I can't find the original reference where H. Cloake advocates a 10mm gap for the bottom boards. However, going back into the archives I found this
> The double sided bottom board makers claim the two spaces as an advantage although it is a by product of the production method. They say to use the 3/4 inch space in the summer for better ventilation and the 3/8 inch space in winter. Is there any scientific evidence showing that the 3/4 inch space is needed? The 3/8 inch blocks mice and is a fairly large area ( 15 X 3/8 ~= 5 square inches). —Ray Lackey 18 Jan 1995
Like I said, I simply use the 3/8 inch side year round. I agree, it is adequate for air flow and blocks mice. Even if it's only a deterrent, it's working.
PLB
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