Installing Siding Over Foam Board

But the use of exterior foam on the outside of the building raises other concerns namely how to prevent the accumulation of water in the wall that would encourage mold and rot.

Installing siding over foam board.

Use foam board rated for exterior use that is mold and mildew resistant as well as waterproof. Installing rigid foam sheathing. 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. 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.

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

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. Measure and cut the foam board to match the exterior wall that needs to be covered. This detail is used with both new construction and also with renovation work. 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.

Installing the siding may be the easy part. Or directly to minimum 7 16 thick osb sheathing. Use nails long enough to. Instantly access installation info technical bulletins sds sheets more.

Siding over rigid foam. Hardiplank lap siding can be installed over braced wood or steel studs spaced a maximum of 24 o c.