Products > Therma > Therma TT46 LPC/FM > Overview Therma TT46 LPC/FM Tapered insulation for flat roofs waterproofed with mechanically fixed single-ply waterproofing Kingspan Therma TT46 LPC/FM Properties Download PDF Thermal conductivity 0.022 W/m.K Compressive strength at 10% compression 150 kPa Facings Composite foil Core High performance rigid thermoset polyisocyanurate (PIR) insulant manufactured with a blowing agent that has zero Ozone Depletion Potential (ODP) and low Global Warming Potential (GWP). Board size 1.2 x 1.2 m Manufactured rate of fall 1:60; 1:80