Coating over old PVC type membrane

Hoping someone can give me some advise on what we might use to coat all or parts of a barrel roof that has some type of plastic roofing. We think it might be Sarnifel but there is nobody that knows. The membrane is about 30 years old so they have gotten their moneys worth out of it but they don't have the money to redo the roof. Its about 5000 square feet. The membrane has a fiberglass mesh that is exposed over large sections and the thin undercoat of plastic is starting to split and leaking. I have no experience with coatings on this type of roof and am looking for any advise I can get. Anybody willing to help?

Silicone is great stuff. Here is our Gaco rep, give him a call: Bobby Anderson 979-220-5932

I put down some GACO on this PVC roof about 16 months ago and it still looked great when I saw it about 3 months ago. I'm sure not buying that 50 year claim, but who knows. Also pricey, unless it is a 50 year roof.

Wow big, sorry but I'm not changing at the moment. :)

Also, I put Gaco Liquidtape down on most of this area and two coats of the regular after a tough cleaning to get ride of most grease.

Tim, Thanks for the lead. I will call him Monday. I did see the Gaco line through the ABC catalog. Just trying to get an idea what might be the best way to prolong the life of the roof.

A couple of questions if I may. Have you ever used it? Do you apply it with a spray gun?

You can roll it, but on larger jobs we spray it. It require 5-6,000 psi which brings injection injury risk into the picture.

Rolling it takes some care as it is moisture-cured and will clobber up on you after a while.

The stuff is great, unaffected by UV or ponding water. Very resilient, too.

You need a rep like Bobby to get you up to speed. He sprayed some of the SPF on the Superdome and is very knowledgable. Bobby will take good care of you.

Clvr, Big files, but once they loaded were just what I'm looking for. Looks to me like it was brush applied.

I will definitely call him.

Vaa: I'm happy to fix them :) I was so tired I almost didn't reply at all last night. Didn't think there would be so many replies that quick! Your's looks good Vaa, but I'm curious as to why you(single ply champ nominee) did that compared to a normal patch? Was this a different scenario, or to save money for the client?

GKRFG: We brush applied the Liquidtape and then rolled on the Gaco. You can see some gray coating, that's the first layer of Gaco. It really helps you to know where you've been when applying your second coat.

No doubt about it, silicone is slick as snot. It is slick when dry, and like ice when wet. We intend to embed a few granules 5' wide on edges where someone might be at risk falling hanging Christmas lights or something.

And, nothing sticks to silicone but silicone. This will be leverage with adjusters who want to knock our price down.

Another note: When I put some of this on in ~90 degree weather, it dried before a small rain hit us an hour later. In 50 degree weather it was still wet a few hours later.

Vaa said "Bit of a worry about that PVC failing and the mesh showing through clvr83, how old was that?"

No clue, these guys don't give me any information like that. I assumed it was from grease because no other spots are worn through like that except near the grill exhaust to the drain.

I'm going to agree with the Gaco, I've been coating old Durolast and its been working great. covering lots of old spider webbing leaks.

GSD Said: Im going to agree with the Gaco, Ive been coating old Durolast and its been working great. covering lots of old spider webbing leaks.

Looks like a decent repair option for old membranes. do you have to put any type of primer before applying the Gaco..? What about epdm. Will this Gaco stuff work on epdm..?

Yes, works over EPDM too. We prime just about everything coz it's just 6 cents a foot + labor and cheap insurance. Other guys just do an adhesion/pull test.