Advantages of closed-cell over open-cell Spray foam
Closed-cell foams are superior insulators than open cell spray insulators. Open-cell spray foams insulator typically have R-values of 3 to 4 per inch on other hand closed-cell spray foams can attain R-values of 5 to 8 per inch.
Open-cell spray foam is porous in nature and allow water vapor to penetrate the insulation where as Closed-cell foam is non-porous in structure and does not allow moisture to penetrate, form a effectively vapor barrier.
Closed-cell foam is very strong and increase structural strength of building by reinforcing the surface where as open-cell foam is soft with little structural strength.
Open-cell spray foam requires trimming after installation, and disposal of the waste material on other hand closed-cell foam rarely requires any trimming and with produces little or no waste.