FRAMING • Apply these lap siding products horizontally on walls and gables that meet racking requirements. • Follow product specific nailing pattern (see Fig. 4). • Framing must not exceed 16 in. on center (o.c.). • Although not recommended, where 24 in. o.c. vertical framing is used, nail to framing 24 in. o.c. with intermediate nailing 12 in. o.c. to sheathing with a 6d galvanized ring shank nail. This effectively creates a 12 in. o.c. nailing schedule. SHEATHING • Sheathing is required for all siding products. Recommended sheathing is a minimum of 7/16 in. OSB or 1/2 in. exterior grade plywood. • Foam sheathing or other composite sheathing may be substituted. Collins Products LLC will not be responsible for problems related to crushing of the foam during or after siding applications, or moisture accumulation in the wall cavity. VAPOR BARRIERS, VENTILATION AND MOISTURE CONTROL • Roofs, gutters, roof to wall transitions, windows, doors, decks and attachments shall be designed, flashed and installed to prevent moisture entry into the siding or wall cavity or accumulation of water against the siding other than ambient moisture. • Siding must have 2 in. clearance from masonry, concrete, brick, stone, stucco or mortar, or be properly flashed (see Fig. 7). • A continuous vapor barrier rated 1 perm or less is required across the interior side of all walls to be sided. • A vapor barrier rated 1 perm or less must be installed between the wood sill, wood framing and the foundation wall. • A vapor barrier ground cover must be used in crawl spaces.
• Crawl spaces, attics and living spaces must be ventilated at least to the minimum specified in HUD standards. FLASHING • In areas where the bottom drip edge of the siding is adjacent to flashing, provide a minimum 3/8 in. gap between bottom drip edge of the siding and the flashing (see Fig. 7). • Install flashing in a manner that creates proper out-sloping (see Fig. 7). • Kick out flashing is required in areas where the roof and gutters are adjacent to the siding. Provide a 1 in. clearance between the gutter end and the siding (see Fig. 8). INSTALLING • Start by ripping 2 or more inches off the top edge of the premium lap siding. The bottom portions of the ripped siding may be used for the top courses. Align starter strip with the bottom edge of the sill plate. • Make sure to prime and paint all exposed cut edges. • 16 in. Cottage Lap and Channel Rustic Sidings require 3 nails per board on all studs 16 in. o.c. • 12 in. Cottage Lap Sidings require 2 nails per board on studs 16 in. o.c. • Place nails 5/8 in. to 3/4 in. up from the drip edge and in the center of the lap. Make sure that drip edge nails penetrate both courses of siding and into studs. Do not nail in the groove (see Fig. 4). • Periodic checks are necessary to ensure the horizontal lap remains level. Make adjustments as necessary. • Vertical butt joints must be located only on studs. • When butting siding to inside or outside corners, use a minimum 1 in. thick dry wood material. TruWood Trim is recommended (see Fig. 3).
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