07412 Roof Replacement amendment 1.pdf

USDA FOREST SERVICE PROJECT SPECIFICATIONS

Amendment #1, Dated 2-10-2010

February 10, 2010 Prospect RS 6-ReRoofs 07412 - 1/5 Roof Replacement

SECTION 07412

1. PART 1 - GENERAL

ROOF REPLACEMENT

1.1 SUMMARY

A. This section specifies work related to removing and disposing of existing composition shingle roofing materials and the furnishing and installing of new preformed metal roofs complete with flashings, trim, and other related accessories (see Figures 1 thru 6), and lowering all raingutters.

Figure 1 – building #1052 Figure 2 – building #1053

Figure 3 – building #1054 Figure 4 – building #1055

Figure 5 – building #1058 (rear view) Figure – building #1072

February 10, 2010 Prospect RS 6-ReRoofs 07412 - 2/5

1.2 RELATED SECTIONS

A. 06100 Plywood Sheathing

1.3 SUBMITTALS

A. Manufacturer's catalog cuts and installation recommendations.

B. Samples: Furnish color samples from manufacturer’s full range of colors.

1.4 DELIVERY, STORAGE, AND HANDLING

A. Deliver, handle, and store preformed panels and other manufactured items in such a way that they will not be damaged, deformed, or stained.

B. Comply with manufacturer's recommendations for protection.

1.5 WARRANTY

A. The Contractor shall warrant for two years from substantial completion that the standing seam roofing is free from defective workmanship. While roofing is under warranty, repairs shall be performed at the Contractor’s expense.

B. Furnish roof manufacturer’s standard written warranty, and cleaning & maintenance guide.

2. PART 2 - PRODUCTS

2.1 ROOFING MATERIALS

A. Metal roofing

1. Shall be “Snap Lock” standing seam metal roofing with 1” vertical ribs at 12” o.c..

Panels manufactured by Bruce and Dana Inc., or approved equal, color “brown”.

2. Panels shall be 24 GA

3. Panels are to be full length, from ridge to eave on roof.

There shall be no exposed or penetrating fasteners except where needed for trim and flashings.

4. Finish: Polyvinyl fluoride (PVF2) 70% Kynar 500, Hylar 5000 resin coating 0.2 mil corrosion resistant primer. 0.8 mil PVF2 = 1.0 mil dry film thickness.

B. Accessories

a. Sheet metal flashings, trim, closure strips, caps and other similar sheet metal accessories used in conjunction with preformed metal panels shall be of the same material, finish, and manufacturer as used for the panels. All flashings shall work as a System with roof panels to provide weather proof seal.

b. Ridge, eave, and rake trim: Use Bruce and Dana, Inc. or approved equal C. Concealed fasteners

1. Ultra Z low profile pancake head. Electro Zinc - Carbon Steel fasteners. #12 x1 bugle screw for wood applications. Pan-head, 9/16” screws for eave overhangs.

D. Exposed fasteners

1. Electro Zinc - Carbon Steel, Painted Hex head with neoprene washer. #12 x 2 woodfast for wood applications.

E. Underlayment

1. 30 lb ASTM felt

February 10, 2010 Prospect RS 6-ReRoofs 07412 - 3/5

F. Roof pipe jacks

1. 26 gauge galvanized metal with rubber boot sized to fit pipe or conduit, color brown.

2. Rubber boot material to be appropriate for use on hot or on cold stack application.

G. Ridge Vents

1. Continuous ridge vent to be of same material and by same manufacturer as metal roofing, and to include insect screening.

3. PART 3 – EXECUTION

3.1 REMOVAL OF EXISTING ROOFING MATERIALS

A. Remove and dispose of all existing roof materials down to sheathing, including all trim, flashing, fasteners, felt, etc. All removed roofing materials shall become the property of the contractor and shall be removed from National Forest Land, in accordance with applicable federal, state, and local regulations.

3.2 DAMAGED ROOF SHEATHING

A. Install new sheathing in accordance with section 06100.

3.3 PREPARATION

A. Substrate to receive roofing shall be plumb and true, clean, even, smooth, as dry as possible and free from defects and projections, which might affect the installation.

Contractor must obtain written approval from CO for installed roof sheathing prior to installation of roofing materials.

