Installing Siding Over Foam Board

Use nails long enough to.

Installing siding over foam board.

Trying to install siding over existing siding along with plastic sheeting requires a level surface. 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. 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 the siding may be the easy part. 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. 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. 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.

Hardiplank lap siding can be installed over braced wood or steel studs spaced a maximum of 24 o c. Or directly to minimum 7 16 thick osb sheathing. Below are some of the design details along with the benefits. 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. Siding over rigid foam. Instantly access installation info technical bulletins sds sheets more. 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.

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. 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.