074624.pdf

06-09-23

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SECTION 074624 - WOOD SHINGLE AND SHAKE SIDING

PART 1 - GENERAL

1.1 SUMMARY

A. Section Includes:

1. Undercoursing.

2. Wood shake siding.

B. Related Requirements:

1. Section 062013 "Exterior Finish Carpentry" for wood exterior-wall trim.

2. Section 072500 "Weather Barriers" for weather-resistive barriers and flexible flashing.

3. Section 073129 "Wood Shingles and Shakes" for wood shingle and shake roof coverings.

4. Section 076200 "Sheet Metal Flashing and Trim" for metal flashing and trim installed with siding.

1.2 PREINSTALLATION MEETINGS

A. Preinstallation Conference: Conduct conference at Project site.

1.3 ACTION SUBMITTALS

A. Product Data:

1. Undercoursing.

2. Wood shake siding.

B. Samples for Initial Selection: For each type of siding product with factory-applied finishes.

C. Samples for Verification: For the following products, of sizes indicated, to verify color and finish selected.

1. Wood Shakes: Full-size unit.

1.4 INFORMATIONAL SUBMITTALS

A. Qualification Statements: For Installer.

B. Sample warranties.

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1.5 CLOSEOUT SUBMITTALS

A. Maintenance Data: For siding to include in maintenance manuals.

1.6 MAINTENANCE MATERIAL SUBMITTALS

A. Extra Stock Material: Furnish extra materials, from the same production run, to Owner that match products installed and that are packaged with protective covering for storage and identified with labels describing contents.

1. Wood Shakes: 100 sq. ft. (9.3 sq. m) of each type, finish, and color in unbroken bundles.

1.7 QUALITY ASSURANCE

A. Installer Qualifications: CSSB member.

B. Grading Agency Qualifications: An independent testing and inspecting agency recognized by authorities having jurisdiction as qualified to label siding for compliance with referenced grading rules.

1.8 MOCKUPS

A. Build mockups to set quality standards for fabrication and installation.

1. Build mockups for siding including accessories.

a. Size: [48 inches (1200 mm) long by 48 inches (1200 mm) wide] <Insert dimensions>.

2. Approval of mockups does not constitute approval of deviations from the Contract Documents contained in mockups unless Owner specifically approves such deviations by Change Order.

3. Subject to compliance with requirements, approved mockups may become part of the completed Work if undisturbed at time of Substantial Completion.

1.9 DELIVERY, STORAGE, AND HANDLING

A. Store siding in a dry, well-ventilated, weathertight location in accordance with manufacturer's written instructions.

B. Store rolls of felt used for weather-resistive barrier on end, and on pallets or other raised surfaces. Do not double stack rolls.

1. Protect unused felt from weather, sunlight, and moisture when left overnight or when work is not in progress.

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1.10 FIELD CONDITIONS

A. Environmental Limitations: Proceed with installation only when existing and forecasted weather conditions permit siding installation and related Work to be performed in accordance with manufacturer's written instructions and warranty requirements.

1. Field-Finished Siding: Proceed with installation of siding only when existing and forecast weather conditions permit installation and immediate application of at least one coat of specified finish on siding before it is exposed to rain, snow, or dampness.

a. Proceed with installation only after base or primer coat has been applied to every surface of siding units and has dried.

1.11 WARRANTY

A. Materials Warranty: Manufacturer's warranty administered by CSSB and on CSSB's standard form in which manufacturer agrees to repair or replace CSSB-labeled products that fail in materials within specified warranty period. Material failures include manufacturing defects that result in leaks.

1. Warranty Period: 25 year(s) from date of Substantial Completion.

PART 2 - PRODUCTS

2.1 SOURCE LIMITATIONS

A. Obtain each type of product from single source from single manufacturer.

2.2 PERFORMANCE REQUIREMENTS

A. Fire Resistance: Provide wood products that are fire-retardant treated in accordance with AWPA U1, pressure treated in closed vessels under pressures of not less than 50 psig (345 kPa), and as follows:

1. Surface-Burning Characteristics: In accordance with ASTM E84; tested by a qualified testing agency acceptable to authorities having jurisdiction, as follows:

a. Flame-Spread Index: 25or less.

b. Progressive Combustion: No evidence of significant progressive combustion when the test is continued for an additional 20-minute period.

c. Flame Front: Does not progress more than 10-1/2 ft. (3.2 m) beyond the centerline of burners at any time during the test.

d. Effect of Weathering: No increase in the listed classification when subjected to accelerated weathering in accordance with ASTM D2898, Method A.

2. Product Identification: Attach a label to each bundle of wood products that includes the following:

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a. Identification mark of testing agency acceptable to authorities having jurisdiction.

b. Identification of treating manufacturer, chemical treatment, method of application, purpose of treatment, and warranties available.

c. Species of wood.

d. Flame-spread and smoke-developed indexes.

e. Method of drying after treatment.

f. The words "No increase in the listed classification when subjected to the Standard

Rain Test."

g. References to model-code approval.

B. Decay Resistance: Provide wood products that are preservative treated in accordance with AWPA U1, chromated copper arsenate pressure treatment; with a minimum of 0.40 lb/cu. ft.

