If a roof is treated with a layer of thermal insulation material, the internal heat gain is reduced by 60%. The U-value of the roof slab (without thermal insulation) is 3 W m2 / C. Assuming a constant temperature difference between indoor and outdoor, the U-value of the thermal insulation layer in W m2 / C is ____________

If a roof is treated with a layer of thermal insulation material, the

1.	If a roof is treated with a layer of thermal insulation material, the internal heat gain is reduced by 60%. The U-value of the roof slab (without thermal insulation) is 3 W m2 / C. Assuming a constant temperature difference between indoor and outdoor, the U-value of the thermal insulation layer in W m2 / C is ____________
A.	2
B.	5
C.	7
D.	11
Answer» B. 5

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