[18:54][18:54] Dallin: Hey William

[18:56][18:56] Dallin: RV roofs are usually not structural, but need to waterproof.

[18:57] Dallin: Are you taking the old fiberglass off?

[18:58] william: yes and putting thin plywood

[18:59] Dallin: Ok, I would use a layer of 1.5 oz chopped strand mat, with 6 in fiberglass tape along the seems.

[19:00] Dallin: I would use Orca 301 ISO resin with gel coat over top.

[19:01] william: will that hold weight of air conditioner or person walking on it

[19:02][19:02] Dallin: How big is the roof?

[19:04] william: The replaced section is approx. 7x12 feet entire roof is 7x30

[19:05] Dallin: Ok, so you are not replacing the whole roof.

[19:06][19:06] Dallin: I would probably use the same layup.

[19:07] Dallin: So, 10 yards of 3733 x 40" and 20 yards of CSM.

[19:08][19:08][19:08] Dallin: No problem.

[19:10] Dallin has left the conversation

[19:22] Dallin has joined the conversation

[19:23] Dallin: 1.5 oz Chopped Strand Mat. not cloth

[19:37][19:37] Dallin: 70

[19:38][19:38] Dallin: No problem

[20:01][20:01] Dallin: 10 OZ

[20:04] Dallin: Mix ratio depends on how fast you want it to cure. It is 2 oz per gallon, but you don't want to do a whole gallon.

[20:07] Dallin: You don't want to go lower than 1% MEKP.

[20:08][20:08] Dallin: To thoroughly mix it? 2 minutes is what the manufacturer says.

[20:09] Dallin: I would probably start at a pint, then work your way up. Get used to how the resin works.

[20:37] william: thanks Dallin I'm checking out

[20:38] Dallin: Great

[20:53] Dallin has left the conversation

By Dallin Leach 1 comment


comments (1)

  • jason389

    I am building a micro Rvr and want to fiberglass the plywood roof. There is plastic flashing tape over all the joints- do I need to remove this?

    Also, what weight and type of mat/ fabric do you recommend?

    Thanks in advance.

    -Jason in Atlanta

    REPLY from fgwarehouse: Hello Jason, I would remove the flashing tape. I could impede the bond.

    Chopped strand mat will be the cheapest. 6 oz cloth will be relatively smooth. Are you just looking to waterproof, or add structure?

    REPLY from jason389: Just waterproofing. There is plywood on the roof. Thank you.

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