Pocster Posted April 12, 2017 Share Posted April 12, 2017 (edited) Hey all, My first floor has beam and block we intend wet UFH. Should I bother and insulate underneath it first?. Heat loss would heat the beam & block which is good yes? So can I lay the UFH straight on B&B ; membrane then screed?. Another issue I have is that insulating the floor would obviously effectively lower my ceiling. This hasn't been spec'd ; so I am adding as I go. If I did insulate what thickness?; low maybe 50mm??? thanks as always! Edited April 12, 2017 by pocster Link to comment Share on other sites More sharing options...
PeterW Posted April 12, 2017 Share Posted April 12, 2017 You need Insulation as you have a cold bridge into the beams and they will take a lot of heating ..!! What is the space below the beam and block ..?? Link to comment Share on other sites More sharing options...
Pocster Posted April 12, 2017 Author Share Posted April 12, 2017 18 minutes ago, PeterW said: You need Insulation as you have a cold bridge into the beams and they will take a lot of heating ..!! What is the space below the beam and block ..?? Ah ok :-) Below is the underground room! (which will have UFH also). So 50mm on beam and block good enough?. I guess screed is 50mm ish.; so I'm gaining quite a bit of height..... Link to comment Share on other sites More sharing options...
PeterW Posted April 12, 2017 Share Posted April 12, 2017 What are your current ceiling heights ..?? Difference between 2400 and 2300 is negligible - some modern 3 storeh developer boxes have 2235 ceilings and you can't tell. Link to comment Share on other sites More sharing options...
Pocster Posted April 12, 2017 Author Share Posted April 12, 2017 Ceiling heights are around that. Link to comment Share on other sites More sharing options...
Onoff Posted April 12, 2017 Share Posted April 12, 2017 17 minutes ago, pocster said: Below is the underground room! Looking at your avatar are we talking dungeon? 1 Link to comment Share on other sites More sharing options...
Pocster Posted April 12, 2017 Author Share Posted April 12, 2017 7 minutes ago, Onoff said: Looking at your avatar are we talking dungeon? Down there at the moment; it's dark, damp, wet and very frightening! ; so yes! just like a dungeon!!! Link to comment Share on other sites More sharing options...
CC45 Posted April 12, 2017 Share Posted April 12, 2017 Id put more than 50mm of insulation under the pipes. Weve got 225mm under ours. 2.5m height in rooms. All sorted before we started to build anything. Link to comment Share on other sites More sharing options...
ragg987 Posted April 13, 2017 Share Posted April 13, 2017 Our basement ceiling is beam and block. There is no cold bridging, beams are inside the insulated envelope. We have 50mm of insulation below the screed and ufh pipes on ground floor. I discussed the need of this insulation with my architect as i did not see it being essential, but he disagreed on the basis that we would be heating basement via the ceiling. In any case, the beam and block contributes to the heated mass and will help stabilise the room temperature. Link to comment Share on other sites More sharing options...
Pocster Posted April 13, 2017 Author Share Posted April 13, 2017 10 hours ago, CC45 said: Id put more than 50mm of insulation under the pipes. Weve got 225mm under ours. 2.5m height in rooms. All sorted before we started to build anything. Wow!; that's a chunky floor! Link to comment Share on other sites More sharing options...
Pocster Posted April 13, 2017 Author Share Posted April 13, 2017 (edited) 8 hours ago, ragg987 said: Our basement ceiling is beam and block. There is no cold bridging, beams are inside the insulated envelope. We have 50mm of insulation below the screed and ufh pipes on ground floor. I discussed the need of this insulation with my architect as i did not see it being essential, but he disagreed on the basis that we would be heating basement via the ceiling. In any case, the beam and block contributes to the heated mass and will help stabilise the room temperature. BCO is out today ;I'll see what he thinks - usually he is somewhat dis-interested! Edited April 13, 2017 by pocster Link to comment Share on other sites More sharing options...
CC45 Posted April 13, 2017 Share Posted April 13, 2017 Basement ceiling - you wont need as much as our floors but if you are running both rooms at different temps then you will need some. How are you dealing with heat losses on the perimeter? Link to comment Share on other sites More sharing options...
Pocster Posted April 13, 2017 Author Share Posted April 13, 2017 46 minutes ago, CC45 said: Basement ceiling - you wont need as much as our floors but if you are running both rooms at different temps then you will need some. How are you dealing with heat losses on the perimeter? Bco thought 50mm insulation was fine . perimeter ? What do you mean exactly ? The insulation upstand ? Cheers Link to comment Share on other sites More sharing options...
ragg987 Posted April 13, 2017 Share Posted April 13, 2017 The basement wall is icf, the beam sits on the concrete centre and the perimeter is clad with the external icf insulation plus a secondary layer of eps. Link to comment Share on other sites More sharing options...
ragg987 Posted April 13, 2017 Share Posted April 13, 2017 3 minutes ago, pocster said: Bco thought 50mm insulation was fine . perimeter ? What do you mean exactly ? The insulation upstand ? Cheers Cross posted. I mean external boundary of the walls, yes it is an insulation upstand. I think it is 300mm thick. Link to comment Share on other sites More sharing options...
CC45 Posted April 13, 2017 Share Posted April 13, 2017 So heat loss is reduced as much as poss. Good stuff 1 Link to comment Share on other sites More sharing options...
Recommended Posts
Create an account or sign in to comment
You need to be a member in order to leave a comment
Create an account
Sign up for a new account in our community. It's easy!
Register a new accountSign in
Already have an account? Sign in here.
Sign In Now