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Question DetailsAsked on 6/12/2015

Can a slate roof cause the top floor to be hotter than normal? My air conditioner is not keeping up.

I recently finished the attic in my old 1927 home in Norfolk, VA. The roof is made of dark slate. I installed 3 tons of air conditioning cooling for the 2nd and 3rd floors. The 3rd floor still gets above 90 degrees on hot sunny days here in Norfolk, VA. The 1st and 2nd floors are 27 ft x 27 ft. the 3rd floor is 27 ft x 12 ft.

I put insulation between the roof and the sheet rock ceiling of 3rd floor. I do not have soffit vents. HVAC contractor recommended a 1 ton vent less unit to resolve the problem. I do not believe his calculation included the heat from the roof as I don't think a 1 ton unit would help that much.

Does the black slate roof cause the 3rd floor to heat up that much? If I were to install more cooling, how would I figure out how much cooling to install?

Thought about having solar panels installed on the roof to shade the roof. Thus, instead of spending more money on electricity on more cooling, use the solar to pay for the existing cooling. Ever seen that?

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