RFIs 1_ 42 VA Reroofs 501_149_100 _ Addendum 01.pdf

Solicitation 36C26223B0007 Replace Roofs on Campus, ABQ Page 1 of 10 Addendum #1

Bidder Questions

1. Please provide as-built documentation for the solar array on building 45

Response: See attached As-Built Documents for VA Photovoltaic System. Reference Site 2 for Bldg. 45 on attached As Built Drawings

2. Please provide weights of existing mechanical air handler/unit on Bldg 8.

Response: 1ST UNIT MOD # - YSCO48A3RHA2VD0000 NET WEIGHT = 505LBS

2ND UNIT MOD # YSC090F3ELA1V0000 NET WIGHT = 780 LBS

Weights and dimensions provided are approximate. Contractor must field verify all dimensions.

3. Please provide duct sizes for new ducts on Bldg 8

Response: 1ST UNIT MOD # - YSCO48A3RHA2VD0000

DUCT SIZE FOR THIS UNIT (SUPPLY) - 17”X13 ½” – (RTN) - 23”X13 ½”

2ND UNIT MOD # YSC090F3ELA1V0000

DUCT SIZE FOR THIS UNIT (SUPPLY) - 17”X32 ½” – (RTN) - 20”X24”

Weights and dimensions provided are approximate. Contractor must field verify all dimensions.

4. Page 26 41 00 – 2, Part 2.1.A, calls for the exclusion of any aluminum materials. Provided lightning protection design drawings call for the use of aluminum materials as does industry standards given the use of sheet metal flashing in the roof design. Please clarify.

Response: Aluminum is to be used per lightning protection designer.

5. Page 26 41 00 – 2, Part 2.8, calls for down conductor guards: Stiff copper or brass. Please clearly define as industry standards for down conductor guards utilize PVC or rigid conduit.

Response: Per lightning protection designer, industry standard is to use 1” or 1.25” schedule 40 PVC conduit. If you have any bends in the conduit. You have to use 1.25” conduit as it meets the 8” bend radius requirement.

6. Warranty Period conflict- Which warranty period prevails?

Spec section- 0754-23 TPO Bidder Rep -1.4 A 20-Year NDL

Submittal -1.6K 20-year NDL

Warranty -1.11B 30-year NDL

Response: 30 Year No Dollar Limit Warranty is required. Specification section 07 54 23 has been revised and reissued in this addendum.

7. Key Note Clarification- Certain Roof section assemblies lack reference numbers.

Bld 1 West Sections N, O, P, and R lack assembly reference. Please clarify

Bldg 45 Sections D, and E lack assembly reference. Please clarify

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Response: Drawing sheets AD101 & A101 for Bldg 1 & drawing sheets AD101 & A101 for Bldg 45 have been revised and reissued in this addendum.

Regarding Bldg 1:

1. Refer to Sheet AD101, add the following to Roof Area N: demo keynotes N, V.

2. Refer to sheet A101, add the following to each Roof Area O, P, & R: sheet keynotes 1, 6, & 9.

Regarding Bldg 45:

1. Refer to sheet AD101, add the following to Roof Areas D & E: demo keynotes B, E.

2. Refer to sheet A101, add the following to Roof Areas D & E: sheet keynotes 1, 1B.

8. In the course of construction will it be acceptable for a night shift tear-off crew and a daytime layup crew for roofing?

Response: No, VA will need VA Shop personnel on station.

9. On Building 1 is it acceptable for off-hours/weekend load and unload with a crane from the front of the building?

Response: Yes for scheduled off-hour weekend load and unload only, will need to operate crane from south side parking lot and perform blind lifts.

10. Who is the manufacturer of the existing solar panel system on Building 45?

a. Is there a service contract or warranty still active?

b. Who services it?

Response: Manufacturer is SUNPOWER. No service contract in place. VA Electric Shop has serviced on occasion but not to the extent required due to non-trained staff.

