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?
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.
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.