PS: Will post pics of completed treehouse soon. (Its over 300 sq ft and has 2 ziplines :thumbup: )

Thanks,

Bill

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PS: Will post pics of completed treehouse soon. (Its over 300 sq ft and has 2 ziplines :thumbup: )

Thanks,

Bill

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Divide the stainable wall area by 350 (the square-foot coverage in each gallon can) to find the number of gallons of stain you need for the walls. You can round uneven numbers; if the remainder is less than .5, order a couple quarts of stain to go with the gallons; if the remainder is more than .5, order an extra gallon. Of course, buying in bulk is usually more economical, so you may discover that 3 quarts of stain cost as much as a gallon.

The following examples walk you through the calculations for determining how much stain you need for a 14-x-20-foot room that's 8 feet tall and has two doors and two windows.

Use the following formula to estimate the amount of stain for your ceiling you will need after all it is a tree house. Double the result if the ceiling requires two coats.

14 × 20 = 280 square feet

280 ÷ 350 = .8

For this example, you want to buy 1 gallon of stain for your ceiling for a single coat.

Now use the following formula to estimate the amount of wall stain you will need. Double the result if the walls require two coats.

14 + 20 + 14 + 20 = 68 feet

68 × 8 = 544 square feet

544 – 70 = 474 square feet

474 ÷ 350 = 1.4

For this example, you want to buy 1 gallon and 2 quarts of stain for a single coat.

If you have trim measure the length of the trim in feet, and multiply that number by 1/2 foot (.5), as a rough size for the width of the trim. Include all the trim around doors and windows, at baseboards, along the ceiling. As an example, imagine that you have ceiling molding running around a room that is 14 feet wide and 20 feet long.

Round the numbers off to the nearest foot.

14 + 20 + 14 + 20 = 68 feet

68 × .5 = 34 square feet

34 ÷ 350 = .09

The result in this example is much less than a quart, but you may paint other woodwork in the same area, so buying a full quart may not be terribly wasteful.

Use the same figure for estimating door coverage as you use in your wall-area calculations — 20 square feet = one door. Multiply the number of doors by 20, doubling the answer if you plan to paint both sides. Wall stain estimates allow for 15 square feet for each window. Use about half that window area to figure trim and inside sash — the glass isn't important to the calculation.

For the room in this example:

2 × 20 = 40 square feet

2 Windows × 7.5 = 15 square feet

40 + 15 = 55

54 ÷ 350 = .16

Often, you end up needing to buy only a quart of paint, which goes a long way on doors and window trim.

Hope this gives you a headache lol and fine tunes your answer on how much stain to buy for your tree house project.

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Thanks everyone! Love that formula hahaha

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I stain a lot of my treehouses - it's much better than painting them. I find that the type of siding and the application method are the most important factors in the coverage.Thanks everyone! Love that formula hahaha

Here's two of my "guidelines"

1. Brushing/Rolling uses more than spraying.

2. Rough textured wood uses more than smooth wood.

The answer is that you're going to need 1-2 gallons, depending on the above, since most cans are 350-400 square feet of coverage.

Here's two examples:

Treehouse #1 covered almost 600 square feet brushed and rolled and took a little over 2 gallons - had to crack the third can. Medium textured siding.

Treehouse #2 covered about 350 square feet with a cheap sprayer and used about 2/3 of a gallon. Smooth siding.

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