
Description
Description
Thermory's STS4 cladding in thermo spruce dresses sauna walls and ceilings in a warm golden-brown tone, the result of heat treating natural spruce. The profile takes its name from the 4 mm gap between boards, and its slim, angular grooves suit modern saunas where a symmetrical aesthetic is wanted. The thermo treatment improves durability and removes the resin, so there is no risk of weeping from the knots, and the wood can be brushed for an aged, rustic effect. Each pack contains six boards at 15 × 90 mm, available in 2100 mm and 2400 mm lengths.
Features
Technical Specification
| Dimensions | |
| Thickness × width | 15 × 90 mm |
| Lengths | 2100 mm or 2400 mm |
| Pack size | 6 pcs |
| Details | |
| Profile | STS4 (4 mm gap between boards) |
| Timber | Thermo spruce |
| Grade | AB-grade |
| Use | Interior cladding for sauna walls and ceilings |
| Manufacturer | Thermory AS |
Timber
Thermo spruce has a natural golden-brown tone created by heat treating natural spruce. The thermo treatment makes the wood more durable and removes the resin, so there is no risk of weeping from the knots, and the boards can be brushed to create an aged wood effect for a rustic look.
Profile
The STS4 profile takes its name from the 4 mm gap between each board. Its slim, angular grooves create a symmetrical, strong aesthetic, which makes it a popular choice in modern and contemporary saunas. STS4 can also be combined with other wood profiles to create a distinctive interior.
Quality & Wastage
Our thermo spruce sauna timber is AB-grade, durable and with a low risk of splintering. We recommend a wastage allowance of 20% for this cladding, which also covers any risk of damage in transit. As a natural product, timber shows some colour variation between packs and batches. Other timbers are available in our wider sauna wood cladding collection.
Installation & Care
This cladding is well suited to a DIY project. An installation and maintenance guide for our sauna wood cladding is available under the Downloadable Files tab on this page. We recommend treating the wood with paraffin oil, which slightly deepens its colour. Lifestyle images are for representation only; the finished look varies with the width and placement of the cladding.
Brand
Thermory, founded in Estonia in 1997, is the largest manufacturer of thermally modified wood in the world; its chemical-free thermal modification sits alongside a wide selection of untreated sauna timber.
Ordering & Delivery
Timber orders ship on a palletised service because of their size and length, with costs calculated at checkout; rates differ between UK Mainland, Highland and Island postcodes, and delivery may be a kerbside drop requiring goods to be handballed off the vehicle. We normally ship lengths of up to 2400 mm; longer lengths increase shipping costs significantly. If we do not stock the length you need but hold a longer one, our cutting service can cut it down for a small fee: you purchase the full length and the off-cut travels on the pallet. For longer lengths or the cutting service, call +44 (0) 20 8050 2895 or email support@finnmarksauna.com.
Delivery & Returns
Delivery
We offer fast and reliable delivery to customers across the UK and beyond. For full details on shipping times and costs, please review our delivery policy.
Returns
We offer hassle-free returns within 30 days of purchase, so you can shop with complete confidence. For details, see our returns policy.
Warranty & Quality Promise
We are committed to delivering products of the highest quality, for details surrounding warranty please contact us.
Description
Thermory's STS4 cladding in thermo spruce dresses sauna walls and ceilings in a warm golden-brown tone, the result of heat treating natural spruce. The profile takes its name from the 4 mm gap between boards, and its slim, angular grooves suit modern saunas where a symmetrical aesthetic is wanted. The thermo treatment improves durability and removes the resin, so there is no risk of weeping from the knots, and the wood can be brushed for an aged, rustic effect. Each pack contains six boards at 15 × 90 mm, available in 2100 mm and 2400 mm lengths.
Features
| Dimensions | |
| Thickness × width | 15 × 90 mm |
| Lengths | 2100 mm or 2400 mm |
| Pack size | 6 pcs |
| Details | |
| Profile | STS4 (4 mm gap between boards) |
| Timber | Thermo spruce |
| Grade | AB-grade |
| Use | Interior cladding for sauna walls and ceilings |
| Manufacturer | Thermory AS |
Timber
Thermo spruce has a natural golden-brown tone created by heat treating natural spruce. The thermo treatment makes the wood more durable and removes the resin, so there is no risk of weeping from the knots, and the boards can be brushed to create an aged wood effect for a rustic look.
Profile
The STS4 profile takes its name from the 4 mm gap between each board. Its slim, angular grooves create a symmetrical, strong aesthetic, which makes it a popular choice in modern and contemporary saunas. STS4 can also be combined with other wood profiles to create a distinctive interior.
Quality & Wastage
Our thermo spruce sauna timber is AB-grade, durable and with a low risk of splintering. We recommend a wastage allowance of 20% for this cladding, which also covers any risk of damage in transit. As a natural product, timber shows some colour variation between packs and batches. Other timbers are available in our wider sauna wood cladding collection.
Installation & Care
This cladding is well suited to a DIY project. An installation and maintenance guide for our sauna wood cladding is available under the Downloadable Files tab on this page. We recommend treating the wood with paraffin oil, which slightly deepens its colour. Lifestyle images are for representation only; the finished look varies with the width and placement of the cladding.
Brand
Thermory, founded in Estonia in 1997, is the largest manufacturer of thermally modified wood in the world; its chemical-free thermal modification sits alongside a wide selection of untreated sauna timber.
Ordering & Delivery
Timber orders ship on a palletised service because of their size and length, with costs calculated at checkout; rates differ between UK Mainland, Highland and Island postcodes, and delivery may be a kerbside drop requiring goods to be handballed off the vehicle. We normally ship lengths of up to 2400 mm; longer lengths increase shipping costs significantly. If we do not stock the length you need but hold a longer one, our cutting service can cut it down for a small fee: you purchase the full length and the off-cut travels on the pallet. For longer lengths or the cutting service, call +44 (0) 20 8050 2895 or email support@finnmarksauna.com.
Delivery
We offer fast and reliable delivery to customers across the UK and beyond. For full details on shipping times and costs, please review our delivery policy.
Returns
We offer hassle-free returns within 30 days of purchase, so you can shop with complete confidence. For details, see our returns policy.
Warranty & Quality Promise
We are committed to delivering products of the highest quality, for details surrounding warranty please contact us.





