Foam Insulation Under Fiber Cement Siding

A homeowner in southwest virginia wants to install engineered wood siding over exterior foam insulation but finds that the manufacturer s installation.

Foam insulation under fiber cement siding.

The 2015 remodeling magazine cost vs. This detail is used with both new construction and also with renovation work. However it is important to remember that insulated vinyl siding does not require expensive routine maintenance such as painting and caulking which can cost up to. When using continuous insulation foam sheathing avoid over driving fasteners which can result in dimpling of the siding due to the compressible nature of the foam sheathing.

These irregularities should be corrected before the siding is installed. Value repor t listed the average price for 12 5 squares of fiber cement siding installed as 14 014 and foam backed vinyl siding at 15 184. Installing foam board insulation under vinyl siding today more than ever before homes are being built with foam board insulation installed on the outside of the sheathing and under the siding. Can this layer of rigid foam become a wrb.

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. It can but make sure the foam has been approved for use as a wrb and pay strict attention to installation details. It adds up to a robust system. Plus rigid foam insulation applied over the outside walls.

According to my calculations if i want to use rigid foam insulation on the outside of the 2 6 walls with r 21 fiberglass in the wall cavities i need at least r 11 25 in order to avoid condensation on the inside face of the sheathing. A continuous layer of exterior insulation is an excellent way of minimizing thermal bridging that bleeds heat out of a building through the framing. The foam on the outside keeps the wood frame inside the wall warm and dry. Below are some of the design details along with the benefits.

By scott gibson july 10 2017. Installation details are key. Filling the gap also eliminates space where pests can nest behind the siding and fullback is treated with a safe insecticide to protect it from termites. Under driven nails can telegraph through to the fi nished siding and trim.

I d like to side it in fiber cement siding to match the existing house. The contoured shape of fullbackfc completely fills the gap behind the siding serving as a shock absorber to help protect fiber cement siding from impact damage. Fiber cement insulated vinyl. In fact you can check if it is a correct insulation installation by pressing on the house siding.