11. Does all rooftop equipment (fans, ventilators, penthouses, ahu’s, etc.) get refurbished/repainted?

Response: No, unless specified in construction document.

12. Can we get the full hazardous building materials inspection report associated with this project? (It will show exactly where the asbestos roofing/flashing is located along with where the lead is located, as well as the lead content, which will make a difference in disposal costs.)

Response: The solicitation includes ACM Test Report of material that were detected to contain ACM. Spec Section 02 82 13.21 Asbestos Roofing Abatement; 1.1.2 and 1.2 identifies estimated (+/- 5%) in quantities of material for Bldg’s. 1, 8, 14, & 11. Along with and a number of tests for perform ACM Testing to verify material content of ACM prior to demolition.

There were no Lead Testing performed.

Perform work in accordance with Spec Section 02 83 33.13 and provide 32 Lead Tests of materials to report the location and material to be abated. Contractor shall bid on abating 2500 LB of hole component removal of lead-contaminated materials. No Lead Paint removal is expected and if needed, will be an added cost to the government. Any material exceeding 2500 LD will be an added cost to the government.

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13. Keynote 1 for Bldg. 46 calls out for new ½” FR Plywood mechanically attached to metal decking prior to installation of the new TPO roofing and insulation per Detail C2/A101. The FR plywood is also listed in Section 07 54-23, Page 15 under D. Job Requirements, Item A. New Roof Assembly, Sub-Item’s 5 and 7D. As this is an atypical installation, is the plywood to be installed over the entire metal deck and if so, do we install with a standard fastening pattern of 6” – 8” at perimeter of plywood sheet and secure every 16” or 24” o.c. with a row of screws fastened 6”-8” o.c. into underlying steel deck? The alternative is to treat the sheets of plywood as a layer of insulation and secure to meet the recommended fastening pattern. Will clips be required where the plywood seams are not supported completely by the metal decking? Note most single ply roofing manufacturer’s do not address plywood over steel decking. Thank you.

Response: Keynote 1 for Bldg. 46 lists ½” FR plywood in error. Drawing sheet keynote and specifications have been revised to remove reference. Drawing sheet A101 for Bldg 46 has been revised and reissued in this addendum.

14. Please provide a complete hazardous materials survey for this project that included asbestos and lead abatement quantities and locations.

Response: See Response to Question 12 for reference to answer.

15. Would like to see if we can schedule a couple of days to inspect all roof levels. Many of the existing roofs appear to hold a lot of water and may require additional tapered insulation. we would like the opportunity to spike the various roofs for depths both at low and high points. We will also have levels to determine the existing slope. All locations of spike’s will be cleaned and repaired before we leave site. I am not sure if we set this up through you or try to d so directly with the VA engineering department.

Response: Contracting Officer will schedule one day for additional site visit, but no destructive testing will be allowed. Any potential differing site conditions will be addressed during contract performance.

16. We would like to request a 2nd site visit to be scheduled to allow all interested roofing contractors to attend and be allowed to spike the various roofs for depths both at low and high points, as well as determine the existing slope. All locations of spike’s will be cleaned and repaired before we leave site.

Response: See Response to Question 15 for reference to answer.

17. A formal site visit is requested in lieu of independent scheduling with the engineering dept so that all contractors have the opportunity to witness the sampling. This is critical as the specification is clear that no additional remuneration will be provided for items that could have been ascertained prior bid (reference General Notes 6 and 18). Please allow sufficient time from the 2nd site visit for contractors to process this information before the bid due date.

Response: See Response to Question 15 for reference to answer.

18. Are As-Builts available to confirm existing slope in roof structures for all 7 buildings? Please provide as built plans.

Response: No as-builts are available.

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19. Does the VA wish to save any existing concrete pavers that are not cracked or damaged? If salvaged, what does the VA wish to be done with these items?

Response: Yes. All good pavers will go to the grounds shop.

20. There is roughly 110 tons of smooth rock ballast on Bldg. 46 to be removed. Does the VA wish to retain any of this material? If salvaged, what does the VA wish to be done with these items?

