Using a cool roof material on the exterior is more effective but still not sufficient.
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.
Even if it did its effects are small compared to insulation.
Less common of the two types of spray foam open cell is mostly used for residential and commercial insulation.
Ft while closed cell comes in at 1 200.
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.
For professional installation plan to pay 2 000 or more.
Contractors tend to stop at r20 since it s the thickest layer than can be installed safely and well in a single.
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.
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.
Open cell spray foam.
Open cell spray foam is made of open cells that are softer and flexible with the physical structure similar to a sponge shape.
Material costs and going with diy the open cell costs about 600 to cover 1 000 sq.
The installation can either include ventilation under the roof deck or have no ventilation.
Radiant barrier paint is a scam.