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.
Open cell or radiant for roof.
The installation can either include ventilation under the roof deck or have no ventilation.
You can insulate your sloped ceiling with either open cell or closed 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.
Open cell spray foam.
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.
Less common of the two types of spray foam open cell is mostly used for residential and commercial insulation.
Material costs and going with diy the open cell costs about 600 to cover 1 000 sq.
Even if it did its effects are small compared to insulation.
No paint exists that meets the technical definition of a radiant barrier.
The final two options are more or less meant to be used in conjunction with one of the above options.
Ft while closed cell comes in at 1 200.
Radiant barrier paint is a scam.
For professional installation plan to pay 2 000 or more.
Using a cool roof material on the exterior is more effective but still not sufficient.