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Old 01-30-2012, 01:41 PM   #1
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rough openings, flashing and enlarging


We need to install 2 full frame windows in a room that we are redoing. The frames are bare wood, not flashed, and get wet every winter day with condensation on the aluminum windows. They aren't rotten, not yet. The exterior is aluminum siding circa mid 1980's - not sure what house wrap product might be under there.

Main question: How much will the needed window flashing add to the window's rough opening measurements? The Andersen installation guide doesn't say to add a beveled piece to the bottom sill to help drain water away, but should we?

Second question: How much smaller can the new window's rough opening be for a straightforward installation, before you have to do extra exterior work. We are having trouble finding a stock window that is just a bit smaller.

Is it crazy talk to think of enlarging the rough opening? We need to add about 1/2 in. for height and 1 1/2 in. for width to fit some of the stock Andersen sizes.

Thanks for your help!
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Old 01-30-2012, 03:54 PM   #2
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rough openings, flashing and enlarging


Just order a custom sized window. All vinyl and most wood manufacturers will have a size that will be exact or very close to your opening size, so I would not enlarge or shrink the opening.
On the flashing, that will not take up any space in the RO, although, adding a beveled piece on the sill and then creating a sill pan with flashing tape is indeed a good idea. That is all that you really need to account for in your measurements. I assume that this will be installed with a nailing fin?

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Old 01-30-2012, 06:21 PM   #3
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rough openings, flashing and enlarging


Thanks for the info. Good to know the flashing is negligible thickness. Custom windows, at least in wood, aren't in the budget.

Do you think a new window (with nailing fin) with a RO size of 3'-10 1/8" x 3' -8 7/8" is close enough to the actual RO of 3'-11 1/4" x 4'-0 1/4"? Is the 3 1/4" height difference too different?
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Old 01-30-2012, 06:46 PM   #4
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rough openings, flashing and enlarging


I order vinyl windows every week and there is no upcharge for a "custom" window.
The biggest pain on installing or changing the size of your windows is the fact you have aluminum siding.
If it was vinyl it would be a snap.
If it was me I would order a vinyl window with flat jambs. The reason being you would not have to deal with any of the outside trim.
With a nailing fin (which would be the best way to install a new constrution window) to get the window in you would have to remove the siding and J molding to get it in. Not going to happen with aluminum siding without damage to the siding.
How about a picture of the outside?
I'd pass on the Anderson windows for a bunch of reasons, but that's a differant subject.
Look into Windcor or Simonton instead.

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Old 01-30-2012, 07:19 PM   #5
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rough openings, flashing and enlarging


Alhahn, are you trying to buy windows off the shelf at HD?... Just go to a supply house and you can order the size that you need. Even "standard" sizes will still be no more than around 1" increments. You will spend more on materials alone ( let alone labor) compared to just ordering a properly sized window.

Joe, in that situation we just cut back the aluminum and move the trim out/add new trim. Pulling off aluminum panels would be ridiculously difficult and unnecessary.
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Old 01-30-2012, 09:53 PM   #6
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rough openings, flashing and enlarging


Custom vinyl does not usually involve any sort of up-charge.

You can cut back the aluminum as HomeSealed mentioned and get a j-channel of sorts behind hit and go new construction.

+1 on Joe's product recommendations (WinCore or Simonton are both good)

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