We are installing a Wunda spreader plate with 50mm of celotex below. I need some guidance on switching from 22mm chipboard to structural cement boards.
Wunda have cautioned me about the carpet flooring that is now at 2.42 tog when combined with underlay. I'm using Tradaire King, at 0.8 tog, which seemed to be the lower tog I could find for carpets - lower ones were for wood/laminate floorings.
I cannot change the carpet, and we don't want to switch systems and lose head height, so I need to try and ensure this spreader system works with 2.42 tog of carpet. There are two new loft rooms (L shaped loft) (6mx4m and 4mx3m). Each with 100mm celotex in walls and roof (cold roof).
To give this the best chance of working, does it seem prudent to invest in structural cement boards, i'm trying to understand if the Knauf Gigafloor is actually twice as good as the other two. I've copied in pastes from their data sheets. The knauf is 25mm vs the others 22mm. Also I'm seeing a different use of units, STS has R for m2k/w while other have R for m2/kw, which makes it hard for me to compare.
I see the 22mm P5 chipboard has k value of 0.14, which doesn't seem that far behind the STS 22mm. So I'm also trying to understand the relative performance between the different systems and chipboard.
Knauf GifaFloor:
STS:
HardieFloor:
I've seen the gifafloor specced over at nu-heat too http://files.nu-heat.co.uk/core/media/media.nl?id=300642&c=472052&h=672c89d1105850def2d3&_xt=.pdf
GifaFloor is more expensive, so I want to be sure it's worth it, compared to the other two.
Wunda have cautioned me about the carpet flooring that is now at 2.42 tog when combined with underlay. I'm using Tradaire King, at 0.8 tog, which seemed to be the lower tog I could find for carpets - lower ones were for wood/laminate floorings.
I cannot change the carpet, and we don't want to switch systems and lose head height, so I need to try and ensure this spreader system works with 2.42 tog of carpet. There are two new loft rooms (L shaped loft) (6mx4m and 4mx3m). Each with 100mm celotex in walls and roof (cold roof).
To give this the best chance of working, does it seem prudent to invest in structural cement boards, i'm trying to understand if the Knauf Gigafloor is actually twice as good as the other two. I've copied in pastes from their data sheets. The knauf is 25mm vs the others 22mm. Also I'm seeing a different use of units, STS has R for m2k/w while other have R for m2/kw, which makes it hard for me to compare.
I see the 22mm P5 chipboard has k value of 0.14, which doesn't seem that far behind the STS 22mm. So I'm also trying to understand the relative performance between the different systems and chipboard.
Knauf GifaFloor:
STS:
HardieFloor:
I've seen the gifafloor specced over at nu-heat too http://files.nu-heat.co.uk/core/media/media.nl?id=300642&c=472052&h=672c89d1105850def2d3&_xt=.pdf
GifaFloor is more expensive, so I want to be sure it's worth it, compared to the other two.