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Old 06-15-2012, 06:42 PM   #31
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installing new skylight w/curb on top of old and bigger curb


"i could do that, however, can't i just stuff something in the gap, like the foamy backer rod by Sika before pouring the new tar."
THe new APP will be applied with an open propane flame and that stuff will torch the house when it lights.

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Old 06-15-2012, 06:46 PM   #32
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I have to run. Hopefully, Old and Broken or one of the others can also add/give some tips while I'm out.

Last edited by tinner666; 06-15-2012 at 09:36 PM. Reason: Deletion
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Old 06-15-2012, 06:48 PM   #33
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installing new skylight w/curb on top of old and bigger curb


The gap could be filled with the 19 ultra and cover with eternabond, as a short term fix. I have no idea if APP can be torched over eternabond. Give a call please, I have to run. It's my cell.
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Old 06-15-2012, 06:50 PM   #34
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installing new skylight w/curb on top of old and bigger curb


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If you have the new APP, cut slices to fill the void.
what is APP ?
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Old 06-15-2012, 07:00 PM   #35
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installing new skylight w/curb on top of old and bigger curb


i mean, how viscous is hot tar? i would imagine it has the consistency of oatmeal. which means it wouldn't straight drip through small cracks and should be able to fill larger gaps ...

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Old 06-15-2012, 09:36 PM   #36
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installing new skylight w/curb on top of old and bigger curb


Ok. I'm back. Drop the eternabond.

Get 4 pieces of OSB about an inch longer than your cut out sections of roof.

Make them about 6" wide. We're, you, going to make cant strips for the 4 sides.

Get 18" Peel and Seal and cut off 4 pieces that are about 16" or more longer than your roof cuts.

More........

Last edited by tinner666; 06-15-2012 at 10:29 PM.
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Old 06-15-2012, 10:21 PM   #37
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installing new skylight w/curb on top of old and bigger curb


In case I'm mistaken, correct me. I've assuming you DON'T have the specialized equipment to apply APP. All my answered are based on you NOT having the equipment, have taken the training courses, gotten experience, gotten the open flame permits, etc? If you have, I'll change my directions accordingly.

Now, Cut the bottom sides of your OSB strips at a 35 degree angle all the way down their lenght. The plan is to lay then along the cut roof edge, with the top edge lying tightly against the SL curb. Then mark the top corner at each end, and cut the angle, with the saw bevel set at 45 degrees.
If the centers feel flimsy, just add pieces of underneath wood in the middle of each leg to firm them up.
Screw or nail them all the way around the box.
Now is the time to find out if the wood and/or the APP needs to be primed!
Starting at the lowest side, take the first piece of P&S and starting at the top edge of the curb, press into place as you rotate it gently and smoothly down the sides, over the cant, and onto the roof. At the apexes of the cant, make a simple straigth cut 'outwards, and press the P&S into place. THis is called wrapping the corners. Now, do the same for the two ends, and then the highest side of the box. If your cuts are exactly on those apexes, marked in black, you might not even need to caulk the thing.

You could wrap it twice and I'm sure it WILL be free of leaks! Might have to prime it to do so!
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Old 06-15-2012, 10:23 PM   #38
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installing new skylight w/curb on top of old and bigger curb


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what is APP ?
Mod-bit.

There are two main types of mod-bit; APP and SBS. Neither is compatible with the other! Nor are their other componets.
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Old 06-15-2012, 10:37 PM   #39
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installing new skylight w/curb on top of old and bigger curb


I drew in the area covered by one piece of corner warp P&S. It's marked in green on one side of the box. The cuts I mentioned before go about like I marked in yelow. Each succeeding wrap will overlap each corner about 8" AND cover the cuts in the prior piece.
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Old 06-16-2012, 08:18 AM   #40
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installing new skylight w/curb on top of old and bigger curb


Once you've done all that, cut some strips of P&S about 5" wide and ?maybe?? 8" long. Measure first! start at the bottom of each corner, about 2" onto the flat of the roof, and run them up the ridges of the cant strip. I doubt that they will flex well enough to go all the way to the top in one run. If not, just go past each apex marked earlier, starting from the bottom, about 2" out, and overlap at the apexes by about 2". It won't leak now.
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Old 06-16-2012, 10:52 AM   #41
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installing new skylight w/curb on top of old and bigger curb


Sorry I haven't been able to help Frank, I've been doing some Forest Service jobs and no phone or internet for the last few weeks. Looks like you are doing just fine for a broken-down tinbender though.

If he hasn't cut the wood cants already and has a local roofing supplier, I would recommend seeing if they have some wood-fiber cant strips he can just set in mastic around it. Instead of torching the new curb he could also get a compatible cold-process and cap sheet to flash the new curb. I believe GAF matrix may be fine for that application. Lessens the chance of burning the bldg down too. A hot-tar will just shock that existing system and he will end up with a huge mess and failed roof on his hands.

Last edited by OldNBroken; 06-16-2012 at 10:56 AM.
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Old 06-16-2012, 10:52 AM   #42
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installing new skylight w/curb on top of old and bigger curb


Is there an 18" eternabond available to you? It's possible the job can be done with either product. I'm not familiar with either though I see others using them both around here. I guess either could last a year or more.
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Old 06-16-2012, 10:58 AM   #43
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installing new skylight w/curb on top of old and bigger curb


Eternabond is a great product for emergency repairs but should never be considered permanent unless your roof is on wheels.
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Old 06-16-2012, 11:02 AM   #44
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btw, very nice explanations on the cant strips and cutting and wrapping the flashings.
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Old 06-16-2012, 03:25 PM   #45
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Originally Posted by tinner666 View Post
Now, Cut the bottom sides of your OSB strips at a 35 degree angle all the way down their lenght. The plan is to lay then along the cut roof edge, with the top edge lying tightly against the SL curb. Then mark the top corner at each end, and cut the angle, with the saw bevel set at 45 degrees.
i am very confused by this, both how to actually execute, what to accomplish and why it is needed. i don't doubt you are right, i am just confused

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