Planning a sauna build, a wellness room, or an outdoor feature wall and want timber that can actually handle heat and moisture without warping in year two? That’s what Thermory sauna timber is built for. Every board in this range is thermally modified — heated under controlled steam to change the wood at a cellular level — so what you’re buying resists rot, shrugs off humidity, and holds its shape long after standard softwood would have cupped or split. If you’ve been searching for somewhere to buy sauna timber in Melbourne and compare it against a few other suppliers, this range is worth putting on your shortlist.
We stock the full Thermory lineup, which means you can shop sauna cladding, decking, battens and bench boards from a single supplier instead of chasing separate orders for each part of the build. Whether you’re fitting out a backyard barrel sauna, a commercial spa, or just want a feature wall that copies that Scandinavian look everyone’s after right now, our Thermo Aspen, Thermo Spruce, Thermo Pine and Ignite 5 ranges have you covered. Pricing is listed per board, so you can work out your square metre coverage and order sauna timber online without waiting on a quote — though if you’re pricing a bigger job, our team is always happy to put together a bulk buy price.
Popular Thermory product lines we supply include:
Aspen is the first timber most sauna builders reach for, because it barely holds heat, so it won’t burn bare skin the way a denser hardwood can against a hot bench. The STEP profile has a rounded face that’s comfortable to sit or lean against, which is why it’s the genuine choice for sauna bench timber rather than a cheaper stand-in.
Use Raw Thermo Aspen STEP for: sauna benches and seating, backrests, barrel sauna interiors, and commercial spa fit-outs.
A wider tongue-and-groove board built for sauna wall and ceiling linings. The extra width means fewer joints across a large surface, so if you’re lining a full sauna room rather than just a bench, this speeds up the install considerably.
Use STS-4 Aspen for: sauna wall panelling, sauna ceiling lining, and steam room interiors.
A narrower board off the same low-heat-retention aspen stock, suited to detailing work and smaller sauna cabins where a tighter board width just sits better with the room’s proportions.
Use KYTE-S Aspen for: compact sauna cabins, feature panelling, and trim or detailing around doors and vents.
This is the one to look at if you want black timber cladding that doesn’t need painting or staining on site. It arrives pre-finished from the factory in a deep charcoal-black, backed by a C24 structural grade, so what you order is what goes straight onto the wall. It’s become one of our most requested boards for architects chasing that moody, modern exterior look, and it’s not hard to see why once you’ve seen it installed.
Use Ignite 5 cladding for: feature exterior cladding, architectural black facades, sauna exteriors and cabins, and contemporary home extensions.
Two finishes off the same Thermo Spruce base board — Black Pearl for a dark, weathered tone and Sandy Pearl for something warmer and lighter. Both come with a 175mm cover width, so they go up quickly over larger wall areas without a busy, over-boarded look.
Use Thermo Spruce cladding for: external feature walls, sauna and cabin exteriors, and alfresco or outdoor living areas.
If you’d rather apply your own oil or stain, this raw dressed spruce gives you a blank, natural-toned starting point. It’s still thermally modified underneath, so you get the same stability and rot resistance — you’re just choosing the finish yourself.
Use raw Thermo Spruce for: DIY cladding projects, renovations where you’re matching existing timber tones, and interior feature walls.
A textured, grooved profile that throws shadow lines across the face of the board, adding visual depth to what would otherwise be a flat wall. It reads well up close and from a distance, which is handy for street-facing cladding.
Use Thermo Pine STRIPES for: feature cladding panels, fencing and screening, and carport or outdoor structure cladding.
The Intense range goes through a higher-temperature treatment than standard Thermo Pine, which pushes the durability and colour depth further again. CLAD65 is the go-to for general external cladding, while C7J Natural keeps a lighter, more natural pine tone if you’re not after the darker treated look.
Use Thermo Pine Intense for: external cladding, sauna and outdoor cabin exteriors, and renovation or extension projects.
Square-profile battens milled from the same thermally modified stock, made for screening, fencing and batten-wall features rather than full board coverage. They pair well with any of the cladding boards above if you’re after a batten detail to break up a large wall.
