1.3.2

3.2.1.3.3.2. Repair as described above, in paragraph 3.2.1.6.

3.2.1.3.3.3. Repair by replacement as described in Section 01 51 13:

BUILT-UP ROOFING (REROOFING).

3.2.1.4. Repair Blisters, Buckles, or Ridges:

3.2.1.4.1. Repair Small Blisters, Buckles, or Ridges:

3.2.1.4.1.1. If the felts of small blisters, buckles or ridges are NOT exposed, then disregard them and perform no action.

3.2.1.4.1.2. If small blisters, buckles, or ridges have been existing for an extended period and the felts are exposed, then dust and dirt shall be brushed from the exposed areas. Apply hot bitumen and aggregate surfacing as described above (reference paragraph 3.2.1.1.1. and paragraph 3.2.1.1.2.).

3.2.1.4.2. Repair Large Blisters, Buckles, or Ridges:

3.2.1.4.2.1. Disregard and perform NO repairs to large blisters, buckles or ridges, unless they allow water to penetrate the roofing membrane. If large blisters, buckles, or ridges are not causing leaks, leave them intact.

3.2.1.4.2.2. If large blisters, buckles, or ridges are allowing water to penetrate the roofing membrane or they are causing leaks.

3.2.1.4.2.2.1. Remove all surfacing material and aggregate 3 feet back (from large blisters, buckles or ridges that have disintegrated or cracked) to expose sound felts. Removal shall be by scraping or spudding off. All blistered plies shall be skived off with a square shovel or spade so that no loose felt remains.

07 95 00 Maintenance and Repair

Page 12 of 26 Pages

April 2012

3.2.1.4.2.2.2. Install additional felts over the prepared areas to cover repaired area with four layers of felts. Solid mop each layer into place in hot bitumen. Overlap the prepared area 6 inches on all sides with first layer. Lap each additional layer 3 inches on all sides over layer below. Hold the top portion of the base flashing sheet even with or overlapping the nailer or curb and securely nail in place with roofing nails at a minimum of 8" O.C. Extend the base flashing sheet out onto the roof surface a minimum distance of 8 inches and set the base sheet in steep asphalt or flashing cement as recommended by the

BURS Manufacturer. Lap all vertical seams as recommended by the

BURS Manufacturer.

3.2.1.4.2.2.3. Apply hot bitumen and aggregate surfacing as

described above (reference paragraph 3.2.1.1.1. and paragraph

3.2.1.1.2.).

3.2.1.5. Repair Roof Membrane Splits: Splits in the built-up roof membrane shall be repaired as described above, in paragraph 3.2.1.5., except that prior to flood coating and aggregate surfacing, it is usually only necessary to mop on the four ply capping. Excessive curling of the roofing felts at the split shall be cut away so the capping will lie flat. However, if there is excessive moisture in the split, the area may require opening up and replacement or drying of the insulation undertaken.

3.2.1.5.1. If splitting is extensive or occurs in a pattern, the contractor and the construction inspector will endeavor to determine the cause of the splitting and determine what corrective action, other than that specified above, is required.

3.2.1.6. Repair Bituminous Base Flashings: For the length of the repaired area, spud back the surfacing material and aggregate for a minimum of 1 ½ feet back from the vertical surface onto the roof surface. For the length of the repaired area, remove the base flashing sheet, by cutting or spudding it away flush with roof surface.

3.2.1.6.1. Lift or remove metal counter-flashing to expose the top of the curb or nailer. Remove curb mounted mechanical equipment, vents, fans, etc. as required to expose the top of the curb or nailer. Check the distance from roof surface to top of curb or nailer. Distance must equal or exceed 8 inches.

Notify the Roofing Engineer if it does not. Remove and dispose existing cant strip. Install new cant strip set in hot bitumen.

3.2.1.6.2. Install the base flashing sheet. Hold the top portion of the base flashing sheet even with or overlapping the vertical nailer and securely nail in place with roofing nails at a minimum of 8” O.C. Extend the base flashing sheet out onto the roof surface a minimum distance of 8” and set the base sheet in steep asphalt or flashing cement as recommended by the BURS

Manufacturer. Lap all vertical seams are recommended by the BURS

Manufacturer and securely seal them with steep asphalt or flashing cement as recommended by the BURS Manufacturer.

