The frame on a Dan-Wood house is 180mm thick and filled with highly insulating material. Additional insulation which is 120mm thick is added on the external walls enabling heat to be effectively retained in your house. (If you like the technical stuff, this is equal to a heat transfer coefficient of U=0.118 W/m² K).
Internal walls have enhanced sound-proofing, and also offer additional thermal control between rooms.
The roof can be covered with either concrete tiles, clay pantiles or slates. Again, the roof sections are superbly insulated with 220mm mineral wool.