Grade & Species:

• Premium Scandinavian redwood, 5ths & better
• 8 % Moisture content

 

Why Choose ThermoWood?
ThermoWood is an innovative, thermally modified wood that offers outstanding durability, stability, and lasting appeal without use of harmful chemicals in production.

Its superior resistance to rot, fungal attack, decay, and damage makes it an ideal choice for saunas, outdoor structures, and both residential and commercial projects. Rated class 2 durable, ThermoWood can last up to 60 years as external cladding when properly maintained.

• Revolutionary and Cost-Effective
  Transforming traditional timber into a visually appealing and exceptionally stable material, ThermoWood is a long-lasting, attractive option.
• Enhanced Durability
  The thermal modification process fortifies the wood, increasing its resilience against the elements. This product does not require any preservatives or coatings.
• Excellent Insulation
  ThermoWood helps maintain ideal temperatures.
• Low Maintenance
  With minimal upkeep required, ThermoWood stays beautiful while saving you time and money.
• Timeless Aesthetic
  Left untreated, it naturally weathers silver in colour. For a refreshed look, simply apply paints or oils or stains.

 

Appearance
ThermoWood has a desirable consistent dark brown colour with frequent sound knots. It can be oiled or wood stained if desired.

 

Low Maintenance & Versatility
The thermal modification process, improves; appearance, durability, stability and longevity characteristics. The modification process provides resistance to rot, decay, and insects. Classified as a Class 2 durable softwood, it offers a service life of up to 60 years when properly maintained, outperforming many hardwoods. ThermoWood does not require treatment or preservatives, making it a hassle free and cost-effective choice in the long run.

 

Sustainable

• Grown in regulated and responsibly managed European and Scandinavian forests, our ThermoWood is acquired from FSC & PEFC certified sources. By choosing ThermoWood, you’re supporting eco-friendly practices.

 

Customized Profiles & Lengths:

• Efficient Length Selection: Opt for board lengths that best fit your project’s requirements and help reduce overall costs.
• Customised aesthetic: Choose from various custom-machined profiles to align with your design vision.
• All profiles supplied with finished depth of 18mm

 

Applications

• Exterior cladding for residential and commercial buildings
• Saunas and extreme environments
• Feature walls and accent panels
• Garden structures and outbuildings

 

Wastage Allowance:

• We advise over ordering by 10%, our ThermoWood is quality checked and its premium industry standardized grade is 5ths & btr excl 6ths.
• No more than 10% of the boards may contain workable naturally occurring defects such as minor surface splits, end splits, and even occasional dead knot holes but in no more that 10% of boards received. Knots that are sound but cracked are characteristic of this product and not classed as defects.

Fixing Types:

All screws, nails, bolts and metallic accessories that come into contact with this product must be corrosion resistant. We recommend:

• Stainless steel

If fixings other than stainless steel are used there is risk of permanent spotting and corrosion stains appearing on the surface. This is due to naturally occurring acidic oils.

Should I use screws or nails for fixing?

• Thermowood cladding can be fastened using annular ring shank nails or lost head nails for a more discreet appearance. Screws are also suitable. Fixings should sit flush with the surface, avoid countersinking or punching below the surface to prevent splits and head pull-through.

What size Screws or nails do I need?

• Ring shank or lost head nails should be a minimum diameter of 2.0mm.
• Screws should be a minimum diameter of 3.5mm – pre drill pilot holes 2/3rds of shank diameter to minimize risk of splitting.
• Minimum length of nails and screws should be the depth of the cladding plus at least 25mm.

Installing ThermoWood cladding:

