40mm condensate pipe

[Fallout]

If running 40mm pipe for a boiler condensate from internal to external with lagging. Is it advisable to lag through the wall cavity? Or will it effect the cement seal.

 

[Madrab]

I wouldn't, unless the hole's a bit on the larger side ....

 

[muggles]

Yes, HHIC guidance is to insulate through the wall, with a minimum internal pipe diameter of 30mm.

 

[ScottishGasMan]

If running 40mm pipe for a boiler condensate from internal to external with lagging. Is it advisable to lag through the wall cavity? Or will it effect the cement seal.

Yes the preference is to lag through the wall. But very rarely ever see it done. If you didn't then you'd need to make sure the lagging is sealed to the wall with the likes of silicone

 

[Madrab]

Never seen it referenced for a 40mm (46mm) waste pipe, for a 32mm pipe yes but not a 40mm.

 

[ScottishGasMan]

Never seen it referenced for a 40mm (46mm) waste pipe, for a 32mm pipe yes but not a 40mm.

The referance is always "a minimum of 32mm AND insulated" So the gas safe inspectors tend to take that as 32mm or bigger and insulated, as opposed to insulated 32mm, but not on larger pipes.

 

[Madrab]

 

[Fallout]

Yes the preference is to lag through the wall. But very rarely ever see it done. If you didn't then you'd need to make sure the lagging is sealed to the wall with the likes of silicone

Cement would eat in to the lagging/not seal due to movement in the lagging?

 

[Fallout]

Or can cement be used?