Should I add rigid foam to the exterior of my house to get more R-value? I have 2x4 walls with vapor barrier. I was thinking of adding 2"-4" of rigid foam to try and get a R-value of R20-R30 including the insulation already in the walls.
I am worried about trapping moisture in the walls.
Yes, it is a good idea to insulate the outside of your house to increase your R-value. SM blue is the best Ridgid foam to use. If you're concerned about moisture the best way to beef up your R value is to sprayfoam from the inside.
Foam Board is a solution. Being that your home is framed with 2/4 the chances of the insulation in the walls being installed correctly is slim to none. Inspections on a Building Envelope didn't exist. Outside Stucco is a great look and provides a insulated exterior without creating a VapourBarrier. Just adding foam board to a exterior is not ensuring your home will be properly insulated. Attic venting are just some of the other areas to consider.
Right now it is vinyl siding.
Search the TrustedPros directory and discover the best contractors in your area.Find your home service pro