spray foam insulation in darien insulation eyes spray foam closed cell is best for new home/ new building or in a old building or a old home. The closed cell will stop all air flow in coming in a building. other insulation will break down in time the closed will go on working for you.To keep you worn and cool all year round. If they use spray foam in a cold storage air plain space shuttle boats why would you put spray foam insulation in a new home . why the contractors will tell the home owner foam is no good and the home owner will trust the contractor . with foam insulation in my home my heat bill is $97. a mouth for W.N.Y. and we have 2,500 SQFT home the boiler will not run all the time at night i will turn off the heat at night and will stay worm all night . foam it