Response: No, contractor required to remove in accordance to Spec Section 01 74 19 Construction Waste Management as required.

21. Both 20 year and 30 year roofing manufacturer NDL Labor & Material warranties are listed in the specification, please clarify which will be required.

Response: 30 Year No Dollar Limit Warranty is required. Specification sections 07 54 23 (All Buildings) have been revised and reissued in this addendum.

22. Section 07 54 34, Page 11, 2.5 Membrane Accessory Materials, Item A calls out 60 mil flashing thickness.

Section 07 54 23, Page 15, D. Job Requirements, A. New Roof Assembly, Item 2 calls out 80 mil baseflashing thickness. Which is the correct requirement?

Response: 60 mil flashing thickness is required. Specification sections 07 54 23 (All Building) have been revised and reissued in this addendum.

23. A review of Section 01 00 00 appears to indicate that Buildings 1, 8, 11, and 14 are to receive an 80 mil Fleeceback roofing membrane while Buildings 39, 45, and 46 are to receive an 80 mil standard/bareback membrane. Please confirm which requirement is correct as this will affect cost.

Response: All buildings will require 80 mil fleeceback roofing membrane. Specification section 01 00 00 has been revised and reissued in this addendum.

24. Is the specified 80 mil membrane to be a “minimum” 80 mils thick or a “nominal” 80 mils thick?

Response: Nominal 80 mils thick.

25. Section 01 00 00 references the use of Rhino Bond plates for Buildings 39, 45, and 46. Are Buildings 39, 45, and 46 to receive a Rhino-Bond, mechanically-fastened roof assembly?

Response: There is no induction welding on this job. Reference to Rhino Bond plates should be eliminated. Specification section 01 00 00 has been revised and reissued in this addendum.

26. Are the existing skylights at Building 46 to be reused or replaced with new? If new, please provide a specification section for the skylights.

Response: Existing skylights are to remain, except for those indicated for removal per Demo Keynote J, sheet AD101. Existing skylight curbs are to be raised, as required, to meet 12” height requirement.

27. If existing skylights are to be reused, can the name of the original skylight manufacturer be provided as they may already have a curb designed to fit that lens?

Response: No manufacturer can be provided.

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28. Specifications call for existing roof drains to be replaced with an option for installing new, TPO coated drain inserts. Drain inserts reduce the size of existing drain openings and in certain conditions reduce the ability of the existing drain assembly to quickly and adequately remove water from the roof area. As many of the roof drains at the historic buildings appear to be fairly small, is there a break point at which the use of drain inserts is recommended, ie: 4” and larger drain lines are acceptable for installation of a drain insert while lines under 4” in diameter would need to be replaced?

Response: Yes, 4” break point, as described above, is acceptable.

29. Demolition Keynotes indicate that metal roof decks are to be scoured with a wire brush to remove rust and coated with a rust inhibitive primer. Are we to include cost to scour and prime the “entire” roof deck, or is there a percentage of deck area to include with a unit cost option for additional area’s? if the entire deck is treated it will add substantial cost to the project.

Response: Entire roof deck is required.

30. Are new overflow scuppers to match the dimensions of the existing overflow scuppers through the parapet walls?

Response: Yes

31. If the combination of increased roof insulation and tapered insulation crickets exceeds the height of the existing overflow scupper, do we abandon the original scupper and core in a new one? This primarily occurs at Building 1, Roof E where the overflows are located between the two roof drains.

Response: Yes

32. Does the east entry canopy of Bldg. 14 require an average R-30 tapered insulation as it is not over conditioned space? The additional insulation thickness may push the TPO flashings up into the existing “vigas”.

Response: Canopy Roof Area C does not need tapered insulation.

33. Davis Bacon Wage Decision does not have a “Roofer” wage rate posted. Can one be provided by the DOL prior to bid date?

