1. Statement of Work.pdf

Statement of Work GAOA Historic Bowerman Roof Replacement

1.0 - Scope of Work

The purpose of this project is to improve the roofing condition at Bowerman Barn. This will include removing the existing corrugated metal roof panels, installing 5/8” rough-sawn plywood sheathing, installing gable side edge flashing, and re-installing the corrugated metal roof panels.

Contractor shall furnish all material, labor, equipment, and transportation as required to accomplish the repairs. All demolition, disposal, and repairs described herein, for bringing waterline back not service are the responsibility of the Contractor.

BASE CONTRACT WORK – SOUTHSIDE ROOF

A) Mobilization

a. Mobilization shall include preparatory work and operations necessary for the movement of personnel, equipment, supplies, and incidentals to the project site;

for the establishment of facilities necessary for the work; for premiums on bond and insurance for the work; and for other operations performed or costs incurred before the beginning of work.

b. Contractor shall be prepared for, and in compliance with, the project Fire Plan during the performance period of the contract. Refer to the Fire Plan attachment to the contract.

c. The contractor will be responsible for the security of their equipment and materials, as well as for the general protection of the infrastructure that will be exposed to the contractor’s ingress/egress activity.

B) Remove/Protect Southside Corrugated Roof Panels

Work shall include but not necessarily limited to the following:

a. Refer to the Bowerman Barn Photos and Roof Replacement Sketches for general configuration.

b. Remove and protect existing ridge cap and corrugated roofing panels. Panels may be stockpiled in the adjacent areas of the Barn until re-installation.

c. Inspect exposed 1”x3.5” (at 12” on centers) for adequacy and advise government on soundness for reuse. Notify Contracting Officer’s Representative (COR) of condition of lath and if any replacements are needed. If lath repair and replacements are necessary, the Contracting Officer will be notified for determining procedures for proceeding with additional work.

C) Furnish/Install Southside 5/8” Rough Sawn Plywood Sheathing

a. Refer to the Bowerman Barn Roof Replacement Sketches for general configuration and notes.

b. Furnish replacement lath as directed by Contracting Officer. Install with (2) 10d

Common at each rafter crossing.

a. Furnish 5/8” DF Rough Sawn Plywood (PR/APA) roof sheathing. The estimated area is 3200 SF (verify) for the southside roof. Pre-stain (medium brown) on rough sawn side prior to installation. Submit samples for Gov’t review and acceptance prior to application. Stain absorption and distribution on the rough sawn surface may require additional effort and material for adequate coverage.

Consult stain manufacturer for suitable application rate.

b. Install pre-stained Rough Sawn plywood facing inward, transverse to rafters and staggered in relation to adjacent rows. Fasteners to be 2” exterior grade star-head deck screws, 6” edge & boundary and 12” in field. Trim sheathing so edges & boundaries are centered on lath members, adjust trim for gable and eve end conditions.

D) Install Gable Side Roof-Edge Corrugated Steel Panel Flashing

a. Use of government furnished property: 24”x96” corrugated steel panels.

b. Rip panels in length direction to 12” widths. The intent is to achieve a nominal 4” overhang along the barge rafter gable edge, and an 8” overlay onto the plywood sheathing. Fold at 90 degrees and flatten the 4” overhang edge to eliminate the corrugation prior to placement.

c. Install with self-tapping gasketed roofing screws to decking/rafter edge.

d. Fasten gable edge 4” overhang intermittently with self-tapping roofing screws at nominally 6’ O.C. or where competent backing is available.

E) Re-Install Southside Corrugated Steel Roof Panels

a. Utilize existing panels and re-install in original configuration. Maintain a minimum 6” lap. If material is short due to lap, notify COR for resolution.

b. Install panels with oversized self-tapping/gasketed roofing screws. Utilize existing screw holes and install additional fasteners in proximity of holes that do not align with framing members, as the case may be.

c. Re-install ridge cap in similar fashion.

