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Old 11-05-2010, 01:05 PM   #11
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I was thinking of putting a Maxx Air vent cover on for added protection and the ability to run the fan in the rain. However the sealant is so built up that the mounting brackets would have to be bent to be seated on the roof so the bolts can hold the cover on. The only other way is to cut the caulk down to the base where the brackets would go and then recaulk over the brackets. Any thoughts on the best way to go here?
You should not just caulk over the old caulk. Correct way is to remove as much of the old caulk as possible and recaulk using the apropriate amount. As was mentioned above, often times too much caulk can cause a leak as much as it can help prevent one. Also make sure any EPDM gasket materials are in good shape (replace as needed). Finally make sure to use the highest quality silicone caulk for maximum adhesion and clean the area thoroughly prior to caulking.
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Old 11-05-2010, 01:26 PM   #12
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Finally make sure to use the highest quality silicone caulk for maximum adhesion and clean the area thoroughly prior to caulking.
If you think you might ever want to apply Eternabond tape, keep in mind that it will NOT stick to anything with silicone in it. Even cleaning with a silicone-based cleaner can leave enough silicone residue so that Eternabond won't stick.
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Old 11-05-2010, 02:20 PM   #13
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After checking the Fan Tastic site they don't recommend installing a vent cover. The Maxx Air cover and other comparable brands only have a height of 9 1/2" so the fan cover can't open all the way.

We tend to use the fan quite a bit on days when we don't run the AC. When it rains it would be nice to have the cover. In spite of what Fan Tastic says what's the consensus on installing or not installing the cover?
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Old 11-05-2010, 02:55 PM   #14
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Originally Posted by bmg View Post
After checking the Fan Tastic site they don't recommend installing a vent cover. The Maxx Air cover and other comparable brands only have a height of 9 1/2" so the fan cover can't open all the way.

We tend to use the fan quite a bit on days when we don't run the AC. When it rains it would be nice to have the cover. In spite of what Fan Tastic says what's the consensus on installing or not installing the cover?
I installed a MaxxAir 2 cover. It's bigger than the regular MaxxAir. Seems big enough for me, even on the fan's highest setting. It's true that the vent doesn't open quite as high as it would without the MaxxAir.
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Old 11-05-2010, 07:24 PM   #15
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You should not just caulk over the old caulk. Correct way is to remove as much of the old caulk as possible and recaulk using the apropriate amount. As was mentioned above, often times too much caulk can cause a leak as much as it can help prevent one. Also make sure any EPDM gasket materials are in good shape (replace as needed). Finally make sure to use the highest quality silicone caulk for maximum adhesion and clean the area thoroughly prior to caulking.
Never use silicone on your roof.
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Old 11-05-2010, 07:27 PM   #16
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If you think you might ever want to apply Eternabond tape, keep in mind that it will NOT stick to anything with silicone in it. Even cleaning with a silicone-based cleaner can leave enough silicone residue so that Eternabond won't stick.
I've used it on my last to trailers never a problem, first one i used eturnaclean, second one i used asitone on a grag ( I put over 30,000 miles in that trailer) as i stated before it needs to be done correctly.
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