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Old 03-01-2008, 09:10 AM   #1
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Roof repair over silicone?

I want to reseal the seams on my roof. They are cracking. There was a fairly recent repair done to a couple 12" seams done by the previous owner and he used silicone. Can I go right over the top of this with a good (and proper) seam sealant, or do I have to try and scrape it off? For that matter do I have to try and scrape off the original sealant too?

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Old 03-01-2008, 12:13 PM   #2
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Scott,

I would take all the old silicone off, and I would also try to take the old seam sealant off. I don't think you need to take ALL the old seam sealant off, just take the stuff off that seems loose.

Jon
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Old 03-01-2008, 03:57 PM   #3
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Re: Roof repair over silicone?

Quote:
Originally Posted by ScottK
I want to reseal the seams on my roof. They are cracking. There was a fairly recent repair done to a couple 12" seams done by the previous owner and he used silicone. Can I go right over the top of this with a good (and proper) seam sealant, or do I have to try and scrape it off? For that matter do I have to try and scrape off the original sealant too?

Thanks!
Scott, Jon is right, anything that has been added since it was built is suspect, and should scraped as best you can. Original sealant should be scraped, too, at least to remove any that is flaked or loose.

The basic rule of thumb is that you should dealing with as few different materials up there as possible so that you get good adhesion with your new sealant. If there are too many different sealants, etc., something is pretty much guaranteed not to stick somewhere. Murphy's Law, basically.
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Old 03-01-2008, 10:04 PM   #4
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As others have said, definitely remove the silicone and any other loose sealant that is on the roof. I would then suggest you look at using Eternabond on all the seams on the roof. Eternabond has received a lot of positive reviews. I am looking at using Eternabond on all the seams on my roof this year. Base on all the review I have read once done, I won't have to worry about redoing the seams for pretty much the life of the roof.
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Old 03-03-2008, 12:02 PM   #5
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Scott

I 4th the recommendation to get rid of the silicone. Silicone has itís place, but on the roof of a camper is not one of them. It is not a long term solution. It also messes up having the right stuff applied over it as the right stuff can only adhere to what is under it.

I do not know your 1988 model but I do know the newer ones with the rubber roofs. Is yours a metal roof or rubber roof?

The newer models with rubber roofs use Dicor as the lap sealant. I have used this on mine and it works very good. If this is what you have it can easier removed with a little added heat. Like a hair dryer or paint strip gun. Do not get carried away with the heat, but it will soften it up and then it comes out a lot easier. Again this is on Dicor. So I do not know if this will help or not.

Looks like this. You need a tool that had is stiff but does not have a sharp edge to cut. This old chisel I have is duller then dull with a 1/32Ē radius on the end.





Hope this helps

John
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Old 03-03-2008, 01:59 PM   #6
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My roof is Aluminum.

Heat gun is a good idea for the old sealant! Not sure if it will help on the silicone...I'm afraid I will have a few choice words as I try to remove that stuff.
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