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Old 01-23-2013, 11:30 AM   #1
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Best way to cut hole for exterior shower???

I plan to install an outside shower on my Puma that has aluminum siding. Any thoughts on the best way to cut the siding? Jig saw with fine blade is one option- but if you aren't extremely careful and lucky, you can warp the thin metal from the blade hanging. Considered using a grinder with a thin cutting blade and will probably go that route unless another better option is suggested. Only concern there is maintaining control of the grinder for a nice clean cut. If anyone has a better idea, I'm all ears.
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Old 01-23-2013, 11:38 AM   #2
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Hole saw?
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Old 01-23-2013, 11:52 AM   #3
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assume you will need a square hole for the shower, I think your idea of an angle grinder is probably best. least likely to warp the tin, though it may heat warp anyway.

Either way I would tape it with some heavy tape and then draw your lines. The tape should prevent the tin from tearing as easily, though it will smoke a little with an angle grinder.

Had to cut quite a bit tin commercial building siding, and used an angle grinder for it. nice thing was we could smooth any edges with the grinder too.
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Old 01-23-2013, 12:02 PM   #4
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Router with a guide and jig.
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Old 01-23-2013, 12:15 PM   #5
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How about a small cut-off wheel? Drill 4 holes, one on each corner then use the saw with a smallish 3" circular blade to punch thru and cut lines corner to corner. It should be real easy if you're patient.
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Old 01-23-2013, 12:50 PM   #6
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Quote:
Originally Posted by rattleNsmoke View Post
How about a small cut-off wheel? Drill 4 holes, one on each corner then use the saw with a smallish 3" circular blade to punch thru and cut lines corner to corner. It should be real easy if you're patient.
Are you going to cut a round hole or a square opening?

Use a circle saw for the round hole and back up the siding with something solid if possible to prevent buckling.

The other replies will work for a square opening.
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Old 01-23-2013, 01:32 PM   #7
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I did a simular cut through our home siding...I used a circular (skill) saw and it worked pretty good. It was pretty easy to control, but, better triple check the depth adjustment though.

The good news is that the flange of the shower housing will cover any imperfections from the cut.
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Old 01-23-2013, 01:52 PM   #8
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Find an aluminum sheet nibbler, works great on aluminum and easy to use. Hand tool price under $20 online.
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Old 01-23-2013, 01:53 PM   #9
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oscillating saw works the best......grinder may cause a fire in the wall.....
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Old 01-23-2013, 03:29 PM   #10
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Thanks for the advice. I am somewhat concerned(after some thought) about heat buildup when using the grinder method as someone mentioned. Didn't even know there was such an animal as the nibbler tool. I've used a nibbler that was powered but it's too large to use on something like this. Definitely will have to check into that.
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