can one use foam filler around central heating pipes close to the boiler

[Question]

I am thinking of using foam to fill gaps around copper pipes in the ceiling and wall.  The copper pipes are the main ones from the boiler.

 

Can the foam take the heat?  I am thinking of getting:  Soudal Genius Gun Gap Filling Expanding Foam 500ml | Toolstation

 

Your advice appreciated. 

[SteamyTea]

My experience with polyurethane foams and high temperatures is that over time the foam breaks down.

[Question]

2 hours ago, SteamyTea said:

My experience with polyurethane foams and high temperatures is that over time the foam breaks down.

Thanks.  Should I cover the pipes first and then foam around them  ?

[Nickfromwales]

Exp foam sometimes makes the pipes creak. For heating pipes, I'd recommend spraying or brushing on something like a silicone lubricant onto the copper pipes first, as a release agent, and them foaming eg so the foam doesn't 'grip' the pipe(s). Likewise with the hot pipe, basically anything which expands / contracts / has a bit of movement.

A chap I knew decided to retro fit exp foam to all of his uninsulated heating pipes throughout the entire first floor, and had to take it all back out a few months later due to how bad this clicking / creaking noise had become.

Not so much of a problem if the foam plug is only a few inches long / deep.

[SteamyTea]

15 minutes ago, Question said:

Thanks.  Should I cover the pipes first and then foam around them  ?

Well as it is the PU breaking down/softening you may be better off just putting a bit of woolen blanket or rubber around them. 5mm of that, then foam.

Try one and see how you get on.