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Design and Application Instructions
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Re-walling
Once the old exterior wall material has been removed and the old nails or other protrusions cleaned away, the new wall can be applied. Type 30 felt underlayment should be applied since it is new construction.
Over-walling
Applying Certi-label™ Western Cedar shingles or shakes right over an old wall - whether wood, brick, stucco, or synthetic products - is easily done. It saves time involved in both removing the old exterior and in disposing of it. However, avoid nailing over vinyl or aluminum as they are not sufficiently strong to provide a proper support.
First, nail moulding strips on the face of existing window and door casings, flush with the outer edges. The Certi-label™ Western Cedar shingles or shakes are then joined to the mouldings (Figure 12).
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Over Beveled Siding
Applying a new Certi-label™ Western Cedar shingle or shake wall over old beveled siding can be accomplished in either of two ways: 1) By filling in the low points of the wall with low grade lumber or plywood strips (called horse feathers) of appropriate thickness and thereby increasing the potential nailing surface, or 2) by nailing the Certi-label™ Western Cedar shingles or shakes to the high points of the bevels of each course of the old wall, or of alternate courses (provided it does not result in weather exposure greater than is recommended (Figure 13).
Ensure that the first course is properly attached. All Certi-label™ Western Cedar shingle and shake product installation must meet nailing and exposure guidelines as detailed in this manual. It may be necessary to add occasional nailing strips.
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Over Masonry
Masonry walls are easily covered, by vertically furring the walls and applying nailing strips (1 x 3 or 1 x 4) spaced according to the exposure and single/double course product design. The nailing strips should be fastened with special nails, driven between the bricks or blocks, so that the outer shingled wall will be firmly attached (Figure 14).
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Over Stucco
Nailing strips should be attached with nails long enough to penetrate the stucco and the underlying sheathing. Do not apply directly to the stucco, which is too weak to provide a proper support. If the old stucco is removed, new Type 30 felt underlayment is then applied to the walls, and the shingling can proceed as in new construction (Figure 15).
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