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N <br /> 5. SPECIAL INSTALLATION PROCEDURES <br /> SPECIAL INSTALLATION PROCEDURES No. 3 <br /> REMOVALIROOF LAYERS/NEW FRAMING <br /> EXISTING ROOF A <br /> WOOD SHAKE <br /> REMOVING EXISTING ROOF <br /> (50 x 50 nm) 2 x 2— MATERIAL <br /> (25 x 100mm) 1 x 4 COUNTERBATTEN Special circumstances may require <br /> (5o x 50mm)z x 2 removal of the existing roof. Underlays <br /> (2s x 100mm) 1 xa and/or sheathing may be required. Check <br /> with local building official for approval. <br /> All existing roofing material must be <br /> removed including flashings, valleys, and <br /> FASCIA BUI D-UP ;, battens. Thoroughly examine the roof <br /> FLUSH structure and replace any lumber that <br /> shows decay or damage. Gerard panels <br /> can be installed over open/spaced or solid <br /> sheathing. If solid sheathing is specified, <br /> use a minimum 1h' (12mm) CDX type of <br /> plywood. When solid sheathing is not <br /> used, but the existing spaced sheathing <br /> will remain, 1 X 4 (25 X 100 mm) <br /> EXISTING ROOF B counterbattens are installed as for re- <br /> WOOD SHINGLE roofing. Refer to the'Re-Roofing'section. <br /> ROOF LAYERS <br /> A Gerard roof can be applied over a <br /> maximum of two(2)roof layers.' If there are <br /> more than two(2)layers of existing roofing <br /> (50 x 50mm)2 x remove the layer'(s) until two layers exist. <br /> (25 x 100mm) 1 x 4 COUNTERBATTEN Example: <br /> (25 x loam)1 x 4 Q Top layer =Gerard <br /> Middle layer =Wood Shake <br /> Bottom layer =Wood Shingle <br /> FASCIA BUILD-UP 'Check Local building codes <br /> FLUSH 4, INSTALLING NEW FRAMING FOR <br /> DIFFERENT ROOF MATERIALS <br /> PURPOSE: <br /> To aid in the installation of Gerard tiles <br /> when encountering different materials, <br /> EXISTING ROOF <br /> C situations,and roof designs. <br /> ASPHALT/FIBERGLASS PROCEDURES <br /> COMPOSITION SHINGLES AND Different roof materials require a different <br /> ROCK fascia build-up. The following examples <br /> are typical when re-roofing with Gerard. <br /> A. WOOD SHAKE <br /> Typically,a 4'to 5'(100 to 125mm)build- <br /> up is required and consists of the <br /> following: <br /> (50 x sawn)2 x i X 4,and/or 2 X 2,1 X 4,&2 X 2(25 X 100, <br /> (25x100—) 1 x 4 COUNTERBATTEN{ 50 X 50,25 X 100,50 X 50mm). (See III.) <br /> i.T <br /> B. WOOD SHINGLE <br /> Typically a 2'to 3' (50 to 75mm)build-up <br /> is required and consists of the following: <br /> FASCIA BUILDuP 1 X.4, 1 X 4,&2 X 2 (25 X 100,25 X 100, <br /> FLUSH 50 X 50mm). (See III.) <br /> GENERAL INFORMATION <br /> For re-roofing over more than one layer of C. ASPHALT/FIBERGLASS COMP. <br /> existing material check with the local SHINGLES AND ROCK <br /> building official for approval, prior to Typically,a 2'to 3'(50 to 75mm)build-up <br /> beginning work. Counterbatten fasteners is required and consists of the following: <br /> must penetrate 1" (25mm) into the roof 1 X 4, & 2 X 2 (25 X 100, 50 X 50mm) <br /> sheathing or framing members. (See 111•) <br /> M...GERAR[r Page 58 0 Gerard Roofing Technologies,2001-03-01 <br />