One of the services we offer is known as "Poly Web" or "Bib and Blow". This is a type of wall insulation that allows us to maximize the R value in the walls. We install a poly webbing material, which does contain a vapor barrier, to the studs of the walls, and we blow insulation into the cavity between the poly web and the exterior wall. This is a great alternative to the basic 'batt' or 'rolled' insulation.