Dunster House Ltd.
Incorporated. 1994
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All about wall thickness

If you intend to use your log cabin all-year-round - rather than seasonally - you should choose as thick as wall as possible, to maximise the insulation. U-Values provide a measure of the heat transfer through different materials, to allow you to compare options.

We use interlocking tongue & groove timber in our walls to provide strength and stability, it also allows timber to naturally expand and contract.



Our 19mm walls are ideal for the smaller building used for seasonal use. (U-Value 3.16 W/m² K)







 Our 28mm walls are 50% bigger than a 19mm wall and are ideal for medium sized buildings for seasonal use (U-Value 2.59 W/m² K)





 Our 45mm walls contain over 60% more wood than a 28mm wall and are ideal for use all-year round. (U-Value 1.93 W/m² K) 




 Our 130mm walls are a cabin-within-a-cabin. The two walls float independently - unlike some competitors - this ensures that as the outer wall expands and contracts in more extreme weather, it doesn’t pull the inner wall out of place. The walls have a 70mm air cavity in-between to provide even more insulation. This air cavity allows you to insulate your walls with a material of your choice, so if your budget does not reach for a TripleTherm cabin or if you feel you have a better insulation option available ​to you. We recommend these for home offices and cabins being used all-year-round. (U-Value 1.28 w/m² k) 



 Our 130mm walls consist of a 70mm cavity that is filled with 70mm foil-backed polyurethane insulation, much more effective than rockwool or polystyrene. This helps reduce heating costs further and is perfect for anyone wanting to use their cabin all-year-round (U-Value 0.29 w/m² k).




The 145mm walls have a 70mm air cavity in between walls which in itself provides more insulation than just the timber alone giving a U-Value of 1.28 w/m2k. If you opt to purchase the Polyurethane 'Wall Insulation', we will supply you with 70mm thick foil backed Polyurethane insulation. This is a fantastic insulator, and far more effective than rockwall or polystyrene, and brings the U-Value down to just 0.29 w/m2k. This insulation helps reduce heating costs further and is ideal for anyone who intends to use their cabin all year round.
The 145mm walls with a 70mm air cavity left unfilled, without any Polyurethane insulation in the walls, has a U-Value of 1.09w/m2k proving that it provides more insulation than the timber alone. If you chose to opt for our Polyurethane insulation which, as an insulator is roughly twice as thermally efficient as loft insulation, gives the wall a U-Value of just 0.26 w/m2k.