ITB 2023-1002 Eugene Public Library Roofing Addendum 2.pdf
PDF 4 MB Posted
- Solicitation number
- S-KS0043-00005339
- Issued by
- Marion County, Oregon
About this file
This is Addendum No. 2 to the contract documents for the Eugene Public Library Roofing and Exterior Improvements project, issued by the City of Eugene on January 20, 2023, in conjunction with Robertson/Sherwood/Architects pc. The addendum modifies the original contract documents dated December 30, 2022, and covers roofing improvements at the library located at 100 W 10th Avenue, Eugene, Oregon. Key modifications include specifications for membrane flashing materials in Section 07 25 00, requiring GCP Applied Technologies Perm-A-Barrier Aluminum Flashing; additions to Section 07 62 00 for stainless steel chiller pan flashing; and revisions to roof plan sheets A101, A102, and A103 regarding antenna and electrical connection box treatments. The addendum specifies new requirements for metal stud enclosures around existing concrete piers with stainless steel caps, removable counterflashing, and labeled concealed electrical connection panels. Acknowledged receipt of the addendum is mandatory, with failure to do so subject to bidder disqualification.
The addendum includes multiple technical modifications to roof details across sheets A201, A202, A205, and A206, including changes to cap flashing lap distances from nine inches minimum to forty-eight inches minimum around drains and the addition of lead flashing specifications set in mastic at thirty inches minimum square dimensions. Additional revisions address clerestory details, weather barrier overlap specifications, and the addition of backer rod and sealant requirements between curtain wall caps and sheet metal flashing. Sheets A205 and A206 are replaced in their entirety with new details designated as B5/A206, B6/A205, and D5/A205. The addendum establishes updated material requirements including preformed transition membranes in lieu of silicone flashing and mandates mock-up provisions for clerestory work.
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Text version
Addendum No. 2 20 January 2023
Architect Project No. 2207 City of Eugene GJN # 51252
Addendum No. 2-1
Permit No. 23-00057-01
Eugene Public Library Roofing and Exterior Improvements 100 W 10th Avenue Eugene, OR 97401
Robertson/Sherwood/Architects pc 132 East Broadway – Suite 540 Eugene, Oregon 97401
This Addendum forms a part of the Contract Documents and modifies the original Documents dated 30 December 2022 as noted below. Acknowledged receipt of this Addendum is required.
Failure to do so may subject the Bidder to disqualification.
P R O J E C T M A N U A L
1. SECTION 07 25 00 – WEATHER BARRIERS
A. Add Paragraph 2.02.B as follows:
“B. Membrane Flashing: Aluminum faced rubberized asphalt/polyethylene self-adhesive membrane.
1. GCP Applied Technologies Perm-A-Barrier Aluminum Flashing:
www.gcppat.com”
2. SECTION 07 62 00 – SHEET METAL FLASHING AND TRIM
A. Add Paragraph 3.03.H as follows:
“H. Chiller Pan Flashing Formed Stainless Steel 20 Gage No. 4”
S H E E T D R A W I N G S
3. SHEET A101 – ROOF PLAN - SOUTHWEST
A. Roof Plan C1/A101: Change roof keyed notes at antenna and electrical connection box from “7” to “19”.
B. Keyed Note 6: Change detail reference from “B3/A204” to “D5/A205.”
C. Keyed Note 19: Replace keyed note 19 to read as follows:
“Existing antenna on round concrete pier and electrical connection box. Provide new metal studs around existing round concrete pier to facilitate a continuous curb around the concrete pier and connection box. Install a stainless steel cap around the new enclosure with x-break slope at top for drainage. Provide removable stainless steel counterflashing 12” above roofing. Provide removable panel with label at any concealed electrical connections.”
D. Clarification: Changes to Roof Keyed Notes on Sheet A101 apply to Sheets A102 and A103.
Addendum No. 2 20 January 2023
Architect Project No. 2207 City of Eugene GJN # 51252
Addendum No. 2-2
4. SHEET A201 – ROOF DETAILS
A. Detail A1/A202: Change lap distance of cap flashing from “9 inches min.” to “48 inches min. around drain”
B. Detail A1/A202:
1. Add lead flashing between the cap sheet and base flashing around the roof drain.
2. Add note to read as follows: “Lead flashing 30” minimum square set in mastic. Wrap down 2” min into drain. Prime top surface before flashing.”
5. SHEET A202 – ROOF DETAILS
A. Detail C1/A202: Change lap distance of cap flashing from “9 inches min.” to “48 inches min. around drain”
B. Details D1/A202, D4/A202, C1/A202, and C4/202:
1. Add lead flashing between the cap sheet and base flashing around the roof drain.
2. Add note to read as follows: “Lead flashing 30” minimum square set in mastic. Wrap down 2” min into drain. Prime top surface before flashing.”
6. SHEET A205 – ROOF DETAILS
A. Replace Sheet in its entirety. Changes include added Details B5/A206, B6/A205, and D5/A205.
7. SHEET A206 – CLERESTORY DETAILS
A. Replace Sheet in its entirety. Changes include the following:
1. Detail B1/A206: Revise the overlap order of the new and existing weather barrier.
2. Detail B2/A206: Add backer rod and sealant between curtain wall cap and sheet metal flashing.
3. Details B2/A206 and B4/A206: Change note from “(n) silicone flashing” to “(n) preformed transition membrane”
4. Detail A4/A206: Replace detail as shown.
5. Clerestory Elevation D1/A206: Add note for mock-up.
END OF ADDENDUM NO. 2
| Addendum 2-1 |
| Addendum 2-2 |
| A205 - Roof Details |
| A206 - Clerestory Details |
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