Responses to RFI on FA8601-09-B-0006.pdf

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Responses to RFI on Solicitation FA8601-09-B-0006: Project ZHTV06-0009 (Replace Roof in Building 20005 – WPAFB)

1) Please note there are two (2) Metal Roof Sections, Section 07 41 13 and Section 07 61

14.00 20, Which are we to use?

Response: Use Section 07 61 14.00 20

2) In section 07 51 13 - BUILT-UP ASPHALT ROOFING; paragraph 1.8.1 Roof Membrane Manufacturer Warranty, it states " Furnish the roof membrane manufacturer's 20-year no dollar limit roof system warranty and....", all other references to the warranty indicate the warranty to be 20-year except GENERAL ROOFING NOTES #8, which states " Basis of design on the flat roof is a 25-year four ply built-up asphalt roof system...". I assume this was intended to say 20-year to match the other references.

Response: Provide a 20 year warranty.

3) On sheet A1.2 along the east wall the RD's refer to detail 10/A2, however on sheet A1.3 they refer to RD, with detail 3/A2. Note the RD at the matchline has different details for the same RD, are the roof drains in accordance with 10/A2 or 3/A2?

Response: They should be in accordance with 10/A2.

4) Detail 3/A2 indicates a RETRO FIT ROOF DRAIN DETAIL, detail 1/P1.4 indicates ROOF DRAIN REPLACEMENT. Are we to assume all the roof drains are to be replaced or are we installing new inserts?

Response: All drains are to be replaced.

5) On the Drawings, Page T001, GENERAL ROOFING NOTES, #28 states "All existing roof systems within the construction limits are to be removed to structure." However, #37 - Base Bid

- States "Roofing contractor to remove all loose flashings, field sheets, etc..". On sheet A1.1, A1.2 and A1.3, in the CODED NOTES, #2 it states " ...directly to the existing BUR on the concrete barrel vaults." Are we to lay over the existing roof as indicated in on the drawing notes or are we to remove the existing roof to the structure as indicated in note 28, Sheet T001?

Response: Contractor ro remove all existing roof systems to structure.

6) Which specification section is to be used for the roof panels, #07 41 13 or #07 61 14.00 20?

Response: Use Section 07 41 13

7) If #07 41 13 then the following is requested for clarification:

A. Can clarification be made on paragraph 1.7 as to the acceptance of jobsite roll formed panels?

Response: Field formed panels are not acceptable.

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B. Can clarification be made on paragraph 1.7 as to weatherseal of panel side joints.

Will factory applied mastic be acceptable?

Response: Yes.

C. Can clarification be made as to the inclusion of insulation in paragraph 1.8.1?

Response: Include the replacement of wet insulation in the warranty.

D. Can clarification be made to paragraph 2.1.1.b as to the inclusion of "AISI SG03-3" as this specification is for structural steel and not panels?

Response: Applies to any cold-formed metal shapes often used in conjunction with metal roofing.

E. Can clarification be made to paragraph 2.1.1.d as to which panel profile (i through x) is acceptable?

Response: 2” high stand seam rib at 16” o.c. with concealed stainless steel fasteners.

F. Can clarification be made to paragraph 2.2.c as to the designation of "+" 0.05 mils and 0.10 mils? Should this read "+ or -"?

Response: It should be a dash which indicates a range.

G. Can clarification be made to paragraph 2.2d the same as 2.2c?

Response: Yes

8) If #07 61 14.00 20 then the following is requested for clarification:

A. Are roof panels to be field seamed or snap lock?

Response: Field seamed.

B. Which design criteria is to be used for roof panels? 1.3.2 states for AISI SG03-3; 1.3.3 states ASTM E 1592 C. 1.3.2.1 Is the stated uplift of -6.24 psf correct? Is it correct for all roof zones?

Response: ASTM E1592 is to be used in the design of the panel. - 6.24 psf is a minimum.

Design and spacing of the clips holding down the roof are the manufacturer’s responsibility.

D. Does manufacturer's design of clip placement over ride the 30" maximum stated on detail 2/A10?

Response: Yes

E. Can requirement for Thermal Movement 1.3.2.3 be restated or edited for clarity?

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Response: System must be designed to accommodate temperatures from 10 degrees below 0°F to 180°F above 0.

