Installing Siding Over Foam Board

Installing the siding may be the easy part.

Installing siding over foam board.

Wrap the house with a moisture barrier usually some type of polystyrene wrap and install desired siding by nailing through the foam board into the house framing. We show z flashing below the first course of siding and we show perforated board wrapped with insect screening to allow air entry at the base of the wall. In locations with high exposure to wind driven rain it may be necessary to install tar paper or housewrap behind foam sheathing to help control any rainwater that penetrates the siding. Place the foam board over the wall and screw in place.

Measure and cut the foam board to match the exterior wall that needs to be covered. Siding over rigid foam. This detail is used with both new construction and also with renovation work. Use foam board rated for exterior use that is mold and mildew resistant as well as waterproof.

Installing rigid foam sheathing. 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. Instantly access installation info technical bulletins sds sheets more. Below are some of the design details along with the benefits.

Hardiplank lap siding can also be installed over foam insulation up to 1 thick irregularities in framing sheathing and or foam insulation can mirror through the finished application. To sum up if you want to install tar paper or a housewrap with foam sheathing install it under the foam sheathing but keep the air space between the siding and foam. Or directly to minimum 7 16 thick osb sheathing. Hardiplank lap siding can be installed over braced wood or steel studs spaced a maximum of 24 o c.

Use nails long enough to. Strapping screwed or nailed to the framing through the foam will keep everything in place and provide a rain screen to help the siding stay dry.