B08_Attachment_1_Scope_of_Work.pdf

STATEMENT OF WORK:

Replace Roof Shingles on Quarters #1 and #2

George Washington Birthplace National Monument

Colonial Beach, Va. 22443

1. Summary of Work:

A. General Description:

This project consists of replacing cedar roof shingles on two (2) structures at George Washington Birthplace National Monument. Quarters 1 (Q1) and Quarters 2 (Q2) serve as park housing. The existing cedar shingles, flashing, underlayment and board sheathing both housing units will be removed down to the roof rafters. Repairs will be made to one (1) roof rafter on Q1. The contractor will install new plywood sheathing, underlayment, roof ventilation mat, copper flashing and new Number 1 Grade Certi- Sawn “Tapersawn” Western Red Cedar Shakes on both structure’s roofs.

B. Quantities:

Quarters 1 Roof – Approximately 2,400 square feet

Quarters 2 Roof – Approximately 2,200 square feet

C. Location/Address:

Quarters 1 240 Bridges Creek Road Colonial Beach, VA 22443

Quarters 2 244 Bridges Creek Road Colonial Beach, VA 22443

D. Qualifications:

All prospective contractors must show past evidence of work experience installing cedar shake/shingle.

All prospective contractors must be licensed and insured.

E. Period of Performance:

The Contractor shall complete all Work within 45 calendar business days after receipt of Notice to Proceed.

F. Pre-quote Site Examination:

All prospective contractors, and their Subs, as appropriate are strongly encouraged to visit and examine the existing conditions of the Project prior to submission of Quote in order to better understand the Work, and aid in forming any questions prior to the submission of Quote.

Any and all discrepancies shall be forwarded to the Contracting Officer in writing for clarification prior to the commencement of Work. Any Work performed prior to said clarification, particularly and including that which may require correction shall be corrected by the Contractor with no additional costs to the Contract and Government and no time extension shall be made to the Contract Schedule. Lack of knowledge of the existing conditions will not be allowed as a basis for extra compensation.

2. Scope of Work:

In accordance with the terms and conditions of the Contract, the Contractor shall perform the work of this Statement of Work (SOW) for the National Park Service (NPS) as described below.

All Services performed under this SOW shall be performed in accordance with applicable codes, accepted industry standards, and under the direct supervision of a contractor licensed in the State of Virginia, or location of the firm as approved by the Contracting Officer.

The Contractor is responsible for furnishing all labor, supervision, supplies, equipment, tools and materials, all supplementary or miscellaneous items, appurtenances and devices incidental to or necessary for performing all operations required to include, but are not limited to, the following to complete the scope of work.

A. Contractor Use of Premises:

General: The contractor’s use of the site is limited to the areas defined as “Limits of Work” and “Staging Area” as identified by the COR.

B. Protection/Prevention:

Protect both structures and surrounding area from damage and/or contamination due to construction activities at the jobsite. Must protect the attic areas of both houses from falling objects such as construction debris, tools, and trash. Must prevent anything from falling into the ceiling insulation causing it to become contaminated and/or disturbed. Contractor shall implement procedures to ensure no damage is caused by workers and/or construction related materials/debris to the ceiling plaster.

Cover the roof at the end of each workday to prevent water infiltration into the both houses during the installation of the new roof. The cover used shall be in good condition, free of any holes and be large enough to cover any openings in the roof that may allow water to interior and damage the interior of the buildings.

C. Demolition/Removal:

Remove and dispose of cedar shingles, including old fasteners, old step flashing, counter flashing, and valley flashing, felt paper underlayment, ¾-inch shingle strip boards, and ½-inch fiber board sheathing.

All related construction debris generated from the removal or installation process must be collected and disposed of properly in accordance with applicable Federal and State regulations.

D. Framing/Sheathing installation:

Repair Damaged Roof Rafter; install a 12-foot long 2-inch x 6-inch #2 premium grade SPF dimensional lumber on both side of damaged roof rafter, sistering them to the existing damaged rafter with 2 ½ -inch wood screws. (Fastener pattern shall be double row 1 ½ -inch from edge and maximum 16-inches apart).

Furring Strips; install 1-inch x 2-inch whitewood furring strips on top of roof rafters. Fasten furring strips to the rafters using 8d smooth shank framing nail.

Roof Sheathing; install 15/32 -inch x 4-feet x 8-feet pine plywood sheathing on both houses. Fasten the plywood sheathing to the rafters using 8d smooth shank framing nail. (Plywood Nail Pattern shall be 6-inch on center along the perimeter and 12-inch on center in the field).

Leave a 2-inch-wide slot/opening along the ridge of both houses for ventilation.

E. Roof Underlayment:

Valleys and Eaves; use 36-inch-wide rolls of ice and water shield polypropylene self-adhesive underlayment to all valleys and the first 3-feet from the edge of roof eaves, overlapping the copper drip edge flashing. Fasten the ice and water shield to the plywood sheathing using 1-inch plastic cap nails.

Roof Sheathing Deck; use 48-inch-wide rolls of synthetic roof underlayment on the remain areas of the roof sheathing deck. Fasten the synthetic underlayment to the plywood sheathing using 1-inch plastic cap nails.

