Advice on insulated plasterboard around pipes

[adam861]

I'm currently refurbishing a room and in the process adding some internal wall insulation.

The wall has been stripped and my plumber is coming this week to install/reconfigure the pipework for new radiators.

The walls are solid brick and as I am installing insulated plasterboards, we agreed rather than chasing the pipework into the wall, he will run the 15mm pipework clipped to the surface of the wall as this will then be hidden by the plasterboards. (I will be insulating with Celotex 52.5mm insulated plasterboards).

However I am now thinking, how exactly will the plasterboards hide the pipework?

1. Would I cut into the insulated plasterboard to accommodate the pipework? I believe this isn't recommended as it could breach the insulation properties of the boards
2. My plasterer planned to use dot and dab so would he need to apply additional adhesive to make up the difference?
3. Would the plasterboards need to be mechanically fixed to batons instead of dot and dab?
4. None of the above and just get the plumber to chase the pipework into the wall?

Any advice would be much appreciated.

 

[king of pipes]

Best to batten the wall in my opinion.

 

[exedon2]

As above or do what's done on new build to accomodate 22mm pipes .
Get plasterer to dot extra strips of plasterboard to wall to pack insulated boards off.
I've had the older part of my place done with that type of board we added a fair few mechanical fixings as well.

 

[adam861]

Thanks both. So if I go down the baton route and then I assume fix the insulation to the batons, what would I do about the gaps behind the batons to avoid damp issues?

Or maybe just use wool insulation in-between the timbers instead of insulated plasterboard?

 

[king of pipes]

Insulate between the battens there will be thinner insulation over the pipes

 

[Timmy D]

If it’s just one room and pipework for rads, just get the angle grinder and sds outand chase the pipes in 30 mins.

Sounds like a lots less hassle than battens etc.

 

[adam861]

If it’s just one room and pipework for rads, just get the angle grinder and sds outand chase the pipes in 30 mins.

Sounds like a lots less hassle than battens etc.

Thanks for your comment.

Either way it's more work for my plumber or more work for my plasterer, just trying to work out which would be more cost effective. I've asked my plumber how much extra he would charge to chase them in.

Out of interest, how deep would he need to chase and what sort of protection (if any) would he need to protect the pipes?

 

[Timmy D]

Thanks for your comment.

Either way it's more work for my plumber or more work for my plasterer, just trying to work out which would be more cost effective. I've asked my plumber how much extra he would charge to chase them in.

Out of interest, how deep would he need to chase and what sort of protection (if any) would he need to protect the pipes?

You’re insulating over the top, so deep enough to get the pipes below the current wall level with enough to strap them in (galv band) and to protect them (hair felt will do) from any dot/dap.

Did you say 50mm insulated plasterboard? Could even cut some insulation out of the back.

 

[ShaunCorbs]

Any reason why they can’t put in front of the plasterboard you would need the chase 35mm deep

 

[adam861]

Any reason why they can’t put in front of the plasterboard you would need the chase 35mm deep

But then the pipes would be on display and I don't think the wife would let me live in peace if that happened!

How did you get to 35mm deep out of interest? Is this just to accommodate 15mm and pipe clips?

By the way they don't need to be completely hidden beneath the wall, they can protrude out slightly as there will still be some extra mm allowance for the dot and dab.

 

[adam861]

Did you say 50mm insulated plasterboard? Could even cut some insulation out of the back.

I will be using 52.5 celotex which is basically 40mm insulation bonded to 12.5mm plasterboard. Cutting into this is an option (my first option actually in my original post) however i've heard this is to be avoided as it could breach the insulation.

 

[ShaunCorbs]

But then the pipes would be on display and I don't think the wife would let me live in peace if that happened!

How did you get to 35mm deep out of interest? Is this just to accommodate 15mm and pipe clips?

By the way they don't need to be completely hidden beneath the wall, they can protrude out slightly as there will still be some extra mm allowance for the dot and dab.

9mm insulation and 15mm pipe

Are they chased in existing ?

 

[adam861]

9mm insulation and 15mm pipe

Are they chased in existing ?

ah ok. Yes they are chasing in at the moment but be swapping one to a smaller size and changing the location of the other rad, so it is this new pipework that i'd like to be hidden