Raw fiberglass: how to close up a roof vent hole - Fiberglass RV
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Old 02-07-2024, 04:08 PM   #1
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Name: Art
Trailer: 2001 Scamp 13
NC
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Raw fiberglass: how to close up a roof vent hole

I'm doing a complete frame up resto of a 13 Scamp. It looks like the previous owner made the original hole in the roof smaller to install the AC unit. They took a piece of plywood and fiberglassed it in to make a 14" square hole for the AC. Then they added a piece of rubber roof material on top of the roof to seal the new patch.

I will be installing a MaxxFan in this location. However, the piece of plywood they added is straight and doesn't follow the curvature of the roof, so it looks like the roof sags in this spot.

I have a couple of ideas but... What would be the correct way to fix this? I have a piece of a gel coated fiberglass to cover the original larger hole (from the shower wall section I took out). I've done a bunch of fiberglassing already so I'm not afraid to cut a bigger hole and start over. How would I go about making the new section follow the curve of the roof? I'd also like to get rid of the rubber roof material.

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Old 02-18-2024, 08:44 AM   #2
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Name: Paul
Trailer: 1966 Buco Industries
Alberta
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Morning Artcamper,
There are lots of videos and information on how to repair fiberglass on the internet.
I filled the hole where the old gravity furnace went into the side of my camper. The hole was about 14 inches across, so similar to your opening. I got a piece of the pink foam insulation board, slit it about 3/4 of the way through in several places and then duct taped it to the inside wall. The slits allowed it to curve to the wall. I also put some temporary wood bracing to keep it in place. Then it is just a matter of building up the layers of fiberglass and resin until you get the proper thickness. Some auto body filler to smooth things out and paint and it will look like new.
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Old 02-18-2024, 09:11 AM   #3
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I like the foam board idea. I'm going to need to cut out the previous plywood patch first so the hole is going to be larger than 14x14 but in general the process should be pretty similar.
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Old 03-03-2024, 12:04 PM   #4
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Name: Hugh
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resizing roof holes

scamp sells fiberglass panels that they cut out for windows and vent openings, you could order one of these panels and use close ended pop rivets and washers. they have larger panels than the ones listed in they're parts store. you will also need a good sealant





https://www.fiberglassrv.com/forums/...mp-100111.html



https://www.scamptrailers.com/produc...berglass-panel



https://www.amazon.com/Closed-Sealed...ERX4DKC37&th=1
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Old 03-03-2024, 12:17 PM   #5
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Quote:
Originally Posted by hghsl View Post
scamp sells fiberglass panels that they cut out for windows and vent openings, you could order one of these panels and use close ended pop rivets and washers. they have larger panels than the ones listed in they're parts store. you will also need a good sealant
That would work too. I'd rather not rely on rivets and sealant though, so I'm just going to cut the plywood out, fiberglass the hole, then cut a new hole for the vent. I'm also going to fiberglass a 3/4" plywood frame for the MaxxFan to the top of the roof so that it doesn't take away any headroom space inside.
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