3. What is the U-Value required as from the 1/4/02 to
meet the requirements of Part L when insulation is laid between
joists?
The U-Value required would be 0.16W/m2K. This can
be achieved by laying 100mm of Earthwool Loft Roll between
48mm x 100mm joists at 600mm centres then cross laying with 170mm
Earthwool Loft Roll .