3.4 UNDERLAYMENT

A. Install felt horizontal to eaves with minimum 2” overlap of each row. Provide ice dam protection for first 36” layer.

3.5 ROOF PANELS

A. Apply panel with the standing seam parallel to the slope of the roof. Provide panels in full lengths, with no transverse joints except at the junction or ventilators, curbs, translucent panels, and similar openings. Install flashing to assure positive water drainage away from penetrations. Flash and seal at the ridge, eaves, rakes, and adjoining vertical wall surfaces.

B. Closing off ridge line: All roofing panels terminating under a flashing: i.e.: ridge, clearstory, endwall, shall have the last 1” of the pan area bent up at a 90 degree angle.

This shall be accomplished by making a 1” cut in the pan as close to the vertical seam as possible. Then using the factory supplied endbender or equal, bend the entire 1”x12 pan area upward. Flexo seal or equal shall be used to seal both cut areas, causing a watertight pan.

C. Bend down metal roof bottom edge per manufacturer's recommendations and tools to direct water into gutters.

D. Provide minimum 1” fasteners: 2 at eave and 16” on center after that. Use 9/16” pan-head screws in overhangs at eaves; assure no penetration through eave sheathing.

3.6 ROOF PIPE JACKS

A. Install new rubber boots on all roof jack penetrations.

February 10, 2010 Prospect RS 6-ReRoofs 07412 - 4/5

B. Use heat-resistant material for contact with hot stack applications (building #1058 has two large diameter hot stacks, and two large diameter cool stacks).

3.7 FLASHING

A. All flashing and related accessories in connection with the preformed metal panels shall be provided as indicated and as necessary to provide a weather-tight installation.

B. Install eave flashing trim into gutters.

C. Provide inverted “vee” type cricket flashing on all roof penetrations greater than 3 feet from roof ridgeline D. Fastener spacing shall be in accordance with the panel manufacturer’s recommendations and as necessary to withstand the design loads indicated. Drive exposed penetrating type washers properly and drive so as not to damage factory applied coating. Exercise extreme care in drilling pilot holes for fastenings to keep drills perpendicular and centered. After drilling, remove metal filings and burrs from holes prior to installing fasteners. Fasteners shall not exceed that recommended by the manufacturer. Remove panels deformed or otherwise damaged by over-torqued fastenings, and provide new panels.

subject to damage from sliding snow loads.

E. Replace existing chimney crickets with new.

3.8 RIDGE VENTS

A. On roofs having existing individual square vents, replace with insect-screened continuous ridgeline venting.

3.9 RAINGUTTERS

A. Lower all raingutters approximately 4” to allow sliding snow to clear gutters.

3.10 CLEANING AND TOUCH UP

A. Clean all exposed sheet metal work at completion of installation. Remove metal shavings, filings, nails, bolts, and wires from roofs on completion to prevent discoloration and harm to the panels and flashings. Remove grease and oil film, excess sealant handling marks, contamination from steel wool, fittings and drilling debris and scrub the work clean. All exposed metal surfaces shall be free of dents, creases, scratch marks.

B. Clean all rain gutters and downspouts.

C. Use magnetic pick-up tool to clean minimum area to 10 foot from around building.

D. Touch-up all scraped or scratched areas with manufacturer’s supplied paint. Apply paint only to scraped or scratched areas of roof panels.

4. PART 4 - MEASUREMENT AND PAYMENT

4.1 METHOD OF MEASUREMENT

A. Measurement will not be made as items will be based on the design quantities or lump sum quantity as shown in the Schedule of Items.

February 10, 2010 Prospect RS 6-ReRoofs 07412 - 5/5

4.2 BASIS OF PAYMENT

A. Payment will be made under:

07412-1 Roof Removal, Building 1052 Square

PAY ITEM DESCRIPTION PAY UNIT

07412-2 Roof Replacement, Building 1052 Square

07412-3 Roof Removal, Building 1053 Square 07412-4 Roof Replacement, Building 1053 Square

07412-5 Roof Removal, Building 1054 Square 07412-6 Roof Replacement, Building 1054 Square

07412-7 Roof Removal, Building 1055 Square 07412-8 Roof Replacement, Building 1055 Square

07412-9 Roof Removal, Building 1058 Square 07412-10 Roof Replacement, Building 1058 Square

07412-11 Roof Removal, Building 1072 Square 07412-12 Roof Replacement, Building 1072 Square

07412-13 Lower All Raingutters Lump sum

END OF SECTION