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Installing Hardboard Siding

Roy Diez, Associate Publisher and Editorial Director
March 1, 2001
Professional Remodeler

Hardboard siding is a high-quality choice for any remodeling project. Following are recommended installation techniques for hardboard lap siding from the American Hardboard Association:

Lap siding may be applied over sheathing or, with an approved weather-resistive barrier, direct to studs spaced 16 in. on center. Wall design should provide moisture protection equivalent to a vapor-retarding system having a rating of 1 perm or less installed on the warm (living) side of the insulation. Allow a minimum 6 in. space between the siding and the ground or any area where water may collect.

Install a starter strip, approximately 11/2 in. wide and the same thickness as the siding, flush with the bottom edge of the sill plate. Extend the siding at least 3/4 in., but no more than 2 in., below the starter strip. Nail the bottom edge of the first course of sidingù16 in. o.c. maximumùthrough the starter strip and into the sill plate.

The second and all succeeding courses of siding must lap the previous course with a minimum of 1 in. Nail 3/8-in. minimum from the bottom edge and into each stud, nailing through both courses.

Install shim strips for continuous horizontal support behind the siding wherever it is notched out above or below openings. Install a drip cap or flashing above openings. Leave a 3/16-in. minimum space between the siding and windows, door frames and corner boards. Caulk these spaces with non-hardening, mildew resistant exterior grade sealant.

Also See:

Product Watch: Siding

Estimating Redwood

© 2008, Reed Business Information, a division of Reed Elsevier Inc. All Rights Reserved.

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