(6.4 kg/cu. m) retention.

1. Identification: Attach a label to each bundle of wood products; identify manufacturer and include chemical treatment, method of application, purpose of treatment, and warranties available.

C. Grading Rules: Provide siding that complies with CSSB's grading rules for products indicated.

1. Identification: Attach a label to each bundle of siding; identify manufacturer, type of product, grade, dimensions, and identification mark of grading agency.

2.3 UNDERCOURSING

A. Cedar Undercoursing Shingles: Smooth-sawn western red cedar shingles.

1. Size: Length matching siding and in manufacturer's standard thickness

2. Grade: No. 4, Undercoursing.

3. Finish: Match siding

2.4 WOOD SHAKE SIDING

A. Split Cedar Shakes: Hand-split and resawn western red cedar shakes; split face and sawn back.

1. Grade: No. 1.

2. Length: 18 inches (457 mm)

3. Thickness: 1/2 inch (13 mm) at butt.

2.5 ACCESSORIES

A. Felt Weather-Resistive Barrier: ASTM D226/D226M Type II or ASTM D4869/D4869M Type III, asphalt-saturated organic felt, nonperforated.

B. Ventilated Underlayment: Three-dimensional, nylon mat.

C. Nails: ASTM F1667, stainless steel, Type 316, wire nails, sharp pointed, and of sufficient length to penetrate a minimum of 3/4 inch (19 mm) into sheathing.

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1. Cedar: Use box nails.

2. Felt Weather-Resistive Barrier: Use roofing nails.

3. Nails in Contact with Metal Flashing: Use nails made from same metal as flashing or made from metal compatible with metal flashing.

D. Wood-Shingle-Clad Panel Fasteners: As recommended in writing by manufacturer

PART 3 - EXECUTION

3.1 EXAMINATION

A. Examine substrates, areas, and conditions, with Installer present, for compliance with requirements for installation tolerances and other conditions affecting performance of the Work.

B. Prepare written report, endorsed by Installer, listing conditions detrimental to performance of the Work.

C. Proceed with installation only after unsatisfactory conditions have been corrected.

3.2 INSTALLATION OF FELT WEATHER-RESISTIVE BARRIER

A. Comply with felt manufacturer's written installation instructions and CSSB written recommendations applicable to products and applications indicated unless more stringent requirements apply.

B. Cover exposed exterior surface of sheathing with felt nailed to framing immediately after sheathing is installed.

1. Apply horizontally with a 2-inch (51-mm) overlap and a 6-inch (152-mm) end lap. Wrap around inside and outside corners 4 inches (102 mm).

2. Cut back felt 1/2 inch (13 mm) on each side of the break in supporting members at expansion- or control-joint locations.

3. Apply felt to cover vertical flashing with a minimum 4-inch (102-mm) overlap unless otherwise indicated.

3.3 INSTALLATION OF FLEXIBLE FLASHING

A. Apply flexible flashing to comply with manufacturer's written installation instructions.

1. Prime substrates as recommended by flashing manufacturer.

2. Lap seams and junctures with other materials at least 4 inches (102 mm) except that at flashing flanges of other construction, laps need not exceed flange width.

3. Lap flashing over felt weather-resistive barrier at bottom and sides of openings.

4. After flashing has been applied, roll surfaces with a hard rubber or metal roller to ensure that flashing is completely adhered to substrates.

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3.4 INSTALLATION OF SINGLE-COURSED WALLS

A. Install products in accordance with manufacturer's written instructions and recommendations in CSSB's "Exterior and Interior Wall Manual."

B. Install products, beginning at base of wall.

C. Starter Undercourse: Install single course of undercoursing at base of wall in a continuous straight line.

1. Space undercoursing shingles with at least 1/4-inch (6-mm) keyway.

2. Match fastening and corner treatment of siding.

D. Wood Siding:

1. Install starter (first) course of siding over starter undercoursing with butts 1/2 inch (13

mm) lower than undercoursing butts.

2. Offset joints in first course of siding a minimum of 1-1/2 inches (38 mm) from joints in starter undercoursing.

3. Install succeeding siding courses with joints offset a minimum of 1-1/2 inches (38 mm) between adjacent courses.

4. Install siding courses with butt lines staggered 1 inch (25 mm)

5. Fasten each unit with two concealed nails spaced 3/4 to 1 inch (19 to 25 mm) from edges and 1 inch (25 mm) above butt line of succeeding course.

a. Drive fasteners flush with top surface of units without crushing wood.

b. For shingles wider than 10 inches (254 mm), install two additional concealed fasteners, spaced 1 inch (25 mm) apart, at the center of unit.

6. Interior Corner Treatment: Butted against wood stop

7. Exterior Corner Treatment: Laced.

E. Weather Exposure and Spacing:

1. Wood Shake Siding:

a. Maintain weather exposure of 8 inches (203 mm) for 18-inch- (457-mm-) long shakes.

b. Space shakes with 3/8- to 1/2-inch (10- to 13-mm) keyway.

END OF SECTION 074624