thermalite block insulation

[smart51]

I must be reading this wrong.  Thermalite Turbo aircrete blocks have a quoted insulation value of 0.11 W/m.K according to the data sheet.  Part L for England (2022) calls for 0.16 for walls and 0.11 for floors.  At face value, it suggests that a single skin of blocks is enough.  What have I got wrong?  Is it per metre thickness of Thermalite block, rather than for 1 block thickness?

 

https://www.forterra.co.uk/wp-content/uploads/2021/02/Thermalite_A5_guide_2020.pdf

[PeterW]

Correct - it is per metre. 

[Russell griffiths]

And then it also depends on the mortar joints, they are nothing like as insulated as a block, so an as  built wall does not add up to the stated value of a block, lots more things to add into the equation. 

[JohnMo]

Completely different units.  But part of a u value calc.

 

W/m.k, that how much heat is lost per metre thickness of that material per degree.

 

U value is W/m2.k that is what building control looks at, it is the build up of all materials in say a wall in area

 

 

[tonyshouse]

Not just the blocks, the cavity, cavity insulation,plaster, outside skin 

 

I stopped using aircrete in the 1980s as it cracks too easily 

[smart51]

4 hours ago, tonyshouse said:

I stopped using aircrete in the 1980s as it cracks too easily 

In service or just during construction?

[tonyshouse]

Both especially irksome for new build snagging but the cracking is ongoing even from doors slamming thermal movements, jumping up and down some go unnoticed being behind  dry lining causing additional air infiltration 

[Jane W]

On 21/03/2022 at 17:51, tonyshouse said:

I stopped using aircrete in the 1980s as it cracks too easily 

Out of interest what are you using instead now, and how do they compare in terms of u values?