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Posted by Dodgeman on December 21st, 2000 01:36 PM
In reply to Question For Dodgeman ... by Jay J -Moderator on December 20th, 2000 01:45 PM [Go to top of thread]

Sorry Jay J, my post above wasn't focused only on your question, so I missed part of yours. I guess I'm having second thoughts on laying that ceramic tile over painted particle board?
Anyway, the more boundary layers (panes) the better. So two air gaps (three panes) are better than one large gap (two panes). The reason has to do with convection currents that occur when the gap gets too large. I'm not sure what the upper limit is on the most effective gap is, but I think it is in the range og 5/8 to 3/4 inch. Also, as indicated in my above answer, the cooler the air gap, the better, but the effect is so slight, you can ignore it. Your North facing "air gaps" should be fine.
Have a great Holidays! I'll probably be off line until after the New Years.

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