07 95 00 Maintenance and Repair

Page 13 of 26 Pages

April 2012

3.2.1.6.3. Reinstall counter-flashing and/or curb mounted mechanical equipment, vents, fans, etc., as appropriate.

3.2.1.6.4. Apply hot bitumen and aggregate surfacing as described above

(reference paragraph 3.2.1.1.1. and paragraph 3.2.1.1.2.).

3.2.1.7. Repair Open Vertical Laps in Bituminous Base Flashing: Apply flashing cement into open laps and smooth laps back in place. Coat the entire lap in flashing cement and set a 4 inch strip of treated woven glass fabric in flashing cement centered on the lap, apply a second coat of flashing cement over the fabric to completely seal the lap.

3.2.1.7.1. Lift or remove metal counter flashing and/or curb mounted mechanical equipment, vents, fans, etc. to expose the top of the open vertical lap, complete the repair, and reinstall counter-flashing and/or curb mounted mechanical equipment, vents, fans, etc. as appropriate.

3.2.1.8. Separation of Bituminous Base Flashing From Wall or Nailer: Lift or remove metal counter-flashing and/or curb mounted mechanical equipment, vents, fans, etc. to expose the top of the curb or nailer.

3.2.1.8.1. Gently raise the displaced base flashing sheet and reattach it to the curb or nailer. This is best performed during warm periods to avoid cracking the flashing sheet. If the flashing sheet is to brittle and cracks, complete the repair as described in paragraph 3.2.1.6.

3.2.1.8.2. Recoat the raised flashing sheet with a liberal coating of flashing cement.

3.2.1.8.3. Reinstall counter-flashing and/or curb mounted mechanical equipment, vents, fans, etc. as appropriate.

3.2.2. PROCEDURES FOR METAL BASE FLASHINGS USED IN BUILT-UP

ROOFS:

3.2.2.1. Lack Of Protective Coating On Metal Base Flashing Resulting In Mild

Damage: Perform surface preparation and apply new protective coating (paint) in accordance with Steel Structures Painting Council as specified in Section 07 51 13:

BUILT-UP ROOFING (REROOFING).

3.2.2.2. Lack of Protective Coating on Metal Base Flashing Resulting in Severe

Damage: Spud back the surfacing material and aggregate surfacing for a minimum of 1 1/2 feet back from the vertical surface onto the roof surface. Remove deteriorated base flashing.

3.2.2.2.1. Lift or remove metal counter-flashings. Remove curb mounted mechanical equipment, vents, fans, etc. as required to expose the top of the curb or nailer. Separate metal base flashing from hot stacks. Check the distance from roof surface to top of curb or nailer. Distance must equal or exceed 8 inches. Notify the Roofing Engineer if it does not.

07 95 00 Maintenance and Repair

Page 14 of 26 Pages

April 2012

3.2.2.2.2. Never install metal base flashings for any reason. Always install bituminous base flashings against a curb. If existing unit or stack lacks a curb, fabricate and install new wood curb, complete with new metal counter-flashings, as shown in the drawings.

3.2.2.2.3. Ensure that the aggregate has been spudded back sufficiently around the hot stack. Trace the footprint of the curb on the membrane. Cut through the membrane and insulation down to the roof deck. Remove roof membrane and insulation from within the bounds of the cuts to expose the roof deck.

3.2.2.2.4. Install horizontal wood blocking/nailer as indicated on the plans and securely fasten to the roof deck with appropriate fasteners. If only one thickness of horizontal wood is required, securely fasten the vertical curb boards to the nailer with heavy screws prior to installing the horizontal wood

(secured from the back). If more than one thickness of horizontal wood is required, securely fasten the vertical curb boards to the last nailer with heavy screws prior to installing the horizontal wood (secured from the back). Total horizontal wood blocking thickness must match insulation thickness.

3.2.2.2.5. Use strips of roofing felts set in hot bitumen to bring the tip of the horizontal nailer up even with the surface of the built-up roof membrane. Set the cant strip in hot bitumen over these plies.

3.2.2.2.6. Install at least 4 plies of roofing felt set in hot bitumen in layer fashion. Set the first ply in hot bitumen flush with the top edge of the cant strip and extend it onto the roof surface at least 3 inches beyond the cut in the roof membrane. Install the three successive layers each one set even with the top edge of the cant strip and lapping over and extending onto the roof surface

3 inches beyond the underlying layer. Solid mop each layer into place in hot bitumen.

