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Old 11-22-2009, 12:43 AM   #1
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Pressure treated wood?

Going to reframe a bathroom window that was rotted due to water damage.
The window sits inside the shower stall.

Can I use pressure treated wood for this window frame?

Also, what is the best type of window and moulding to prevent this water damage to the frame and sill in the future?
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Old 11-22-2009, 06:10 AM   #2
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yes you can. But this is not needed. What you need to to waterproof the sill and be sure it drains properly (slopes into the shower) You need to cover below the sill with EDPM membrane at least. I would use Azek trim since it is impervious to the water.
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Old 11-22-2009, 06:45 AM   #3
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Most home stores and lumberyard carry composite or solid vinyl trim and stock. It is impervious to water, and works like wood, but a bit more expensive. PT wood expands/comtract too much making it unsuitable for things like trim.
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Old 04-12-2010, 12:45 PM   #4
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Try using a polyurethane on new pressure treated wood.
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Old 04-12-2010, 09:40 PM   #5
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Like Bob said...cover the bottom rough framing with a waterproof membrane that turns up the trimmer studs a few inches. Place a shim across the back, to pitch the sill about 1/4", so that any moisture will drain back into the shower, and use something like Azeck or cultured marble for the sill.
Even if you use a KDAT#1 wood, it will move too much, not hold paint well, and develop cracks that will let moisture in and hasten the failure of the paint job.
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Old 04-13-2010, 07:50 AM   #6
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We had the same problem.

You can also use foundation sealer (black tar) to seal up areas from moisture. We did that on our bathroom framing, even on the pressure treated.

You dont want to lock in internal moiture which can also damage the wood, however applying it to the sides is a great idea.

Also, sheets of brass or copper can be glued (also with tar ironically) to window frame bases so water rolls out....with the weeping holes.

And if you stop and think about the bottom of the window frame....does it really need to be painted white? Will people be seeing this all that often?

For the money and effort I love the foundation sealer. Nothing protects like that stuff...water doesnt stand a chance. Even a thin layer is great. And Im willing to bet that latex paint (which Im not a fan of for sealing water out) would stick to the foundation sealer when its fully dry)
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