About how much paint do i need for the exterior of a 1500 sq ft house?
Previous answer a good start; a gallon can will indicate average square feet it will cover. The interior square footage does not provide an accurate measurement of the exterior. Walk the perimeter. Measuring heigth and width of each wall and the eaves, minus windows and doors.However take into account the porosity and texture of the surface. For example, rough stucco can take almost twice as much than smooth surface. Rough fir sucks up a lot of paint. Be sure to apply appropriate primer. Ask your supplier and read the label.
Another thing. Buy standard colors in gallon cans from a major retailer, overbuy, return unused (keeping some for future touch up, etc).
Depends on the brand and the concentration but every can has the coverage area information on the can.
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