3.2.2.2.7. Install the base flashing sheet. Hold the top portion of the base flashing sheet even with or overlapping the vertical nailer and securely nail in place with roofing nails at a minimum of 8" O.C. Extend the base flashing sheet out onto the roof surface a minimum distance of 8 inches and set the base sheet in steep asphalt or flashing cement as recommended by the BURS

Manufacturer. Lap all vertical seams as recommended by the BURS

Manufacturer and securely seal them with steep asphalt or flashing cement as recommended by the BURS Manufacturer.

3.2.2.2.8. Reinstall counter-flashing or fabricate and install new metal counter-flashing as shown in the drawings. Reinstall curb mounted mechanical equipment, vents, fans, etc. as appropriate.

3.2.2.2.9. Apply hot bitumen and aggregate surfacing as described above

(reference paragraph 3.2.1.1.1. and paragraph 3.2.1.1.2.).

3.2.3. PROCEDURES FOR STRIP-IN FLASHING:

07 95 00 Maintenance and Repair

Page 15 of 26 Pages

April 2012

3.2.3.1. Holes, Splits, Or Deterioration In Strip-In Flashing: Spud back the surfacing material and aggregate surfacing for a minimum of 1 1/2 feet back from the edge of metal flanges and expose the metal flanges. Ensure that the metal flange of flange mounted units or edge metal is well fastened to the wood nailer for its entire length. Refasten any unsecured or raised flanges. Scrape or spud the exposed flange to remove excess built-up of bituminous material that would prevent strip-in plies from adhering to metal and prime the exposed metal.

3.2.3.1.1. Set the first strip-in ply in hot bitumen flush with the edge of the vertical surface or metal edge and extend it onto the roof surface at least 3 inches beyond the edge of the flange. Install the two successive layers each one lapping over and extending 3 inches beyond the underlying layer. Solid mop each layer into place in hot bitumen.

3.2.3.1.2. Apply hot bitumen and aggregate surfacing as described above

(reference paragraph 3.2.1.1.1. and paragraph 3.2.1.1.2.).

3.2.4. PROCEDURES FOR ROOF DRAINS AND ROOF DRAIN FLASHING

USED IN BUILT-UP ROOFS:

3.2.4.1. Roof Drain Flashing Defective: Plug roof drain prior to beginning work to prevent entry of debris. Spud back existing aggregate surfacing 2 ½ feet beyond line of new gravel guard strip-in flashing. Remove strainer and clamping ring. If lead or copper pan is present, spud back and remove strip-in flashing to expose joint between pan and roofing membrane. If lead or copper pan is not present, spud to expose the roofing membrane. Sweep the area clean. If missing, fabricate and install lead or copper pan, and set it in hot bitumen. Install new strip-in felts set in hot bitumen at pan/membrane juncture. Extend plies down to clamping ring surface. Install new copper gravel stop with strip-in felts. Clean the clamping ring.

3.2.4.1.1. Apply hot bitumen and aggregate surfacing as described above

(reference paragraph 3.2.1.1.1. and paragraph 3.2.1.1.2.).

3.2.4.2. Broken Roof Drain Strainer: Remove damaged or broken roof drain strainer and replace with new roof drain strainer. Some roof drains are Josam

Brand, cast iron with cast iron strainers.

3.2.4.3. Missing Roof Drain Strainer: Provide and install new strainer to replace missing strainer. Some roof drains are Josam Brand, cast iron with cast iron strainers.

3.2.4.4. Roof Drain Clogged: Remove strainer, snake out clog, reinstall strainer.

Ensure the roof drain drains freely

3.2.5. PROCEDURES FOR PITCH PANS:

3.2.5.1. Structural Damage to Pitch Pans: Remove damaged metal pitch pan and fabricate and install new metal pitch pan as shown on the plans. Total prefabricate new pitch pans if damage pitch pan can be lifted and removed without disturbing penetration being flashed. Leave one end of new pitch pan open and field fasten if

07 95 00 Maintenance and Repair

Page 16 of 26 Pages

April 2012 damaged pitch pan cannot be lifted and removed without disturbing penetration being flashed. Take care so as not to damage the sheet metal pitch dam if existing.

