36C25520R0060-0003000.docx

5. PROJECT NUMBER (if applicable)

CODE

7. ADMINISTERED BY

2. AMENDMENT/MODIFICATION NUMBER

CODE

6. ISSUED BY

8. NAME AND ADDRESS OF CONTRACTOR

4. REQUISITION/PURCHASE REQ. NUMBER

3. EFFECTIVE DATE

9A. AMENDMENT OF SOLICITATION NUMBER

9B. DATED

PAGE OF PAGES

10A. MODIFICATION OF CONTRACT/ORDER NUMBER

10B. DATED

BPA NO.

1. CONTRACT ID CODE

FACILITY CODE

CODE

Offers must acknowledge receipt of this amendment prior to the hour and date specified in the solicitation or as amended, by one of the following methods:

The above numbered solicitation is amended as set forth in Item 14. The hour and date specified for receipt of Offers

E. IMPORTANT:

is extended,

(a) By completing Items 8 and 15, and returning __________ copies of the amendment; (b) By acknowledging receipt of this amendment on each copy of the offer submitted; or (c) By separate letter or electronic communication which includes a reference to the solicitation and amendment numbers. FAILURE OF YOUR ACKNOWLEDGMENT TO BE RECEIVED AT THE PLACE DESIGNATED FOR THE RECEIPT OF OFFERS PRIOR TO THE HOUR AND DATE SPECIFIED MAY is not extended.

12. ACCOUNTING AND APPROPRIATION DATA

(REV. 11/2016)

is required to sign this document and return ___________ copies to the issuing office.

is not, A. THIS CHANGE ORDER IS ISSUED PURSUANT TO: (Specify authority) THE CHANGES SET FORTH IN ITEM 14 ARE MADE IN THE CONTRACT ORDER NO. IN ITEM 10A.

15C. DATE SIGNED

B. THE ABOVE NUMBERED CONTRACT/ORDER IS MODIFIED TO REFLECT THE ADMINISTRATIVE CHANGES SET FORTH IN ITEM 14, PURSUANT TO THE AUTHORITY OF FAR 43.103(b).

RESULT IN REJECTION OF YOUR OFFER. If by virtue of this amendment you desire to change an offer already submitted, such change may be made by letter or electronic communication, provided each letter or electronic communication makes reference to the solicitation and this amendment, and is received prior to the opening hour and date specified.

C. THIS SUPPLEMENTAL AGREEMENT IS ENTERED INTO PURSUANT TO AUTHORITY OF:

D. OTHER

Contractor

16C. DATE SIGNED

14. DESCRIPTION OF AMENDMENT/MODIFICATION

16B. UNITED STATES OF AMERICA

Except as provided herein, all terms and conditions of the document referenced in Item 9A or 10A, as heretofore changed, remains unchanged and in full force and effect.

15A. NAME AND TITLE OF SIGNER

16A. NAME AND TITLE OF CONTRACTING OFFICER

15B. CONTRACTOR/OFFEROR

STANDARD FORM 30

PREVIOUS EDITION NOT USABLE

Prescribed by GSA - FAR (48 CFR) 53.243 (Type or print) (Type or print) (Organized by UCF section headings, including solicitation/contract subject matter where feasible.)

(Number, street, county, State and ZIP Code) (If other than Item 6) (Specify type of modification and authority) (such as changes in paying office, appropriation date, etc.)

(If required)

(SEE ITEM 11)

(SEE ITEM 13)

(X)

CHECK

ONE

13. THIS ITEM APPLIES ONLY TO MODIFICATIONS OF CONTRACTS/ORDERS,

IT MODIFIES THE CONTRACT/ORDER NO. AS DESCRIBED IN ITEM 14.

