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Anon
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Got a leak, How to seal a Coachbuilt Roof?


Hi all,

Be gentle this is my second post after introducing myself. Our 1979 V reg CF350 Pioneer motorhome has a leak that I have noticed in the rear down the side of our water heaters chimney. We have a kitchen at the rear with 2 eye level cupboards which the chimney goes through.

I have got a stepladder and looked up on top and couldn't see too much that was obvious. But I can tell that alot of whatever sealant was ontop is now easily peeling away around roofvents etc. It's had a kind of silver paint like hammerite over the top. Some of the metal/rubber sealing strips around the outside need to be pushed up tight and sealed properly again.

We have only just bought the van and thought before we do anything inside we need to make her watertight!

When I press on the panels on top they don't seem strong, as in not able to take my weight safely. How can we safely climb on the top to paint and seal safely? I would like to seal up every bit I can get to across the whole roof. No point doing something half hearted!

What do you recommend as a sealant for the panels on top/joints etc. Silicon? or Zycor and marine rubber sealant?

Also after using a sealant I would like to put a fresh coat of some kind of paint/sealer on the top. Any suggestions of something that flexes and will help keep the roof fixed for longer?

Looking at the back of the eyeline cupboard I can see the plywood on the inside of the cupboard is crumbling (Due to this leak I can physically see running down the chimney. But I want to get all the sealants/paints etc ready before starting the job!

As mentioned earlier one of my big concerns is being to safely get up on top without going through the roof..

I have searched and looked about and read lots of rot horror stories. Would love to hear any thoughts/ suggestions of products etc.

Thanks

Andy

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Tue 05 Jun 2012 @ 15:12 Edit this messageQuote this messagePMQuote this message
Anon
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I have a mk1 cf 340 3.5ton 2.3 litre I got on top of mine by placing a youngmans board across the whole vehicle from one side to other if you do not have a youngmans you can use a ladder just lay it across the roof making sure it reaches both support edges then lay a scaffold plank on to ladder and bobs ya uncle marg is ya gran you have a home made youngmans.I done my side roof trims with clear silicone sealant and the top of roof witch you dont see and water lays on I done the seals with proper roofing sealant from wickes its like bitumen in a mastic tube .

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Tue 05 Jun 2012 @ 18:31 Edit this messageQuote this messagePMQuote this message
Anon
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Hi angrydad rikki from high wycome just finished sealing my coachbuilt roof with a paint on seam sealer bought from a firm in scotland can be done in the rain worksa treat

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Tue 05 Jun 2012 @ 20:08 Edit this messageQuote this messagePMQuote this message
Anon
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Roof leaks.

Hi angtydad,

Done mine with licqid bitumen from Wicks worked first time,just off a ladder with a long handled brush.

Doug.

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Tue 05 Jun 2012 @ 20:12 Edit this messageQuote this messagePMQuote this message
Anon
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Captain Tolleys Creeping Crack Cure will solve capillary leaks which can't be solved or accessed with Sikaflex. Plumbers putty also remains flexible, but silicone sealant tends not to cope long term with the abuse it will get on a motorhome. Another useful product is Shoe Goo, which is a permanent part of my toolkit for puncture repairs, fixing hoses and making seals or grommets.


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Tue 05 Jun 2012 @ 21:50 Edit this messageQuote this messagePMQuote this message
Anon
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Thanks so much for your answers, I'm grateful as it has gave me some good ideas and I'm glad I'm not the only one having to crawl around on top of our old vans!

I will post up once I'm done with what I used & if theres anything I found useful.

Thankyou!

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Wed 06 Jun 2012 @ 15:41 Edit this messageQuote this messagePMQuote this message
Colin Birch
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I've had Dicht-Fix (see ebay) recommended to me in the past. If the video is anything to go by it should seal just about anything. An old scaffolding plank or two spread across the roof should spread the weight enough not to damage anything.

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Colin Birch - CF-UK Admin
Pontypridd, S.Wales
The Bedford CF Web Site
http://www.cf-uk.co.uk

Wed 06 Jun 2012 @ 17:40 View Colin Birch   Email Colin Birch   Colin Birch Home Page   Edit this messageQuote this messagePMQuote this message
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