3.2.5.1.1. If existing damaged pitch pan has no wood nailer, securely fasten flanges with fasteners proper for the underlying roof deck. Fasteners shall extend through the insulation well into the roof deck below and be snugged to pull the flange up tight to the roof membrane. Set the flange in flashing cement and install strip-in flashing as described in paragraph 3.2.3.

3.2.5.1.2. If the existing damaged pitch pan has a wood nailer, securely fasten flanges with deck screws into wood nailer. Fasteners shall be snugged to pull the flange up tight to the roof membrane. Set the flange in flashing cement and install strip-in flashing as described in paragraph 3.2.3.

3.2.5.1.3. Fill pitch pan with hot bitumen or roofing cement and install cover.

Follow manufacturer's recommendations.

3.2.5.2. Missing Metal Pitch Pan: Fabricate and install new metal pitch pan as shown on the plans. Unless the surrounding roofing membrane and insulation is being removed, do not install wood nailers. Follow guidelines in paragraph

3.2.5.1., for installations.

3.2.5.3. Sealant Dried Out in Pitch Pan: Blow or clean loose debris. Remove old hardened sealant. Refill the pitch pan with hot bitumen or roofing cement. Provide and install cover. Follow manufacturer's recommendations.

3.2.6. PROCEDURES FOR LEAD PLUMBING VENT FLASHING:

3.2.6.1. Minor Structural Damage to Lead Plumbing Vent Flashing: If lead plumbing vent flashing has holes located more than 5 inches above the roof surface or does not return into the vent pipe, fabricate and install a lead cap similar to that shown in the "two-piece" alternate of the plumbing vent detail shown in the drawings. Two-piece alternate shall lap at least 1 inch below the hole and extend into the vent at leas 1 inch. If the hole is located less than 5 inches above the roof surface, solder the hole tight.

3.2.6.2. Major Structural Damage to Lead Plumbing Vent Flashing: If maintenance and/or repair cannot be completed as described above, replace the plumbing vent as described below.

3.2.6.3. Missing Lead Plumbing Vent Flashing: Provide and install new plumbing vent flashing as shown on the plans. Take care so as not to damage the sheet metal pitch dam if existing.

3.2.6.3.1. If existing damaged plumbing vent flashing has no wood nailer, securely fasten flanges with fasteners proper for the underlying roof deck.

Fasteners shall extend through the insulation well into the roof deck below and be snugged to pull the flange up tight to the roof membrane. Do not overtighten and bend the flashing flange. Set the flange in flashing cement and install strip-in flashing as described in paragraph 3.2.3.

07 95 00 Maintenance and Repair

Page 17 of 26 Pages

April 2012

3.2.6.3.2. If the existing damaged plumbing vent flashing has a wood nailer, securely fasten flanges with deck screws into wood nailer. Fasteners shall be snugged to pull the flange up tight to the roof membrane. Set the flange in flashing cement and install strip-in flashing as described in paragraph 3.2.3.

3.2.7. PROCEDURES FOR PIPE OR CONDUIT SUPPORTS:

3.2.7.1. Wood Blocking Used for Pipe or Conduit Support: Remove and dispose of wood blocking. Furnish and install Miro pipe supports as described above.

3.2.7.2. Pipe or Conduit Support Missing: Furnish and install Miro pipe support of the proper size. Spud back aggregate surfacing and set small piece of asphalt walk plank in hot bitumen as indicted in the plans. Install Miro pipe supports to well elevate the pipe above the roof surface. Stack supports as necessary to achieve the proper height.

3.2.8. PROCEDURES FOR WOOD EQUIPMENT CURBS:

3.2.8.1. Equipment Curb Missing Or Necessary For Future Equipment: Fabricate and install new equipment curb as indicated on the drawings. Equipment curb installation may be in support of base personnel or another contractor.

3.2.8.1.1. Locate the curb. Curbs must be installed so as not to buck water.

Curbs must be parallel to the roof slope. Spud back aggregate surfacing to expose the roofing membrane. Trace the footprint of the curb on the membrane. Cut through the membrane and insulation down to the roof deck.

Remove roof membrane and insulation from within the bounds of the cuts to expose the roof deck.

