Open cell spray foam is made of open cells that are softer and flexible with the physical structure similar to a sponge shape.
Open cell or radiant for roof.
The final two options are more or less meant to be used in conjunction with one of the above options.
You can insulate your sloped ceiling with either open cell or closed cell spray foam.
Radiant barrier paint is a scam.
Open cell spray foam.
Contractors tend to stop at r20 since it s the thickest layer than can be installed safely and well in a single.
Material costs and going with diy the open cell costs about 600 to cover 1 000 sq.
Applications that typically use open cell spray foam include residential construction insulation under roof trusses for conditioned attics and as a spray foam sound insulation in media rooms etc.
Less common of the two types of spray foam open cell is mostly used for residential and commercial insulation.
Even if it did its effects are small compared to insulation.
Using a cool roof material on the exterior is more effective but still not sufficient.
Ft while closed cell comes in at 1 200.
No paint exists that meets the technical definition of a radiant barrier.
R20 open cell foam is fine under roof decks but would not meet the r30 code minimums unless you also had r10 of rigid foam above the roof deck.
The installation can either include ventilation under the roof deck or have no ventilation.