10/29/2026
Open cell or closed cell: which spray foam goes on a metal building?
Short answer: closed cell anywhere foam touches steel. It blocks moisture, stops condensation and has about twice the R-value per inch. Open cell has its place too, in wood-framed walls and between rooms for sound control.
Our new blog post covers the full comparison, plus how we insulate steel-framed and hybrid barndos:
https://www.dhwcbuildings.com/blog/spray-foam-insulation-benefits-and-open-vs-closed-cell
Building soon? Drop your questions below 👇
Spray foam is the insulation we recommend most for metal buildings and barndominiums in the Texas Hill Country. It seals air leaks, stops condensation on steel, and keeps cooling bills down through our long, hot summers. But not all spray foam is the same. Below we cover what it does well and how to