Responses to Questions (1-11) Amendment 0003 Replace Honor Annex Roof 589-22-105.pdf

Replace Honor Annex Roof BLG 55 KC | Bidding Questions Amendment 0003 April, 14, 2023

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1. Will roof core cut information be provided at various locations?

Response: Core analysis and construction documents are available for Contractor reference by request as described in Section 07 01 50.19 Preparation for Re-Roofing, Article 1.7 Field Conditions. See attached core analysis.

2. Can we schedule to take our own core cuts?

See attached core analysis. This mitigates the need for core cuts.

3. 017419 Construction Waste Management

• 1.1, D, 8 - Bitumen Roofing Materials – there is no local facility or service provider to recycle this material. Can this be disposed of in the landfill?

• 1.1, D, 10 - Insulation – there is no local facility or service provider to recycle this material. Can this be disposed of in the landfill?

It is the Contractors’ responsibility to develop a plan and legally dispose of all waste materials as described in Section 07 01 50.19 Preparation for Re-Roofing, Article 3.9 Disposal and Section 01 74 19 Construction Waste Management.

4. 055100 Metal Fabrications - please clarify.

• Detail E5/A502 indicates to supply a new ships ladder per specification 055100 Metal Fabrications

• Section 077200 Roof Accessories, 1.1, A calls out for a Gilmore-Kramer Company Type: Hatch Access or Walk through rails with flush top tread ships ladder 68° Steep incline or COR approved equal.

Provide manufactured roof access ladder as described in Section 07 72 00, approved equal, or custom fabricate per Section 05 51 00, Metal Stairs (or approved equal), to match ladder as described in Section 07 72 00.

5. 070150.19 Preparations for Re-Roofing

• This section indicates the existing insulation system is Lightweight Insulating Concrete to remain.

• Section 072200 Roof and Deck Insulation and details C8 & E8/A502 indicate we are to install a dry insulation system meeting an overall average R=33.

• Please clarify.

Refer to core analysis for existing roofing assemblies. To our knowledge there is no lightweight insulating concrete in this project. Specification will be amended to reflect this clarification.

6. 071200 Built-Up Bituminous Waterproofing

• Where does this specification apply?

Omit Section 07 12 00 Built-Up Bituminous Waterproofing.

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7. 072200 Roof and Deck Insulation

• 3.5, A call out for a vapor retarder – the only detail showing a vapor retarder is F7/A501 for the metal deck. Are we also installing a vapor barrier at the concrete deck?

• Detail C8/A502 indicates the base insulation layer is to be attached to the metal deck. Are we fastening through the substrate board and vapor barrier, or will this layer be adhered?

• 3.7, C indicates we are to mechanically fasten the coverboard. Are we to fasten through the underlying layers of insulation, vapor barriers and substrate boards or will the coverboard be adhered?

Metal deck and concrete deck to receive vapor retarder. Base layer of insulation to be mechanically attached to deck. BUR base sheet to be mechanically anchored to fully adhered coverboard as part of a 20-year assembly approved and warrantied by BUR roofing membrane manufacturer.

8. 0724500 Exterior Insulation and Finish System

• Plan Sheet AD103, Keynote 4 calls to remove the existing EIFS assembly. Are we replacing this EIFS with new EIFS, or something else? No detail provided.

EIFS is to be replaced where removal is indicated.

9. 075216 SBS Modified Bituminous Membrane Roofing

• 1.2, A, 1, a and 2.3 and 3.4 call for a mechanically attached base sheet attached to lightweight insulating concrete. Please clarify. Ignore reference to lightweight insulating concrete.

• 1.10 Warranty – If Bid Item II, Deductive Alternate No. 1 is accepted does this include all the manufacturer’s warranty, inspection, and maintenance requirements?

This alternate only removes Manufacturer Inspection, Preventative Maintenance Requirement, and Maintenance Agreement. The basic 20-year “Manufacturer’s Warranty” and the 5-year “Installer’s Warranty” will remain.

10. 076000 Flashing and Sheet Metal

• 2.3, D indicates thickness of aluminum or galvanized steel is specified in each item. I find this designation for the drip edge and the counter flashings to be .080 aluminum. I cannot find this designation on the coping caps and the gutters.

Metal gages should comply with SMACNA minimum standards for purpose and type of metal. Assume

0.080 aluminum for gutters and copings.

11. Will there be internal access to the facility?

Contractor’s will need to access the roof from the outside when possible and not enter facility.

Something such as external stairs may be utilized. Exceptions will be when activities require internal work such as on the roof drains or roof hatch.

End Summary of Changes