11. THIS ITEM ONLY APPLIES TO AMENDMENTS OF SOLICITATIONS

AMENDMENT OF SOLICITATION/MODIFICATION OF CONTRACT

(Signature of person authorized to sign) (Signature of Contracting Officer) 05-01-2020 589A4-19-101 36C255 Department of Veterans Affairs Network Contracting Office (NCO) 15 3450 S 4th Street Trafficway Leavenworth

KS

66048 36C255 Department of Veterans Affairs Network Contracting Office (NCO) 15 3450 S 4th Street Trafficway Leavenworth

KS

66048 To all Offerors/Bidders

36C25520R0060 05-01-2020

X x x

May 13, 2020 by 2:00 pm CDT Replace Roofs building 1 & 23

This amendment provides additional questions and answers.

CONTINUATION PAGE

ADDENDUM NO: 1

According to contract documents dated: 02-27-2019

NOTICE TO CONTRACTORS

Contractors bidding on the above described work are hereby notified that the Contract Documents, pursuant to which the work is to be done, have been amended per the attached information.

INDICATE RECEIPT OF ADDENDUM IN LOCATION PROVIDED ON BID FORM.

Addendum Fo x A rc h i te c ts fox-arch.com 1 Memorial Drive

Suite t 621 4343 St. Louis, MO 63102-2448

USA

f

621 0261

Addendum

Fo x A rc h i te c ts fox-arch.com 1 Memorial Drive

Suite

621 4343 St. Louis, MO 63102

Page 1 of Pre-Bid RFI, statements and resulting drawing addendum:

RFI-01

Specification 07 53 23-6 2.4 EPDM Roofing Membrane. It is listed as a fabric backed membrane however the ASTM number is pointing us to a reinforced EPDM. Can you please specify if they are wanting a fabric backed EPDM or a reinforced membrane?

Answer The existing membrane on BLDG 23 is non-reinforced white EPDM. Non reinforced EPDM is acceptable. Contractor to provide an EPDM Type I - non reinforced, White in 60 mils.

RFI-02

Specification 07 53 23-6 2.4 . It is referencing Fire Resistant membrane. Firestone does not manufacturer a reinforced white Fire Resistant Membrane. Please clarify if this is a requirement.

Answer Fire Resistant Membrane is required, but the reinforced membrane is not. Contractor to provide a Class A material as specified but does not need to be a Reinforced Membrane. See RFI 1 above. This is contrary to what was stated in the pre-bid conference today. This RFI answer supersedes that statement.

RFI-03

Details on sheet A1.1 denote a range of different roof construction types. What is the roof assemble for Bldg 23.

Answer Building 23 is metal decking over steel. Not a composite or concrete slab roof.

RFI-04

Is Bldg 23 a partial roof tear off or full tear off down to deck.

Answer Building 23 is a full tear off down to existing metal deck. The Roof structure does not slope. New tamper insulation used, see RFI-05 below.

FRI-05

The existing roof and/or new roof slopes are not noted nor are the existing roof drain locations to calculate the tapered insulation slope.

Answer See existing roof drain locations are denoted by RD and tapered insulation roof slope is at 1/4” / 1’-0” slope. See image below; Revised Plan 6/A1.1.

End of RFI’s to date, 04-14-20.

ADDENDUM NO: 2

According to contract documents dated: 02-27-2019

NOTICE TO CONTRACTORS

Contractors bidding on the above described work are hereby notified that the Contract Documents, pursuant to which the work is to be done, have been amended per the attached information.

INDICATE RECEIPT OF ADDENDUM IN LOCATION PROVIDED ON BID FORM.

Addendum Fo x A rc h i te c ts fox-arch.com 1 Memorial Drive

Suite

621 4343 St. Louis, MO 63102-2448

Addendum

Fo x A rc h i te c ts fox-arch.com 1 Memorial Drive

Suite

621 4343 St. Louis, MO 63102

Page 1 of VA Columbia Roof Replacement Building 1 & 23 RFI’s.

RFI-06

6.1 What is the basis of design for this roof?

Answer There is no manufactured basis of design. This is an open manufacture bid. See Drawings and Specifications as clarified below in this Addendum No. 2.