Response: Contractors are responsible for determining the appropriate staffing necessary to perform the contract as well as complying with the minimum wage and benefits required for each classification performing work on the contract. Contractors shall select and apply the comparable “skilled” classification from the existing wage rate provided in the solicitation.

34. Are the replacement canales for the historical buildings 1, 8, 11, and 14 intended to have the same look/design? Currently they are mostly 20” long, 4” wide, and 4” tall with some variation of a box design versus a ½ moon traditional curve.

Response: Yes, The Canales should have the same look for historical purposes and submitted to

NM SHPO

35. Sheet G001 does not list all of the plans in the set. Please provide a revised coversheet plan that lists all of the plan sheets.

Response: Each building has a coversheet G001 listing all included sheets for each building set.

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36. We need as builts for the power one line and panel schedules for all buildings to determine where to do our lockout tagout.

Response: It is the Contractor’s responsibility to field verify all existing conditions. An additional site visit opportunity has been scheduled. Refer to Amendment 0001 36C26223B0007.

37. General sheet note 4 on plan AD101 says the contractor is to support pipes 2” and smaller at the spacings listed. Is the VA asking for the contractor verify ALL existing piping a and to re-support the piping as part of this project? It is not possible to do an extensive survey of this scope prior to bidding. Please provide a quantity of pipe supports to be used as an allowance for bidding purposes.

Response: This general note applies to all piping supports on roofs to be replaced. It is the Contractor’s responsibility to field verify all existing conditions.

38. Will workers be allowed access/egress to the roof areas from inside the buildings?

Response: Only through existing stairwells and roof hatches with frequency approved by COR.

39. Will temporary heating or cooling be required as part of this project?

Response: Yes, for occupied buildings that require removal of any portion of HVAC System.

40. Please confirm that the general contractor is only responsible for a 1 year warranty and that any other roofing warranties listed in this solicitation will be the responsibility of the manufacturer.

Response: The other roofing warranties are the Contractor’s responsibility to obtain from the roofing manufacturer.

41. General sheet note #20 on plan AD101 states that the contractor is to conduct necessary tests to verify that the HVAC units are functional. This project scope only requires that the curbs be raised.

Please confirm that the existing equipment is functional and that the contractor is not responsible to test or repair any existing HVAC equipment and also that he contractor will only be responsible for equipment repairs in the event that they damage the equipment in the removal and reinstallation scope.

Response: All abandoned/non-working equipment should be inspected, identified and anotated by the Owner in the presence of the contractor. It is the Contractor’s responsibility to repair any damage to equipment that occurs during the removal and reinstallation process to raise curbs and install new roofing membrane.

42. General sheet note #24 on plan AD101 says that the contractor is to provide and inventory of all nonworking and abandoned mechanical equipment, supply lines, damaged tiles, sidewalks and other building components that could be affected by roofing process. All abandoned items shall be removed.

This is a broad requirement. We are unable to know what equipment is abandoned and needs removal for bidding purposes.

Response: All abandoned/non-working equipment will be surveyed annotated by the Owner in the presence of the contractor.

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The following changes shall be made to the drawings and specifications:

Specifications

A. Specification Manual has been REISSUED. Specification Section 01 00 00 General Requirements and Section 07 54 23 Thermoplastic Polyolefin (TPO) Roofing (All Buildings) have been REVISED as follows:

1. Refer to Section 01 00 00, Page 9, Part E - Building #39, Part 3, Roof Areas A & B, revise Items 1-3, as follows:

“1) 80 mil TPO fleeceback membrane to be fully adhered to ½” HD coverboard with bonding adhesive.

2) 1/2” HD coverboard to be foam adhered with manufacturer approved and uplift tested foam adhesive to new min. 2 layers of Polyisocyanurate insulation equaling R-30.

3) First layer of insulation is to be mechanically fastened thru the existing lightweight concrete and metal deck. All remaining insulation layers are to be foam adhered.”

