Looking for sauna timber in Melbourne that can sit inside an 80–100°C room week after week without cupping, cracking or leaching resin onto bare skin? That’s a narrower brief than most timber categories, and it’s why Melbourne Timber Supplies runs a dedicated sauna timber range rather than pointing customers toward general cladding boards. Everything in this collection has been thermally modified before it reaches our yard, a kiln process that drives moisture and sugars out of the timber’s cell structure so the board stays stable under sustained heat and steam. If you’re pricing up a home sauna, fitting out a day spa, or sourcing materials for a commercial wellness build, this is where to start.
Our sauna timber Melbourne range spans three species — Aspen, Spruce and Pine — across half a dozen profiles, plus a pre-finished black cladding option for anyone chasing a more architectural look straight off the truck. We supply trade sauna installers, spa fit-out contractors and DIY renovators from our Deer Park yard, with delivery reaching Pakenham, Geelong, Ballarat and Bendigo. Bulk buy pricing is available on request for larger commercial jobs, so it’s worth calling ahead rather than pricing board-by-board if you’re cladding an entire wellness centre.
You can buy sauna timber online through the product pages below or call our team directly to check current stock and get a sauna timber price for your specific job. The main lines in our sauna cladding range are:
Thermo Aspen is probably the most requested species on this page, and once you’ve seen it installed it’s obvious why. The timber has a naturally pale, almost white tone with a fine, even grain that keeps a sauna room feeling bright rather than closed-in, and the thermal modification process only improves on that stability. We stock it in three profiles: STEP (64x27mm) for a bolder shadow line, STS-4 (120x15mm) for a wider board with a tighter tongue-and-groove join, and the compact KYTE-S (60x15mm) for tighter spaces or detailed panelling work.
Use Thermo Aspen for:
Aspen starts with a naturally low resin content, which matters in a sauna — it’s part of why installers reach for it ahead of ordinary softwood cladding when a client doesn’t want sticky residue building up on the boards over summer.
Thermo Spruce cladding and panelling sits at a more accessible sauna timber price point than Aspen without giving up much on performance. We carry the Raw C26 Natural Dressed profile at 141x19mm for anyone who wants to oil or finish on site, plus two pre-finished options — Black Pearl and Sandy Pearl — in a wider 186x20mm board for a more architectural, dark-toned look that arrives ready to install.
Use Thermo Spruce for:
The fine, tight grain in Spruce takes the modification process well, and going with a pre-finished board saves a step on site since there’s no oiling or staining required before it goes up.
Thermo Pine is where most of the profile variety in our sauna timber range sits. The Stripes CAR3-G profile (138x19mm) has a grooved face that plays with light and shadow differently to a flat board, while the Intense range — available in the CLAD65 and C7J profiles — goes through a more intensive heat cycle for a deeper, richer colour that runs through the timber rather than sitting on the surface.
Use Thermo Pine cladding for:
Pine tends to sit toward the lower end of our sauna timber price range, which makes it a sensible place to start if you’re comparing species before committing to a full material order.
For a striking, ready-to-install black finish, Ignite 5 is worth putting on your shortlist. It’s a pre-finished, thermally modified cladding board available in two sizes — 140x20mm with 131mm cover, and a wider 186x20mm with 180mm cover — so you can match the board scale to the size of the room.
Use Ignite 5 for:
Because the black finish is applied at the mill rather than on site, every board carries the same even colour, which is genuinely hard to match if you’re staining or oiling individual lengths yourself.
Not every sauna build needs a full cladding profile. Our Benchmark Thermo Pine/Spruce Battens (42x42mm) give you a square-section option for screening, feature battening and structural support around a sauna structure.
Use Benchmark battens for:
They’re milled from the same thermally modified stock as our cladding, so colour and heat performance stay consistent if a job calls for battens alongside Thermo Pine or Thermo Spruce boards.
Ordinary softwood doesn’t cope well with a room that swings between ambient temperature and 90°C-plus several times a day. Thermal modification changes that by heating the timber to a high temperature in a low-oxygen kiln, which permanently alters the cell structure rather than just coating the surface. The result is a board that:
None of this is marketing gloss — it’s the reason sauna builders specify thermally modified Aspen, Spruce and Pine ahead of standard treated pine or basic hardwood, and it’s why we’ve built a dedicated sauna timber category rather than folding these boards into general cladding.
