Thermally Modified Sauna Wood
Combining contemporary style with conscious craftsmanship, our thermally modified British cladding makes an exceptional choice for sauna wood interiors and exteriors. Our thermally modified sauna timber undergoes a controlled heat treatment which enhances its natural durability, creating a non-toxic, resilient surface that thrives in high heat and humidity. For saunas that look and feel exquisite, our British Ash and Poplar offers a truly luxurious finish with long-lasting performance.Request a quote
Our Thermally Modified Cladding for Saunas
Chemical free and exclusively grown, milled and manufactured in the UK, our 100% British thermally modified sauna cladding delivers an elegant interior finish to sauna builds.
With a constant cycle of heat and humidity, testing every grain and joint, sauna timber cladding must be able to withstand the harsh internal environment and offer durability coupled with a beautiful look and feel. Our thermally modified cladding offers warp-resistance from moisture changes, remaining smooth and comfortable to the touch despite high temperatures. Our non-toxic production of timber means that there is no chemical bleed and no nasty resins, keeping your sauna both durable and serene.
From forest to finished sauna, our hardwood cladding is 100% grown, designed and produced in Britain, making it the perfect sustainable alternative to the traditional Scandinavian, or tropical hardwood sauna cladding.
Thermally Modified Sauna Wood Applications
Our Thermally Modified Sauna Wood Specification
Experience the unmatched durability of our Thermally Modified sauna timber, crafted to withstand the challenge of high moisture and humidity in sauna applications both internally and externally. Carefully produced using a globally renowned Thermo Vacuum System from WDE Masspell, our timber is heated to extremely high temperatures in a vacuum atmosphere, with no chemical additives.
This chemical-free process modifies the timbers’ characteristics on a cellular level to enhance durability and stability, ensuring excellent performance even exposed to the elements. The thermal modification process transforms the timber’s resistance to decay, rot and insect damage, ensuring long lasting performance up to 60 years.
Rest assured, as the UK’s largest and most energy-efficient Thermally Modified plant, the production process is 100% eco-friendly. We run our plant and all of our machines using on site solar energy. Our Hardwood Timber for saunas is fully traceable, locally sourced and carefully transformed from tree to board in our family-run yard in Devon. All UK Hardwoods products are certified ‘Grown in Britain’, allowing customers to support British forestry and local industries with pride.
- Thickness of 18-21mm planed or unplanned at 28mm
- Finished widths 70mm / 95mm / 120mm / 145mm
- Varied lengths 0.9 mt – 4.5 mt
- Available in TG&V, Square Edge, Shadow Gap & other profiles available
- No treatment necessary
- Natural and toxin-free
- Rich chocolate-brown hues with a strong grain pattern, accented by occasional knots. This will beautifully silver with weathering.
- Handle with care during installation
- Less odour than other modified timbers so can be used internally
- Nationwide delivery
Download our Thermally Modified Sauna Wood Brochure
Opening up new possibilities for interior and exterior sauna applications, download our brochure to find out the properties and uses of our thermally modified timber.
Thermally Modified Cladding Features
Species
Our Thermally Modified Cladding is created using Ash or Poplar.
Weathering
Rich chocolate brown hues turn to a silver over time when used outdoors.
Chemical Free
Completely chemical free process.
Paint Coating
No need to paint or treat.
Sustainability
Most energy efficient thermal modification plant in the UK run from solar energy.
Origin
Sourced from certified UK Woodland Trusts and Estates.
Appearance
Unique grain pattern with minimal knots.
Stability
Super stable due to its hydrophobic nature.
Surface Finishes
Rough sawn or planed.
Application
Can be used for cladding, sauna interior and exteriors, and hot tubs.
Durability
Lasts up to 60 years.
Density
670-700 kg/m³
Secret Fixing
Sleek finish with no visible fixtures.
Our Thermally Modified Cladding Profiles
Able to be tailored and shaped to your specific needs, we have many different profile types available to suit all styles, projects and budgets. Chat to our team to find out more.
UKHW 1
UKHW 2
UKHW 3
UKHW 4
UKHW 5
UKHW 6
UKHW 7
Not sure what you need?
Thermally Modified Sauna Wood FAQs
What is the least toxic wood for a sauna?
Thermally modified wood is a fantastic choice when avoiding toxic coatings that could come into contact with skin. Our thermally modified wood goes through a natural process which permanently changes the wood’s structure, enhancing both stability and durability without introducing any chemicals or coatings.
How thick should sauna wood be?
The thickness of sauna wood typically ranges from 11mm to 20mm thick. Our thermally modified cladding is 20mm thick which offers durability and heat retention, although we can adjust this if needed.
Best types of wood for building a home sauna?
The best types of wood for a home sauna are the ones that are durable, resistant to rot, heat- and moisture-resistant, plus provide a smooth texture that won’t warp. Thermally modified British Ash and Poplar are wood that ticks all of these boxes, making it a fantastic choice for both interior and exteriors of a sauna.
How do I choose the right sauna wood for heat resistance and durability?
When it comes to choosing the right sauna wood for heat resistance and durability, you need to opt for materials that can withstand high temperatures without absorbing moisture or warping over time. Dense, slow-grown hardwoods, such as our thermally modified Ash or Poplar, perform best because they stay stable in fluctuating heat and humidity while offering long-term structural strength
Which wood is best for saunas?
We’d recommend thermally modified Ash or Poplar for saunas, because they offer a balance of beauty, durability and comfort staying cool to the touch. They are resistant to moisture and heat fluctuations, and maintain their shape and colour for decades without the need for ongoing treatment – perfect for a contemporary sauna.
What is the best material for a steam sauna?
The best material for a sauna is wood that creates a relaxing atmosphere, but also is practical and long-lasting despite the moisture inside the sauna. We recommend our thermally modified British Ash or Poplar because they can stand up to the challenge of constant steam and won’t shrink, swell or twist when exposed to changing heat and humidity.
Can any wood be used for a sauna?
No, there are a lot of considerations to be made when finding the perfect wood for your sauna such as heat resistance, durability, moisture tolerance, and even how it ages over time. With this in mind, our thermally modified British Ash or Poplar make the ideal sauna wood as they offer stability, comfort and performance no matter what elements they are exposed to.
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