F. Can clarification be made on 2.1 as to the height of the panel rib?

Response: 2”

G. Can clarification be made on 2.1.2 as to the texture of the panel?

Response: Smooth

H. Can clarification be made to paragraph 2.1.3 as to finish?

Response: Provide factory finish.

I. Assuming 2.1.3 is painted, is it the intent of paragraph 2.1.3.1 to specify a finish (Topcoat and primer) of 1.6 mils?

Response: Yes.

J. Can clarification be made to paragraph 2.1.3.1 as to the thickness and finish of the interior (backer) coat?

Response: .5 mil

9) Specification Section 07 42 13

A. Can paragraph 1.3 be edited to properly describe wall panel type required?

Response: Provide factory finished standing seam concealed fastening smooth metal panels.

B. Can paragraph 2.2.2 be edited to properly describe panel requirements?

Response: Provide 80 KSI and .05” panels.

C. Can clarification be made to paragraph 2.2.2.b as to the inclusion of "AISI SG03-3" as this specification is for structural steel and not panels?

Response: This section is included to cover any structural shapes provided as part of the metal roof system.

D. Can clarification be made to paragraph 2.2.2.d as to which panel profile (i through ix) is acceptable?

Response: 2” high standing seam at 16” o.c.

E. Can clarification be made to paragraph 2.2.3.3 as to the designation of "+" 0.05 mils and 0.10 mils? Should this read "+ or -"?

Response: It should be a dash.

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F. Same as 4E of this RFI in paragraph 2.2.3.4.

Response:

G. Can paragraph 2.2.3.5 be edited for color selection requirement?

Response: Selected by the contracting officer from the manufacturer’s standard colors.

10) Is it the intention that roof and wall panels to have the same:

A. Profile? No, but could be.

B. Gauge? Yes

C. Coating? Yes

D. Color? The color may vary from the roof panels.

If so, which specification, roof or wall, will govern the final selection of panel?

Response: Roof will govern.

11) The roof plans for option 2 built up roof call for 4 ply built up roof & gravel. The specs list 3 ply modified cap & gravel on page 12 of the roof weight summary. Please clarify.

Response: Provide four ply built up roof with base sheet and gravel.

12) What is the composition of the Option #1existing BUR flat roofs?

Response: Gravel over wood fiber insulation over rigid insulation over a base sheet.

13) Does the Option #1 flat roof areas have slope built in to the roof structure?

Response: The slope appears to be in the gypsum fill.

14) On the Option #1; how thick is the light weight concrete? Is the light weight concrete at just the drain saddles, or is it over the entire flat roof areas to provided slope to drains?

Response: It appears to be over the entire roof area. The fill appears to be approximately 4”.

15) Spec section 07 51 13 paragraph 2.13 references paver blocks; what are the surface bearing components to be supported? Is any walkway to be installed?

Response: The surface bearing components are for HVAC equipment supports. They are to be used only over the EPDM areas. Walkways are to be provided as per roof manufacturer requirements.

16) Spec section 07 53 23 paragraph 2.1.9.2 references ballast pavers and; 2.1.12.1 references precast concrete paver walkways. Where do these occur?

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Response: They do not apply.

17) What is the barrel roofs valley drain line existing taper insulation composition?

Response: It is wood fiber.

18) Is the existing roof membrane surface in the drain line valleys to be left intact with new taper insulation adhered on it?

Response: All roof system s are to be removed to structure.

19) The as designed drain taper saddles four-way slope will not function to direct water to drains when considering the drain location per detail 1/P1.4 Please clarify the barrel roof areas drain line taper design.

Response: The tapered insulation should come up to the edge of the drain as shown in detail 3/A5. The tapered insulation in the valleys should b made as thick as possible while still leaving 4” open at the through wall scuppers.

20) For the Option 1 flat roof replacement, is interior protection required? If it is, is the protection to be installed above lights near the deck underside or would draping on interior contents be acceptable.

Response: Protection of the interior of the building during construction is the responsibility of the contractor. Protection of the interior must not interfere with the functioning of the facilities daily operations or violate any building codes, base regulations or block egress.

21) Provided a dumpster does not impede vehicle and pedestrian traffic, can a dumpster by placed at the south and/or east edge of building?

Response: Specification section 01 74 19 states that a waste management plan shall be submitted wherein dumpster location shall be proposed. Every effort will be made to facilitate the proposed location.