F. Copper Flashing:

Material; 16 oz. copper flashing

Drip Edge; install copper drip edge flashing directly to the plywood sheathing along the eave lines of both roofs, prior to the installation of the ice and water shield. Fasten the drip edge using 1 ¼ -inch smooth shank copper roofing nails.

Step Flashing; install copper step flashing where a vertical wall or chimney meets the sloping roof plane.

Fasten the drip edge using 1 ¼ -inch smooth shank copper roofing nails.

Valley Flashing; install copper “W” copper valley flashing at all roof valleys on both buildings. Joints must overlap min. 2-inches. Use copper locking clips and fasten to roof sheathing using 1 ¼ -inch smooth shank copper roofing nails.

Counter Flashing; install copper counter flashing where the roof plane meets the chimney. The counter flashing shall be uniform and consistent in size, equally overlapping the step flashing and tucked into the mortar joint.

Pipe Flashing; all pipe penetrations in the roof shall receive a copper pipe flashing.

G. Ventilation:

Cedar Breather Roof Ventilation Mat; roll out the ventilation mat over the synthetic roof underlayment, do not overlap butt the edges of the mat. Cover all the roof surface prior to installation of cedar shakes.

Ridge Vent; install Cedar Breather Ridge Vent on both houses.

H. Cedar Shakes:

Material; 18-inch long x ¾-inch thick Number 1 Grade Certi-Sawn “Tapersawn” Western Red Cedar Shakes. 7 ½-inch exposure

Install Cedar Shakes per manufacturer’s instructions on both structure’s roofs. The fasteners used for the new shakes will be type 304 stainless steel ring shank nails, 6d, length 2-inch, shank diameter 0.095-inch, head diameter 7/32-inch. (Two (2) nails per shake). For every course of shakes, install an 18-inch-wide #30 felt shake liner.

Install Pre-Manufactured Cedar Ridge Caps on both houses.

Overlap Valley Flashing; install cedar shakes over the valley flashing leaving 4-inch gap between the edge of the wood shake and the edge of the “W” of the valley flashing.

3. Products:

a. Number 1 Grade Certi-Sawn “Tapersawn” Western Red Cedar Shakes. 18-inch long x ¾-inch thick

b. Pre-Manufactured Cedar Ridge Caps

c. 16 oz. copper flashing (valley, step, counter, drip edge)

d. 1-inch x 2-inch whitewood furring strips

e. 12-foot long 2-inch x 6-inch #2 premium grade SPF dimensional lumber

f. 15/32 -inch x 4-feet x 8-feet pine plywood sheathing

g. Ice and water shield polypropylene self-adhesive underlayment

h. 48-inch-wide rolls of synthetic roof underlayment

i. Cedar Breather Roof Ventilation Mat

j. Fasteners

4. Submittals:

A. The following items shall be submitted a minimum of 10 calendar days prior to the preconstruction conference.

a. Construction Schedule

b. Breakdown of the Schedule of Values

c. Accident Prevention/Safety Plan

d. Letter designation Project Superintendent

e. List of Subcontractors prior to notice to proceed

f. Product and Materials

i. Cedar Shakes

ii. Copper Flashing

iii. Pipe Boot Flashing

iv. Fasteners

v. Lumber

vi. Underlayment Products

vii. Roof Ventilation

viii. Joint Sealant and Caulking

5. Safety Requirements:

A. Accident Prevention Plan:

After contract award and before the Pre-Construction conference, submit for review, an Accident Prevention Plan.

B. First Aid:

Always keep an updated first aid kit on site.

C. Personnel Protective Equipment:

Meet requirements of applicable ANSI standards.

D. OSHA Standard:

Must aquotee by OSHA Standard 1926 Subpart M - Fall Protection

E. Emergency:

In case of an emergency call 911 and then notify the COR.

6. Working Hours:

All work and deliveries shall be limited to the weekday hours of 7:00 am to 4:00 pm unless otherwise approved by the COR. No work shall occur on National Park Service holidays or weekends without prior approval COR.

7. Conduct:

• Contractor workers/technicians shall always present themselves in a professional manner.

• No cursing or inappropriate language shall be used on the jobsite.

• No smoking in park owned facilities. Smoking area will be designated by the COR.

• Cigarettes shall be extinguished and placed in approve receptacle for disposal.

• No drinking or drug use is allowed on the jobsite.

8. Sanitary Facilities:

Provide and maintain temporary toilet facilities in accordance with State Health Department and National Park Service regulations. Enclosures shall be weatherproof, sight proof and of sturdy construction.

Completely remove sanitary facilities on completion of work.

9. Housekeeping:

The Contractor shall:

a. Keep the project neat, orderly, and in safe condition at all times.

b. Provide enough containers for collecting construction debris and construction materials to be recycled.

c. Keep volatile wastes in covered containers.

10. Warranty:

The contractor will provide a two-year on-call basis warranty for all work performed. The contractor will provide a written warranty stating that work executed under this contract will be free from defects of materials and workmanship for a period of two years from date of substantial completion; any material breakdown, cracking, failing off or loose, etc. will be remedied on written notice at no additional cost to the government. The warranty shall be in writing and shall be signed by the contractor. The warranty shall include the removal and replacement of materials as required for repairing any roof defect at no cost to the government.

11. Existing Conditions:

Quarters 1 Quarters 2

Damaged Rafter ½-inch Fiber Board Sheathing