Installing Fiber Cement Siding Over Rigid Foam

In a typical situation.

Installing fiber cement siding over rigid foam. I install 1x furring strips vertically over the foam to support fiber cement lap siding. 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. 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 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.

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. We recommend performing a small siding mockup prior to installation to ensure the fastening practice and or fastening tools are properly adjusted. The old vertical cedar siding looks to be nailed into horizontal strapping 3 4 x 3 5 i believe. Shawn sell of my guys remodeling explains how they installed new fiber cement with fullbackfc siding insulation for fiber cement and halfbackh20 siding insul.

Siding installation starts at the bottom flush with the bottom of the sill plate and each successive siding strip installs above the previous one. 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. The furring strips are attached to the studs with 4 screws at 6 to 8 o c. Siding over rigid foam exteriors.

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. 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.