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Old 03-31-2009, 03:45 PM   #29
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Quote:
Originally Posted by wppii View Post
Are the vent covers installed incorrectly in the first place?

To be honest wppii, I would not shock me in the slightest if they were installed incorrectly......

Great pics...I too seem to have a date with my roof this spring, I'll find out then how bad mine is and was installed.
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Old 03-31-2009, 08:10 PM   #30
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Quote:
Originally Posted by wppii View Post
Are the vent covers installed incorrectly in the first place?
Of course, my vent pipe only sticks up 1-1/2", so, unless I extend my vent pipe, I have to have the inner gasket. But it just doesn't seem to be properly installed.

Am I in left field here?
Sure looks like another case of.. "what you can't see, can't hurt 'ya."

This is how far ours came thru the roof, guess we were just lucky.

Did the Mothership see fit to install all the screws?
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Old 03-31-2009, 11:02 PM   #31
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Vent pipe fit

Bob,
Does the tail of the vent pipe sticking out of the roof 1.) stick out far enough and 2.) fit through the center hole of the vent cap base (albeit tightly) so that a seal can be made with the inner hole of the vent cap base?
Bill
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Old 03-31-2009, 11:10 PM   #32
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Perimeter screws.......

Bob,
It looks like the vent cap has capability of twice as many screws as were used in the installation. However, the unused screw holes are blocked off by the plastic casting. It's possible that the amount used were sufficient for the curvature of the roof at the installation point.
Bill
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Old 03-31-2009, 11:24 PM   #33
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Bill

1) It appears from your picture that the vent pipe was cut too short to seal properly in the cover.

2) I cut the hole in my gasket a little under size and ran a bead around the pipe under the gasket so it would seal better when the cover is replaced.

H Depot should have what you need to extend the vent pipe a little. You may have to cut a "custom" gasket to fit the slightly larger diameter. Take the piece you cut off and the cover with you so you can "fabricate" in the store.

On second thought it may be less frustrating to try a Mom & Pop first.
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Old 03-31-2009, 11:28 PM   #34
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My current tack....

...is to check diameter fit between pipe o.d. and vent cap i.d. I think it will match. Then I'll work on extending the vent pipe enough to get through the vent cap base opening. After that it should be a simple matter of a perimeter gasket for the vent cap base.
But first, a new vent cap, mine has cracks developing in it.
Pictures and all the info that's fit to print to follow............
Bill
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Old 03-31-2009, 11:38 PM   #35
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I think......

Quote:
Originally Posted by ROBERT CROSS View Post
Bill

2) I cut the hole in my gasket a little under size and ran a bead around the pipe under the gasket so it would seal better when the cover is replaced.
....that if the fit is right, there is no need to seal the id of the gasket against the pipe. The pipe will seal to the vent cap base (as designed).
Bill
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Old 03-31-2009, 11:55 PM   #36
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Quote:
Originally Posted by wppii View Post
Bob,
It looks like the vent cap has capability of twice as many screws as were used in the installation. However, the unused screw holes are blocked off by the plastic casting. It's possible that the amount used were sufficient for the curvature of the roof at the installation point.
Bill
Bill
I'm not quite sure of the "plastic casting" (fridge vent?) you mentioned. It looks like you have the same cover. You can see in this photo how well mine was sealed.
The Fridge vent does block two screws in the cover but it does seal ok.
I just used the cover as a template and drilled using a bit stop to keep from grabing any insulation, wires etc.
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“After all these years the reason I continue to love Thanksgiving.....I still sit at the kids table.”
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Sandra wanted to go to Cleveland on vacation,
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Old 04-01-2009, 12:11 AM   #37
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Plastic casting

It looks like every other hole in the perimeter of the base flange was filled with a mounting screw. The rest of the "holes" were still blocked off by the original casting process, i.e. never "poked out" in the first place. That's what I meant by plastic casting.

As with your unit, the refrigerator vent inteferes with a portion of the vent cap base.

Communicating a simple idea can be so difficult...

I'll have to take this up in the am, it's time for checking the ligh blocking abilities of my eyelids....gnite
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Old 04-01-2009, 07:54 AM   #38
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Just a thought that may or may not prove helpful.

On my Safari, what appears to be a vent pipe is accessible from a closet. I don't know for sure if it is "the" vent pipe, but if it is, you could in theory cut the vent pipe down below the roof line, then, you're extension would not be on the roof having to dance a gasket seal in place. In my case I don't see how it could not be the main vent pipe, but your mileage could vary. My tanks are aft and there are no hidden spaces other than the closet where the pipe has an out of sight place to make it's way up to the roof. Your unit could have a similar design. Might be worth investigating if you are thinking of extending the pipe from the rooftop.
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Old 04-01-2009, 06:31 PM   #39
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I was correct......

Attached, if it works right, is a pdf of the installation instructions for the vent. Got it from the vent manufacturer. It shows the pipe extending just through the center hole of the vent cap base and calls for a bead of sealant on the underside of the hole that is drawn into the joint as the base is slid down over the pipe.

Won't be able to go further till Saturday, called for OT today, working a 48 after that
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Old 04-01-2009, 07:25 PM   #40
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I take part of it back.......

No sealant required around pipe, tight enough mechanical seal around the pipe. The sealant goes around the flange where it contacts the roof, no gasket required.

For RobertCross, note that standard installation calls for only 6 screws, the rest are extras.
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Old 04-01-2009, 08:54 PM   #41
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Quote:
Originally Posted by wppii View Post
.
For RobertCross, note that standard installation calls for only 6 screws, the rest are extras.
FWIW...I would use as many you can, you can see how ours separated. The pdf says use 'em if 'ya wanna....I 'wanna.

Good Luck

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Old 04-05-2009, 10:58 PM   #42
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How the Lovin' Oven got fixed...

Finally, got it done.

Cleaned off the old sealant, trimmed a new sewer vent cap base to fit around the refrigerator vent, extended the vent pipe with a trimmed down ABS pipe connector and a short piece of pipe, applied Sik Flex 221 to the base, and installed it with the old screws supplemented with weatherseal washers.

No rubber gasket required!

Except for the jury-rigged extension of the pipe, this is how the vent cap should be installed.
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