UFH heating- 3 adjacent area

[ab12]

I need to get UFH done in 3 adjacent areas, ground floor, solid slab construction.

 

Area 3 is Kitchen, new built extension, Area's 2 and 1 are are existing old structures with solid ground floors.

 

Plan is for UFH for all 3 areas but in 2 satges. Manifold to be kept in Area 2.

 

UFH to have 2 zones, Zone 1 =Area 3 and Zones 2= Area 2+1

 

Now due to logistics etc  is it theoretically possible to get UFH done for Area 3 first, so have the flow and return pipes from Manifold located in area 2 , pipes pressure tested etc. and screeded

 

Then few months later get Area 2 and 3 done.

 

Property will get boiler installed at a later date, currently no boiler in the property.

 

Basically is it possible for me to get Area 3 pipes installed, pressure tested and screeded and then do Area 2+ 1 simultaneoulsy at a later date?

 

Thanks

 

[Nickfromwales]

1 hour ago, ab12 said:

Area 3 is Kitchen, new built extension, Area's 2 and 1 are are existing old structures with solid ground floors.

Is there any known insulation under the existing floors, and what’s proposed for the extension floor?

 

You’ll likely need to put pipe in at 100mm cc on the existing areas, and maybe 150-200mm cc for the extension, to balance out the difference in performance.

 

Running the pipes in to Z2 is easy, just needs some sleeving over them where they exit the room, but why not have the manifold in the back of a kitchen unit? 

[ab12]

1 hour ago, Nickfromwales said:

Is there any known insulation under the existing floors, and what’s proposed for the extension floor?

 

You’ll likely need to put pipe in at 100mm cc on the existing areas, and maybe 150-200mm cc for the extension, to balance out the difference in performance.

 

Running the pipes in to Z2 is easy, just needs some sleeving over them where they exit the room, but why not have the manifold in the back of a kitchen unit? 

Sorry I should have elaborated Area 1 and 2 is solid construction, I plan to dig about 275mm of ground out, install Recycled Foam Glass which will be compacted to a depth of 200mm and this will be wrapped in geotextile membrane and finished with 75mm screed.

 

The reason for partly not having the manifold in Area 3 - the kitchen- is once Area 3 is screeded I will need to run the pipes needed for Areas 1 and 2 and leave then exposed in either Area 1 or 2 and they'll get in the way whilst the ground is being dug.

 

I take it I can install UFH first in the kitchen Area 3 and then Areas 1 and 2 later OR does it all have to be done at once if both zones are connected to the same manifold.

 

Thanks

[Nickfromwales]

1 hour ago, ab12 said:

I plan to dig about 275mm of ground out, install Recycled Foam Glass which will be compacted to a depth of 200mm and this will be wrapped in geotextile membrane and finished with 75mm screed.

Expensive and laborious option? What’s the rationale for using foamglass?

 

You can ‘plumb as you go’ and even have just one loop filled and working, as the manifold will allow you to shut off the ports for the future loops. 

[ab12]

7 minutes ago, Nickfromwales said:

Expensive and laborious option? What’s the rationale for using foamglass?

 

You can ‘plumb as you go’ and even have just one loop filled and working, as the manifold will allow you to shut off the ports for the future loops. 

Would love to avoid RFG but its a an old victorian house with solid walls so have been advised to use this over PIR...RFG manages the moisture, doesn't push it to the wall as opposes to PIR with DPM - mositure will either condens under DPM or will be pushed to the alls and cause potential risng damp?

Thats my limited understand.