P5PCFF1 Roof, Insulation At Rafter Level

Build Up

Party Masonry Cavity Wall

Separating Wall and Roof

2 x 100mm Aircrete Block (0.15W/m²K) Party (Separating) Wall

100mm cavity fully filled with insulation (0.044W/mK) density up to 40kg/m3

150mm insulation (λ = 0.044W/mK) between the rafters

50mm (λ =0.022W/mK) below the rafters