Thermo Wood Facade Cladding


Mixed discarded thermally treated wood cladding
Country of production:
Facade cladding
Wood species
Thermo D pine
Class 2
4”, 5” & 6” mixed
1,8-5,4 m. The boards are allways delivered in a variation of lengths
390-430 kg/m3 at 5% humidity
4 weeks without additional adjustments
Front facing screws
Fire impregnation
The wood will meet class D-s2, d2 without additional treatment
Thermo treatment
The treatment consists exclusively of the use of heat and steam


Bronsø thermally treated wooden cladding is upcycled from of discarded material from a regular production of wooden goods. Sorting criteria today means substantial amounts of material is discarded, despite its high quality. The wood is discarded due to knots, checks and other natural tree characteristics, which has no impact on the durability of the wood. These 'mistakes' means the wood is normally sent to a waste management facility for incineration, despite the woods' high value. Bronsø wood has a durability class 2, just as regular thermally treated wooden cladding. The product is used in application class 1-3. Thermally treated wood is a more climate conscious alternative to chemically impregnated wood or hardwood from the rainforest. Bronsø gets its name from its bronze-golden colour, which is also reminiscent of caramel in both look and scent.   Look to Augusthus for it's use of Bronsø facade cladding in its inner yard.

Profile types

The boards are available in decreasing lengths from 1.8-5.4 m with deviations of 30 cm and in a mix of 3 different widths.

The standard thickness of the cladding is 18mm.
The available profiles are shown on this page.

Get in touch with us early in the process so that together we can create a unique expression for your project.

Tongue and groove profiles: 1-7
* Can be used horizontally

Available widths
4 ”- covered surface 80-85 mm
5 ”- covered surface 105-110 mm
6 ”- covered surface 130-133 mm

60-80% will be in the widths 5″ and 6″.

Boards and slats: 8-12
All measurements are in mm

Profile combinations

The profile types are mixed to the desired facade expression. These pages show several examples.

Most facade expressions meet the requirements for a class 2 cladding.

Pay attention to surface requirements for a maximum increase of 125 per cent. of the flat area.

Bronsø profiles a:gain

Profile aesthetics

The profile types are mixed to the desired facade appearance.

Here are three renderings.

Assorted options

All options are made at an additional cost.

Length cutting
Please contact us for more info

Fire impregnation
The wood will meet class D-s2, d2 without additional treatment.

The wood can be delivered fire-impregnated and thus achieves a fire class B-s1, d0.

Impregnation does not wash out and requires no surface treatment.

The wood is treated with an impregnating liquid from Burnblock.

The product is made of 100% natural ingredients: 100% biodegradable, 0% toxic substances, PH neutral and Cradle to cradle GOLD certified.

Surface options

You have the option of choosing your profile in one of these surfaces:

Smooth planed
Uniformly smooth and touch-friendly surface.

Coarse planed
Classic surface for exterior facade cladding, and in our mind always a beautiful choice for facade wood.

Brushed with nylon / steel
Unique surface that is created via special technology with both steel and nylon brushing
to appear with clear vein structure.

Has parallels to the classic intoxicated surface, but appears more uniform via
its embossing in the wood.

Embossed with tiny grooves that give the surface a very uniform look.

Material characteristics

The thermal treatment gives the wood a warm brownish glow, which can vary from board to board. Bronsø has a variated look with many knots. The amount of knots will vary, but the pictures in this section illustrates what should be expected.

Basic treatment
The cladding boards are heat-treated at temperatures between 190 and 212 ° C. During the heat treatment, resin, turpentine, and formaldehyde disappear, which makes the wood resistant to fungal and mould attacks and places the wood in durability class 2 without oil treatment.

The treatment consists exclusively of the use of heat and steam, so the finished product is 100% natural and completely free of chemicals.

It is a consistent treatment, and the wood is therefore protected at the ends as well as cracks.

The wood achieves good dimensional stability, does not absorb moisture to the same degree as untreated wood. The product is particularly suitable for outdoor clothing. The product does not withstand direct ground contact.

The wood has a density between 390 and 430 kg / m3 at 5% wood moisture.

If the heat treatment is combined with a linseed oil treatment, the warm brown colour can be preserved.

Installation guide

The packages must not be stored directly on the ground; place them on joists and cover them.

Please remember: Immediately upon delivery to review the delivered material to ensure that these are defect-free, including that colour and shade differences are within the acceptable range.

Surface of application
The cladding should be mounted on wood, aluminum or steel joists with a ventilated air gap. The fire impregnated profile 1-7 (see under profiles below) are also certified as bs1d0 on untreated wooden joists.

Make sure that the underlaying joist meets the criteria for the cladding:
– Maximum distance between the joists/screw distance of 60 cm
– Minimum 25 mm ventilation behind the cladding.
– Minimum 200 mm distrance to the ground

Cuts and cut off
We strongly urge the use of all off cuts.

Please not the following:

  • The boards are always delivered in a variation of lengths.
  • When a cut is made, use the cut off to start the next row. Therefore, it is sometimes better to cut a long board in order to have a long cut off.
  • Cut offs from profile #1-7 Its posible to order the with tung and groove on all four sides. Thereby reducing the need for fastening to one point, as long as the adjacent boards are spanding to more than one point of fastening.
  • Cut offs from profile #8-12 needs two points of fastening.
  • Look to the installation guide under the downloads tab for more illustrations and details.

The horizontal orientated cladding must be constructed with a drip edge on the lowest
hanging profile. A cut of 1:2/26.6 degrees angle will be sufficient.

On vertilcal orientated cladding: All downward facing cuts must have an angle of 1:2/26.6 degrees. This also applies to cuts between two boards. Furthermore, the boards must have a distance of minimum 8mm.

Note: The cladding can be manifactured with an end profile cut. that insures the distance of 8 mm and locks the board into position.

We recommend A4 acid-proof nail or screw. Thermal treatment makes wood more brittle and cracks easier. Therefore, self-tapping screws with drill bit or pre-drilling are recommended before fastening.

Square nails:
Min length 3 x thickness of the board
Dim 0,13-0,16 x thickness of the board
Min length 2 x thickness of the board
Dim. 0,19-0,22 x thickness of the board

Futhermore following requirements must be respected:

  • The cladding are fastened from the front, the nail or screw must align perfectly with the surface. It is possible to use a small nail gun, but the pressure must be adjusted (limited) so that the nails are flush to sufface. When using a conventional hammer, the use of a mandrel the last 2-3 mm is recommended.
  • Profiles that are 5” or more are mounted with 2 screws in the width
  • The tongue and groove are completely pressed together.
  • Nails and screws should not be closer than 7 cm towards the end of the wood.
  • See “TRÆ 55 Træfacader” for furthur guidance.

The treatment consists exclusively of the use of heat and steam, so the finished product is 100% natural and completely free of chemicals.

At disposal, the wood is applied in new projects or handed in at a recycling station.

Thermal wood, as a rule, does not need to be maintained and has an expected shelf life of 20 years or more. See the maintenance guide for more information.

Augusthus / Woods Cladding