3.2.8.1.2. Install horizontal wood blocking/nailer as indicated on the plans and securely fasten to roof deck with appropriate fasteners. If only one thickness of horizontal wood is required, securely fasten the vertical curb boards to the nailer with heavy screws prior to installing the horizontal wood (secured from the back). If more than one thickness of horizontal wood is require, securely fasten the vertical curb boards to the last nailer with heavy screws prior to installing the horizontal wood (secured from the back). Total horizontal wood blocking thickness must match insulation thickness.

3.2.8.1.3. Use strips of roofing felts set in hot bitumen to bring the tip of the horizontal nailer up even with the surface of the built-up roof membrane. Set the cant strip in hot bitumen over these plies.

3.2.8.1.4. Install at least 4 plies of roofing felt set in hot bitumen in layer fashion. Set the first ply in hot bitumen flush with the top edge of the cant strip and extend it onto the roof surface at least 3 inches beyond the cut in the roof membrane. Install the three successive layers each one set even with the top edge of the cant strip and lapping over and extending onto the roof surface

3 inches beyond the underlying layer. Solid mop each layer into place in hot bitumen.

07 95 00 Maintenance and Repair

Page 18 of 26 Pages

April 2012

3.2.8.1.5. Install the base flashing sheet. Hold the top portion of the base flashing sheet even with or overlapping the vertical nailer and securely nail in place with roofing nails at a minimum of 8" O.C. Extend the base flashing sheet out onto the roof surface a minimum distance of 8 inches and set the base sheet in steep asphalt or flashing cement as recommended by the BURS

Manufacturer. Lap all vertical seams as recommended by the BURS

Manufacturer and securely seal them with steep asphalt or flashing cement as recommended by the BURS Manufacturer.

3.2.8.1.6. Fabricate and install the metal counter-flashing as shown on the plans. Include receiver in order that counter-flashing may be removed and reinstalled without removing the equipment from the curb.

3.2.8.1.7. Apply hot bitumen and aggregate surfacing as described above

(reference paragraph 3.2.1.1.1. and paragraph 3.2.1.1.2.).

3.2.8.2. Improper Or Improvised Equipment Curb (Pallet, Wood Blocking, Etc.):

3.2.8.2.1. Remove and dispose of the improper or improvised equipment curb and fabricated and install new equipment curb(s) as described in paragraph

3.2.8.1.

3.2.9. PROCEDURES FOR WOOD BLOCKING, NAILERS, DECKING, AND

MISCELLANEOUS WOOD USED IN BUILT-UP ROOFING: Repair of wood blocking or nailers will normally be required, when, in the course re-roof or of maintenance or repair of metal edge, metal fascia, pitch pans, expansion joints or other features where wood nailers are used, the contractor discovers the presence of deteriorated or rotten wood nailers. Unless structural failure has occurred, repair of wood decking will normally be required, when, in the course of a re-roof, the contractor discovers the presence of deteriorated or rotten decking. Repair of miscellaneous wood will normally be required, when, in the course of re-roof or maintenance or repair of metal fascia, gutter, or other features where miscellaneous wood is used, the contractor discovers the presence of deteriorated or rotten miscellaneous wood.

3.2.9.1. Wood Blocking or Nailers Deteriorated Or Rotten: Remove deteriorated or rotten wood blocking or nailers and provide and install new wood blocking or nailers in their place. Wood blocking and nailers are normally dimensional lumber.

New wood blocking and nailers shall match the width and thickness of the deteriorated wood blocking or nailers being replaced.

3.2.9.1.1. After deteriorated or rotten wood blocking and/or nailers have been replaced, complete the re-roof, repair, or maintenance action as described in the appropriate section dedicated to that action.

3.2.9.2. Wood Decking Deteriorated Or Rotten: Remove deteriorated or rotten wood decking and provide and install new wood decking in its place. Wood decking may be dimensional lumber, tongue and groove, or plywood. New wood decking shall match the thickness of the deteriorated wood decking being replaced.

New dimensional lumber decking or plywood decking shall always be installed in

07 95 00 Maintenance and Repair

Page 19 of 26 Pages

April 2012 not less than a two span condition (replacement piece supported in at least 3 places), and held tight against the decking to remain with no excessive gaps.