Sequence of work - Help!

[JulianB]

Evening All,

 

I've finally received all my central heating components (ASHP, Buffer tank, UFH pipework, Manifolds, UVC etc etc) and am wondering how best to tackle the next phase...

 

I'm planning to install the UVC, buffer tank & UFH manifold for that level under the staircase (which isn't there yet), and depending on how snug I can get it all to fit whilst still being accessible, will then dictate where my stud partition wall to my bathroom will end up (I will be gluing down the sole plates so hopefully this should not impact UFH layout too much). My dilemma comes as follows:

• The floor still needs to be screeded and UFH pipes laid - precise positioning of UFH manifold will be established once I can get UVC etc in place for a dry run on packaging overhead
• The stairs can then go in once the floor is screeded, or alternative installed before hand and packed to the FFL height and then unpacked and suspended for the day of screeding (unless the moisture is likely to damage it?)
• I've read some posts where gentle UFH some time after screeding will greatly help with drying times (implying heating is up and running by the screeding stage)
• I could mount buffer tank and all central heating pipework to the wall under the staircase to avoid them having any impact on screeding, however the wall in question is still currently bare blockwork
• I could wet plaster or D&D the wall prior to fitting buffer tank and corresponding pipework, however must ensure plaster ends approx. 20mm above FFL?

 

Based on the above thought process...would it be wisest to -> wet plaster (or possible D&D) wall -> install buffer tank / pipework, plumb in central heating (minus UVC) -> lay insulation, UFH & screed -> install staircase -> install UVC and fire system up (bearing in mind G3 checks etc)?

 

Whilst also on the subject of plumbing and screeding... to complicate matters, I will have 2 bathrooms on this ground floor level (upside down house), and am wondering whether there would be any harm in shuttering the shower tray areas prior to screeding to provide greater flexibility on waste pipe layout / tray height. If I later opt for a raised tray, I could simply fill in these areas or would this be frowned upon due to breaking the continuous layer and creating a flush joint?