6.2 Please advise if we are to include the following:

1. Based on Addendum #2 response it would appear a 60 mil fully adhered white EPDM membrane is required?

Answer Yes, a 60 mil fully adhered white EPDM membrane is specified.

1. A substrate board on the metal deck (not shown in details)?

Answer A substrate board is not required on the metal decking, if the GC elects to provide a substrate board for job site safety use as specified. But again not required.

RFI-06 (6.2 Continued)

1. A vapor barrier on the substrate board (not shown in details)? If so, do we included the poly as referenced in the roof spec or the 40 mil SA vapor barrier as manufactured by roof manufacturer’s?

Answer Use a 40 mil SA vapor barrier as manufactured by roof manufacturer. Fully adhered.

1. The standard 20 psi poly iso roof insulation?

Answer Yes, use a standard 20 psi poly iso insulation.

1. A cover board (it is shown in details)? If so, do we include gypsum board? Wood Fiber? Or High Density Iso?

Answer Use High Density iso.

1. For the application of the insulation and cover board, do they want it adhered or mechanically fastened to the steel deck? The spec provides for both options.

Answer Prefer foam to VB (adhere).

1. What is minimum thickness of tapered insulation?

Answer Minimum 2” at roof drains.

1. Is there a minimum R-value for the roof insulation?

The average R-valve will remain the same as existing, provide 2” min at roof drains with a minimum slope of ¼” per 1’-0” but most areas will be at ½” per 1’-0”. This will increase the existing roof slope and stay 8” down from the existing parapet counter flashing line.

1. What are the existing heights of drains?

The existing roof drain heights are not field verified. No roof cores have been performed. Provide scope as noted above. But add to the project scope to preform a core sample for review and confirmation before roof tear off begins.

RFI-07

In review of plans, specifications and the previously provided YouTube video, note the following questions which we are submitting for clarification. These questions are submitted to you in no specific order of importance.

7.1 Provide GC project laydown area on site? Can there be an area in the existing parking lot between buildings 1 & 23 for fenced in area for a project trailer and misc. items?

Answer Bid as noted in pre-bid meeting.

7.2 Can a video and photos be provided of the interior of the proposed work areas for Building 1 showing all interior partitions, offices and cubicles within the proposed work areas?

Answer COR to provide if possible but drawings 10 on sheet A1.0 illustrates the area under the skylight. The work in this area is noted on that drawing associated with protecting the occupied area.

7.3 Interior photo indicates existing sprinkler lines within the drywall skylight wells. Are these sprinkler lines to be painted? If to be painted provide specific paint specification.

Answer The existing sprinklers should not be impacted by this protect scope. If the existing sprinkler piping is damage as a result of this project it will be addressed at that time.

7.4 Have there been cores taken of the existing roof areas in both buildings 1 & 23 to test for ACM materials? Provide test results if they exist.

7.5 Is exterior lumber to be Fire Retardant treated or Pressure Treated Wolmanized for exterior use?

Answer All lumber used for this project to be Pressure Treated Lumber.

7.6 Provide clarification of off hours work times including weekends.

Answer To be provided by COR. 8am to 5pm is the daily medical center work schedule in the area under the skylight. Building 23 does not see patients or have visitors.

7.7 Can existing roof As-Builts for buildings 1 & 23 be provided?

7.8 Confirm that all drywall is to be patched and repaired to a level 4 finish?

Answer The only drywall work will be work associated to damage cause during skylight installation or temporary walls needed to protect area under the skylights. The resulting surfaces to be patched to level 4 and painted from corner to corner for the wall damaged.

7.9 Provide all paint specifications and sheens for all areas to be painted.

Answer In addition to what is noted above in RFI 7.8, the facia area of the skylight to be painted in its entirety to the nearest corner transition. The ceiling area to be flat and the wall area as noted above to be eggshell. All paint to match existing surface and medical center standards.

