A04 40511397 SOW.pdf

SUPPLY TRUSSES 1 | P a g e

CANYONLANDS NATIONAL PARK 162267

National Park Service Canyonlands National Park

Project: Supply Trusses

Delivery Location: Island in the Sky – Residence B14

October 2020

PROJECT SPECIFICATIONS

PART 1 GENERAL

1.1 DESCRIPTION AND REQUIREMENTS

A. Synopsis

Supply and deliver new engineer designed wood trusses for construction of a 5,000 square foot residential building to be performed by Park personnel.

B. Location

Products shall be delivered to Canyonlands National Park, Island in the Sky District (ISKY) residential area, site B14. This is located 32 miles from Moab, UT 84532, traveling southwest on State Route 313. State Route 313 is accessed from U.S. Highway 191, either traveling 10 miles north of Moab or 20 miles south of Interstate 70 exit 182 at Crescent Junction.

Residence B14 is located approximately 1,200 feet west of the ISKY Visitor Center.

Turn west (right) on the service road just north of the Visitor Center towards the residential area to residence B14, the first driveway to the right at the bottom of the hill.

C. Period of Performance

The period of performance for this project is 45 calendar days from notice to proceed.

D. Warranty

The warranty shall be the standard manufacturer’s warranty ensuring the product is in good condition and meets the specifications upon delivery.

E. Submittals to be provided after Contract Award

• Provide shop drawings for NPS review and approval before production.

• Provide Professional Structural Engineer stamped final truss production plans after approval.

SUPPLY TRUSSES 2 | P a g e

F. Delivery days and hours.

Delivery shall be performed between 8:00 AM to 3:00 PM Monday through Thursday.

No Friday, weekend or Federal Holiday deliveries will be allowed without prior approval. A telehandler forklift is available for unloading materials. The residence area has enough access space for a semi-tractor with a short trailer.

Contact Eric McDougall at (435) 719-2157 with at least one week notice to arrange delivery.

PART 2 PRODUCTS

2.1 REQUIRED SALIENT FEATURES OF ENGINEERED TRUSSES

A. Truss Design

1. Governing Codes

a) IBC 2018 Ed.

b) IRC 2018 Ed.

c) ASCE 7-16.

2. Loads (see Plan Sheet S1)

a) Roof Dead Load = 20 psf.

b) Roof Live Load = 20 psf, construction load.

c) Snow Load = 32 psf.

1) Exposure Factor, Ce = 1.00.

2) Thermal Factor, Ct = 1.00.

3) Importance Factor Is = 1.00.

d) Wind – ASCE 7-16

1) Mean Roof Height = 15 ft.

2) Ultimate Design Velocity = 115 mph (3 second gust)

3) Exposure Category = C.

4) Topography Factor = 1.0.

e) Rooftop HVAC Unit (See Plan Sheet S9)

1) Live Load = 40 psf in shaded area

2) Dead Load = 15 psf in shaded area (curb weight)

3) Rooftop Unit Weight = 500 lbs.

3. Parameters:

a) Roof Pitch: 4:12

b) Tail Overhang: 6’ – 0”

c) Spacing: 2’ - 0” on center.

d) Top Chord: 19/32 – inch OSB roof sheathing to be directly fastened.

e) Bottom Chord: 5/8 - inch gypsum board ceiling to be directly fastened.

f) End and Wing Gables

1) Drop top chord 1½ – inches for lookout framing to rest directly upon gable truss.

SUPPLY TRUSSES 3 | P a g e

2) Web Spacing: 16 or 24 inches on center.

g) HVAC Ductwork

1) Provide consistent truss web spacing to allow rigid horizontal ductwork runs as indicated in plan sheets M2 and M3.

B. Truss Dimensional Framing Lumber

1. Allowable Species: Spruce, Pine, Fir, Douglas Fir, classified by Western Wood

Products Association (WWPA) or Pacific Lumber Inspection Board (PLIB).

2. Moisture Content: the lumber shall have a maximum moisture content of 19% or less.

3. Grades: per American Softwood Lumber Standard (ALSC) PS 20.

a) Machine Stress Rated: 1650F 1.5E (typ.) or better as required for trusses to resist the additional Roof Top Unit mechanical loads.

4. Facing

a) Dimensional lumber size is nominal (i.e.: 2 x 4 = 1.5” x 3.5” typ.) and shall be surfaced four sides, S4S.

SUPPLY TRUSSES 4 | P a g e

PART 3 EXECUTION

A. Delivery

1. Protect all truss packages from moisture during transit.

2. Load and unload truss packages taking care to minimize product damage.

3. Set all truss packages upon lumber dunnage resting on level, well drained surfaces.

PART 4 MEASUREMENT AND PAYMENT

A. Measurement and payment will be made according to the bid schedule.