Project Addendum 2 page.pdf

Project Addendum 2/7/2023

Replace the 2 pages of Roof description Scope of Work with these 2 pages. The revisions are highlighted in red.

Roof A – Located above Emergency Department and Police Locker Rooms

• Remove all rock ballast and membrane to light weight tapered concrete deck No vacuum removal allowed. Replace any damaged LWC.

• Attach ½” cover board, per manufacturer’s requirement, to LWC with crickets where ponding issues are present

• Install new 80 mil or equivalent TPO roof system (with full 30-year warranty)

• Contractor to remove and replace all flashing around this roof section to include a minimum

4 ½” coping sloped to drain with a minimum 8” vertical exterior flashing. This includes all wall flashing.

• As part of this roof section contractor must include the area above Police locker rooms (approximate 22’ x 40’). Existing roof is membrane and tapered insulation, and all shall be removed to the concrete deck. Replace with adhered tapered insulation @ ¼ Inch per foot slope. Contractor to match existing thicknesses. Adhere new 80 mil or equivalent TPO roof system (with full 30-year warranty. This work will require a new false curb where the roof replacement transitions to that remaining with an open scupper to allow existing roof drainage access to the existing roof drain.

• Paint yellow setback line per OSHA code

• Reinstall and waterproof equipment supports and walkways

Roof B This is an existing ballasted single ply roof. Contractor should:

• Remove rock to expose roof membrane (no Vacuum allowed). Remove existing membrane and stone mat and repair any damaged light weight tapered concrete.

• Attach 1/2” insulation cover board to LWC per code with crickets where ponding issues are present

• Install new 80 mil or equivalent TPO roof system (with full 30-year warranty)

• Contractor to remove and replace all wall flashing around this roof, section to include a minimum of 8” Vertical flashing

Roof C

• Remove roof membrane and wood walk decking from roof

• Remove roof to concrete deck

• Install new decking in covered area with railing and access gate. Decking to be made of

PVC boards.

• Adhere tapered insulation to concrete deck. Add crickets where ponding issues are present. Contractor shall match existing slope and thicknesses.

• Install new 80 mil or equivalent TPO roof system (with full 30-year warranty)

• Contractor to remove and replace all wall flashing around this roof, section to include a minimum of 8” Vertical flashing

• Install new roof walk pads along wall from Montgomery Hall Evacuation Door to covered deck and terminate at access gate on new deck

• Reinstall and waterproof equipment, supports and walkways.

Roof I Wing

• Remove roof membrane and existing tapered insulation from roof including elevator shaft roof

• Remove roof to concrete deck (all areas)

• Adhere tapered insulation per code to existing concrete deck with crickets to prevent ponding. Tapered insulation shall match existing slope and thicknesses.

• Install new 80 mil or equivalent TPO roof system (with full 30-year warranty)

• Contractor to remove and replace all flashing around this roof, section to include a minimum 4 ½” coping sloped to drain with a minimum of 8” Vertical exterior flashing and wall flashing adjacent to stair and elevator shafts

• Paint yellow setback line per OSHA code

• Contract shall include the vertical wall on both elevator shafts adjacent to the roof.

Atrium Area Roof

• Remove all membrane to existing light weight concrete tapered (LWC). Replace any damaged LWC.

• Attach a cover board to LWC per manufactures requirements with crickets to prevent ponding

• Reinstall and waterproof equipment, supports and walkways

• Install new 80 mil or equivalent TPO roof system (with full 30-year warranty)

• Contractor to remove and replace all flashing around this roof section, to include a minimum 8” Vertical wall flashing and the full depth of the atrium frame

General All existing conditions of each roof section shall be field verified prior to submitting bid for accuracy. Questions will be accepted through the Contracting Officer for clarification by VA.

Copies will be made available for any references throughout specifications upon request.

The roof replacements in all areas shall consist of, but not be limited to, complete demolition of the existing roofing system to bare structure, removal of all abandoned curbs, pipe-stands, equipment pads, etc.; sealing of existing abandoned roof penetrations, surface preparation, replacement of flashings and all other roof-related elements, installation of new roof per specifications, reinstallation of lightning protection, installation of new walkway pads, new perimeter warning line per OSHA guidelines and final cleanup.