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Old 06-27-2013, 09:48 PM   #1
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Hi,

When installing a new construction window is it necessary to create a slope in the sill by using a piece of beveled materials such as cedar siding? If so, does that piece get fastened over or under the sill flashing tape?
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Old 06-28-2013, 07:46 AM   #2
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Most windows have the slope built into the sills these days, so no.
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Old 06-28-2013, 10:27 AM   #3
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Window question


Mark, I had this same dilemma with my windows. The sills were all flat. So I bought a product that gives the sill a sort of sloped sill. It's called tegratite, foam wedge put underneath the window, stapled to the sill stud framing. I used jeld-wen windows so i believe this is their product. Got it from a local supply house.

if you're going to put cedar siding on your sills to give a sloped sill, think about protecting it. otherwise check out sill pans or what i used.
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Old 06-28-2013, 02:20 PM   #4
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The sills on the Jeld-Wen single hungs you just put in were flat?

There is a difference between a sill plate and a window sill.

If the water in inside and sitting on the sill plate, you have much bigger issues and will eventually get rot and moisture issues.
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Old 06-28-2013, 05:48 PM   #5
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Window question


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Originally Posted by Windows on Wash View Post
The sills on the Jeld-Wen single hungs you just put in were flat?

There is a difference between a sill plate and a window sill.

If the water in inside and sitting on the sill plate, you have much bigger issues and will eventually get rot and moisture issues.
That is correct. No slope sill on the single hung. Didnt have sloped sill on previous window either. No rot after 43 years either.

I agree if you have moisture coming back in you will have long term issues. I tyvek'd visible studs where the window would be touching. Then put tegratite down,popped in window and flashed fins. Many rainstorms to date and no water leaks. I still have the stools off.

Mind you i did remove my siding as it was being replaced so it made window install much easier.
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Old 06-28-2013, 10:47 PM   #6
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Wow, I can't believe what the rationale would be to put out a single hung with a flat sill but your install approach seems very solid so I am sure that is your saving grace.
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Old 07-01-2013, 07:35 AM   #7
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Most windows have the slope built into the sills these days, so no.
I'm talking about the rough opening sill not the actual window.
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Old 07-01-2013, 07:57 AM   #8
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Most guys don't slope the sill plate any longer. The flashings have gotten so good (flexible and what I prefer in the pan flashings) that it doesn't matter like it used to.
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