Installing Siding Over Foam Board

When using foam insulation you ll need to decide whether you intend to use osb in addition to the rigid foam to serve as the building sheathing or if the rigid foam layer will itself serve as the sheathing and you ll need to determine what will serve as the drainage plane and where this layer will be.

Installing siding over foam board.

Installing rigid foam sheathing. Below are some of the design details along with the benefits. 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. Use nails long enough to.

Siding over rigid foam. Or directly to minimum 7 16 thick osb sheathing. 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. This detail is used with both new construction and also with renovation work.

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. Hardiplank lap siding can be installed over braced wood or steel studs spaced a maximum of 24 o c. Use foam board rated for exterior use that is mold and mildew resistant as well as waterproof. Instantly access installation info technical bulletins sds sheets more.

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. Place the foam board over the wall and screw in place. 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. Trying to install siding over existing siding along with plastic sheeting requires a level surface.

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. 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.