Learn all about how much blown vs rolled vs spray insulation costs. Read general insulation prices, tips and get free insulation estimates. CostOwl.com.Discover the Secrets You MUST KNOW Before Hiring Austin Insulation Companies! Will you AVOID these Austin Insulation Rip Offs? De.ed an .All the tests have been done and the results are confusing The Manual J test was run with both batt and open cell spray foam and although the spray foam did not need as much tonnage the difference was not enough to reduce the tonnage..HomeAdvisor’s Spray Foam Insulation Cost Guide lists price information on adding or replacing spray foam insulation to an attic, wall, crawl.e, etc., as reported by HomeAdvisor customers..