2. Refer to Section 01 00 00, Page 9, Part E - Building #39, Part 3, Roof Area C, revise Items 1-3, as follows:

“1) 80 mil TPO fleeceback membrane to be fully adhered to ½” HD coverboard with bonding adhesive.

2) 1/2” HD coverboard to be foam adhered with manufacturer approved and uplift tested foam adhesive to new min. 2 layers of Polyisocyanurate insulation equaling R-30.

3) First layer of insulation is to be mechanically fastened thru new layer of ½” fire treated plywood that has been mechanically fastened to the existing wood deck. All remaining insulation layers are to be foam adhered.”

3. Refer to Section 01 00 00, Page 11, Part F - Building #45, Item 4, revise items 1-4 as follows:

“1) 80 mil TPO fleeceback membrane to be fully adhered to ½” HD coverboard with bonding adhesive.

2) 1/2” HD coverboard to be foam adhered with manufacturer approved and uplift tested foam adhesive to new ¼”/FT tapered Polyisocyanurate insulation with a 1 ½” start with an average R-30.

3) First layer of insulation is to be mechanically fastened to the existing metal deck. All remaining insulation layers are to be foam adhered.

4) On the swimming pool, Roof Area B, all layers of insulation to be foam adhered to new peel & stick vapor barrier that has been adhered over new 1/2” HD coverboard that has been mechanically attached with 410 stainless screws to the existing metal deck. Vapor barrier shall not be penetrated. Items 1 & 2 above assembly will be installed.”

4. Refer to Section 01 00 00, Page 12, Part G - Building #46, Item 3, revise items 1-3 as follows:

“1) 80 mil TPO fleeceback membrane to be fully adhered to ½” HD coverboard with bonding adhesive.

2) 1/2” HD coverboard to be foam adhered with manufacturer approved and uplift tested foam adhesive to new min. 2 layers of Polyisocyanurate insulation equaling R-30.

3) First layer of insulation is to be mechanically fastened to the existing metal deck. All remaining insulation layers are to be foam adhered.”

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5. Refer to Section 07 54 23 (All Buildings), Page 2, Part 1.4.A, second sentence, replace `20-year’ with `30-year’.

6. Refer to Section 07 54 23 (All Buildings), Page 6, Part 1.6.K, replace `20-year’ with `30-year’.

7. Refer to Section 07 54 23 (All Buildings), Page 11, Part 2.5, revise item A as follows:

“A. Flashing: 60 mil reinforced TPO membrane curb and wall flashing. For Field fabricated vents stacks, pipes and corners provide unreinforced 60 uncured white TPO.”

8. Refer to Section 07 54 23 (Building #1), Page 15, Part 2.7.D.1.a, revise item 2 as follows:

“2) 60 mil bareback TPO baseflashings”

9. Refer to Section 07 54 23 (Building #1), Page 16, Part 2.7.D.2.a, revise items 1 & 2 as follows:

“1) 80 MIL fleeceback TPO field membrane

2) 60 mil bareback TPO baseflashings”

10. Refer to Section 07 54 23 (Building #1), Page 16, Part 2.7.D.3.a, revise item 1 as follows:

“1) 80 MIL fleeceback TPO field membrane and 60 mil bareback TPO baseflashings”

11. Refer to Section 07 54 23 (Building #8), Page 15, Part 2.7.D.1.a, revise item 2 as follows:

12. Refer to Section 07 54 23 (Building #8), Page 16, Part 2.7.D.2.a, revise items 1 & 2 as follows:

13. Refer to Section 07 54 23 (Building #11), Page 15, Part 2.7.D.1.a, revise item 2 as follows:

14. Refer to Section 07 54 23 (Building #11), Page 16, Part 2.7.D.2.a, revise items 1 & 2 as follows:

15. Refer to Section 07 54 23 (Building #11), Page 16, Part 2.7.D.3.a, revise item 1 as follows:

16. Refer to Section 07 54 23 (Building #14), Page 15, Part 2.7.D.1.a, revise item 1 as follows:

17. Refer to Section 07 54 23 (Building #39), Page 15, Part 2.7.D.1.a, revise items 1 & 2 as follows:

18. Refer to Section 07 54 23 (Building #39), Page 16, Part 2.7.D.2.a, revise item 1 as follows:

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19. Refer to Section 07 54 23 (Building #45), Page 15, Part 2.7.D.2.a, revise items 1 & 2 as follows:

