Fiber Cement Siding Over Concrete Block Insulation

I m planning an extensive renovation of a 1950s cinder block home in central florida.

Fiber cement siding over concrete block insulation.

Siding fastener length cmu wall spaced 16 or 24 o c. Hardieplank lap siding 6 clearance to grade trim refer to ner 405. I ll be taking off the roof and taking down all the interior walls leaving a bare uninsulated concrete block wall with no finishes either on the inside or outside. Wood fiber cement or plywood siding should not be installed directly over the foam writes senior editor martin holladay.

Screw the strapping through the foam to the studs. I wouldn t hesitate to install 1 3 or 2 4 horizontal strapping 24 inches on center on top of the foam holladay recommends. Fiber cement siding stands up to wind rain hail fire insects and even hurricane level storms. Siding over rigid foam exteriors.

Method 1 james hardie siding installed directly over continuous insulation c i and other non nailable substrates e g. Minimum nail length must accommodate sheathing and penetrate framing a minimum 1 inches. Current pneumatic nailers have maximum fastener lengths. Insulated vinyl siding is made of rigid contoured insulation permanently adhered to vinyl siding while fiber cement siding is made from a mixture of sand cement and cellulose fibers.

Fiber cement siding comes in many colors and textures including some that mimic wood shingles. I ve looked at a lot of the material on building science and would like to. Cladding attachment over thick exterior rigid insulation background current building code does provide prescriptive means to attach cladding over exterior insulation table r704 3 note v. Though generally used over wooden house sheathing you can mount your hardiplank siding over brick with only few preparatory steps.

Method 1 over furring. And other non nailable substrates e g. Starter strip hardieplank lap siding nailed directly to block walls trim cmu wall 6 clearance to grade refer to table on next page for fastener type and fastener spacing. One new wrinkle for many builders is walls built with fiber insulation between the studs plus rigid foam.

Cement concrete block concrete forms. Hardiplank is a fiber cement siding made for exterior use to cover a structure in a long lasting sheathing. A third party life cycle assessment found that insulated vinyl siding has a lower overall environmental impact than fiber cement second only to traditional vinyl siding and cedar.