How can I estimate how much stain I’ll need for my exterior siding?

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How can I estimate how much stain I’ll need for my exterior siding?

The gallons needed for one-coat can be estimated as follows:

  • Multiply the house perimeter, in feet, by 10
  • Multiply this number by the number of stories
  • Multiply this number by 0.85 (to deduct doors and windows)
  • Divide this number by the stain’s stated spread rate (in sq. ft./gal.)

In formula format:

Approximate gallons of stain for one-coat
= {House Perimeter (ft.)} x {10 (ft.)} x {# Stories} x {.085} / {Spread Rate (sq. ft./gal.)}

  • The actual stain you need will vary according to your structure’s actual surface area as well as the texture and porosity of siding. For example, rough sawn wood will use more stain than smooth; bare wood will use more than previously coated; etc.