Board behind manifold

[Mr Blobby]

When installing hot and cold manifolds, is it good practice to install a board on the blockwork first, and if so what?

Pipes are mlcp into plant room.

[Nickfromwales]

Walls first for any plant areas afaic. 
 

Doing this atm for the MVHR plant room:

 

 

 

 

 

Rear wall was caulked with intumescent caulk and painted before fitting the units, all A1 fire rated, and the rest is getting caulked and painted ad I go.

 

On this job I had to install the full wet plumbing early so the ASHP & UVC could go in early, so I painted a panel of PB and drilled it, then mounted it and then boarded the rest of the room. Painted it because of OCD and the fact it’s near impossible to paint around these things after the fact.

 

I plastered it the week after and then the full install of the UVC etc went ahead.