For higher R-value and to minimize thermal bridging, open-cell spray foam between studs is better than closed-cell spray foam.
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Spray foam installation: did I get what I paid for? (pictures included) - GreenBuildingAdvisor
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Installing Closed-Cell Spray Foam Between Studs is a Waste - GreenBuildingAdvisor
spray foam Archives - Hansen Buildings
Installing Closed-Cell Spray Foam Between Studs is a Waste - GreenBuildingAdvisor
closed cell spray foam insulation Archives - Hansen Buildings
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Spray foam insulation - GreenBuildingAdvisor
Is Spray Foam the Answer? - GreenBuildingAdvisor
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Spray foam insulation - GreenBuildingAdvisor
Spray foam insulation - GreenBuildingAdvisor