Hi,

I'm currently trying to insulate the pipework under my suspended floor. Where there are straight runs I am using the “normal” hollow tubes that split then wrap around, but most of the pipes are not straight (some seem to go in sweeping arcs for no reason at all). In a number of places they come together for a short distances before separating again and there is no room fit the normal insulation in-between them where they run alongside each other.

I suspect I'm using the wrong search terms because I can't see anything that is recommended for use in these cases. Is there a product suitable for wrapping around hot/cold pipes then taped?

The closest thing I have seen* is “felt pipe sleeving” but it looks like this is supposed to be slipped over the pipe while it is being fitted and if I managed to get it wrapped around the existing pipes I'm not sure how much insulation it would provide.

*http://www.wickes.co.uk/Wickes-Felt-Pipe-Sleeving-Pack-3/p/210456

Thanks for the ideas.
The split insulation I have doesn't seem to be flexible enough to curve whichever way round I try it, Maybe I should look for some other brand as I'm currently just using whatever was on offer at the local DIY shop.

One of the reasons I wanted to make sure the pipes were insulated is because I am insulating the floor above them. Without getting too much into the details the house is actually on a slope with the main living area at the higher level, under the floor is a garage at the front then it slopes up to a solid floor at the back. The pipes run below the joists so insulating around them would involve creating a "ceiling" and effectively bringing them into the "warm" part of the building, which seems like a much bigger job than insulating between the rafters (after reading much about this on here and elsewhere, I'm using mineral wool slabs between the joists with landscaping fabric underneath).

I suspect I will end up with option 3 of wrapping something around the pipes, because I'd be worried about the "serviceability" of the pipes if I covered them in the foam and found a leak or something needed changing at some time the future.

Thanks again

you'll probably end up snipping triangular bits out of the insulation to make it bend rather than kink up, and then wrapping the lot or at least the corners in duct tape or cable ties to hold it in place

not sure what the life expectancy of duct tape is, but it's probably "long enough". cable ties is basically forever!