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Old 06-14-2012, 04:21 PM   #16
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installing new skylight w/curb on top of old and bigger curb


actually, i just got done with just some aviator snips and a plain hooked knife. wadn't too bad. pictures to follow as soon as my camera battery charges

thanks

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Old 06-14-2012, 04:49 PM   #17
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installing new skylight w/curb on top of old and bigger curb


This EternaBond and Karnak #19 Ultra, do they sell them at the Roof Center or do you have to order online ?
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Old 06-14-2012, 06:00 PM   #18
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installing new skylight w/curb on top of old and bigger curb


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This EternaBond and Karnak #19 Ultra, do they sell them at the Roof Center or do you have to order online ?
If the 'Roof Center' is a roofer's supply house, I'd think so. If not, Google Bradco, Allied Builders Supply, ABC Supply of the like. One of them will have it.
I've never shopped for professional stuff at HD, or the other one, so I have no idea what they stock.
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Old 06-14-2012, 06:17 PM   #19
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installing new skylight w/curb on top of old and bigger curb


can i use the tape that came with the Velux flashing (i don't think they'll take the return cause i have unpacked it) instead of EternaBond for the temporary patch?
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Old 06-14-2012, 06:43 PM   #20
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installing new skylight w/curb on top of old and bigger curb


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can i use the tape that came with the Velux flashing (i don't think they'll take the return cause i have unpacked it) instead of EternaBond for the temporary patch?
It's an underlay. UV will kill it. And it may not be compatible with the APP you have now. I know it isn't meant to be exposed, nor used on an APP mod-bit roof.
My answer is 'No.'
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Old 06-15-2012, 04:32 PM   #21
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installing new skylight w/curb on top of old and bigger curb


here are the pictures of the latest developments.

i trimmed a perimeter around the hole (cca 3" give or take on all sides), and cleaned it all down to the wood.

then i made a 3/4" OSB adapter lid on top of which i set the curb. (the metal brackets from the picture are just temporary, will screw it from the plywood into the 2x6).

this does leave some marginal gap between the new OSB and the old mod bit roofing, which i plan to temporarily patch with EternaBond.

i am posting this to get a confirmation from you that it is all done right and that torched tar, as the permanent solution, will be able to seal the gap and keep it water tight. if i need to do something else, like e.g. put some sheet metal in between the old roof sheathing 1x lumber and the OSB lid or something like that, please let me know.

thanks
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installing new skylight w/curb on top of old and bigger curb-new_curb_on.jpg   installing new skylight w/curb on top of old and bigger curb-trimmed_opening.jpg   installing new skylight w/curb on top of old and bigger curb-trimmed_opening_detail.jpg  
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Old 06-15-2012, 05:19 PM   #22
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installing new skylight w/curb on top of old and bigger curb


1/4" is too much of a gap for mod-bit. It needs to be tight. It would have been better to just reinstall the cut out pieces of mod-bit instead of using OSB to raise the level to match the existing. Am I missing something?
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Old 06-15-2012, 05:21 PM   #23
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installing new skylight w/curb on top of old and bigger curb


Is the OSB on top of the existing sheathing?
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Old 06-15-2012, 05:24 PM   #24
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installing new skylight w/curb on top of old and bigger curb


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It would have been better to just reinstall the cut out pieces of mod-bit instead of using OSB to raise the level to match the existing. Am I missing something?
it needed a panel adapter, which is what the OSB does. "the cut out pieces of mod-bit" were like a mess, like 100s of little geometrically irregular shredded or chopped pieces.

can i fill the gap with something else before pouring the new tar? the lines of the cut out mod-bit were irregular, naturally, and the panel had to be an approximation, i.e. had to have some sort of spacing on all sides to make sure it fits.
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Old 06-15-2012, 05:25 PM   #25
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installing new skylight w/curb on top of old and bigger curb


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Is the OSB on top of the existing sheathing?
yes, it is
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Old 06-15-2012, 05:32 PM   #26
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installing new skylight w/curb on top of old and bigger curb


the OSB panel adapter was needed because the old 1x sheathing had warped as it is 100 y.o. and the new curb couldn't really sit on it firmly, it needed something to level it at least to some degree.

man, this is a big time retrofit, not new construction... geometric regularities are rare
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Old 06-15-2012, 05:34 PM   #27
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installing new skylight w/curb on top of old and bigger curb


You have a larger piece of OSB you can cut to exactly fit the hole?
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Old 06-15-2012, 05:37 PM   #28
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installing new skylight w/curb on top of old and bigger curb


Ideally, if you know the OSB size, you lay it on top of the area to be cut and using a knife, cut an exact matching hole. You may just have to use the scrap and pack it into the gap at this point.
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Old 06-15-2012, 05:40 PM   #29
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You have a larger piece of OSB you can cut to exactly fit the hole?
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.

man, i really believe in providing for a margin of error, especially when you have to cut something to fit somewhere whose shape is not exactly geometrically straight. every time i try to make something fit exact, i have to go back and forth and cut it more, trim it, plane it, sand it, jigsaw it and it is frikkin annoying. so i'd rather make it a little smaller and then fill the gaps.

which explains why i HATE cutting subflooring panels and, to a minor degree, drywall (cause it is easier to cut and adjust).
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Old 06-15-2012, 05:41 PM   #30
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installing new skylight w/curb on top of old and bigger curb


If you have the new APP, cut slices to fill the void.

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