cutting steel siding to replace windows

frank10

I want to replace the andersen windows in my home. they have been in 30 years. they are andersen narrowline double hung windows. I have steel siding that butts up to the outside of the windows. underneath the siding is fiber board. I want to cut a 2 inch channel around the windows without removing the siding to remove the storm flaps from the old windows and renail the new ones. my question is how to cut the 2 inch channel in the steel siding? what is the best tool? will the heat from the abrasive or saw blade cause enough heat to cause a problem with fire? I have had people suggest an angle grinder with a metal cutting blade. any ideas will be helpful thanks.

joecaption

Not a great plan. Anyway to just go with a replacement window so you do not have to mess with the siding?
There's just no great way to install the window and get it air and water tight by doing it the way your suggesting without removing the siding.

HomeSealed

Actually cutting back siding to install a new, flanged window is very common and is a very good way to do it, provided that you flash it correctly. The only thing I'll say, is that you may need to cut it back just a little bit more than that to do so... It is basically the same thing as installing a flanged window in brick, but just removing and reinstalling the brickmold... You wouldn't tell someone that they need to remove all of the brick surrounding the window, right?

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frank10

I want to replace the whole window, because some of the bottom sills on the outside are getting soft from weather exposure, even though they are wrapped in plastic. if 2 inches is not wide enough, then how wide does it need to be? also what would you use to cut the siding? I am not a contractor, but I do a lot of my own work.

12penny

Ive used the "Dual Saw" for this and it worked rather well.

HomeSealed

Do you have existing trim around the window, or does the siding come right up to the frame? A pic would be great.

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frank10

what is a dual saw? the siding butts directly to the window. no j channel or trim. I will send a picture later today. thanks

joecaption

https://www.dualsaw.com/

frank10

here are the pictures look and see if you have any suggestions. the siding is steel and is 30 years old made by ussteel.

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12penny

Did a whole houseful of these last year. I cut around the window
with a dual saw far enough out that the nailing flange on the new window
would fit. Installed the window, flashed properly and covered the nail flange with PVC brick-mold. Then caulk where the brick-mold meets window and siding meets brick- mold.

brockmiera

Pneumatic Nibbler

brockmiera

I just watched the video on that Dual Saw. Whoa! I need one now!

12penny

Ya..it's a pretty cool tool. Bought it specifically
for that job. Safety glasses and ear plugs
are a must...throws stuff everywhere and makes
a hellashist racket.

I'm gonna put a steel standing seam roof on my
2 outbuildings this spring. Probably use for that
as well. Supposed to be to cut just about anything.

joecaption

I would not order it from the company I posted, if you Google it you will see a whole bunch of pissed off customers.
Craftsman and Porta Cable also make them.
No way would I use one for standing seam.
Something like this would be better.
http://www.homedepot.com/Milwaukee/M...&storeId=10051

rossfingal

Good ideas -
A "nibbler" distorts the siding too much -
If you can't afford a "dual-saw" -
try a "multi-tool" -
Whatever you use -
Prime the cut edges, of the siding with some type of primer -
"Rust-O-Leum"? (SP?)
Use good caulk - "Quad", "Solar-Seal" ...
No silicone.

rossfingal

I think your siding is "Alside".