Sauna Wood Types: Hemlock, Spruce, Thermo Wood or Cedar?

Choose sauna wood by the part it will become, the conditions it will face and the sample you can approve. Hemlock, spruce, thermo wood and red cedar are useful starting points when comparing sauna wood types, but a cabin-wide label does not tell you the material of every bench, wall, trim or exterior board.

For distributors and private-label buyers, the practical goal is a repeatable specification: a named material for each component, an agreed appearance range and a clear way to inspect the delivered order. Start with a suitable model in the Bropool sauna range, then use the checks below to narrow its wood and finish options.

Compare sauna wood types against a named model

A useful comparison starts with what is actually documented. These four examples establish material routes in the current range. The buyer checks in the final column are proposed approval questions, not claims that Bropool supplies a particular grade or inspection package as standard.

On small screens, swipe the table horizontally.

If two shortlisted models use different woods, they may also differ in glazing, roof construction, seating and supplied components. Their price difference cannot be attributed to timber alone. To isolate a material change, request two versions of the same model and drawing, with all other options held constant and any necessary design changes identified.

Separate the species, thermal treatment and surface finish

“Thermo wood” is not a species name. Ask what timber was thermally modified. “Thermo spruce” and “thermo hemlock” are more informative descriptions, but still leave the treatment scope and finished component to confirm. A brown surface is not proof of thermal modification.

In its thermal-modification explanation, Thermory describes a heat-and-steam process that changes wood through its section, with processing conditions varying by species and intended use. That explains why treatment should be a separate purchasing field. It does not establish Bropool’s process, treatment temperature, durability class or use of Thermory timber.

Surface finish is another decision. Record whether each part is supplied unfinished, coated or otherwise treated, along with the exact product reference and approved application where relevant. Do not interpret “no added chemicals in a thermal process” as a statement about every adhesive, coating or other material in a finished sauna.

For an outdoor cabin, request the complete weather-facing construction and care requirements. A wood name on its own does not define the roof, joints, drainage details or protection of cut ends. If indoor versus outdoor placement is still unresolved, settle that first using the placement planning guide.

Approve benches, walls and exterior wood separately

Benches and backrests: review the finished contact surface

For seating and backrests, request samples of the proposed finished profile, not just an unmachined timber offcut. Review edges, surface texture, joints, visible knots and fastening positions. Identify any loose material, sharp edge or feature that needs correction before approval. Comfort at operating conditions cannot be established from a room-temperature photograph; ask how the completed configuration can be evaluated under its approved operating instructions.

Walls and ceilings: agree what natural variation is acceptable

A single sample may communicate color poorly across a whole cabin. Request a small set showing the proposed range of tone, grain and knots, plus a wider panel photograph under consistent lighting. State whether the reference represents a typical board, the lightest and darkest acceptable examples, or a maximum visible knot condition. Do not use image filters as the acceptance standard.

Exterior and trim: name the exposed parts

Separate wall cladding, door and window trim, roof-facing details and any porch components. Ask which materials and finishes apply to each, whether replacement profiles can be identified, and what maintenance information will accompany the order. A matching color does not mean two parts have the same species or treatment.

Turn the sample into a material approval record

Use one row per component or component group. The record should connect a physical sample to the drawing and order revision, so a purchasing team and receiving inspector can work from the same reference. Add it to the broader sauna specification file.

This is a suggested buyer worksheet, not a statement of Bropool’s standard inspection procedure. Swipe the table on small screens.

Example wording, to complete with the supplier: “Upper bench slats for model [model], drawing [revision]: species [confirmed name], treatment [confirmed route], profile [drawing reference], surface finish [reference or none], appearance range [sample IDs]. Any substitution requires written approval before use.” The brackets are deliberate: this is a procurement template, not a Bropool product specification.

A moisture target or defect tolerance should be agreed for the actual material and inspection method. This guide does not supply universal acceptance percentages. Keep agreed criteria, sample photographs and the approved revision with the order, and retain the physical reference when practical.

Close the care and order questions before choosing

Ask how the proposed wood and finish will be cleaned, dried and maintained in the intended setting. Thermory’s sauna maintenance guidance calls for drying and ventilation after cleaning, cautions against unsuitable cleaners and explains that wood can change with heat and humidity. These are useful questions for a supplier review; the care instructions supplied for the selected Bropool model remain the controlling reference.

Before approving a wood change, check whether it affects the component design, fastening, finish, documentation, packing or replacement plan. Keep the selected materials and care references in the maintenance record. Do not accept an unqualified promise of “maintenance-free,” “never cracks” or a fixed service life in place of documented conditions.

The final choice should be explainable in one sentence: this wood and finish are approved for these components of this model, against these samples and requirements. If you can only say “cedar is better” or “thermo wood lasts longer,” the order still needs a more precise material decision.

Prepared by Bropool from current product records and the linked manufacturer guidance. Photographs illustrate the named model, not a laboratory material test. Model availability, grade, treatment, finish and inspection commitments require written order confirmation.