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Open Roads Forum  >  Do It Yourself Modifications and Upgrades (DIY)

 > Acrylic sheet to replace skylight bubble?

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cannesdo

Presently in Encinitas, CA

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Posted: 07/08/22 07:14pm Link  |  Quote  |  Print  |  Notify Moderator

I'm selling my Alpenlite 5th wheel. I can't find a replacement skylight bubble for it and the old one is on its last legs so I had the idea to replace it with just a flat sheet of acrylic. That would work, wouldn't it? It's 30x38". How thick would you want the acrylic to be? I'm thinking at least 1/4". And acrylic or polycarbonate?

Thanks much...

agesilaus

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Posted: 07/08/22 07:52pm Link  |  Quote  |  Print  |  Notify Moderator

Make sure you get the sealant problem fixed. We went thru this on a house skylight and never got it sealed and it always leaked. Finally covered it over with roofing.
So look at how it is sealed now and duplicate that, don't spare the sealant. I'd use at least 0.25in lexan. And if there is a curb above the roof surface, preserve that.
Our two skylights are hazed over but we aren't looking out of them and they aren't leaking. If it ain't broke don't fix it. Engineering law.


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cannesdo

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Posted: 07/08/22 09:26pm Link  |  Quote  |  Print  |  Notify Moderator

agesilaus wrote:

Make sure you get the sealant problem fixed.
..... And if there is a curb above the roof surface, preserve that.


Thanks for the input. I have the self-settling sealant which works well. If there's a curb? What do you mean by that? The frame that was around the old bubble? Yes, I'm going to replace that. But I may need a machine shop to router the edges of the acrylic so they are thinner and can accommodate the frame then caulk around it as usual. It just won't be a bubble window like before.

* This post was edited 07/08/22 09:51pm by cannesdo *

wildtoad

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Posted: 07/09/22 04:54am Link  |  Quote  |  Print  |  Notify Moderator

Once I bought a used MH and the po had replaced bathroom skylight with a flat piece of plastic/acrylic. As I recall they had build a frame to raise the sheet off the roof just a bit. I think the reason was to allow for the headroom lost when you remove the inner and outer bubble. May not be a problem if skylight is not in the shower. What are your plans to dress up the hole on the inside.

I think “curb” should read “curve”. I’m not sure it matters as I don’t believe the bubbles have a curved bottom.


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Posted: 07/09/22 07:21am Link  |  Quote  |  Print  |  Notify Moderator

Polycarbonate, NOT acrylic. Poly will take hail and not haze or yellow with age.

WNYBob

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Posted: 07/09/22 07:44am Link  |  Quote  |  Print  |  Notify Moderator

I used butyl tape as the first layer of sealant, then screw it down, and then seal the edges with self leveling sealant!

opnspaces

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Posted: 07/09/22 07:57am Link  |  Quote  |  Print  |  Notify Moderator

Will this work? not cheap and a little bit larger. But if the inner dome hides that it's larger I would think it would not matter.
Link
The measurements on the picture don't match the measurements in the description so you might need to reach out to them and ask which is correct.

They also seem to offer a custom skylight creation for $239 if you have to go that route.
Custom


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agesilaus

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Posted: 07/09/22 09:15am Link  |  Quote  |  Print  |  Notify Moderator

wildtoad wrote:

As I recall they had build a frame to raise the sheet off the roof just a bit.


That is the curb and it's purpose is to raise the seal off the roof to prevent water puddling on top of the seal and working it's way thru the seal eventually.

garyemunson

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Posted: 07/09/22 04:57pm Link  |  Quote  |  Print  |  Notify Moderator

https://www.eztopsworldwide.com/rvskylights.htm

Bird Freak

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Posted: 07/09/22 05:13pm Link  |  Quote  |  Print  |  Notify Moderator

Have you checked Amazon for the correct skylight? Thats where I got mine.


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