fan leak repair

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   My max air fan started leaking last month so I climbed up and found the dicor had split 3/4  of the way around.Did a quick silicon fill and finally last week went up and took a hard look at it.
stripped off the Dicor and pulled the fan and found a few problems.
1. the fan was mounted off center of the hole they cut and the screws missed the aluminum ceiling framing on one side completely
2. The mastic tape was put up tight against the inside edge of the fan flange missing the mounting screw holes completely on three sides.
3. The screws are self taping drill type, and a bit to short, most hit the aluminum and some did not penetrate the aluminum, lifting the plywood and making the roof wavy. and very random screw pattern.
4. Someone noticed a leak before i took possession (brand new, but did sit around somewhere for 1 1/2 years before I received it), And they added screws way out on one outside edge and hit it with a little Dicor. 
So I centered the fan, put butyl tape where it should go, used longer screws, and replaced the Dicor.
It's been raining to flood stage for the last week (VA) and all is good!
In the immortal words of Marwayne, If you want something done right.......

The leak

The mastic

Random screw patterns

The black line shows the outside edge of the flange.

All better!

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voisj Members Profile Send Private Message Find Members Posts Visit Members Homepage Add to Buddy List Senior Member Joined: 19 Jul 2016 Location: San Luis Obispo Online Status: Offline Posts: 471	Topic: fan leak repair Posted: 15 Aug 2020 at 3:21pm
	My max air fan started leaking last month so I climbed up and found the dicor had split 3/4 of the way around. Did a quick silicon fill and finally last week went up and took a hard look at it. stripped off the Dicor and pulled the fan and found a few problems. 1. the fan was mounted off center of the hole they cut and the screws missed the aluminum ceiling framing on one side completely 2. The mastic tape was put up tight against the inside edge of the fan flange missing the mounting screw holes completely on three sides. 3. The screws are self taping drill type, and a bit to short, most hit the aluminum and some did not penetrate the aluminum, lifting the plywood and making the roof wavy. and very random screw pattern. 4. Someone noticed a leak before i took possession (brand new, but did sit around somewhere for 1 1/2 years before I received it), And they added screws way out on one outside edge and hit it with a little Dicor. So I centered the fan, put butyl tape where it should go, used longer screws, and replaced the Dicor. It's been raining to flood stage for the last week (VA) and all is good! In the immortal words of Marwayne, If you want something done right....... The leak The mastic Random screw patterns The black line shows the outside edge of the flange. All better!
	SLOPODMODS John&Sue,SLO,CA 2016 180 HRE, 2013 F150 Eco Boost

mcarter Members Profile Send Private Message Find Members Posts Add to Buddy List podders Helping podders - pHp Joined: 07 Apr 2016 Location: Greenbrier, TN Online Status: Offline Posts: 3419	Posted: 15 Aug 2020 at 5:18pm
	I like what you did. I would have used eternabond on the exterior, sealed it to roof and moved away from Dicor.
	Mike Carter 2015 178 " I had the right to remain silent, I just didn't have the ability."

voisj Members Profile Send Private Message Find Members Posts Visit Members Homepage Add to Buddy List Senior Member Joined: 19 Jul 2016 Location: San Luis Obispo Online Status: Offline Posts: 471	Posted: 15 Aug 2020 at 5:26pm
	Thanks, I'm googling eturnabond now, haven't heard of that stuff.
	SLOPODMODS John&Sue,SLO,CA 2016 180 HRE, 2013 F150 Eco Boost

GlueGuy Members Profile Send Private Message Find Members Posts Add to Buddy List Senior Member Joined: 15 May 2017 Location: N. California Online Status: Offline Posts: 2629	Posted: 15 Aug 2020 at 6:11pm
	Oye! Based on my reading of people's experiences, I think he eternabond actually lasts longer.
	bp 2017 R-Pod 179 Hood River 2015 Ford F150 SuperCrew 4WD 3.5L Ecoboost

mcarter Members Profile Send Private Message Find Members Posts Add to Buddy List podders Helping podders - pHp Joined: 07 Apr 2016 Location: Greenbrier, TN Online Status: Offline Posts: 3419	Posted: 15 Aug 2020 at 6:22pm
	Eternabond applied correctly is really a good alternative to Dicor, especially for roof vents and spoilers. Lot of info on the product, for me it is a long lasting fix.
	Mike Carter 2015 178 " I had the right to remain silent, I just didn't have the ability."

marwayne Members Profile Send Private Message Find Members Posts Add to Buddy List Senior Member Joined: 25 Oct 2011 Location: Edmonton AB Can Online Status: Offline Posts: 1002	Posted: 15 Aug 2020 at 10:20pm
	This is how my vents look. I don't like Dicor , it's messy gets dirty and cracks. I use 2 strips 1/8" of closed cell foam spaced about 1/2" apart, then I put a bead Polly Urethane between the 2 strips of foam and another bead around the perimeter. Now I can put the vent in it's place, predrill the holes put a dap of caulk in each hole and screw it down. What ever squeezes out can be peeled off once it has set up. You be the judge, it's clean.
	If you want something done right, do it yourself. 2011 RP172, 2016 Tundra 5.7 Litre, Ltd.

StephenH Members Profile Send Private Message Find Members Posts Add to Buddy List podders Helping podders - pHp Joined: 29 Nov 2015 Location: Wake Forest, NC Online Status: Offline Posts: 6288	Posted: 16 Aug 2020 at 7:46am
	Marwayne, Is the sealant you used something like Lexel?Your installation looks clean. How well has it held up?
	StephenH Happy is the man that findeth wisdom,... ouR escaPOD mods Former RPod 179 Current Cherokee Grey Wolf 24 JS

marwayne Members Profile Send Private Message Find Members Posts Add to Buddy List Senior Member Joined: 25 Oct 2011 Location: Edmonton AB Can Online Status: Offline Posts: 1002	Posted: 16 Aug 2020 at 10:29am
	So far so good, I did this 6 years ago. this is the caulking I use
	If you want something done right, do it yourself. 2011 RP172, 2016 Tundra 5.7 Litre, Ltd.

StephenH Members Profile Send Private Message Find Members Posts Add to Buddy List podders Helping podders - pHp Joined: 29 Nov 2015 Location: Wake Forest, NC Online Status: Offline Posts: 6288	Posted: 16 Aug 2020 at 12:01pm
	Thanks. I'll have to look for it if I need to do something on the roof of our RPod.
	StephenH Happy is the man that findeth wisdom,... ouR escaPOD mods Former RPod 179 Current Cherokee Grey Wolf 24 JS

marwayne Members Profile Send Private Message Find Members Posts Add to Buddy List Senior Member Joined: 25 Oct 2011 Location: Edmonton AB Can Online Status: Offline Posts: 1002	Posted: 16 Aug 2020 at 1:28pm
	The nice part about this caulking you can put a strip of 1 mill poly over it and you work on the bead and don't get your hands all messed up, and after 2 or 3 days you can take the poly off
	If you want something done right, do it yourself. 2011 RP172, 2016 Tundra 5.7 Litre, Ltd.