You can put some numbers on what you need using Manual J8. The demo version
of the software for this by Wrightsoft will give you some idea of what is
An example from my house bedroom is that with R28 insulation on the ceiling
and a radiant barrier under the tiles the cooling requirements are 163 cfm.
With no radiant barrier this rises to 170 cfm. With no insulation at all
the figure is 338 cfm! i.e. the most important thing is the glass wool and
not the radiant barrier.
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