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Old 11-03-2012, 05:19 PM   #1
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Replacement skylight installation


Hi guys,

I'm getting ready to have an installer replace old skylight with new VELUX one. Getting new skylight with laminated glass. Roofing installer and manufacturer both say my roof type doesn't need a flashing kit: old skylight's removed and new one simply installed on top of the existing curb, my understanding.

So, wondering from the soundproofing stand point, is there anything I can ask the installer for or provide with to make sure that the new skylight & installation is as soundproof as possible? Is there any caulking to be done, does he need to use green caulk, etc?

I'd appreciate any advice. Thanks!

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Old 11-03-2012, 08:07 PM   #2
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Replacement skylight installation


No additional provisions to be taken.

Standard sealant between the curb and the new unit will do a good enough job of blocking and air leakage and sound transmission.

You will still get some noise via the curb and the wood will transmit the vibrations quite easily.

The laminated glass will help with the noise through the glass though.

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Old 11-03-2012, 10:47 PM   #3
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No additional provisions to be taken.

Standard sealant between the curb and the new unit will do a good enough job of blocking and air leakage and sound transmission.
Great! That's what I kind of thought too but what do I know. Thanks for confirming it for me. I appreciate it.

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You will still get some noise via the curb and the wood will transmit the vibrations quite easily.
Yeah, that makes sense. I assume you're mostly talking about low frequency noise. Do you think having him apply strips of some kind of sound dampening material on the curb would help at all? Not sure how that could be applied though. Curb is taller than the skylight by quite a bit so it'd have to be on the inside. That would make it look odd/seen unless painted over to match. I'm just speculating here btw.
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Old 11-04-2012, 07:34 AM   #4
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Replacement skylight installation


I would just go with the laminated skylight for now and see what benefit that nets you.
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Old 11-04-2012, 04:09 PM   #5
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Replacement skylight installation


Yeah, may have to take it one step at a time.

I see you're local. Will definitely keep that in mind.

Thank you for your help.
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Old 07-04-2015, 08:52 PM   #6
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Replacement skylight installation


Resurrecting this old thread of mine...

Thinking about adding a 2nd window installed in skylight's frame, sitting roughly 5" below skylight itself. I can get that window made at the local shop. My concerns is with potential moisture build up between new window and skylight and how to mitigate that.

I'd appreciate any thoughts or suggestions. Thanks and happy 4th!
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Old 07-04-2015, 10:20 PM   #7
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Replacement skylight installation


No real to mitigate that except to make sure that the glass is super tight and well sealed. Keep in mind, I have seen it done and it usually winds up backfiring.

Can you put some desiccant in there?
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Old 07-05-2015, 09:57 AM   #8
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No real to mitigate that except to make sure that the glass is super tight and well sealed. Keep in mind, I have seen it done and it usually winds up backfiring.
What kind of backfire did you have to deal with?

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Can you put some desiccant in there?
I think I can, if I make new window frame wide enough. I can then leave it in the corners and none one would ever be able to see it up there.

Thanks.
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Old 07-05-2015, 10:39 AM   #9
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Trapped moisture in the airspace. Condensation on the glass.
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Old 07-05-2015, 10:46 AM   #10
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Trapped moisture in the airspace. Condensation on the glass.
Right... I was thinking leaving some weep holes for moisture to escape but that would sort of defeat the purpose of sound proofing.
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Old 07-05-2015, 12:22 PM   #11
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Right... I was thinking leaving some weep holes for moisture to escape but that would sort of defeat the purpose of sound proofing.
Yeppers...as well as the moisture control.
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Old 07-09-2015, 08:54 PM   #12
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Replacement skylight installation


I would have him use some rubber strips or at least green glue --NOW is the time- insulating it from the wood curb which has step flashing against it- a little more sound-proofing at lower freq., I would think; http://www.greengluecompany.com/how-...exterior-noise

The new window is not air-tight, as said already. The trunk/chase may need insulation in the attic, often over-looked. You could add some interior drywall (w. GG) to the chase only, stopping/muffling bouncing sounds there. Add trim at bottom to cover the added thickness.

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Old 07-09-2015, 09:19 PM   #13
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The trunk/chase may need insulation in the attic, often over-looked. You could add some interior drywall (w. GG) to the chase only, stopping/muffling bouncing sounds there. Add trim at bottom to cover the added thickness.
It did occur to me before as well so thanks for mentioning it. When I check the attic chase from the inside it sounded thin and hollow. It looks like some wood paneling to me. Oh and unfortunately I have no access to that part of the attic.
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Old 07-09-2015, 09:45 PM   #14
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Replacement skylight installation


Sounds like you need a new access hole... and to meet minimum safety code if attic falls under guidelines;http://publicecodes.cyberregs.com/ic...9_8_sec007.htm

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Old 07-09-2015, 09:55 PM   #15
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It's a 110 year old house with little attic clearance and more like 1/12 roof slope. Skylight is in the middle of the house so by then clearance is getting low. I looked around the attic's high point, and that's calling it lightly as I can't even stand up in there, and there is no way I can get to the skylight.

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