Good Sam Club Open Roads Forum: Truck Campers: Sealing my TC's EPDM Roof
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 > Sealing my TC's EPDM Roof

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Hemi Joel

Minnesota

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Posted: 07/22/22 10:20pm Link  |  Quote  |  Print  |  Notify Moderator

I am a commercial/industrial roofing contracor. We have installed millions of square feet of EPDM on flat roof buildings over the last 40 years. Believe me, you do not need to coat EPDM. A good EPDM will last over 30 years before it starts to break down. The problem with an RV roof is the penetrations. If I flashed commercial roof penetrations the way RV manufactures do, I'd be in prison. So maintain your penetrations. Do not let any cracks go, inspect often, do not let any water get under your roof. Water under the roof breaks down the surface of the underlayment and the bond to the EPDM will be lost. Dicor works fine at keeping up on them. The biggest enemy of EPDM is oil. Do not repair it with asphalt plastic cement, or anything oily, and do not clean it with anything oily. It is not necessary to clean your roof, but if you feel like you want to just because, use mild soap and water. I have 35 year old roofs that have never been cleaned. But DO scrub the repair areas clean with soap and water and a scotchbrite pad before applying the Dicor, this will help it stick.


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gitpicker2009

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Posted: 07/23/22 01:46pm Link  |  Quote  |  Print  |  Notify Moderator

There's a company here in Houston that will remove your old rubber EPDM roof and replace it with a spray on bedliner type product, which is nearly indestructible. When my roof gets old enough to need repairs, that's what I'm going to do. And their pricing was unbelievably LOW compared to doing another rubber roof. You should see if there are people in your area that offer that service.

notsobigjoe

southeast

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Posted: 07/23/22 04:00pm Link  |  Quote  |  Print  |  Notify Moderator

I would like a product that perhaps could spray over the EPDM and make the rain a little quieter. Off topic but I wonder...

Hemi Joel

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Posted: 07/25/22 04:44pm Link  |  Quote  |  Print  |  Notify Moderator

If your spray on bedliner leaks into your truck bed, you don't know or care.

Nobody tosses heavy tool boxes or cinder blocks onto, or drags chains across their camper roof.

I would stick with a product designed and proven for the application. There is no better product for a low-slope roof than EPDM.

rhagfo

Portland, OR

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Posted: 07/25/22 05:06pm Link  |  Quote  |  Print  |  Notify Moderator

wanderingbob wrote:

HENGS
Heng’s

I used as well and really like it. Scrubbed roof with Tide powdered detergent first rinsed well then applied the next day, two thin coats per instructions.


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mkirsch

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Posted: 07/26/22 08:51am Link  |  Quote  |  Print  |  Notify Moderator

Hemi Joel wrote:

If your spray on bedliner leaks into your truck bed, you don't know or care.

Nobody tosses heavy tool boxes or cinder blocks onto, or drags chains across their camper roof.

I would stick with a product designed and proven for the application. There is no better product for a low-slope roof than EPDM.


It's a spray on bedliner "TYPE" product, as in something that sprays on thick. Not necessarily bedliner.


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sonuvabug

Mid-West Ontario, Canada

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Posted: 08/06/22 02:52pm Link  |  Quote  |  Print  |  Notify Moderator

Thanks All. I appreciate you sharing your insights ...


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BigSwick

FL

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Posted: 08/07/22 02:03pm Link  |  Quote  |  Print  |  Notify Moderator

Hemi Joel wrote:

I am a commercial/industrial roofing contracor. We have installed millions of square feet of EPDM on flat roof buildings over the last 40 years. Believe me, you do not need to coat EPDM. A good EPDM will last over 30 years before it starts to break down. The problem with an RV roof is the penetrations. If I flashed commercial roof penetrations the way RV manufactures do, I'd be in prison. So maintain your penetrations. Do not let any cracks go, inspect often, do not let any water get under your roof. Water under the roof breaks down the surface of the underlayment and the bond to the EPDM will be lost. Dicor works fine at keeping up on them. The biggest enemy of EPDM is oil. Do not repair it with asphalt plastic cement, or anything oily, and do not clean it with anything oily. It is not necessary to clean your roof, but if you feel like you want to just because, use mild soap and water. I have 35 year old roofs that have never been cleaned. But DO scrub the repair areas clean with soap and water and a scotchbrite pad before applying the Dicor, this will help it stick.


Is the commercial EPDM the same thickness as what is on most RVs?

Hemi Joel

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Posted: 08/07/22 08:50pm Link  |  Quote  |  Print  |  Notify Moderator

The most common thickness in commercial is 60 mil, which is .060 in thick. It is also available in 45 mil and 90 mil. I'm not sure what thickness they use on an RV.

sonuvabug

Mid-West Ontario, Canada

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Posted: 08/22/22 11:05am Link  |  Quote  |  Print  |  Notify Moderator

Hemi Joel wrote:

The most common thickness in commercial is 60 mil, which is .060 in thick. It is also available in 45 mil and 90 mil. I'm not sure what thickness they use on an RV.


mil mm inch

60 1.524 0.06 1/16 in

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