Solution for seal around cast iron pipe?

Christyt

D11 Keston
Hi all,

I have a conservatory tacked on DIY style onto back of the house.

There's a Cast iron down pipe running along back wall through conservatory but it hasn't been sealed properly when built and is now in a terrible state and letting in water.

http://www.flickr.com/photos/31267686@N03/6481217877/in/set-72157628343830381

A roofer who leaded along the back wall said he couldn't do anything better to seal the pipe.

See pic:
http://www.flickr.com/photos/31267686@N03/6481217877/in/set-72157628343830381

While I appreciate it's never going to be a proper solution, there must be some materials that can be stuck, jubilee clipped and glued around the pipe and across to the back wall to at least resist the rainwater surely?

I'd be grateful if anyone could suggest what they would do because currently it's full of holes and useless!

Thanks!

ormus

http://www.flueandchimney.co.uk/flueandchimney/ProductSubCats.asp?CatID=13&SubCatID=35&SubCat=Seldek

you need summat similar to this flexible lead slate flashing.

or this one.

http://www.midlandlead.co.uk/products/ancillary.html

Christyt

Cheers Ormus - but those need to be slid over the top of the pipe don't they? There's no way of sliding anything over this pipe. It feeds through 3 or 4m through the guttering along top of the house. I need something I can patch on around it. Unless you think these could be cut and fit around the pipe and then sealed afterwards?

ormus

some of em can be cut and rejoined.
the rubber ones can be glued and the lead ones can be leaded.

Christyt

Thanks a million - I'll look into those.

GlynD

I've looked at a few of your pictures and the join at the roof looked better before the works were done. I think you need to get a clever builder or roofer in who will either strip the joint back to the basics and make it a good seal or make a regular shaped galvanised box which will fit over the whole thing and can easily be sealed where it joins at the wall and roof.

Christyt

The roofer said he puts in a special pvc 'bead under between the lead and the cement because the cement won't bond to the lead and will disintegrate.

See this pic - http://www.flickr.com/photos/31267686@N03/6481217529/in/photostream/

I've never seen anything like it on any other leading work and can't see how the cement will bond any better to the PVC? Looks like a bizarre pointless extra which if anything else is opening up more weakness in the seal. But maybe I'm missing something.

Seems to be that cutting and re-sealing one of these rubber/lead circular flashing things could be the best solution. Would have to be trimmed pretty narrow round the back to fit in the small gap but could maybe be tucked under some cement. Better than what's there now I think?

ormus

looks like it was done by a trained monkey.

Christyt

You should have heard him shouting at me at how high quality work I was getting! And at a bargain price. "I've had four guys round for two days and I normally charge £200 a day..." blah blah. I said why did you quote me so 'cheap' then and he said he felt the job was worth his while. He just kept talking and contradicting himself. I've had several quotes and he's no bargain. If you'd seen how they cut the insulation. Thing is, noone will give them bad feedback on checkatrade - it's immaculate. I can't believe I'm the only one. He's got a bully boy vibe about him so I can see why people think twice about leaving bad feedback, and as the work is on roofs, mostly people probably don't even know. I wouldn't be surprised if he'd come round and smash my windows or something.

GlynD

It's hard to make a valid opinion because I'm not a roofer and don't know all the ins and outs. I can only give you MY opinion and I agree with Ormus in that it doesn't look like a very professional job. I think a lot more could have been achieved with a lot less material - if it were the right material. Does your council not have an inspector they could send out to review the works?

welda

I'd be tempted to chop a section out, this would allow you to slip over a flashing device, similar to link in Ormus post. I see you have 2"- ish waste going into same down pipe, you could buy this> http://www.rainclear.co.uk/index.asp?cat1=5&cat2=17&ps=4|1&ct=14&t=Cast+Iron+Drainage+for+Soil+Pipe+%26+Fittings

And internal, something like this> http://www.rainclear.co.uk/index.asp?cat1=4&cat2=15&ps=4|14&ct=16&t=Rolled+Steel+Gutters+for+Downpipe+%26+Fittings

Hope you get it sorted soon....

Regards.......

Hmmmm, link don't take direct path to image. 1st link: 1st & 4th items on right hand side column.

2nd link: another option for internal fitting. 3rd item down, right hand side.