Installing Fiber Cement Siding Over Rigid Foam

Almost any type of siding can be installed over the rigid foam cedar or redwood planks exterior plywood sheets cement fiber board or vinyl siding are common options.

Installing fiber cement siding over rigid foam.

Siding installation starts at the bottom flush with the bottom of the sill plate and each successive siding strip installs above the previous one. Insert siding nails every 16 inches into the furring strips but do not insert nails between the strips. I install 1x furring strips vertically over the foam to support fiber cement lap siding. Siding over rigid foam exteriors.

If installing their fiber cement siding directly over rigid foam they do not recommend any more than 1 of rigid foam and they seem to prefer no more than 1 2 of rigid foam the main concern being that the nails will sag if driven through anything thicker than 1 of rigid foam. Acrylic fiber cement coatings deck coatings fire retardant coatings flooring adhesive removers high temperature. In a typical situation. Shawn sell of my guys remodeling explains how they installed new fiber cement with fullbackfc siding insulation for fiber cement and halfbackh20 siding insul.

We recommend performing a small siding mockup prior to installation to ensure the fastening practice and or fastening tools are properly adjusted. Most types of vinyl fiber or cement fiber siding install after the trim is in place. Extra caution is necessary if power driven fasteners are used for attaching siding over foam sheathing make sure gun pressures are adequate to prevent overdriving fasteners. The furring strips are attached to the studs with 4 screws at 6 to 8 o c.

We put 2 x 4 furring studs laid flat over the foam and attached to the wall studs with 1 5 inch foam between the furring studs rain screen over everything and finally the lp siding. Installing fiber cement siding over rigid foam sheathing i have completed several projects that use foil faced polyiso as the exterior rigid insulation board. Exterior rigid foam w modern hardie plank siding details february 13 2013 exteriors insulation air sealing siding i ve become a big fan of utilizing outsulation on all my houses over the last 2 3 years.