Good Sam Club Open Roads Forum: Dicor lap sealant or Eternabond tape for new roof vent
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 > Dicor lap sealant or Eternabond tape for new roof vent

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mobeewan

Hampton, Va

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Posted: 03/03/21 02:03pm Link  |  Quote  |  Print  |  Notify Moderator

I'd put butyl tape under the flange to protect the membrane from the flange then use Eternabond.

Cummins12V98

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Posted: 03/03/21 03:28pm Link  |  Quote  |  Print  |  Notify Moderator

mobeewan wrote:

I'd put butyl tape under the flange to protect the membrane from the flange then use Eternabond.


Personally I would wet set into Dicor as it gives another layer of protection from water entering.


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mr_andyj

Georgia

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Posted: 03/03/21 08:30pm Link  |  Quote  |  Print  |  Notify Moderator

Lap sealant! hands down, Lap sealant!!!
I have used both, and both are excellent, and the tape is incredible in its holding ability.
I have used both for enough years that I have had to remove both many times. The tape is a nightmare to remove, requires a heat gun, and always leaves a residue or "stain" of stuff that is hard to get off. Sometimes it comes off clean for a few inches, then other times it sticks as a mess.
Lap sealant comes off with a scraper or putty knife. Leveling lap sealant flows into all the nooks and is much better sealing odd shapes where the tape will never seal. Tape only seals flat surfaces, where two surfaces meet (like the vent flashing) you will need a bit of lap sealant to keep tape from leaking.
Tape should only be considered when you need that extra strong bond. IF you can make lap sealant work then use lap sealant.

LittleBill

Scranton, PA USA

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Posted: 03/06/21 05:39am Link  |  Quote  |  Print  |  Notify Moderator

can dicor be placed over old dicor, or does it all have to be removed to work?





Cummins12V98

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Posted: 03/06/21 08:08am Link  |  Quote  |  Print  |  Notify Moderator

LittleBill wrote:

can dicor be placed over old dicor, or does it all have to be removed to work?


Clean it good with Acetone then apply right over.

JIMNLIN

Oklahoma

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Posted: 03/07/21 06:19am Link  |  Quote  |  Print  |  Notify Moderator

Be careful about building up height (over old sealant) of lap sealant around roof fixtures/jacks/etc. This can cause water to pool (lake effect) and a future source of water intrusion. BTDT ...I was a member of "more is better" crowd and it was a expensive lesson.


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Cummins12V98

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Posted: 03/07/21 10:00am Link  |  Quote  |  Print  |  Notify Moderator

JIMNLIN wrote:

Be careful about building up height (over old sealant) of lap sealant around roof fixtures/jacks/etc. This can cause water to pool (lake effect) and a future source of water intrusion. BTDT ...I was a member of "more is better" crowd and it was a expensive lesson.


Good point!

I have always removed all the old Dicor possible and then apply new.

deltabravo

Spokane, WA

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Posted: 03/07/21 08:34pm Link  |  Quote  |  Print  |  Notify Moderator

Butyl tape under the flange, Dicor on top.

Dicor under the flange is a disaster when it comes time to replace the roof vent.

This is how I do it.


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mwachel

UT

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Posted: 03/10/21 03:29pm Link  |  Quote  |  Print  |  Notify Moderator

Dicor for the ease of removal if necessary. You should be getting on the roof a couple times a year minimum for inspection anyway. Re-sealing with Dicor should be easy if needed.


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rlw999

Washington State

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Posted: 03/10/21 04:05pm Link  |  Quote  |  Print  |  Notify Moderator

I should have looked at the fan before I asked this question, I assumed it would have a nice wide flange like the fan it replaced, but it has a plastic flange (narrower at the front) with a couple of projections on each side of the flange that extend to the edge of the flange. So instead of a nice uninterrupted segment of Eternabond tape, I'd end up with notches in it that I'd have to cover well with Dicor anyway.

So, I just used the Dicor and didn't bother with the tape.

Thanks everyone for your advice!

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