061519 Timber Decking.DOC

DIVISION 6

SECTION 061519

WOODS & PLASTICS

TIMBER DECKING

Revise this Section by deleting and inserting text to meet Project-specific requirements.

This Section uses the term "Architect." Change this term to match that used to identify the design professional as defined in the General and Supplementary Conditions.

Verify that Section titles referenced in this Section are correct for this Project's Specifications; Section titles may have changed.

PART 1 - GENERAL

1.1 SUMMARY

A. Section Includes:

1. Wood decking.

2. Railings for elevated decks.

3. Support framing for elevated decks.

1.2 ACTION SUBMITTALS

A. Product Data: For preservative-treated wood products and metal framing anchors.

1.3 INFORMATIONAL SUBMITTALS

A. Material Certificates:

Delete first subparagraph below if species and grade are indicated for each use.

1. For lumber specified to comply with minimum allowable unit stresses. Indicate species and grade selected for each use and design values approved by ALSC's Board of Review.

2. For preservative-treated wood products. Indicate type of preservative used and net amount of preservative retained.

B. Evaluation Reports: For the following, from ICC-ES:

Revise list below to retain only those products retained in Part 2.

1. Preservative-treated wood products.

2. Metal framing anchors.

3. Decking fasteners.

PART 2 - PRODUCTS

See Editing Instruction No. 1 in the Evaluations for cautions about named manufacturers and products. For an explanation of options and Contractor's product selection procedures, see SECTION 016000 "Product Requirements."

2.1 LUMBER, GENERAL

A. Comply with DOC PS 20 and with grading rules of lumber grading agencies certified by ALSC's Board of Review as applicable. If no grading agency is indicated, comply with the applicable rules of any rules-writing agency certified by ALSC's Board of Review.

1. Factory mark each item with grade stamp of grading agency.

Retain first option in first subparagraph below if authorities having jurisdiction require grade stamps on all materials.

2. For items that are exposed to view in the completed Work, mark grade stamp on end or back of each piece.

3. Provide dressed lumber, S4S, unless otherwise indicated.

B. Maximum Moisture Content:

1. Boards: 15 percent.

2. Dimension Lumber: 19 percent.

3. Timber: 19 percent.

2.2 WOOD DECKING

Retain one of two "Dimension Lumber Decking( and Stair Treads)" paragraphs below for 2-by-4 and 2-by-6 decking.

A. Dimension Lumber Decking: Pine.

2.3 WOOD RAILINGS

A. Railings shall be natural pine logs, peeled, and unfinished.

2.4 DIMENSION LUMBER FRAMING

A. Joists and girders shall be Douglas Fir No. 2 unless otherwise shown on the drawings.

2.5 POSTS

Retain "Dimension Lumber Posts" Paragraph below for posts 4 by 4 inches nominal (89 by 89 mm actual). Posts 6 by 6 inches nominal (140 by 140 mm actual) and larger are timber rather than dimension lumber.

Retain one of three "Timber Posts" paragraphs below for rectangular posts 6 by 6 inches nominal (140 by 140 mm actual) and larger.

A. Timber Posts: Natural pine, peeled, and unfinished.

2.6 PRESERVATIVE TREATMENT

A. Pressure treat boards and dimension lumber with waterborne preservative according to AWPA U1 or as shown on the drawings; use Category UC3b for exterior construction not in contact with the ground, and Category UC4a for items in contact with the ground.

B. Pressure treat timber with waterborne preservative according to AWPA U1; Use Category UC4a.

See Evaluations for information about treatment chemicals.

C. Preservative Chemicals: Acceptable to authorities having jurisdiction.

1. Do not use chemicals containing arsenic or chromium, except for timber posts.

Usually retain one of first two paragraphs below.

D. Use process that includes water-repellent treatment.

E. Use process that does not include water repellents or other substances that might interfere with application of indicated finishes.

Revise options in first paragraph below to eliminate items for which treated kiln-dried wood is not required.

F. After treatment, redry boards, dimension lumber, and timber to 19 percent maximum moisture content.

G. Mark treated wood with treatment quality mark of an inspection agency approved by ALSC's Board of Review.

Retain first option in subparagraph below if authorities having jurisdiction require quality mark on all materials.

1. For items indicated to receive a stained or natural finish, mark each piece on surface that will not be exposed or omit marking and provide certificates of treatment compliance issued by inspection agency.

Retain first option in "Application" Paragraph below and delete subparagraphs if total treatment is required; otherwise, retain second option and applicable subparagraphs.

H. Application: Treat items indicated on Drawings.

2.7 FASTENERS

A. General: Provide fasteners of size and type indicated, acceptable to authorities having jurisdiction, and that comply with requirements specified in this article for material and manufacture. Provide nails or screws, in sufficient length, to penetrate not less than 1-1/2 inches (38 mm) into wood substrate.

1. All fasteners to be stainless steel.

PART 3 - EXECUTION

3.1 INSTALLATION, GENERAL

A. Set work to required levels and lines, with members plumb, true to line, cut, and fitted. Fit work to other construction; scribe and cope as needed for accurate fit.

B. Framing Standard: Comply with AF&PA WCD1 unless otherwise indicated.

C. Install wood decking with crown up bark side down.

Retain options for acceptable fastening methods in first paragraph below, or delete paragraph to allow Contractor to use any method acceptable to authorities having jurisdiction.

D. Secure decking to framing with screws.

E. Do not splice structural members between supports unless otherwise indicated.

Delete first paragraph below for southern pine.

F. Apply copper naphthenate field treatment to comply with AWPA M4, to cut surfaces of preservative-treated lumber.

G. Securely attach exterior rough carpentry work to substrate by anchoring and fastening as indicated, complying with the following:

If retaining first subparagraph below, verify that evaluation report is acceptable to authorities having jurisdiction.

1. ICC-ES AC70 for power-driven fasteners.

Retain one of two subparagraphs below, with or without subparagraph above.

2. "Fastening Schedule" in ICC's International Building Code.

3.2 RAILING INSTALLATION

Descriptive requirements in this article cover basic railing installation only; supplement with complete details.

A. Railings: Secure with countersunk-head wood screws or rail bolts.

END OF SECTION 061519

LFO BLM Cottonwood Foot Bridges Repair Project 061519- 1