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READ AND **REMOVE THIS PAGE** BEFORE PLACING

THE SPECIFICATION SECTION IN THE CONTRACT

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[DIVISION 7: THERMAL AND MOISTURE PROTECTION]{.underline}

SECTION 07318 ‑ WOOD SHAKES

USE: Furnishing and installing roofing shakes.

**NOTES TO SPECIFIER:**

A. Options within paragraphs are identified by enclosure in brackets;
blank spaces enclosed by brackets \[\_\_\_\_\_\] provide for information
to be inserted, as appropriate, to individual projects.

B. **TO AVOID CONFLICTING REQUIREMENTS AND COSTLY MISTAKES,** the
specifier must edit (delete, substitute or add to the text). The
remaining paragraphs must be renumbered.

C. DELETE FOR FINAL COPY: Notes to the Specifier, located between lines
of asterisks; all \[brackets\], [underlining]{.underline}, **boldface**,
and *italics*, within the paragraphs; and this page. (Open Reveal Codes
\[alt F3\] to do this accurately.)

D. [To Edit "(Footer B)":]{.underline} (Corel 8). **ENTIRE FOOTER SHOULD
BE BOLDED.** Click in the footer and delete the "Project Name (ftr B)"
text and replace it with the **Name of the Project (upper and lower
case)**. Replace date with current MM/YY (WITHOUT BRACKETS).

E. The Guide Specifications are intended to be continuously reviewed and
revised. User's technical comments are appreciated. Also, other related
or similar specification that are written "from scratch" that could
benefit others, or other questions can be sent to NSTC A/E Group, ST
110, or call (303) 987-6868.

**DRAWING DATA REQUIRED:**

**REQUIRED SPEC MODIFICATIONS:**

[GENERAL NOTES]{.underline}

A. Whenever entire articles, paragraphs or subparagraphs are not
applicable, the articles, paragraphs or subparagraphs should be deleted;
when necessary, reletter or renumber articles, paragraphs or
subparagraphs.

B. THIS GUIDE IS NOT INTENDED AS A SUBSTITUTE FOR READING THE ENTIRE
SECTION.

[TECHNICAL NOTES]{.underline}

A. 1.1B: Select or add applicable specification sections. Do not list
specification sections from Division 7.

B. 1.2: Select or add applicable references.

C. 4.1 and 4.2: When a \"lump sum\" Contract is used, delete the title
\"PART 4: MEASUREMENT AND PAYMENT\", and both articles from this
specification section. Measurement and payment will be addressed in Part
4 of Section 01009 or Section 01010.

**REVISIONS OF THIS SECTION:**

CSI format, editorial changes: 12/01

Metric:

Technical Update: 09/92

SECTION 07318

WOOD SHAKES

[PART 1: GENERAL]{.underline}

1.1 SUMMARY:

A. Section Includes: Providing and installing wood shakes on roof and
sidewall areas.

1.2 REFERENCES:

A. International Conference of Building Officials (ICBO):

UBC-1991 Uniform Building Code

B. Red Cedar Shingle and Handsplit Shake Bureau:

RCSHSB Certification

C. Underwriters\' Laboratories, Inc.:

UL 790-83 Safety Tests for Fire Resistance of Roof Covering Materials

1.3 QUALITY ASSURANCE:

A. Labeling Requirements: Shakes shall bear Red Cedar Shingle and
Handsplit Shake Bureau\'s official grade marked labels, and UL label
Class \"C\".

B. Failure Criteria: Not limited to the following:

1\. Roof leakage of moisture to any area under the roofing.

2\. Shakes coming loose or cracking lengthwise.

3\. Evidence of nail rust.

1.4 DELIVERY, STORAGE, AND HANDLING:

A. Delivery: Each carton of shakes shall bear the label of the Red Cedar
Shingle and Handsplit Shake Bureau attesting to in‑plant and field
inspection standards of quality.

B. Storage: Shakes shall be stored in original bundles on a platform
above ground surface, or otherwise in a clean, dry space. Protect
exterior platform storage with polyethylene film or similar material.

[PART 2: PRODUCTS]{.underline}

2.1 MATERIALS:

A. Wood Shakes ‑ Roof: No. l Handsplit and Resawn 24 inches x 3/4 inch
Heavies.

B. Wood Shakes - Sidewall: No. l Handsplit and Resawn l8 inches x 3/4
inch Heavies.

C. Nails: Nails shall be 6d hot‑dipped zinc‑coated or aluminum.

D. Felt: Weight shall be 15 lbs per square.

PART 3: EXECUTION

3.1 EXAMINATION:

A. General: Placement of required insulation and sheathing or gypsum
wallboard shall be completed in areas to receive shakes. All mechanical
and electrical installations which will protrude through shakes shall be
complete and tested adequately to insure against having to remove shakes
to correct a problem.

3.2 APPLICATION:

A. Deck Underlay: Cover roof deck with 36-inch wide strips of felt
lapped 2 inches at vertical and horizontal joints and tacked in place.

B. Shakes, Field:

1\. Apply a double starter course of shakes. Project 1‑1/2 inches past
sheathing or fascia board.

2\. Provide two 6d nails for each shake, driven at least 1 inch from
each edge and 2 inches above butt line of the following course. Do not
drive nailheads into shakes. Space shakes approximately 1/2 inch apart.

3\. ab After applying each course of shakes, 7‑1/2 inches to weather,
an18-inch wide interlay felt shall be laid over the top portion of the
shakes and extended onto the sheathing with the bottom edge positioned
15 inches above the butt.

