JOHNSON COUNTY COMMUNITY COLLEGE
12345 College Blvd., Overland Park, KS 66210
Ph. 913-469-3812
Fax 913-469-4429
ADDENDUM #4
April 30, 2015
REQUEST FOR BIDS #15-032
ROOFING REPLACEMENT PROJECT
NEW DUE DATE/TIME: 2:00PM on MAY 13, 2015
PLEASE NOTE THAT THE DUE DATE AND TIME HAVE BEEN UPDATED
1.
Question: Will lightning protection recertification be required for each building or only for the sections that are being
reroofed?
Answer: Recertification of the lightning protection system will be required only for the sections being reroofed.
2.
Question: At the Carlsen Center roof why does the lightweight concrete need to be removed?
Answer: The extents of insulation and lightweight concrete removal at CC is specified in Section “Task Items”.
3.
Question: At the Carlsen Center roof Section D does the roof deck slope?
Answer: At the Carlsen Center roof the area of Section D east of the expansion joint has a sloped structural concrete roof
deck. The area of Section D west of the expansion joint has a flat metal roof deck. Section E has a flat metal roof deck.
4.
Question: At the Carlsen Center roof Sections D and E are all of the coping caps going to be replaced?
Answer: Yes.
5.
Question: At the Carlsen Center roof Section D the grounding cable for the lighting protection at the base of the building is
exposed. Will the grounding cable need to be buried?
Answer: Yes.
6.
Question: Will applicable lightning components be installed per current codes? (We noticed quite a few systems on various
roofs would not meet current code.)
Answer: Lightning protection systems should be reinstalled per current code.
7.
Question: The coping caps on many of the sections of the Roofing Replacement Project have a sloped brick face at the
exterior edge, the drawing show the new coping caps without the sloped face. Will additional wood nailers be required to
support the coping cap?
Answer: The contractor may at their option provide either additional blocking to support a single-sloped coping similar to
that shown on the contract drawings or provide a coping cap formed to fit the sloped brick profile.
8.
Question: Which Section is a part of the Base Bid at the WLB roof?
Answer: The WLB roof Section B is included as the Base Bid. Sections A and C are included as an alternate.
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9.
Question: The GYM roof Section F appears to have isocyanurate insulation factory laminated to the Tectum roof deck. Can
the isocyanurate insulation be left in place?
Answer: The insulation and existing coverboard at GYM Section F shall remain in place. The following amendments are
made the contract documents:
Section 01 10 00.01 “Task Items - GYM Sections F, G, H”, Task Item 2.1(A)(3) shall be amended to read:
3. Remove the existing roofing as follows:
a.
GYM Section F: Remove existing roofing membrane with all membrane flashings, base flashings,
and sheet metal flashings and trim. Existing fiberboard protection board and insulation shall be
left in place.
GYM Sections G and H: Remove all existing roofing down to structural decking. Tear off all base
flashings. Remove all existing fiber cants at base of curbs and walls. Remove existing insulation
and cover boards using all necessary precautions to avoid damaging the structural roof deck.
b.
Section 01 10 00.01 “Task Items - GYM Sections F, G, H”, Task Item 7.1(A) shall be amended to read:
1.
Work consists of providing a new mechanically fastened substrate board with an adhered asphaltic vapor
barrier over areas of metal roof deck, providing a new mechanically fastened cover board only at areas of
cementitious wood fiber roof deck, or providing a vapor barrier only at areas of concrete roof deck.
Extents of Installation:
a.
b.
GYM Section F: Cover board only with vapor barrier..
GYM Sections G and H: Cover board with vapor barrier.
2.
Section F: Install substrate board on top of existing fiberboard and mechanically fasten to cementitious
wood fiber deck using fasteners specifically recommended for deck type.
3.
Sections G and H: Install substrate board on top of steel decking. Mechanically fasten sheathing to decking.
4.
Install single-ply modified bitumen membrane in hot asphalt, cold adhesive, or provide a self-adhering
sheet to serve as a vapor barrier on top of substrate board. Extend vapor barrier minimum 8-inches up all
vertical surfaces. Terminate as directed by sheet manufacturer. Seal all edges and at all penetrations.
5.
All membrane materials and accessories shall be VOC compliant. Coordinate with Owner prior to use of
solvent based primers to prevent infiltration of odor through intake louvers and the building HVAC
systems.
10. Question: Which Section is a part of the Base Bid at the WLB roof?
Answer: The WLB roof Section B is included as the Base Bid. Sections A and C are included as an alternate.
11. Question: Can the bid due date be extended?
Answer: Yes. The new due date and time is 2:00p.m., May 13, 2015.
12. Question: Can you provide the names of firms in attendance at the 2nd site tour?
Answer: The following firms were in attendance at the second site tour:
Preferred Lightning Protection, Premier Contracting, Inc., Delta Innovative Services, Flynn Midwest LP.
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13. Question: The WLB roof Section A the modified bitumen base ply and insulation are mechanically fastened to the Tectum
roof deck. Removing the fasteners from the Tectum roof deck may damage it.
Answer: The insulation and base ply of modified bitumen shall remain in place. The following amendments are made the
contract documents:
Section 01 10 00.01 “Task Items - GYM Sections F, G, H”, Task Item 2.1(A)(3) shall be amended to read:
3. Remove the existing roofing as follows:
a.
b.
WLB Section A: Remove existing roofing membrane cap sheet only with all membrane flashings, base
flashings, and sheet metal flashings and trim. Existing membrane base sheet and fiberboard protection
board and insulation shall be left in place.
WLB Section C: Remove all existing roofing down to structural decking. Tear off all base flashings.
Remove all existing fiber cants at base of curbs and walls. Remove existing insulation and cover boards
using all necessary precautions to avoid damaging the structural roof deck.
14. Question: Are we changing the curb height on the skywalks?
Answer: LIB Section C and the SCI Section F will have sufficient depth to achieve the necessary thickness of insulation for
the required R-value with the existing curb heights. SCI Section G does not have sufficient depth to achieve the necessary
thickness of insulation for the required R-value with the existing curb heights and will need to be increased with treated wood
blocking.
15. Question: At the CLB roof Section E can we change the orientation of the slope of roofing system?
Answer: Conrtactor may prepare bids based on alternate roof sloping plans providing that positive drainage to existing roof
drains and/or scuppers will be required at all locations. No areas of no-slope or ponding will be allowed.
16. Question: Would you accept a TPO or PVC alternate?
Answer: Membranes for this project are limited to SDS modified bitumen per contract documents.
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