New Windows New Siding Do I Add Foam Board

Originally posted by maxminimus.

New windows new siding do i add foam board.

What are my options for weatherproofing this juncture of the siding to the windows when the 1 foam board projects the siding outward 1 from the sheathing. I have been planning a energy retrofit of my home in austin texas and here is how i plan on installing my new windows. The window sills are flashed using a 1 4 dam along the interior edge of the sill and the side and top nailing fins are flashed to the sheathing. But if you use wood clapboard siding foam.

I am adding 1 1 2 inches of foam with a radiant barrier over my existing t 11 siding. They said that to increase the r value of your home you should put 2 inch foam board insulation on the walls over the sheathing then wrap and then side them. Using exterior rigid foam board insulation is a great way to make a building more energy efficient quieter and more likely to prevent moisture infiltration problems. By adding a continuous layer of insulation under new siding you are able to wrap the home in a complete blanket of energy savings.

After flashing the window area i am installing 1 x 4 furring strips on top of the foam. New construction windows will be attached with the flanges to the 1 x 6 pt. Some builders think that homes with picture frame window construction where windows are framed with strapping lumber before windows are installed should have the rigid foam go on first with the house wrap over that. The method works for both new construction and remodeling and doesn t affect siding and trim details very much.

If i add the 1 foam board the vinyl siding will no longer of course fit into the built in j channel. Typically installers add a moisture barrier beneath the window frame which extends below the siding as well. Bottom line is exterior foam insulation is a good investment. The windows are vinyl with a built in j channel.

Specialized equipment is not required for the installation of foam board. How housewrap affects ventilation. Both ways effectively prevent air leaks and infiltration. 1 x 6 pt is installed around my window openings and will be flush with the furring strips.

In addition flat foam insulations can help level out inconsistencies in the wall for a more perfect siding appearance. If you have your contractor install the siding prior to replacing the windows they may have to cut into your lovely new siding to put that barrier in place.