HomeMy WebLinkAboutAddendum No. 1_4-6-2021_Baker Lab Roof Replacement Rebid (1)(2)CORNELL UNIVERSITY REBID BAKER LAB ROOF REPLACEMENT FACILITIES CONTRACTS 121 HUMPHREYS SERVICE BUILDING ITHACA, NEW YORK 14853-3701 ADDENDUM NO. 1 April 6, 2021 This Addendum contains changes to the requirements of the Contract Documents and Specifications. Such changes are to be incorporated into the Construction Documents and shall apply to the work with the same meaning and force as if they had been included in the original document. Wherever this Addendum modifies a portion of a paragraph of the specifications or a portion of any Drawing, the remainder of the Paragraph or Drawing shall remain in force. NOTE: Provisions of all Contract Documents apply. Item 1. Drawing A3.0, Overall Roof Demolition Plan, Demolition Scope Of Work Notes ADD the following: Remove the existing Durock substrate board on the metal roof deck areas. Remove the existing loose built up roofing on the concrete roof deck areas. The new vapor barrier can be installed over any remaining adhered built up roofing tar. (Refer to drawing A4.0 for the locations of the metal and concrete deck areas.) ADD: The Following Test Cut Photos: Concrete Deck
Baker Lab Roof Replacement Addendum No. 1 April 6, 2021 Page 2
Metal Deck
TECHNICAL SPECIFICATIONS Item 2. Section 075323 Paragraph 1.11.A.2: DELETE “Warranty Period: 20 years from Date of Substantial Completion.”
REPLACE with Warranty Period: 25 years from Date of Substantial Completion. Item 3. Section 075323 Paragraph 1.11.A: ADD item number 3. Wind speed to be 105. Item 4. Section 075323 Paragraph 2.6.B: DELETE “Polyisocyanurate Board… Grade 2, felt or glass-fiber mat facer on both major surfaces.”
REPLACE with “Polyisocyanurate Board…Type II, Class 2, Grade 3, 25 PSI, glass reinforced felt (GRF).
Baker Lab Roof Replacement Addendum No. 1 April 6, 2021 Page 3
Item 5. RFI Questions and Clarifications See attached RFI Log (Items 1-2) Attachments: RFI Log (Items 1-2) ****END OF ADDENDUM****
PROJECT: REBID BAKER LAB ROOF REPLACEMENT Date: April 6, 2021
RFI Form
RFI/Page/
Response Dwg./Spec./Rep.Section/Design Team
Index Number Paragraph/Topic RFI Response
1 Specification Section
075323 1.11.A
Section 1.11 Paragraph A: Is there a requested wind speed for
warranty?
See Addendum No. 1, Item 3.
2 Specification Section
075323 2.6.B
Section 2.6 Paragraph B: Specification calls for Class II,
Grade 2 polyisocyanurate insulation, which is coated glass
facer, 20 PSI. Following in paragraph insulation is stated to
be felt facer (Class I) or coated glass facer (Class II).
Compressive strength specified below is 25 PSI (Grade 3).
Can you confirm which insulation facer and compressive
strength is desired?
See Addendum No. 1, Item 4.