Profile names on this page — STEP, KYTE, STS, CLAD — refer to the shape of the tongue-and-groove join and how much face is visible once boards are installed, rather than the species itself. Coverage figures (for example, 121mm or 175mm cover) tell you how much wall area one board actually finishes once it’s overlapped or grooved into the next, which is the number to use when you’re calculating quantities rather than the raw board width. As a rule of thumb, order a little over your measured area to allow for cutting waste and end-matching, particularly around door frames, benches and corners.
If you’re unsure how much sauna timber to order, our timber conversion calculator can help you get from square metres to board count, or you can call our team with your room dimensions and we’ll work it out with you.
The species you pick often comes down to who’s using the room and how often. A home sauna that gets used a few evenings a week can usually run on Thermo Pine or Raw Thermo Spruce without any issue — the heat cycling is less frequent, and a lower sauna timber price point makes sense when you’re fitting out a single room. A commercial sauna or day spa that runs multiple sessions a day, back to back, tends to do better with Thermo Aspen or one of the pre-finished boards like Ignite 5 or Black Pearl Spruce, simply because the boards are handling more heat cycles and more contact with bare skin over the life of the fit-out. Neither approach is wrong — it’s really a question of budget against how hard the room will be worked.
It’s also worth thinking about where the timber sits inside the room. Bench seating and lower wall sections that get direct skin contact are usually better suited to Aspen, given its low resin content, while ceiling and upper wall cladding has more flexibility since it’s not touched directly. Mixing species within one build isn’t unusual — plenty of our customers order Aspen for the bench and lower walls, then Pine or Spruce for the rest of the room to manage cost.
Q1: Can I use any timber for a sauna?
Not really. Standard softwood cladding hasn’t been through the thermal modification process, so it holds more moisture and resin, which means a higher risk of warping, sap bleed and off-gassing once the room heats up. That’s the whole reason a dedicated sauna timber range exists rather than customers being pointed to general cladding stock.
Q2: What’s the difference between Thermo Aspen, Spruce and Pine?
All three go through the same thermal modification process, but the species themselves behave differently. Aspen is paler, finer-grained and lower in resin, which is why it’s the go-to for bench seating. Spruce sits in the middle on both look and price. Pine offers the most profile variety and tends to be the most budget-friendly of the three, particularly in the Stripes and Intense ranges.
Q3: Do I need to oil or finish the timber before installing it?
Raw profiles like the STEP, STS-4, KYTE-S and Raw C26 boards can be left natural or oiled to suit the space. Pre-finished boards — Black Pearl, Sandy Pearl and Ignite 5 — arrive with the black finish already applied at the mill, so there’s nothing extra to do before installation.
Q4: How much sauna timber do I need to order?
Use the coverage figure listed against each profile (for example, 121mm or 175mm cover) rather than the raw board width, since that’s what one board actually finishes once it’s fitted against the next. Add a bit extra for cutting waste around doors, benches and corners — our timber conversion calculator can help if you’re working from a floor plan.
Q5: Can Thermo Pine or Spruce be used outdoors as well as inside a sauna?
Yes. Because thermal modification improves rot and moisture resistance across the board, most of our sauna cladding range doubles as external cladding for feature walls, facades and weather-exposed areas outside the sauna itself.
Whether you’re after a small batch of Thermo Aspen for a home sauna or a bulk buy price on Ignite 5 for a commercial fit-out, our Deer Park yard stocks the sauna timber Melbourne builders and installers ask for by name. Browse the sauna cladding range above, or contact us directly for current stock levels, a sauna timber price on your quantities, and delivery options across Deer Park, Pakenham, Geelong, Ballarat and Bendigo.
Our team deals with sauna installers and spa fit-out contractors regularly, so if you’re not sure which species or profile suits your build, we’re happy to talk it through over the phone before you place an order. Send us your room dimensions and preferred look, and we’ll put together a sauna timber price with a profile recommendation to match.
