Material costs and going with diy the open cell costs about 600 to cover 1 000 sq.
Open cell or radiant for roof.
Contractors tend to stop at r20 since it s the thickest layer than can be installed safely and well in a single.
Even if it did its effects are small compared to insulation.
Radiant barrier paint is a scam.
The final two options are more or less meant to be used in conjunction with one of the above options.
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.
As an example the worst performing osb in climate zone 4 is the osb on a north facing roof insulated with open cell foam over an attic with a duct system that is fairly well sealed 4 duct leakage an attic floor which is fairly leaky 2 0 cfm50 cfa and a house with high indoor moisture production.
Ft while closed cell comes in at 1 200.
Open cell spray foam is made of open cells that are softer and flexible with the physical structure similar to a sponge shape.
Using a cool roof material on the exterior is more effective but still not sufficient.
No paint exists that meets the technical definition of a radiant barrier.
For professional installation plan to pay 2 000 or more.
The installation can either include ventilation under the roof deck or have no ventilation.
Closed cell foam while also useful in residential construction insulation is used in a variety of commercial industrial and residential applications because of the excellent strength and insulating properties described here.