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Old 07-09-2012, 08:11 AM   #1
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Proper way to Cap Windows with Siding already in place


Hello,

I recently purchased a house that has aluminum siding, and I'd like to wrap the windows and doors. This is an investment property so it's not something I have to look at everyday, but I'd still like it to look nice and I'm pretty handy, so I will be doing this myself. (At least that's the plan...)

Most of the DIY videos I've watched online show the wrapping going up before the siding. In my situation, the siding is already up and I'm going to need to wrap over it. There are approx. 25 windows in this building and 5 doors, so it's going to be a lot of work, and removing the siding is not an option.

Attached is a cross-sectional view from the top showing what I'm working with. Capping the window sill and the top of the window looks pretty straight forward, but the sides are where I'm confused.

How should my capping and j-channel be attached to each other and where should the capping end? The two options I see are that either I cap completely around and over the j-channel, or I cut my cap flush with the front edge of the j-channel. If both of these are wrong, please let me know what you'd recommend.

Thanks in advance for your help.

-Justin
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Old 07-09-2012, 08:30 AM   #2
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Proper way to Cap Windows with Siding already in place


You would be far better off to hire this one out.
Reasons being is to do this one simple looking job your going to need a brake to bend the metal. A brake is about a $1800.00 tool. Then you would need seamers, snips, pea shooter.
Just one roll of coil stock is almost $100.00 so the learning curve even if you rent a brake trying to figure out how to do the job can get real expencive fast.

If the material is installed wrong it can cause more trouble then you have now. Water can get trapped behind the coil and rot out the wood.

Two guys one bending and another installing should be able to do the job in about a day.

PS both your options you showed in the drawings are incorrect.


Last edited by joecaption; 07-09-2012 at 08:33 AM.
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Old 07-09-2012, 08:37 AM   #3
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Proper way to Cap Windows with Siding already in place


Thanks for the quick response Joe.

My Dad has access to a very high quality brake, through a friend of his who is a contractor, so that is an option. I also stumbled across this website, trimbender.com that will bend trim to any shape/size you give you them. I was going to try this website out for one window, and if it goes well do the rest of them in this same manner.

I realize that this material needs to be installed correctly because I've read many horror stories online about it not being installed right. That being said, I'd still really prefer to do this myself...the right way. I just installed a new bathroom and did all of the plumbing and electrical myself (to code). I know this is completely different, I'm just throwing it out there that I love the challenge.
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Old 07-09-2012, 08:53 AM   #4
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Proper way to Cap Windows with Siding already in place


Someone bending the material off site is just a bad idea.
Your not even sure at this point on how to install it, how would you give them the measurements?
Damage in shipment is a very real possibility. It hard to not mess it up just working on site.
Why not see if you can get someone who knows how to do it to do at least one for you so you can see how it's done?

I will give you one tip, the order to do it is, sill first, the sides next, then the top piece.
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Old 07-09-2012, 09:08 AM   #5
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Proper way to Cap Windows with Siding already in place


a third and easiest option would be to slide the aluminum under the j


while you can cap the j at the sides[first pic]i wouldn't recommend that for the top,the chance of water being led straight into the window is too great
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Old 07-09-2012, 09:21 AM   #6
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Proper way to Cap Windows with Siding already in place


I've seen this profile done more times than not. It's alot easier to make these bends than the multiple bends you show. The bend back essentially clips on the j-channel...

(it's a crude drawing I know...)
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Old 07-09-2012, 09:54 AM   #7
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Proper way to Cap Windows with Siding already in place


yup that's a good way
if your careful at the head
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Old 07-09-2012, 10:06 AM   #8
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Proper way to Cap Windows with Siding already in place


A simple L shape slid in under the J moulding is the way I would go.
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Old 07-09-2012, 10:39 AM   #9
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yes that would be easiest for the o.p.
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Old 07-09-2012, 10:52 AM   #10
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Proper way to Cap Windows with Siding already in place


I'd hem the window side.

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