NORTHSIDE ROOF

F) Remove/Protect Northside Corrugated Roof Panels

a. Refer to the Bowerman Barn Photos and Roof Replacement Sketches for general configuration.

b. Remove and protect existing corrugated roofing panels. Panels may be stockpiled in the adjacent areas of the Barn until re-installation.

c. Inspect exposed 1”x3.5” (at 12” on centers) for adequacy and advise government on soundness for reuse. Notify Contracting Officer’s Representative (COR) of condition of lath and if any replacements are needed. If lath repair and replacements are necessary, the Contracting Officer will be notified for determining procedures for proceeding with additional work.

G) Furnish/Install Northside 5/8” Rough Sawn Plywood Sheathing

a. Refer to the Bowerman Barn Roof Replacement Sketches for general configuration and notes.

b. Furnish replacement lath as directed by Contracting Officer. Install with (2) 10d

Common at each rafter crossing.

c. Furnish 5/8” DF Rough Sawn Plywood (PR/APA) roof sheathing. The estimated area is 2200 SF (verify) for the northside roof. Pre-stain (medium brown) on rough sawn side prior to installation. Submit samples for Gov’t review and acceptance prior to application. Stain absorption and distribution on the rough sawn surface may require additional effort and material for adequate coverage.

Consult stain manufacturer for suitable application rate.

d. Install pre-stained Rough Sawn plywood facing inward, transverse to rafters and staggered in relation to adjacent rows. Fasteners to be 2” exterior grade star-head deck screws, 6” edge & boundary and 12” in field. Trim sheathing so edges & boundaries are centered on lath members, adjust trim for gable and eve end conditions.

H) Install Gable Side Roof-Edge Corrugated Steel Panel Flashing

e. Use of government furnished property: 24”x96” corrugated steel panels.

f. Rip panels in length direction to 12” widths. The intent is to achieve a nominal 4” overhang along the barge rafter gable edge, and an 8” overlay onto the plywood sheathing. Fold at 90 degrees and flatten the 4” overhang edge to eliminate the corrugation prior to placement.

g. Install with self-tapping gasketed roofing screws to decking/rafter edge.

h. Fasten gable edge 4” overhang intermittently with self-tapping roofing screws at nominally 6’ O.C. or where competent backing is available.

I) Re-Install Northside Corrugated Steel Roof Panels

d. Utilize existing panels and re-install in original configuration. Maintain a minimum 6” lap. If material is short due to lap, notify COR for resolution.

e. Install panels with oversized self-tapping/gasketed roofing screws. Utilize existing screw holes and install additional fasteners in proximity of holes that do not align with framing members, as the case may be.

f. Re-install ridge cap in similar fashion – coordinate woth southside roof re-installation.

List of Attachments:

Sketches – Bowerman Roof Replacement Location Map Fire Plan

1.1 – Project Location

From Hwy 299 (Main Street) in Weaverville, CA, proceed north on Hwy 3 for approximately 23 miles to Guy Covington Drive and turn right. Proceed east/southeast on Guy Covington Drive (watch vehicle speed) for approximately 1.2 miles. Bowerman Barn is on the right-hand side of the road.

1.2 – Government Furnished Property

Corrugated steel panels 24”x96” (8’) will be made available for the gable side roof edge flashing.

All fasteners shall be furnished by the Contractor.

There is limited staging area at the Barn property. Stockpiling of roofing materials can be accommodated but must be coordinated with the Contracting Officer’s Representative (COR).

All security aspects associated with contractor owned equipment and materials are not the responsibility of the Government. The Government assumes no liability whatsoever for Contractor use of designated staging/laydown/overnight area. Contractor is solely responsible for the security of his/her possessions related to this project.

1.3 – Contractor Furnished Property and Submittals

Except as otherwise noted, the Contractor shall furnish all labor, materials, equipment, supervision, and transportation necessary for the successful completion of the work described in this contract.

1.4 - Utilities

Contractor shall be responsible for locating and protecting above and below ground utilities in the project area.

1.5 - Use of Utilities

Utility services are not available at the site. Sanitary facilities for contractor representatives and employees are the responsibility of the Contractor.

1.6 – Protection of Existing Improvements

Existing pavement, buildings, landscaping, and other existing improvements shall be protected by the Contractor. The Contractor shall be responsible for repairing any damage to existing facilities and improvements.

1.7 – Disposal

All construction waste material shall be properly and legally disposed of off government land.

1.8 – Time of Completion

All work (including final clean-up) shall be completed prior to September 3, 2021.