7.10 Provide details for the reattachment / reinstallation of existing stone copings on existing wall construction. Provide anchorage details.

Answer The existing anchoring system can be reused if salvaged carefully to reuse stone cap. However, the anchors could break and if so, you can use a masonry adhesive designed for the wind loads noted.

7.11 Are there to be safety railings in front of all skylight systems at base of skylights to stop possible fall through?

Answer That is a means and method for the GC to meet OSHIA and other VAMC safety standards. Please see photos to understand the existing curb heights for Bldg 1 skylights.

7.12 Crane layout area as defined on G0.1. Provide the following clarifications:

a) Confirm that there is no basement in building 1 within this general vicinity?

Answer COR to confirm but this crane location has been used before so there should be no basement structure below.

b) Is there a weight restriction for the crane?

Answer COR to confirm but this crane location has been used before so there should be no weight restriction other than road and ground limits.

c) Provide specific ground protection within crane area Answer That is a contractor means and method.

d) Provide crane / dumpster area for building 23.

Answer There is a small area to the southeast corner of Bldg 23 with direct access from the surface parking lot that is within the exterior fence area. This was verbally noted in the pre-bid meeting. No more additional information can be provided other then your own research on google maps or google earth.

7.13 Sheet A1.1 / detail 11, Is existing roof scupper strainer to be replaced? If replacement provide specification for new and size

The existing scupper strainer to be reused.

7.14 Sheet A1.1 / detail 13 & 18, Is roofer to utilized EPDM base flashing or termination bar on existing vertical wall or is EPDM to be installed over entire vertical wall construction. If vertical coverage is required, provide vertical height of existing wall construction.

Answer The EPDM to extend up and over the existing parapet and terminate on the face of the existing brick on the other side with new termination bar and counter flashing. Therefore, the existing stone cap is being removed. You must cover the top of existing block and brick with new EPDM before installing new through flashing and salvage stone.

7.15 Sheet A1.1 / Detail 17, Provide photos and detailed information of existing steel condenser leg / existing concrete curb. Information required to determine new sheet metal flashing.

Answer No additional photos are available. But here unlike what is noted above in RFI 7.14 you can reuse existing counter flashing with a new termination bar. EPDM to run up and under existing counter flashing.

7.16 Sheet A1.1 / detail 23:

a) Provide detailed photos of existing roof platform hatch Answer No additional photos are available.

b) Does existing hatch meet current building code? Suggestion: remove existing hatch completely and install new roof hatch with pop up safety post to comply with current codes.

Answer A conventional roof hath cannot be used. The top of the hatch is part of the worksurface platform, and a conventional hatch would pose a tripping hazard or restrict access under the platform. The existing hinges are rusted out. Provide new SST hinges sized for a 100lbs metal hatch with a safety hook or rod to hold the gate open when in use.

7.17 Sheet A1.2 / detail 4 calls for new cont. 2x wood blocking. Confirm the following:

a) Materials to be pressure treated wolmanized?

Answer All lumber used for this project to be Pressure Treated Lumber.

RFI-07 (7.17 Continued)

b) Provide approx. available dimension for 2x vertical dimension.

Answer The area noted is assumed to be a trimmed 2x6, the faced 2x6 will need to be new but the back 2x6 if in good shape can be reused. And remain in place. The intent is to install new skylights and flashing not do more then needed to accommodate the intent.

c) Provide details of existing standing seam metal roof including color. Is new flashing / counter flashing to be same color?

Answer The existing standing seam roof should not come into play. The counter flashing will need to be replaced. The existing color is clear anodized aluminum.

7.18 Sheet A1.2 / detail 19 calls for new clip angle to be installed. Provide the following information:

a) What is size and gauge of clip angle.

b) How is clip angle to be anchored into existing concrete beam?

c) What is dimension of clip angle to be installed from bottom of soffit to bottom of clip angle?