C. Shakes, Ridges:

1\. Apply 12-inch wide strips of felt over all ridges.

2\. Install factory‑made ridge units. Weather exposure shall be the same
as for roof shakes. Double course at each end of ridge.

D. Shakes, Valleys:

1\. Apply continuous length of roofing felt over asbestos felt noted
above; 36 inch minimum.

2\. Apply 26 gauge galvanized iron sheet 20-inch minimum width center
and edge crimped, painted with primer and two coats oil base paint (dark
brown).

3\. Apply shakes to within 3 inches of center crimp each surface of roof
at ridge and trim so that edge‑to‑edge spacing of shakes at valley is
widened 1 inch in 8 ft‑0 inches toward eave.

4\. Shakes extending into the valley shall be sawed to the proper miter.
Do not break joints into valley. Do not lay shakes with grain parallel
with the center line of valleys.

E. Shakes, Exposed Eaves: All nails which protrude through the roof
decking material shall be nipped off flush with undersurface of decking.

F. Shakes, Concave Juncture, Roof to Wall:

1\. After applying final course of shakes to roof, install 8-inch wide
26 gauge g.i. flashing to cover last 4 inches of roof slope with 1/2
inch hem and bottom 4 inches of wall subsurface. Verify that flashing
covers nails which affix final course.

2\. Apply a double starter course at bottom of wall surface and proceed
up wall with shake installation as noted below.

G. Shakes ‑ Apex Juncture, Roof to Wall:

1\. Before applying final course of shakes, install 12-inch wide 26
gauge g.i. flashing to cover top 8 inches of roof and bend remaining 4
inches to cover top portion of wall.

2\. Complete roof application to cover flashing, allowing shake tips to
extend beyond juncture.

3\. Complete wall application, trimming last courses to fit snugly under
protective roof shakes.

4\. Apply molding strip to cover topmost portion of walls and trim roof
shakes even with outer surface of molding.

5\. Apply conventional shake \"ridge\" across top edge of roof in a
single strip without matching pairs.

H. Chimney Flashings: Run up not less than 6 inches under the shakes and
if of galvanized iron shall be backed up with non‑drying bituminous
mastic where they come in contact with brick. Counter flashings shall
extend to within 1 inch of the surface of the finished roof.

I. Apron Flashings: Extend to within 1 inch of the surface of the
finished roof.

J. Saddles or Crickets: Flashing shall be carried not less than 10
inches under the shakes.

K. Step Flashings: Used where vertical surfaces occur in connection with
slopes. They shall be formed of separate pieces; shall turn up not less
than 4 inches at any point; shall be built into the masonry; shall lap
generally 3 inches but in no case less than 2 inches; shall not be
soldered; shall follow the joints of masonry, and shall be installed in
reglets cut into these joints.

L. Dormer Flashings: Run up not less than 6 inches under the shakes and
at least 8 inches up on the face and cheeks.

M. Cap Flashing: Extend up under the shakes of the sidewalls or other
outside finish for a distance of at least 6 inches.

N. Projecting Pipes: Flash and counter flash. These flashings shall
extend out on the roof, not less than 6 inches. They shall be of
sufficient length to cover the shake course next below the pipe, and to
extend up under the straight course above as far as possible without
being punctured by nails. Where plumbing vents are carried through roof
surfaces, flash with lead.

O. Foundation: Sidewall shakes shall be doubled at foundation lines and
projected 1 inch past bottom edge of sheathing.

P. Joints: Joints in any one course shall be not less than 1‑1/2 inches
away from the joints in adjacent courses, and shall be spaced apart not
more than 1/2 inch.

Q. Exposure: Sidewall shakes shall be applied with a weather exposure of
8 inches.

R. Field, Single Coursed:

1\. Provide two 8d nails for each shake driven at least 1 inch from each
side edge and 1 inch above butt line of the following course. Do not
drive nailheads into shakes.

2\. After applying each course of shakes, an 18-inch wide strip of 30 lb
roofing felt shall be laid over the top portion of the shakes and
extended onto the sheathing with the bottom edge positioned about 12
inches above the butt.

S. Corners:

1\. Outside corners shall be constructed with an alternate overlap of
shakes between successive courses.

2\. Inside corners shall be mitered over 26 gauge galvanized iron metal
flashing 12 inches wide, center CRIMPED.

T. Top of Wall and Horizontal Break of Plane in Wall Surface: Before
applying final course of shakes at top of wall plane, install 26 gauge
galvanized iron to cover top of wall surface and parapet. See drawing
details for required flashing configuration.

U. Convex Juncture - Wall to Roof:

1\. After applying final course of shakes at top of wall, install 8-inch
wide metal flashing to cover top of wall surface (with 1/2-inch hem) and
bottom 4 inch or roof subsurface. Bend carefully to avoid fracturing.
Verify that flashing covers nails which affix final course.

2\. Apply a double starter course at eave, allowing 1-1/2 inch over hand
of wall surface, and proceed with installation up roof slope as
specified above.

[PART 4: MEASUREMENT AND PAYMENT]{.underline}

4.1 METHOD OF MEASUREMENT:

A. Units: The work described in this section will not be measured for
payment.

4.2 BASIS OF PAYMENT:

A. Payment: No direct payment for the work described under this section
will be made. Contractor shall include consideration for this item in
the bid price for other items of the Contract.

END OF SECTION