Posts: 20,381
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Location: CinDay
A large proportion of exterior windows that are "painted" (non clad) are simply white wood, Pine, Fir Spruce, SYP, etc. With these unless it is PT it requires a good seal coat of primer, followed with 2 to 3 exterior coats, and then regular maintenance. Down South they have better access to Cypress, and it weathers very well, North is more Western Red Cedar, WO, maybe black locust.
Back to the whitewood, if well covered it will do well, and a lot of windows are made of it throughout America. Modern day new it's heavily clad with metal, or vinyl. Lot's of answers, and for most location will likely have something to do with the choice.
Worst thing they can do is cook ya and eat ya
GW
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As far as wood species for your windows,depends on availability.
Cedar,cyprus and redwood are three that are weather resistant but not dense. Black locust is very weather resistant but not generally carried.I have used white pine ,Luan and recently Ipe.All of the last three are good choices.I am in South Jersey and buy at a hardwood yard that also makes components for the boating industry.
When I questioned the owner about using Luan,Steve said we make boats from it,should be good enough for windows.
My shop windows are made from Luan,still look good after 20+ years.
There are some woods to stay away from.Red Oak, and Poplar are two I know of. I made outside corner boards for one job and used poplar.Well painted etc.Had to replace them after 6 years at my cost.
I made a heavy mallet from Red Oak for a friend used to split logs with a froe.
He left the mallet out in the weather all the time and it began to rot after a year or so.
White Oak would have lasted a long time.
mike
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Spanish Cedar holds up pretty well for sash, and other exterior uses. I bought retail Spanish Cedar for $7.00/ bf retail in Connecticut this week. For sash, that's about $14.00 in wood per window for wood that lasts a long time.