• Our ThermoWood is supplied heat treated to a moisture content below 10%, meaning no drying is required prior to installation, its ready for immediate installation, even inside saunas.
• Fixing through the face is most secure.
• If board is below 100mm in width insert one centrally placed fixing at every batten.
• If the board width ranges from 100mm to 200mm wide, insert two fixings where the board crosses a batten, positioning the fixings approximately 25mm to 50mm from the board edges.
• Cladding profiles with hidden nail recesses exceeding 100mm in width, should have one fixing inserted into the face spaced approx. 25 – 50mm from the groove and another fixing inserted at an angle into the hidden fixing recess next to the tongue.
• It is not recommended to completely hide the fixings. Instead, ensure your cladding is securely and properly fitted by following this guidance.
• Battens external cladding is fitted to should be treated to protect your structure from moisture.
• ThermoWood should be secured to battens, battens can be drilled secure to a brick wall using 6mm masonry drill bit and matching screw plugs. Battens can also be screwed using pilot holes into plywood sheets.
• Do not secure ThermoWood cladding directly to plywood or sheet materials.
• Exposed end grain of boards should be protected with either trims, metal capping or end grain sealant.
• Optional, leave a 175mm gap between the ground and the cladding to prevent the bottoms of the boards from being exposed to ground level moisture, dust and general splatter.
• For horizontally installed cladding battens should be vertically installed.
• For vertically installed cladding battens should be horizontally installed.
• Fixing centres should be a maximum of 600mm apart.
• Batten material should have the same service live as the cladding being chosen, we advise battens used are graded and are pressure treated.
• Minimum batten or lath dimensions should be 50 x 38mm or 50 x 25mm if being counter battened.
• L shaped trims are intended for use on external and internal corners, as well as door and window surrounds, L shaped trims are also used to achieve straight horizontal and vertical lines where minute differences in cut cladding length would be otherwise noticeable.
• In the absence of ThermoWood L shaped trims it is also possible to miter joint two pieces of planed square edge timber together, PSE can be created with an on site table saw, cutting edges on a 45° angle, edge glueing and pinning secure.  
• ThermoWood is dry and ready to absorb aftermarket oils and coatings.
• If staggering runs together, ensure they are jointed on battens and also edge glued together to prevent separation and end grain water splotching.

Cavities:

• Cavity ventilation barrier of 10mm or more is required to prevent long term moisture build up. Fixing your ThermoWood cladding to battens as per above guidance will achieve this. 
• Metal vermin mesh should be fitted at all cavity entrances
• Optional; breather membrane to be fitted to ply / brick wall battens are secured to, for added moisture protection, (is essential in saunas.)

How we Deliver:

We provide cost-effective and dependable shipping solutions for any order size, whether you need a single length delivered next day, 300 miles away, or hundreds of lengths for a larger project. Our extensive network of haulage partners ensures your timber arrives on time and in perfect condition.

 

• Delivery Quotes:
  Easily calculate your shipping costs on our cart page, or get in touch via phone or email for a personalized delivery quote.

 

• Nationwide Coverage:
  We work with a variety of reliable carriers, including Royal Mail, Parcelforce, DX, Pallet Network as well as dedicated heavy goods vehicle hauliers, and long-wheelbase van hauliers. This broad network guarantees reliable, cost effective national coverage.

​​​​​​​

• Despatch Times:
  Estimated despatch times are displayed on product pages, helping you plan your projects with confidence.

​​​​​​​

• Assistance:
  If you’d like a call before delivery, let us know when placing your order. Please note that DX and Parcelforce offer all-day delivery slots, so we cannot provide an exact notice of arrival. For any issues at checkout or if you need additional support, don’t hesitate to contact us for a customized quote.

​​​​​​​

• Kerbside Deliveries:
  All deliveries are made to the kerbside, at the entrance of your property. The delivery driver may ask for help with offloading if required. If no one is available to receive the goods, and you have given permission in advance, we may leave your order in a safe place near the front of your property. Otherwise, re-delivery is usually arranged for the next working day.

​​​​​​​

Whether you’re ordering small samples or bulk timber supplies, our network and expertise ensure competitive pricing and dependable service. Please note that to maintain our advertised delivery timeframes and minimize costs, we may occasionally use a different haulier than the one specified at checkout.

Returns & Refunds Policy

• Our Promise to You

  • Customer Centric Approach: Your satisfaction is our priority. Should you have any concerns or questions about your order, please reach out to us immediately. Our team strives to respond with a fair resolution as quickly as possible.

 

• 30-Day Return Period

  • Flexible Returns: You may return any item(s) within 30 days of delivery if you are not fully satisfied—whether due to a product issue or simply a change of mind.

 

• Condition for Returns

  • Original Condition Required:

    • To qualify for a full refund, items must remain exactly as you received them.

    • If your order cannot be returned in full we will accept return of part of the order which meets the criteria for a refund.

