Cedar Trim on 3 Season Porch - finish and spacing boards

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Forum topic by Jeff B. posted 05-05-2019 02:03 PM 276 views 0 times favorited 2 replies Add to Favorites Watch
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Jeff B.

8 posts in 1519 days

05-05-2019 02:03 PM


I am about to trim out my screen porch (in Wisconsin, full temp and humidity fluctuations from 100 to -30). I milled some clear cedar to use, and the boards are generally 3/4” x 3”x lengths of 8-12 feet. Two questions….

1. Do I need to leave room for expansion at the butt joints? I know cedar is generally more stable, but do I need to leave 1/16th on the ends?

2. This is an area that will receive virtually no direct sunlight. What might you suggest if I want to maintain that nice appearance of the red cedar vs letting it go gray.

Thanks in advanced.

2 replies so far

View Delete's profile


439 posts in 1377 days

#1 posted 05-06-2019 01:53 AM

Not enough wood movement along the grain to worry about, you want to keep your miter and butt joints tight. Store your trim or raw wood in the porch for a while so it matches up with the conditions in the porch, before installing will help.

I would go with a couple of coats of varnish to seal and preserve the color of the wood.

View tomsteve's profile


1144 posts in 2224 days

#2 posted 05-06-2019 12:17 PM

end grain to end grain buts, make a beveled lap joint. end grain to edge grain but em tight.
was the wood kiln dried?
for finish, i prefer an acrylic exterior finish like general finishes 450 or sherwin williams A100 non tinted. theyre both very long lasting and i havent had problems with mildew/mold.

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