Thermo Spruce Sauna Wood Cladding STP 90mm by Thermory (Pack of 6) 

Thermo Spruce Sauna Wood Cladding (STP)

Our Thermory STP sauna wood cladding is a refined choice for the walls and ceiling of your sauna. The easy to install tongue and groove cladding is also suitable for other interior finishes. The STP profile has narrow grooves and rounded edges that create a soft finish once installed. The grooves behind each panel allow condensed steam to run down and drain to the floor. The STP cladding can be used with other sauna wood profiles to create contrast in the space for a unique finish.   

The STP tongue and groove cladding are great for fitting in a DIY sauna.   

Click on the "Downloadable Files" tab above to see an Installation and Maintenance Guide for our sauna wood cladding.  

About our Thermo Spruce Sauna Wood Cladding 

Thermo spruce has a charming, natural golden-brown tone that is the result of heat-treating natural spruce. The thermo-treatment process makes the wood more durable and removes the resin, so there is no risk of weeping from the knots. It can be used to good effect when brushed to create an aged wood effect for a rustic look.   

You can learn even more about the qualities of Thermo Spruce by click the following link: Thermo Spruce Sauna Wood 

Information on our STP Profile 

Choosing sauna panels is all about your personal preference and we have styles to fit the atmosphere and interior specs you wish to create. The STP profile offers an elegant wall surface for your sauna, with narrow gaps between each cladding board. STP’s rounded front edges can have a “softer” appearance than Kallio or STS4 cladding. Like all our cladding profiles, STP boards can be combined with other options to achieve your own unique look. 

 
If you want to learn more about our STP cladding option and to find more timbers in this specific profile, click the following link: Sauna Cladding – STP Profile 

Key information on your selected product: 

• Thickness: 15mm 
• Width: 90mm 
• Effective width: 80mm 
• Package size: 6 pcs (i.e. 6 cladding panels in one pack) 

Please note that as a natural product, timber has some colour variation between different packs and batches. 

We also offer different choices of timbers for your cladding, depending on the overall aesthetic and style of your sauna. Click the following link to get to our wider Sauna Wood Cladding Collection for more timber varieties.    

About our Timber Supplier Thermory 

Thermory is renowned for being the largest manufacturer of thermally modified wood in the world. Founded in 1997 in Estonia, Thermory strives to provide sustainable sauna materials that are durable, elegant and functional. Their fully natural, chemical-free thermally modified wood is their stamp product but their sauna wood selection has a large variety of untreated timber as well.     

If you want to learn more about this supplier and discover more products from Thermory, click the following link: Our Timber Supplier Thermory. 

Wastage Allowance for Thermo Spruce Cladding  

Our thermo spruce sauna timber is of A-grade quality, characterised by their durable, knot- free and low risk of splintering properties. As such, we recommend a wastage allowance of 20% for our thermo spruce wood sauna cladding. This also takes into account any potential risk of damage that can occur during transportation. 

Click the following link to get more information on Wastage Allowances and to use our interactive Cladding Calculator. 
 

Contact us to find out more about different sizes and quantities and if you are unsure how much you require for your sauna build.    

Shipping Information on Sauna Timber 

Depending on the size and quantity of your sauna timber order, the shipping costs may vary and will be calculated at checkout. Shipping costs also differ between UK Mainland, Highland and Island postcodes. Many of our timber products will be shipped using a palletised shipping service due to their big and bulky nature and may require a kerbside drop or handballing off the freight vehicles. Please take time to read our Shipping and Delivery Information carefully before placing an order for our thermo spruce cladding. 
 
Please note that due to certain constraints of our shipping networks, we usually ship timbers of up to 2400m lengths, beyond those lengths the costs for shipping will increase quite significantly. If you do require longer timber lengths, our shipping calculator will indicate associated costs for such shipping. 
 

If we do not have your required length, but have a longer length available, to avoid higher shipping rates, it is worth considering our cutting service. You will still need to purchase the full length, but for a small fee, we can cut this down to your desired length to help reduce shipping costs. The off-cut will be added onto the pallet. 
 
For longer lengths or our cutting service, please call or email our Customer Service Team who will be happy to arrange alternatives (+44 (0) 20 8050 2895 or support@finnmarksauna.com). 

Christmas and New Year's Shipping Update (Updated 2nd December 2025)

Please note the following changes to our pallet shipping and DPD delivery service on parcel orders over the Christmas period.

Our warehouse is fully closed for operation over the following days: Wednesday 24 December, Thursday 25 December, Friday 26 December, Wednesday 31 December and Thursday 1 January.

Orders requiring a pallet

The last dispatch date for orders requiring a pallet is Friday 19th December 2025. Pallet orders dispatched on this day must be booked and signed for with one of our sales team in advance.

Please note:

• Pallets dispatched on 19th December will be delivered on either 22nd or 23rd December, depending on your postcode
• We strongly advise against booking deliveries to the Highlands or Channel Islands close to the 19th December, as these may be held at the hub over the festive period
• There may be limited availability for pallet shipping on this day and we cannot guarantee that available slots remain

We will commence our regular pallet shipping service on Monday 5th January 2026.

If you have any questions about your pallet order, please get in touch with our Sales team: +44 (0) 20 8050 2895 or email info@finnmarksauna.com

Small Parcel Orders

DPD will deliver as normal up to and including Tuesday 23rd December 2025. Our daily cut-off for next day delivery is 2pm, with orders placed by 3pm on Tuesday 23rd December being our final dispatch before Christmas. Whilst we use a DPD Next Day delivery service, this is not a guarantee - please order earlier to avoid disappointment.

Limited dispatch service: We will dispatch DPD orders on Monday 29th December and Tuesday 30th December only during the festive closure period.

We will commence our regular delivery service on Monday 5th January 2026.

*Estimated delivery times are applicable to the UK mainland only (excludes Highlands and Islands). Additional delays and charges will be required for Non-UK Mainland and Highlands and Islands deliveries.