23 October 2024 Kingspan GreenGuard GG300 achieves lower lambda Posted on 23rd October 202423rd October 2024 by Max Banner Kingspan Insulation is pleased to announce that Kingspan GreenGuard GG300 boards now achieve a lower declared lambda value (thermal conductivity) of 0.033 W/mK (0.035 W/mK design thermal conductivity for inverted roof applications).