Radiant barriers under a tin roof

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Permalink Reply by James Olson on September 15, 2011 at 12:05pm

In heating climates (where one's furnace is on more days/yr. than the A/C is) a radiant barrier foil can be attached to the underside of the roof rafter or on top of an unfinished attic floor insulation (the latter can cause increased moisture problems).

 

However, in South Carolina, I suspect the use of A/C and the humidity may cause condensation problems which can be somewhat mitigated if a perforated foil is used and attached to the sheating.

 

Note: All radiant barriers must meet ASTM E 84 & ASTM E 2599 fire resistance requirements.

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Permalink Reply by Franz on January 11, 2012 at 5:21pm

BAD idea!

Reflecting the heat back to the roof is nearly as bad as allowing heat to accumulate in insulation and reradiate into the living area.

You have a metal roof, why let heat past it when you can keep it out nearly completely by sprinkling the roof?

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