Best floor slab insulation?

[ashthekid]

I am just wondering what the best floor slab insulation is recommended for maximum heat insulation efficiency with UFH?

 
Current plan is for 100mm Kingspan to go in, we cannot go anymore than 100mm, if anything I would prefer to go lower if possible but then I know we won’t have the most efficient insulation for retaining heat. 

[PeterW]

Why are there 3 layers of insulation ..??

 

120mm PIR would be better - what’s the screed thickness ..??

 

Looks like there is the space to get 120mm in there and will work fine. 

[ashthekid]

Good question. 
I should have said that the only change to the layer detail is that only one layer of 100mm insulation is going on top of the concrete slab itself, then UFH, the screed which I believe is approx 25mm, then finished floor tile. No other insulation.

[Russell griffiths]

Are you in this country ?

or have you used an online architect service?

there is some weird stuff going on in your drawings, 

termite barriers WTF. 

[Thorfun]

14 hours ago, ashthekid said:

the screed which I believe is approx 25mm

are you sure? I thought about 50mm was the minimum for a liquid screed and 75mm for sand and cement

[ashthekid]

Yes in this country ? @Russell griffiths

 

So going back to the question of the 100mm insulation, what do you recommend as the best heat retention option?

Or does all PIR have the same level of retention?

Just trying my best to be efficient and make the UFH do its job properly.

[A_L]

15 minutes ago, ashthekid said:

Or does all PIR have the same level of retention?

 

Yes PIR is  consistent, thermal conductivity 0.022W/m.K (maybe 0.023W/m.K)

[Russell griffiths]

So why the termite barrier???

[wozza]

28 minutes ago, Russell griffiths said:

So why the termite barrier???

 

And why "to code" on the bolts and steel reinforcing ?

 

And is that an external wall without a foundation?

 

[ashthekid]

Thank you @A_L

That is what I wanted to know.
 

No termite barrier - European architect feature which is not happening. 

The external wall foundation detail is not needed as it is a wall that already exists. We are only building the new internal wall and slab. 

[dpmiller]

so what drawings are provided to the BCO?

[ashthekid]

A slightly different one that has been all signed off by BCO. ??

I just wanted to know about my 100mm insulation options.❓
 

 

[Olf]

You can also use phenolic boards (also with Kingspan in the name): 0.022W/mK , so you get 20% better insulation than PIR. But at >100% price premium (currently they're £90-£100 for 1.2m x 2.4m piece)

[ashthekid]

@Olf thank you 

 

I’ll look at them for sure.