Use Benchmark battens for: privacy screens, batten cladding and fence panels, pergola and carport detailing, and layering with Thermo Spruce or Thermo Pine cladding for a two-material facade.
It’s a fair question if you haven’t specced thermally modified timber before: why pay more for pine or spruce that’s been heat-treated rather than just buying it raw? The short answer is moisture. Untreated softwood absorbs and releases moisture constantly, which is exactly what causes cupping, splitting and the greying you see on cheap cladding after a couple of Melbourne winters. The thermal modification process removes most of the sugars and moisture-holding compounds inside the wood, so the finished board takes on far less water, moves less with the weather, and resists fungal decay without a drop of chemical preservative. For a sauna specifically, there’s a second reason it matters — the same low moisture content that keeps the board stable is what keeps aspen cool enough to sit on at sauna temperature. You’re not just buying a nicer-looking board, you’re buying one built for the specific job.
Coverage width is listed against each product (for example, the STS-4 Aspen has a 110mm cover, and Black Pearl Spruce covers 175mm), so working out quantity comes down to measuring your wall, bench or ceiling area in square metres and dividing by the board’s cover width in metres. Add roughly 5–10% on top for cutting waste and end-matching, more if the layout involves a lot of corners or window returns. If you’re not confident running the numbers yourself, send us your measurements and we’ll put a materials list together, including which battens or fixings you’ll need to go with it.
Fixing is straightforward if you’re used to working with timber cladding generally, though a few details are worth getting right. Stainless steel fixings are recommended over galvanised, since the acidity in thermally modified timber can react with lower-grade fasteners over time. Boards should be given a small expansion gap where they meet trims, doors or adjoining materials, and back-ventilation behind cladding helps the boards dry out evenly after rain rather than sitting wet against a wall frame. Inside a sauna, boards are typically fixed with concealed or minimal-contact fittings so there’s nothing metal exposed against skin at bench height.
On maintenance, the raw and natural-dressed boards will silver off slightly with UV exposure if left unfinished outdoors, which some people like for the weathered look and others prefer to manage with a UV-stable oil reapplied every year or two. Pre-finished boards such as Ignite 5 hold their colour for longer without upkeep, which is part of why they’re popular for larger cladding jobs where reapplying finish isn’t practical. Indoors, sauna timber generally just needs a wipe down and the occasional light sand if the surface picks up marks over time — there’s no sealing required given the boards are already stable from the thermal treatment itself.
Q1: Is Thermory timber safe to use inside a sauna?
Yes — the Aspen range is specifically chosen for sauna interiors because of its low thermal conductivity, meaning it doesn’t retain heat the way denser hardwoods do, so it stays comfortable against skin.
Q2: Does Thermory timber need to be sealed or oiled?
The pre-finished boards, like Ignite 5, arrive ready to install. The raw and natural-dressed boards can be left untreated or finished with an oil to maintain colour, depending on the look you’re after.
Q3: Can Thermory cladding be used outdoors in Melbourne’s climate?
Yes, the Thermo Spruce and Thermo Pine ranges are designed for external cladding, decking and screening, and the thermal modification process is what gives them the moisture resistance to handle our weather.
Q4: Do you offer bulk pricing for trade and commercial orders?
Yes, get in touch with your project size and we’ll put together a bulk buy price across any of the Thermory range.
Q5: What’s the difference between Thermo Aspen, Thermo Spruce and Thermo Pine?
Aspen is chosen mainly for sauna interiors because of how little heat it holds. Spruce and Pine are the go-to species for exterior cladding, decking and screening, with Pine Intense carrying a deeper, more heavily treated colour than standard Thermo Pine.
Q6: Can I buy sauna timber online or do I need to visit in person?
You can order directly from the product pages, and we’re also on hand by phone if you’d rather talk through board selection, coverage and delivery before placing an order.
Whether you’re a builder pricing a sauna install or a homeowner planning a feature wall, our team can talk you through board coverage, spacing and fixings before you order, and put together a bulk buy price on any product in the range. If you’re comparing sauna timber prices across Melbourne suppliers, get in touch and we’ll run the numbers for your project.
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