    • Timber should not be cut, nailed, painted, oiled, or altered in any way.

    • Products should be stored and handled appropriately to avoid damage (e.g., not left uncovered outdoors).

 

• Ineligible Returns: If lengths of timber have been modified, used, or otherwise changed from original condition, such lengths will not be eligible for a refund.

 

• Quality & Imperfections

  • Pre-Despatch Checks: We inspect each order before it leaves our facilities.

  • Product Discrepancies: In the rare case you receive more imperfections than described, we will replace the affected pieces or offer a full refund, including transport costs or offer a refund for part of the order where lengths which are not used or otherwise returnable.

 

• Initiating a Return

  • Contact Us: Reach out by phone or email to inform us of your intention to return an item. We will provide step-by-step instructions.

  • Proper Packaging: Use the original packaging if possible, (we can ship more packaging if needed) and ensure the timber is secured to prevent damage during transit.

  • Shipping Arrangements: We can help organize a collection or give you the return address if you prefer to arrange your own courier. We can use a different carrier to the one we delivered with if you prefer.

  • Inspection Upon Arrival: Once we receive the returned items, our team will assess their condition to confirm eligibility for a refund.

 

• Refund Processing

  • Transport Costs: For returns due to personal preference or reasons unrelated to product quality, the cost of transporting the items back to us will be deducted from your refund.

  • Full Reimbursement: If we determine the product is faulty or not as described, we will issue a full refund, covering all transport costs.

  • Refund Timeline: We aim to process refunds within 48 hours of receiving and verifying the returned order.

  • Trade Customers: If you are a trade customer, you may opt to receive a credit note for future purchases instead of a direct refund.

 

• Damaged or Faulty Deliveries

  • Immediate Notice: If your order arrives with visible damage, please take photographs and contact us as soon as possible.

  • Resolution Options: Depending on the issue, we will facilitate a replacement, a refund, or a solution that ensures your continued satisfaction.

 

• Continuous Improvement

  • Open Communication: The sooner you alert us to any concerns, the faster we can address them.

  • Our Commitment: We value lasting customer relationships, which is why we handle all issues promptly and professionally. Your feedback helps us refine our products and services for future customers.

• Applying preservatives to externally installed ThermoWood is optional. In order to enhance the natural appearance and to delay the silvering process we advise using a quality protection oil such as Osmo 010 ThermoWood this oil is suited for all types of ThermoWood including cladding and decking. This will slow the weathering / silvering process as well as enhance your product. Re apply every 2 – 3 years to maintain enhanced natural appearance indefinitely.
• Once your cladding has eventually silvered you may like the silver colour as many customers do, some customers achieve this faster by applying weathered aged wood accelerator for a unique and sort after natural worn aesthetic.  
• If you want to revive your timber once silvered off there are numerous solutions that will bring your timber back. Depending on how weathered your wood is you may be able to apply wood stain straight onto it, try sampling a small section to see.
• If your species is vulnerable to fungal attack we advise mixing Owatrol VC175 Mould Killer a powerful internal and external anti fungal additive mixable with any oil, varnish lacquer, wood stain or paint, simply mix with your preferred coating for lasting protection. Note: ThermoWood is not vulnerable to fungal attack it naturally resists fungus.
• If your wood is heavily weathered, we advise using a power washer after scrubbing the wood with a mixture of water and bleach. Though labor-intensive, this process is cost-effective. Ensure you wear appropriate personal protective equipment. This method is also effective for removing algae, mildew, and fungus. After cleaning, apply protective oils, lacquer, and stains for long-lasting protection and satisfaction with your wood. Do not power wash softwoods with a finished depth of less than 18mm. Avoid positioning the water jet close enough to damage the timber.

• ThermoWood does not require stickering or acclimatizing since it Is already thoroughly dried out in production.
• Please contact us before delivery to ensure you are prepared. If anything is not right, submit a complaint immediately, and we will be happy to assist.
• Its advised to store your timber either indoors, or outside under ventilated and weighed down tarpaulin sheets and or in a shaded area where the elements cannot reach your wood.
• If you decide to sticker your order, the sticks for drying on site must be clean and ideally planed to minimize marks. Any faint marks caused by stickering will fade away over time.
• Timber should be stored raised above ground.