Scottish u-value for concrete walls?

[ipoppy]

Hi,
Just to clarify what is the u-value requirement for concrete block wall 200mm (loft conversion) in Scotland. Insulation will be placed in timber frame with gap of 25 mm. I am getting different messages here because local Council telling me that U-value in my case should be 0.2 where Scottish regulations apparently says 0.27 which make huge difference in terms of insulation thickness which convert into money.
Thanks in advance.

 

[hotrod]

Hi ipoppy, I'm in England and the BRegs for England and Wales are different to Scotland so was unsure about your situation. However, an extract from the celotex website reveals:-

Target U values for domestic buildings in England and Wales are 0.2 W/m2K in roofs insulated at rafter level, 0.16 W/m2 in roofs insulated at horizontal ceiling level, 0.3 W/m2K in walls and 0.22 W/m2K in floors.

In Scotland there is a two tier system according to the efficiency of the boiler.

For oil boilers with a minimum SEDBUK rating of 85%, natural gas boilers with a rating of 78% and LPG boilers with a rating of 80% the requirements are as above with the exception of flat roofs and floors where the requirement is 0.25 W/m2K.

For boilers below those ratings, the requirements are 0.18 W/m2K in roofs insulated at rafter level, 0.16 W/m2K in roofs insulated at horizontal ceiling level, 0.27 W/m2K in walls and 0.22 W/m2K in flat roofs and floors.
SEDBUK is the Seasonal Efficiency of Domestic Boilers in the UK.

For special requests, contact the Celotex Technical Centre.

hth