20. Refer to Section 07 54 23 (Building #45), Page 16, Part 2.7.D.3.a, revise items 1, 2 & 8.d as follows:

“1) 80 MIL fleeceback TPO field membrane

2) 60 mil bareback TPO baseflashings 8.d) All layers of Polyisocyanurate insulation to be foam adhered to new peel & stick membrane that has been adhered over new 1/2” HD coverboard that has been mechanically attached with 410 stainless screws to the metal deck.”

21. Refer to Section 07 54 23 (Building #46), Page 15, Part 2.7.D.1.a, delete item ‘5’ in it’s entirety, and revise items 1, 2 & 7.d as follows:

“1) 80 MIL fleeceback TPO field membrane

2) 60 mil bareback TPO baseflashings 7.d) First layer of Polyisocyanurate insulation to be mechanically fastened thru the metal deck. All remaining layers of insulation to be foam adhered.”

Drawings

A. Individual Drawing Sheets have been REVISED and REISSUED for Building #1 (sheets AD101, A101), Building #45 (sheets AD101, A101), and Building #46 (A101) drawing sets, and include the following revisions:

1. Refer to Bldg 1 drawing set, Sheet AD101, add the following to Roof Area N: demo keynotes N, V.

2. Refer to Bldg 1 drawing set, Sheet A101, add the following to each Roof Area O, P, N, & R: sheet keynotes 1, 6, & 9.

3. Refer to Bldg 45 drawing set, sheet AD101, add the following to each Roof Area D & E: demo keynotes B, E.

4. Refer to Bldg 45 drawing set, sheet A101, add the following to each Roof Area D & E: sheet keynotes 1, 1B.

5. Refer to Bldg. 45 drawings set, sheet A101, revise keynote 1A as follows:

“1A. NEW ROOF ASSEMBLY – ROOF AREA B: FULLY ADHERED TPO MEMBRANE TO ½” HIGH

DENSITY COVERBOARD WITH BONDING ADHESIVE. ½” HD COVERBOARD TO BE FOAM

ADHERED WITH MANUFACTURER APPROVED AND UPLIFT TESTED FOAM ADHESIVE TO NEW

¼”/FT TAPERED POLYISOCYANURATE INSULATION WITH A 1 ½” START MINIMUM WITH AN

AVERAGE R-30. ALL LAYERS OF INSULATION TO BE FOAM ADHERED TO NEW PEEL & STICK

VAPOR BARRIER THAT HAS BEEN ADHERED OVER NEW ½” HD COVERBOARD THAT HAS BEEN

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MECHANICALLY ATTACHED WITH 410 STAINLESS SCREWS TO THE EXISTING METAL DECK. SEE

DETAIL E3/A101.”

6. Refer to Bldg 46 drawing set, sheet A101, revise keynote 1as follows:

“1. NEW ROOF ASSEMBLY: FULLY ADHERE 80 MIL TPO MEMBRANE TO ½” HIGH DENSITY

COVERBOARD WITH BONDING ADHESIVE. ½” HD COVERBOARD TO BE FOAM ADHERED WITH

MANUFACTURER APPROVED AND UPLIFT TESTED FOAM ADHESIVE TO NEW MIN. 2 LAYERS

POLYISOCYANURATE INSULATION EQUALING R-30. FIRST LAYER OF INSULATION IS TO BE

MECHANICALLY FASTENED TO THE EXISTING METAL DECK. ALL REMAINING INSULATION

LAYERS ARE TO BE FOAM ADHERED. SEE DETAIL C2/A101.”

End of Addendum #1