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Woodcrest® & Woodmoor® Installation Instructions | Owens Corning Roofing
Owens Corning

CAUTION: DO NOT MIX MATERIAL BEARING DIFFERENT LOT NUMBERS, REFER TO THE LOT NUMBERS LOCATED ON THE SIDE OF THE BUNDLE

These shingles can be installed with a 5 inch & 5 inch offset application OR with the traditional 5 inch & 15 inch offset application. 

Application Instructions

  • Before installing this product, check local building codes for roofing requirements.
  • These laminated shingles are designed for new or reroofing work over any properly built and supported wood roof deck having adequate nail holding capacity and a smooth surface. Check local building codes regarding deck load limits. Because Owens Corning® Woodcrest®/Woodmoor® Shingles are 350/465 avg. wt./sq. respectively, it must be determined if the roof structure can support workers and the weight of the shingles. It may not be feasible to apply the product over an existing shingle roof.

Precautionary Note

The manufacturer will not be responsible for problems resulting from any deviation from the application instructions and the following precautions:

  • Roof Top Loading: Lay shingle bundles flat. Do not bend over the ridge.
  • Cold Weather Installation (Below 40F): All field shingles must be installed with an approximate 1/16 inch – 1/8 inch gap on all end/butt joints.

    This ensures that any expansion of the shingles which may occur in warmer weather will not cause the shingles to buckle against one another. 

    All shingles installed on the perimeter of the roof must be hand-sealed with four 1 inch dabs of ASTM D4586-compliant asphalt cement. See Fig. 4A

    This protects against wind uplift which may occur when the temperature is too low for the adhesive strip of the shingles to activate. 
  • Roof Deck: Minimum 6 inch roof deck boards, minimum 3/8 inch plywood, minimum 7/16 inch OSB, sheathing spaced minimum 1/8 inch and maximum 1/4 inch. Regardless of deck type used, the roofing installer must:
  1. Install the deck material in strict compliance with the deck manufacturer’s instructions.
  2. Prevent the wood deck from getting wet before, during and after installation.
  • Ventilation: Must comply with local building codes.
  • Handling: Use extra care in handling shingles when the temperature is below 40°F.
  • Storage: Store in a covered, ventilated area at a maximum temperature of 110°F. Bundles should be stacked flat. Do not store near steam pipes, radiators, etc.
  • Fastener Requirement: Use galvanized steel, stainless steel or aluminum nails minimum 12 gauge shank with 3/8 inch diameter head. Owens Corning Roofing recommends that fasteners comply with ASTM F1667. Must comply with local building codes. All Fasteners must penetrate at least 3/4 inch into the wood deck or completely through the deck by a minimum of 1/4 inch.

Notice: Owens Corning Roofing requires the use of nails as the method of attaching shingles to wood decking.

Diagram of properly driven vs. improperly driven fasteners

Step 1:

Self-Adhered Ice & Water Barrier

Use an Owens Corning® Self-Adhered Ice & Water Barrier on the eaves in all regions of the country where roofs have had a history of water backup due to ice dams. Apply starting at the eaves edge and extend upslope a minimum of 24 inches from the interior wall line, measured vertically. Follow underlayment manufacturer’s installation instructions and local building codes. Most applications will require 2 courses of self-adhered underlayment. See Fig. 1.

Fig. 1

Step 2:

Synthetic Underlayment

Standard Slopes 4:12 and Greater: Use an Owens Corning®, RhinoRoof®, or Titanium® Synthetic Underlayment or equivalent underlayment meeting ASTM D226, D4869, D8257, or D6757. Follow underlayment manufacturer’s application instructions and local building codes. See Fig. 2.

Fig. 2

Step 3:

Synthetic Underlayment

Low Slope 2:12 to Less than 4:12: Use an Owens Corning® Synthetic Underlayment or equivalent underlayment meeting ASTM D226, D4869 or D6757. Underlayment must be installed per the manufacturer's application instructions and local building codes. Each underlayment course must be overlapped a minimum of 1/2 the width of the underlayment plus 1 inch. See Fig. 3.

Option 2: Install Owens Corning® Self-Adhered Ice & Water Barrier or equivalent with a standard overlap of 3 inches. See Fig. 3A.

Fig. 3 and 3A

Step 4:

Shingle Fastening Pattern

Fasteners must be placed in the nail area. See Fig. 4.

Standard Fastening Pattern:

Use 5 fasteners. See Fig. 4.

Fig. 4

Mansard or Steep Slope Fastening Pattern

See Fig. 4A.

REQUIRED: For slopes exceeding 60 degrees or 21 inches per foot, 9 nails are required with 5 in the nail area and 4 placed above tab cutouts. Center asphalt roof cement 2 inches up from bottom edge of shingle tab. See Fig. 4A.

