Guest User
We have a small guesthouse which is a pre-fab metal building erected by the previous owner. The roof is made of overlapping sheets of metal, brown in color. On a sunny day the temperature inside the house (with no AC) is always higher than the outside temperature. When the AC is running on a sunny day, it cannot keep the building cooled to 78 degrees (we had the AC installed; it is an appropriately-sized decent-quality system.) We plan to upgrade the insulation under the roof panels and my research suggest that painting the roof white, or applying a reflective coating, would also help. Can anyone give us advice and guidance?
Todd Miller
Isaiah Industries, Inc.
White will be as reflective as you can get. Additionally, anything you can do it increase insulation and ventilation will be helpful. Ventilation, if you have none now, will be more helpful than more insulation. Remember that proper ventilation requires intake vents and exhaust vents.
Eric Novotny
An informed customer is the Best Customer!
+1 A coating with a higher emissivity and reflectivity will keep more of the radiant heat out of the roof structure and materials. It is certainly worth a shot and please be sure that the ventilation is correct and adequate as Todd mentioned.

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