S06 - Attachment 2 - Addendum 1 603-18-301 Replace Roofs Phase 1.pdf

603-18-301 Replace Roofs Phase 1

Addendum 1

1. Delete Roof Section 8A from the Alternate #1 Deduct. Insert Roof Section 7B into the

Alternate Deduct #1. Reference Drawing G-001 for Deduct revision. Reference

Specification Section 01 00 00 paragraph 1.2.B Alternates and replace “8A” with “7B”.

2. Reference Drawing A-101 for added General Note: “CONTRACTOR SHALL INSTALL

NEW NEOPRENE OR ANTI-VIBRATION PADS UNDER NON-PENETRATING

EQUIPMENT/CONDUIT SUPPORTS IN CONTRACT ROOF AREA. ADHERE PADS

TO ROOF MEMBRANE”.

3. Reference Drawings A-102, A-104, A-105, A-108, A-110, & A-111. Typical Keynotes have been added to clarify roof scupper work is included in roof work.

4. Reference Drawing A-105. Existing roof fixed ladders are noted as Keynote #3 for removal. The ladder to roof 1A has been clarified as Not-In-Contract.

5. Reference Drawing A-108. Add Keynote #8 “FURNISH AND INSTALL NEW CROSS-

OVER STAIRS. REFER TO SPECIFICATIONS 055000 METAL FABRICATIONS.”

6. Reference Drawing A-108. Furnish and install roof cross overs as noted on drawing.

7. Reference Drawing A-110. Add Keynote #8 “FURNISH AND INSTALL NEW CROSS-

OVER STAIRS. REFER TO SPECIFICATIONS 055000 METAL FABRICATIONS.”

8. Reference Drawing A-110. Add Keynote #9 “FURNISH AND INSTALL NEW "SHIP"

STAIRS. PROVIDE NEW CURB FOR MOUNTING OF BASE. ATTACH UNIT TO

PARAPET WALL PER SPECIFICATIONS. REFER TO SPECIFICATIONS 055000

METAL FABRICATIONS.”

9. Reference Drawing A-110. Furnish and install roof cross overs as noted on drawing.

10. Reference Drawing A-110. Furnish and install fixed ladder as noted on drawing.

11. Reference Drawing A-110. Furnish and install ships stairs as noted on drawing.

12. Reference Drawing A-111. Add Keynote #7 “FURNISH AND INSTALL NEW ROOF

STAIRS ON ROOF 4D WITH LANDING AND "SHIP" STAIR TO ROOF 4A. ROOF

4A SHALL BE NON-ATTACHED BASE PER DETAIL. PROVIDE AND INSTALL

CURB ON 4D ROOF TO ATTACH BASE TO. ANCHOR BOTH SIDES OF STAIRS

TO PARAPET WALL PER SPECIFICATIONS. REFER TO SPECIFICATIONS

055000 METAL FABRICATIONS.”

13. Reference Drawing A-111. The keynote for the ladder to roof 1A has been clarified as

Not-In-Contract.

14. Reference Drawing A-111. The keynote for the ladder to roof 5B has been clarified as in the base contract.

15. Reference Drawing A-111. Furnish and install stair crossover from 4A to 4D as noted.

Both sides of the stairs are in the base contract.

16. Reference Drawing A-113. Add Keynote #8 “FURNISH AND INSTALL NEW CROSS-

OVER STAIRS. PROVIDE INSTALL CURB AT BASE TO MOUNT BASE OF

STAIRS TO. REFER TO SPECIFICATIONS 055000 METAL FABRICATIONS.”

17. Reference Drawing A-113. Furnish and install fixed ladder as noted on drawing.

18. Reference Drawing A-113. Furnish and install cross over stairs as noted on drawing.

19. Reference Drawing A-113. The keynote #6 typical has been added to clarify that all scupper work for Bldg 12 roof is in the Deduct Alternate #2.

20. Reference Drawing A-501. Added Cross-Over Non-Penetrating Detail.

21. Reference Drawing A-503. Added Paverstone Detail.

22. The ladder rungs shall not be bars. Reference Specification section 05 50 00. Refer to paragraph 2.5 C 1 and replace “Fabricate from 25mm (one inch) diameter steel bars.”

with “Ladder Flat Rung Plank, at least 14 Gauge (.0785" Thick), 2” to 2-1/2” Open

Surface Width, 1-1/8" Channel Depth, rungs shall have extruded aluminum channels that are serrated to produce a non-skid surface with no sharp edges, Long Way of Opening

(LWO) Parallel to Width of Ladder Rung Plank, 34% Open Area.”

23. Reference Specification section 05 50 00. Add the following paragraphs:

2.6 Roof Stairs

A. Shall be prefabricated aluminum metal stairs.

B. Shall meet all OSHA Compliance.

C. Shall have 26" wide stamped positive-traction surface.

D. Shall have 9" run and 9" rise per step meets OSHA 1910 regulation

E. When required by OSHA stairs shall have ANSI yellow handrail and midrail for high visibility and safety.

F. Sturdy 2" diameter round handrail for smooth grabbing surface.

G. Additional top handrail to transition to platform handrail height.

2.7 Roof “Ship” Stairs

A. Use “ship” stairs for applications where standard stair length runs are not feasible. “Ship” stairs shall between 50° to 70° of incline.

B. Shall meet OSHA requirements in proposed section 1910.21.

C. Shall be prefabricated aluminum metal stairs.

D. Shall have a 24” tread width and 4” tread depth.

E. Ship stairs shall have ANSI yellow handrail and midrail for high visibility and safety.

24. Reference Specification section 05 50 00. Add the following paragraph:

3.4 Non-Penetrating Base Roof installation

A. Use a curb mount unless directed otherwise. Stairs near parapets shall still be anchored into parapets.

B. The stair is anchored to the stair base with countersunk bolts to a flat metal plate. The flat plate is rigid enough to distribute the weight over a wide surface area to prevent damage from point load and leaks. A thick neoprene pad is glued between the metal base plate and the roof, protecting the roof from the abrasive metal. Adhere the neoprene pad to the roof surface to prevent shifting.