[pavlik]

Ok - minor problem here. On our kitchen flat-roof (traditional bitumen/felt roof covering, with sealant) we have a small leak. The exhaust flue from our kitchen water heater exits through the flat roof. At the point that the tube joins the flat roof, it looks as if the sealant is compromised, as we have water dripping down the flue, and into the kitchen water geyser (heater).

What I need to do I gues is to reseal the point where the flue joins the roof.

Anyone know exactly what product I need to use and how to do this? I really don't want to have to get someone in for this if I can help it. Ultimately the whole flat-roof needs recovering, - but this is an emergency repair that needs to be done to stop water from dripping into my kitchen [surrender]

Cheers.

[NanoKakadze]

http://www.nwepaints.co.uk/acatalog/...nCoatings.html

This might be what you are looking for. Sadly the only roofs I know how to fix are shingled ones like I have in the US. Hope it helps a little bit.

[jincomplet]

Go to your local Doe Het Zelf store and ask them , they will give you the correct solution
http://www.karwei.nl/index.jsp?page=...ssen&rubr=2439

[BlackBird]

An exterior sealant like used on uPVC windows should do the trick.

[pavlik]

Looks like I'm off down the Gamma tomorrow then.

What I don't understand is HOW the water is getting through to the geyser itself though. The outer pipe actually has an inner metal exhaust pipe inside it. If the water was getting in at the point the outer pipe joins the roof, then I would expect the water to come down the outside of the inner pipe, and therefore not into the flue of the geyser - but it is

[lopezsokero]

bitumenband or even coldbitumen (its in a can, and is kinda like appelstroop) would probebly fix it if its not comming from somewhere else.

Maybe its the cap on the exaust pipe that is leaking?

[pavlik]

Maybe its the cap on the exaust pipe that is leaking?

Thats what I thought - but I've had a good look and its does not seem to be the case (the inside of the cap and immediate top of the inner tube looks dry)..

Plus, its not been raining here for an hour now (but there is still some standing water on the roof around the pipe) - and its still dripping inside - so I guess that rules out the cap as the problem.

I think the inner pipe might have a join at some point (as its a corrugated pipe at the bottom where it joins the geyser, but a rigid pipe at the top where it exits the outer pipe) so I think the water is entering where the outer pipe joins the roof, then running into the inner pipe at the join.

I think.... Besides, - if I reseal where the outer pipe joins the roof, and then it still drips, I know its not that! [rofl]

[lopezsokero]

I think.... Besides, - if I reseal where the outer pipe joins the roof, and then it still drips, I know its not that! [rofl]

[thumbup] Sounds like a plan...