Answer The (clip angle stud support @ 4’-0”), is existing to remain and should not be impacted by the new skylight replacement. The clip angle should be noted as existing on detail 19/A1.2.

d) Detail calls for new tube steel welded to existing bent plate. Provide the size of the new tube steel components and what is weld pattern to be between new and existing?

Answer The manufacture is to size the steel support noted here. There will need to be stiffeners added within the bent plat at a minimum but the exact size and spacing to be determined by the skylight manufacture/supplier. Contractor to provide at a maximum 16ga 7/8” sq. tube at 4’-0” O.C.

e) Is the new and existing steel to be painted? Provide specific paint specification.

Answer The new and existing steel to be painted flat white to match existing GWB facia color. See spec for paint on steel.

f) Detail calls for removal of existing stone cap with new metal flashing to be installed. Provide detail of new 2x wood installation including proposed anchorage into existing bond beam? Confirm that masonry is 12” wide unit?

Answer The existing stone cap is salvaged and reused used at the shed skylight only. The curved skylight is an aluminum cap. The wood blocking is secured via existing anchor bolts and/or tap-con with masonry adhesive. Yes, the existing masonry wall are 12” wide units.

7.19 Sheet A1.2 / detail 20 calls for new bent plate to be replaced by skylight mfgr. Provide clarification on the following:

a) What is gauge of existing vertical metal stud to anchor into and what is method of anchorage into existing metal stud framing?

Answer The existing metal stud framing is 18 ga.

b) What is existing vertical metal stud anchorage system into existing construction? Is anchorage of existing sufficient to take imposed load from new bent plate / translucent panel system?

c) What is proposed load to be imposed on new bent plate?

d) What is size and gauge (thickness) of proposed bent plate?

e) Provide details for bent plate anchorage into existing metal stud vertical framing.

Answer The existing structure has been evaluated by a structural engineer and confirmed that the existing over framing can accommodate the new loads. The new bent plate and stiffening of the existing bent plate that cannot be removed is being replaced or modified to accommodate the new point loaded. These new point loads are to be calculated by the manufacture/installer to accommodate the skylight system. The anchor attachment to be specified by the skylight manufacture.

f) New 0.40 akum flashing end cap shows batt insulation within component. Is this to be batt insulation or mfgr suggested insulation?

Manufacture suggested insulation, provide an R-19 or greater.

7.20 It is assumed that the new / proposed skylight system is to match as closely as possible the existing design and materials. With this being stated, note the following questions. The specifications call out for polycarbonate material, but the drawings call out Fiberglass Translucent Systems. They also call out acrylic glazing. Provide clarification on what materials are to be used and where they are to occur in detail. It appears that the existing skylight system may be fiberglass sandwich translucent panel structural system? Per the skylight mfgr, polycarbonate or acrylic are not a sandwich panel that uses a structural grid. Polycarbonate nor acrylic are not the same material or construction as Fiberglass Translucent Panels. By using structural grid core, Fiberglass Translucent panels will meet requirements for OSHA Fall Through Protection with documentation as required. Provide clarification that this is the system that is to be utilized and provide correct specifications and details.

The skylights are 2/3 Fiberglass Translucent Panels and 1/3 Laminated Glass Panels in a unitized frame system to match the size of the existing Fiberglass Translucent Panel sizes being replaced.

7.21 Per specification / Metal Framed Skylights – Specification Section 086300

a) This section refers to Metal Framed Glass Skylights and references standards and criteria for glass only. If glass panels are to be utilized, the weight of the new skylight will be heavier than the existing and the existing supporting structure may not be sufficient. Verify and provide required specification for Fiberglass Translucent Skylight Panels.

