Installing Fiber Cement Siding Over Rigid Foam

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.

Installing fiber cement siding over rigid foam.

The old vertical cedar siding looks to be nailed into horizontal strapping 3 4 x 3 5 i believe. 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. In a typical situation. Siding installation starts at the bottom flush with the bottom of the sill plate and each successive siding strip installs above the previous one.

I install 1x furring strips vertically over the foam to support fiber cement lap siding. Acrylic fiber cement coatings deck coatings fire retardant coatings flooring adhesive removers high temperature. Siding over rigid foam exteriors. Most types of vinyl fiber or cement fiber siding install after the trim is in place.

The furring strips are attached to the studs with 4 screws at 6 to 8 o c. 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. This only increases the wall thickness 3 4 inch vs the furring strips william costello was planning to use and would only require increasing the interior window sill by 3 4 inch. We recommend performing a small siding mockup prior to installation to ensure the fastening practice and or fastening tools are properly adjusted.

Insert siding nails every 16 inches into the furring strips but do not insert nails between the strips. Installing fiber cement siding over rigid foam sheathing i just wasted my morning waiting for a siding contractor to not show up gee that irks me sorry no pics guys i don t think i can keep the old cedar on and do a fc reside over wood siding. 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.