Exterior sill on new construction casements


Old 06-05-12, 05:44 AM
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Exterior sill on new construction casements

So I ordered two "new construction" casement windows from Home depot. It is a wood Jeld-wen casement window. They came in and I went to go install them this weekend with a friend who has a bunch of experience doing home remodeling.

These window are going in the kitchen and im doing a complete gut of the interior wich is why I didnt mind doing the new construction. The window that I received looks to me like a "replacment" window. Its really just a box. No exterior sill and no nailing fin or flange. Apparently because its a wood window it does not come with a nailing fin. I think there are instructions on how to make one if wanted to. I havent looked into this yet. However there is no exterior sill. Should there be? The one on display that is meant to be the same model was what I ordered has aluminum clad and brick-moulding. It has what looks like an exterior sill but I guess they call that a sill nose? Does this seem correct? Can I just install these without creating an exterior sill?

what makes this different from a replacement? I dont see it... Pictures below.

Thanks for the help!
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Old 06-05-12, 06:00 AM
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Casement windows (that I have ever seen) don't have a sill. They are set almost flush with the exterior and trimmed out however you want it. They still need to be flashed correctly of course.

A plain casement window w/o a nailing flange does indeed "look" like a replacement...but replacements are sized (or custom sized) to fit into an existing window frame w/o disturbing the siding or trim. New construction would have a limited number of standard sizes available.
Old 06-05-12, 08:22 AM
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hmm ok. That makes a little more sense.

I know there may not be a straight forward answer to my next question. But how do I flash it correctly? Most of the how to's i read talk about house wrap and what not. my house is a 1910 cape in New England. I am fairly certain there is no house warp on the house. I also didn't really plan on messing with the siding at all. I have fairly simple but thick trim around all of the windows. This should give me enough room to do what I need then install new trim. or the old stuff if its in good enough condition.

any tips or reference links?

Thank again!
Old 06-05-12, 01:12 PM
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I'm just the piano player, so don't shoot. You won't achieve a good seal without proper flashing, and proper flashing can't be achieved without removing and replacing some of the siding. Got pictures of the outside? http://www.doityourself.com/forum/el...your-post.html
Old 06-05-12, 03:45 PM
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It's hard to believe that they didn't send you any nailing fin. What do they think "new construction" means??? I would definitely be talking to HD about no nail fin, and no cladding. If you were wanting to order something exactly like what was on display, they obviously didn't get that message. A sill nose is an option with some windows, with others, the bottom of the window looks the same as the sides (no nosing). New construction windows generally stick out roughly 1 1/8" past the sheathing once the nailing fin is installed. This will allow you to nail a sill nose under the window after it is installed, if that's the look you are going for. Just be sure to run a healthy heel bead of sealant against the window before you push the sill nose up into it.

At any rate, you definitely want nailing fin... you SHOULD get aluminum cladding if you want the window to last more than a few years... and once you get the nailing fin you should be able to either cut the existing siding back... or make a sill nose and trim to fit the existing siding opening. If there is no existing opening, and these windows are being cut into a new location, I would suggest you cut the siding back just far enough to get the window temporarily installed... and once it's set in place, mark a new line around the perimeter of the window that will represent the outer edge of your trim. That should give you enough room to use some adhesive window and door flashing tape, which will seal the nailing fin to the sheathing. Plan to install a drip cap under the siding on top, which will provide a drip edge over your top piece of trim.

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