Answer See RFI 7.19 and 7.20 above. The existing structure has been evaluated by a structural engineer and confirmed that the existing over framing can accommodate the new loads. The new bent plate and stiffening of the existing bent plate that cannot be removed is being replaced or modified to accommodate the new point loaded.

b) Provide clarification: There are two sections referenced as 2.3. One is called Materials and One called Fabrication. Provide clarification and specification for Fiberglass Translucent Panel Skylights Answer We are specifying both Fiberglass Translucent and Laminated Glass panels.

c) Paragraph 2.2.C – Deflection calls “ in direction of normal plane of glass”, however if we are to utilize translucent panels, specification requires revision. Provide clarification.

Answer This deflection is for the laminated glass.

RFI-07 (7.21 Continued)

d) Paragraph 2.3.C refers to glazing strips. Is this for glass or insulated translucent panels? Provide clarification.

e) Paragraph 2.3.D – refers to glass setting blocks. Are these also utilized for insulated translucent panels? Provide clarification

f) Paragraph 2.3 – this only refers to glass. Provide clarification.

Answer This is for the laminated glass panels.

g) Paragraph 2.3.C page 10 – Specification calls for skylight to be installed setting on a new curb. This is not what is reflected on the drawings and it is figured that the new skylight is to rest on the existing curb in place. Provide confirmation.

Answer The units: fiberglass and laminated glass panels, sit on new/modified bent plates but on existing framing.

h) Provide confirmation that existing skylight curb and supporting structure are of sufficient size and design to support new skylight system.

Answer See RFI 7.19 and 7.20 above. The existing structure has been evaluated by a structural engineer and confirmed that the existing over framing can accommodate the new loads. The new bent plate and stiffening of the existing bent plate that cannot be removed is being replaced or modified to accommodate the new point loaded.

i) Verify that skylight cap / cover system to be screw down not snap on type per paragraph 2.3.E , F and G. this is skylight mfgr standard Answer Screw down is acceptable.

j) Paragraph 2.4 Metal Finishes calls for a 3-coat HP Finish AAMA 2605. Per Kalwall, their finish is a 2-coat finish and is formulated per AAMA 2605 criteria. They indicate that it exceeds the requirements for AAMA 2604. They are currently in testing for compliance to meet AAMA 2605. Provide confirmation that their coat application and design is acceptable?

Answer 2-coat finish as formulated per AAMA 2605 criteria is acceptable.

7.22 Per specification / Glazing Section 088000

a) Paragraph 1.3.B.3 and Paragraph 1.4.C call out bullet resistant glass or plastic glazing assemblies. Is this correct?

Answer The glass does not need to bullet resistant, needs to be laminated for fall protection and safety to prevent falling glass if broken.

b) Paragraph 1.4.D – Windborne Debris Impact Resistance – This is usually for Florida and East Coast where hurricane issues exist. Is this needed in Columbia MO?

Answer The glass does not need to meet windborne debris impact, needs to be laminated for fall protection and safety to prevent falling glass if broken.

c) Section 2.5 Plastic Glazing – Is this Insulated Translucent Fiberglass Panels? Does this match the existing skylight system?

d) Section 2.11 – Calls for Insulating Plastic Sheets. Are these Insulated Translucent Fiberglass Panels? Does this match the existing skylight system?

Answer These sections do not apply. The skylights are 2/3 Fiberglass Translucent Panels and 1/3 Laminated Glass Panels in a unitized frame system to match the size of the existing Fiberglass Translucent Panel sizes being replaced.

7.23 In review of the Kalwall website and known information, provide clarification on the following:

a) What are specifications for the Insulated Translucent Fiberglass Panels. These are to be thermoplastic not glass or polycarbonate.

b) Is there specific flame spread which is required to be adhered too?

c) What is the specific panel color of the Insulated Translucent Fiberglass Panel to be installed?

d) Provide clarification of Insulated Translucent Fiberglass Panel thickness, insulating factors (U or R)

e) Provide clarification of supporting panels and if they are to be thermally broken?

Answer Fiberglass Translucent (TI) White Panels: 4” panels thickness, 25 Flame Spread, Thermally broken and 0.53 U, R-19.

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