  1. Position the first course shingle applying 5 nails in the nail area.
  2. Temporarily position the second course shingle above to determine the location for the additional 4 fasteners.
  3. Apply one 1 inch diameter spot of asphalt roof cement under each shingle tab.
  4. Apply all succeeding shingle courses in the same manner.

Asphalt Roof Cement where required must meet ASTM D4586 Type I or II (Asbestos Free).

Note: Please be aware that excessive amounts of asphalt roof cement could blister the shingle.

Fig. 4A

Starter Course

Caution: Use only Owens Corning® WoodStart® at the eaves and Starter Strip Plus on the rakes.

Left Rake Application: Cut 35 inches off from the first starter piece. Fasten the remaining 5 inches x 13 3/8 inch to the deck as shown in Fig. 5, followed by a full 13 3/8 inch x 40 inches starter piece to the deck with 5 fasteners as shown.

Right Rake Application: Cut 5 inches off from the first bottom starter piece. Fasten the remaining 35 inches x 13 3/8 inch to the deck as shown in Fig. 5, followed by a full 13 3/8 inch x 40 inches starter piece to the deck with 5 fasteners as shown.

Fig. 5

Step 5:

Measurement Area

When aligning for offset pattern, measure from Area A or Area B. See Fig. 6.

Fig. 6

Step 6:

Shingle Application

Owens Corning® Woodcrest®/Woodmoor® Shingles can be applied with a 5 inch & 5 inch OR 5 inch & 15 inch offset, with 4 inch exposure. See Fig. 6. Shingles can be installed from either left or right rake edge.

5 inch & 5 inch Course Application

First Course: Start with a full shingle even with the lower edge of the starter course shingle. See Fig. 7.

Second Course: Cut 5 inches from a full shingle. Install the remaining 35 inch piece using the alignment notch on the shingle. See Fig. 7.

Third through Eighth Courses: Cut and install remaining courses. See Fig. 7.

Fig. 7

5 inch & 15 inch Course Application

First Course: Start with a full shingle even with the lower edge of the starter course shingle. See Fig. 8.

Fig. 8

Second Course: Cut 5 inches from a full shingle. Install the remaining 35 inch piece using the alignment notch on the shingle. See Fig. 8A.

Fig. 8A

Third Course: Cut 20 inches from a full shingle. Install the remaining 20 inch piece using the alignment notch on the shingle. See Fig. 8B.

Fig. 8B

Fourth Course: Cut 25 inches from the edge of the fourth course full shingle. Install the remaining 15 inch piece using the alignment notch on the shingle. See Fig. 8C.

Fig. 8C

Succeeding Courses: For succeeding courses, repeat first through fourth course. See Fig. 8D.

Fig. 8D

Step 7:

Valley Construction

Open Valley:

Owens Corning® Woodcrest® and Woodmoor® Shingles must be installed using open valley construction; woven and closed-cut valley methods are not permitted.

  • Lay a 36 inch wide valley liner of Owens Corning® Self-Adhered Ice & Water Barrier or equivalent. A 36 inch wide minimum 50 lb. smooth surface roll roofing can also be used as a valley liner. Fasten on outer edges only a minimum of 6 inches away from center line on each side of valley. See Fig. 9.
  • Recommended valley flashing is 24 inches wide 26-gauge galvanized metal or an equivalent corrosion-resistant, non-staining material. Secure the valley metal to the roof deck along each edge with fasteners spaced 8 to 12 inches apart. Overlaps should be 12 inches and cemented. See Fig. 9.
  • Snap a chalk line on each side of the valley centerline over the full length of the valley flashing. Space the chalk lines 6 inches apart at the ridge (3 inches to either side of the valley centerline). The lower ends of the chalk lines should diverge from each other 1/8 inch per foot (i.e., for an 8 foot valley, the chalk lines will be 7 inches apart at the eaves). See Fig. 9A.
  • As the shingles are applied toward the valley, the last shingle in each course will be trimmed to fit on the chalk line. Note: Do not use a shingle less than 12 inches in length to finish a course running into a valley. If necessary, trim a tab off the adjacent shingle in the course to allow a longer portion to be used.
  • Clip 1 inch from the upper portion of the shingle on a 45° angle to divert water into the valley. See Fig. 9A.
  • Cement the shingle to the valley lining with a 3 inch wide band of asphalt plastic cement conforming to ASTM D4586 Type I or II (Asbestos Free). See Fig. 9A.
Fig. 9 and 9A

Step 8:

Step Flashing

Use 8 inch x 6 inch corrosion-resistant metal where roof planes butt against vertical sidewalls or chimneys. Do NOT fasten flashing to vertical wall surface. See Fig. 10.

Fig. 10

Step 9:

Hip & Ridge Application

Use corresponding Owens Corning® Hip & Ridge Shingles to best complement shingle color. Follow specific application instructions as printed on the Hip & Ridge Shingle package.

Contact Us

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