Department of Facilities and Transportation Services

Office of Design and Construction Services

8115 Gatehouse Road, Suite 3500

Falls Church, Virginia 22042-1203

ADDENDUM #1

Date: September 15, 2020

Project: Poe Middle School Roof Replacement Project (Bid # 21-008)

THIS ADDENDUM IS SUPPLEMENTARY TO THE PLANS AND SPECIFICATIONS FOR THE PROJECT. ALL CHANGES, ADDITIONS AND DELETIONS SHALL BECOME PART OF THE CONTRACT AS IF ORIGINALLY CALLED FOR IN THE SPECIFICATIONS.

PRE-BID CONFERENCE AGENDA

Pre-Bid Meeting for Poe M.S.- 9/14/2020 Bid- 9/23/20 Winter/Spring/Summer Work 636 Sq. Re-roofing +/-

Discuss early starting times if available.

Addendum #1- You must acknowledge read receipt for any project bidding on!

Start Date- See Section 01010-3.

Discuss Winter Break (12/19/2020- 01/02/2021)

Two weeks kids are off, Spring Break (03/27/2021- 04/03/2021)

Saturday work available but optional. Must start the winter projects 12/21/20 weather permitting. Both schools no exceptions!

Roofs must be vacuumed off. Contact us for accessibility.

Substantial completion date- 8/21/2021- all hot work completed. Metal work can continue. No work of any kind the first week of school.

Final completion date- 09/30/21. All punch list items are complete and accepted by the Owner.

Only roof areas shown on the roof plan provided are to be replaced.

This is a complete tear off project!

07510 (B/U/R) and 07530 (TPO) are the roofing types.

Manufacturers are Johns Manville, Firestone, Soprema and GAF only!

Refer to 07510 for the guidelines with these manufacturers.

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Roofing is a 20 year NDL warranty.

Insulation: 2 layers 2.5” ISO mechanically attached staggering each layer. Over the existing deck (confirm deck types). ½” cover board staggered in full mopping of asphalt.

Felts: JM Type 4 Soprema Type 4 Firestone Type 4 GAF Type 4

Base Flashing: JM 1 ply DYNA BASRPR and 1 ply DYNA GLAS FR CR G Soprema 1 ply Sopralene Sandes PS and 1 ply Sopra Star FLAM Firestone 1 ply premium base and 1 ply Ultra White GAF 1 ply Rubberoid mop smooth 1.5 and 1 ply Siplast Parafor 30BW

#15 lb. felt installed at all curbs and perimeter walls-no exceptions!

All cants and tapered insulation in solid asphalt.

Replace all roof drains: All drain assemblies including the deck pans. Drain insulation is 1” hard wrap covering the entire drain underneath.

Sump is 12’ x12’. See detail 07-5.

Cover the entire sump area with base flashing material and extend a minimum of 6” out on to the roof. Prime both sides of the lead. Strip in the lead with 2 plies prior to installing base flashing.

Replace all P/P with either stainless steel or copper. Liquid flashing is preferred and use P/P only where approved by FCPS.

Abandoned curbs/ P/P, dunnage, PRV or capped off curbs will be removed and the deck infilled with the same material.

All P/P, pipe flashings will be stripped in with 2 plies of felt. All gravel stops connecting with the B/U/R system will be stripped in with 2 plies of felt then covered with a ply of base flashing.

Stone is Texas #7 White A.S.T.M. #1863 only

Allowance for projects is $25,000.00- do not forget to add.

Liquid flashing at drains, gravel stop edges and scuppers-no roof cement.

Note-wall panels- see roof drawing!

Ground coverage-must cover sidewalks and grounds with plywood! You don’t cover, you will replace!

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Work in the school prior to the school ending is by FCPS approval only!

Check the roof plans closely.

Any questions ask before you install.

QUESTIONS/ANSWERS/STATEMENTS FROM BIDDERS

Question 1: When flashing the curb of the units does unit have to be lifted?

Answer 1: If the existing counter flashing is accessible then the unit does not have to be lifted.

Question 2: Are we getting rid of overflow drains?

Answer 2: Yes, drain is to be removed and pipe extended up through the roof.

Question 3: Do we figure in our bid to relocate drains too close to walls, or curbs, etc.?

Answer 3: No. Bid as is.

Question 4: What do we do with the expansion where the 2 story meets the small bumped up section?

Answer 4: Leave existing wood and add it to obtain the minimum 8 inches of flashing height.

Question 5: How are we to flash the units which supply the lecture hall?

Answer 5: Do not figure anything here, bid as is.

Question 6: At front roof which meets the 2 story what is getting paneled?

Answer 6: Only the brick, do not panel over the existing white metal flat panel sections.

Question 7: What is to be done at the corner of the front lower roof where it meets the roof around the corner divided by a low expansion?

Answer 7: Build a wall from the corner of the building to the outside edge to match heights, and then put the expansion on top of the wall.

General Note: At all areas where the expansion joints do not meet the 8-inch minimum flashing height requirements, figure to add wood as needed to achieve the 8-inch minimum flashing height requirement.

All other terms and conditions remain the same.

Paul Liverman, Roofing Manager Office of Design and Construction Services

Attachments: Pre-Bid Attendees List Plan Holders List

cc: Contract File

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