Help! Leak Between Two Flat Roof Panels

[MotorizedHouse]

Hi all, bit rude of me posting without introducing myself so forgive me.

I'm looking for some wisdom here if it could be spared. I've been battling a relatively small leak for a bit. This time it's won. I've tried Sikaflex 512 and Isoflex Rubber roof but both repairs seem to give way in due time.

You see, there is a gutter or gap where two aluminium roof sheets join. I have tried filling them with the named products above but the repair doesn't seem to last long. Both times I properly prepared the surface (white/purp spirits)

No joy. I think part of the reason for this is that gutter is to allow some flex and movement so anything I put in there would be subject to intense movement from the two roof panels. What can I do? Mind you I'm considering to have this professionally resolved and there's a place down the road from me that specializes in american style RV bus thingies, maybe they could help.

Here's a picture I put together in a jiffy.

http://i.imgur.com/FulGpCG.png

 

[B-well]

found this article. ukcampsite.co.uk i would recommend W4 roll mastic for rails , have a look here http://www.wizard41.pwp.blueyonder.co.uk/caravan-resealing.htm , Sikaflex can also be used , i used it on my rails just to be extra fussy and get a nice finish . I did use it on lots of other fittings where roll mastic would have been difficult to use .
NEVER use silicone sealant for resealing caravans .
When removing rails take extra care as they can be very easily bent , you must remove all screws first , don't try to pull out a screw with the rail , if the screw head is chewed up use a dremel cutting tool and cut a slit across the end of the screw , then undo with a flat blade screwdriver . Sikaflex may be difficult to remove if you want to remove the rails at a later date and reseal them properly .

I hope this info helps

 

[MotorizedHouse]

Hey thanks for taking the time.

Its actually not a rail of any sort, its literally just a point where the two roof sheets meet. I'm sure when they joined the two up they bunged some sort of non drying mastic inside where I can't get to without taking the whole roof apart. Well 25 years later...oops. No warranty on this!

 

[trekkin]

Hi welcome

Having tried a few times I would consider calling Motorhome Medics (is this who you mean) for advice support.

There are also other very good RV repairers that are able to assist, although I am sure there are motorhome repairers that can advise

 

[Sundowners]

IF it were mine---------I would get some DICOR and put a strip of ally at least 4" wide and 1mm thick across the split, if it looks like there is timber underneath I would screw with SS screws , AND cover all screws with more dicor ---available at RV spares places like Star Spangled Spanner.--------I suspect that there is some movement between the two panels which is causing the split-----Sikaflex SHOULD have stopped it leaking.
Nigel

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