What is Thermowood?


Thermowood is produced by heat treating Spruce and Pine to temperatures in excess of 200 degrees centigrade. During the heat treatment, chemical and structural changes occur within the timber which alter and improve some of its basic characteristics. The resulting product is an altogether more durable and stable timber.

It has been known for centuries that burning the surface of wood in open fire will make it more durable in exterior use. The Vikings (700 -1050) used this method in outdoor structures such as fences.

The heat treatment of wood was scientifically studied in Germany and the USA during the 1930's and 40's. Research carried on in Germany in the 1950's through to the 1970's. More recently research work was carried out in Finland, France and the Netherlands in the 1990's when the technology gained momentum and was successfully developed for commercial use. The ThermoWood® process has been developed by VTT Technical Research Centre of Finland in Helsinki www.vtt.fi

Are the cabins insulated?


While we do not offer a cavity wall system, the cabins are built from thick cuts of Thermowood, which has good insulation and thermal properties. If required, the Oval series can have underfloor insulation installed - please see the image below under bearers.

Do you deliver the cabins?

Yes, nationwide delivery is available, Our cabins come in a kitset package and will be delivered to your local Toll depot. The package dimensions are approx 3-4m x 1.2m x 1.2m. 

How long do the cabins take to build?


If you are starting with a flat and level surface then two people can build a cabin in two days.

Who can build the cabin for us?


You most likely can do it yourself as they come with excellent instructions, if not a handyman or builder can build them.

Do I need to treat the wood?


The exposed wood on the exterior of the cabin should be treated with a suitable wood oil. The interior wood treatment is optional.

The kits come with Pinotex Solar Terrace Oil that can be used to treat the Thermowood. They also come with Thermo Special which can be used to paint the details to look like Thermowood.

You can download the Pinotex data sheet here.

You can download the Thermo Special Oil here. More general information can be found here.

What ongoing maintenance is required?


To keep in in its very best condition the exterior can be oiled annually. Thermowood is used as cladding, so has similar properties to H3 treated pine or natural cedar so its naturally resilient.

How do I level an area for my cabin?

Step by step guide - here

How are the bearers setup?

Here is a picture of the bearer system setup with the first stave (plank) laid down. Note the first stave has 2 convex sides to which the respective staves will be added.





What are the straps made from?

The straps are made from 304 grade stainless steel.

How is electricity provided?

the cabins do not come with any electrical fittings. If you are close to an electricity supply then an electrician should able to wire in a 240v supply. You could also use a solar system or a generator to supply electricity.

Are the doors and windows double glazed?


We ship anywhere within New Zealand

Barrel Cabins & Sleepouts | info@curvedconstructions.co.nz | 0800 GO CURVED (0800 46 2878)

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