22) Detail 7/A4 shows new wood blocking and taper insulation adhered to the concrete deck valley; whereas detail 6/A5 states “roofing contractor to remove all loose roofing membrane on parallel vaults and in the valley”. Please clarify if the existing roof system in the valleys is to be removed to the concrete deck. If not, is the new wood blocking at scuppers to be adhered to existing roof surface?

Response: The existing roof system is to be removed to structure.

23) Detail 6/A5 states “roofing contractor to remove all loose roofing membrane on parallel vaults and in the valley”. Loose membrane could be quantified during time allowed for site visit.

Is the information of loose membrane quantities available? If not, a unit price for this condition is appropriate. Please a unit price for this unknown condition.

Response: The existing roof system is to be removed to structure.

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24) General Note 36 on Sheet T001 - Has the Air force tested the existing roof for asbestos?

The way this note reads we have to assume the existing roof and flashings contain asbestos which will greatly increase the cost of demolition.

Response: Yes, see asbestos report.

25) Addendum No. 1 is not clear on what is required to renovate 2 clerestory skylight/doghouses and to restore 2 others. Could you please provide further detailed explanation as to what is required as far as restoration and renovation of these four units?

Response: Addendum No. 1 was just specifying which two (2) clerestory skylight/doghouses were to be renovated and which two (2) shall be restored. The description of work can be found in the General Roofing Notes, Option #4 and #5.

26) Will interior protection be required for the entire project?

Response: Yes

Need to know what the slope is 1/8", 1/4", or 1/2" per foot for the taper insulation it only gives us 2" min. to start with & 1/2" overlay board. We will also need the slope for the saddles & crickets.

Response: On the built up roof areas the roof slope should be ¼” per foot. The slope for crickets and saddles should be ½” per foot.

27) Please verify scope of work required:

a. Sheet T001 - GENERAL ROOFING NOTE # 26. Roofing contractor to remove & reinstall lightning protection.

b. Detail 1 on Sheet A-3 - LIGHTNING ROD DETAIL

c. 1.6.1 Warranty Management Plan

b. Listing and status of delivery of all Certificates of Warranty for extended warranty items, to include roofs, … , lightning protection systems, etc

e. SECTION 01 78 00 Page 7

3.3.5.5 Lightning Protection

Flash or attach lightning protection system components to the roof membrane in a manner acceptable to the roof membrane manufacturer.

f. SECTION 07 51 13 Page 17

3.4.2 Lightning Protection

Flash lightning protection system components or attach to the roof membrane in a manner acceptable to the roof membrane manufacturer.

g. SECTION 07 53 23 Page 16

1.6.1 Warranty Management Plan

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h. Listing and status of delivery of all Certificates of Warranty for extended warranty items, to include roofs, …, lightning protection systems, etc.

Response: Yes, recertify existing lightning protection system.

28) I believe this building does not have any lightning protection on it at this time.

Are we to figure a complete new lightning protection system?

Response: No. Remove and reinstall existing lightning protection system and recertify.

29) There is a conflict between the General Notes on Sheet T001 and the Coded Notes on Sheet

A1.1. General note No. 28 on Sheet T001 states: "All existing roof systems within the construction limits are to be removed to the structure." Coded Note No. 2 on Sheet A1.1 states:

"Provide 115mil fleeceback EPDM roof system membrane adhered using low rise polyurethane adhesive directly to the existing BUR on the concrete barrel vault." Which note is the correct one? Are we removing the existing roof on the barrel vaults or are we adhering the EPDM to the existing roof membrane?

Response: All existing roofs are to be removed to structure.

30)

a. Are units that are slated to be demolished previously disconnected and refrigerant abated? If not, is contractor to disconnect utility service(s) and abate refrigerant?

Response: Unknown. Assume that the units are still connected and that the refrigerant needs abated. Contractor shall perform work.

b. Please clarify on sheets A1.1-2-3; detail 3/A2 Retrofit Drains is called out for drains shown in barrel roof valleys; whereas sheets P1.1-2-3 show same drains as replaced.

Response: Drains are to be replaced.

c. Line 28 on the cover page calls for all roofs to be torn off the coded notes #2 tell us to go over all the barrel vaulted roofs which is it

Response: All existing roofs are to be removed to structure.

d. Detail 1 page A5 is noted on page A1.2 as typical. Using this detail would direct the contractor to replace the trusses, sheathing, and roofing system at every doghouse. Is this the architect’s intent? Please advise.

Response: Look at options on page T001 for application of detail.