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Thanks madrab. It's marked "1/2" on an elbow further back, picture added. I could just replace with malleable iron/steel fittings then?

Steel pipes to radiator valves (90 year old house) are very badly corroded. I want to replace the final section, joining to the old pipe which is in sound condition further back under the floor. What's the best way to do this?

Mine does same thing. Any more suggestions? Definitely not plaster or insulation dust!!

I cut strips of seating foam and spray glued it on and it has worked for the last 2 months, even in some torrential rain and high winds. It has stopped the leaking. I'm going to get the proper stuff (linked by Steve above) and replace it with that.

Some images...

I also have this problem. The foam had disintegrated allowing water (and debris, leaves, twigs etc) to get in under the tiles onto the membrane. I replaced the foam with strips of foam padding that i had, spray glued onto the channel. I'm going to wait for a few weeks to see if it works.