Adding Rigid Foam To Existing Exterior Walls

I will replace my roof soon and my solution to this problem had been to to apply closed-cell spray foam on the exterior side of the lath plaster when the shingles decking were removed.

Adding rigid foam to existing exterior walls. So water vapor doesnt represent an issue. When installing this retrofit wall assembly it is recommended that multiple layers of insulating sheathing be applied to the exterior of the existing wall. When done correctly with the boards secured flush against the brick wall and the seams properly sealed and taped the assembly acts as an air and water barrier.

For example rather than installing one 2-inch layer of rigid foam two 1-inch layers are installed. The opportunity that presented itself was the integration of the exterior rigid insulation board into the enclosure assembly to act not only as insulation but also as the primary sheathing and drainage plane for the wall assembly. Its ability to limit the outward migration of water vapor into a wall comes with a downside since poly also prevents the useful inward drying of damp walls.

Products in mind are. Install rigid foam sheathing directly over the brick wall with fasteners or furring strips. Make sure there are no air gaps Caulk or spray foam any air leaks and joints taking special care to cover any areas that could potentially cause thermal breaks or moisture concentrations.

This article focuses on the first layer on the walls. Construct a 24 frame wall in front of the brick wall and foam. Top left NorthernSTAR Partnerships Project Overcoat home retrofit includes adding rigid foam insulation to the walls and roof of the home.

It may look easy to go buy some packs of rigid insulation panels down at the. But recently I had the idea similar to the OP. NorthernSTAR Partnerships whole-house overcoat approach to air sealing and insulating existing homes with rigid foam installed over the roof walls and foundations has yielded air leakage.

After adding the foam insulation we fill the holes and repaint them with a custom-matched color. If there is no insulation in your walls adding spray foam is a fairly easy process requiring you to basically drill a few easily patched holes in your walls. Eric Nash has a kitchen renovation in the works at a house with 24 exterior walls.