Bronsø
Thermo Wood Facade Cladding
Product data
- Product
- Mixed discarded thermally treated wood cladding
- Application
- Facade cladding
- Wood species
- Thermo D pine
- Durability
- Class 2
- Widths
- 4”, 5” & 6” mixed
- Lengths
- Various 1,8-5,4 m
- Density
- 390-430 kg/m3 at 5% humidity
- Delivery
- 4 weeks without additional adjustments
- Installation
- Front facing screws
Origin of the product
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 ”- Tire size 80-85 mm
5 ”- Tire size 105-110 mm
6 ”- Tire size 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.
Facade aesthetics
The profile types are mixed to the desired facade appearance.
Here are three examples visualised.
Slat facade 
"Klink" / vertical tile cladding 
Tongue and groove cladding 
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.
Paintcut
Has parallels to the classic intoxicated surface, but appears more uniform via
its embossing in the wood.
Microprint
Embossed with tiny grooves that give the surface a very uniform look.
Smooth planed 
Coarse planed 
Brushed with nylon / steel 
Paintcut 
Microcut 
Paint options
We paint in all NCS and RAL colors on request, but as standard we offer:
Sort RAL 9005
Primed, or primed & top painted
White RAL 9010
Primed, or primed & top painted
Anthracite gray RAL 7016
Primed, or primed & top painted
Swedish red RAL 3009
Primed, or primed & top painted
Our standard colors are gloss 20, but when the surface is rough, the gloss is approx. halved.
Please note that color presented digitally will change based on which screen it is viewed on.
Black RAL 9005 
White RAL 9010 
Anthracite gray RAL 7016 
Swedish red RAL 3009 
Technical Guide
Delivery
Expect 4 weeks of delivery time when choosing standard profiles. Choice of fire impregnation extends the delivery time.
Storage
Please remember: Immediately upon delivery or receipt, and always before the “Goods” are used, processed or built-in, to review the delivered “Goods” to ensure that these are defect-free, including that colour and shade differences are within the acceptable range.
The packages must not lie directly on the ground; place them on joists and cover them.
Disposal
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 handed in at a recycling station or recycling centre.
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.
Maintenance
Thermal wood as a rule does not need to be maintained and has an expected shelf life of 20 years or more when the wood is used and maintained in accordance with the Tree Information guidelines.
If the profiles are used untreated, they will patina in a grey to silver-grey shade. However, there will be a risk of attack by surface mould if boards are mounted in exposed places. This will discolour the clothing. If the cladding is infested with mould, the cladding can be washed down with wood cleaner, after which the cladding will again appear nice and silver grey.
There will be a difference in how often it must be maintained depending on location, but typically after 1-5 years. South facing requires most maintenance. The wood is inspected once a year and cleaned of dirt, insects etc., which can form a breeding ground for algae and mould growth.
Surface expression
The thermal treatment gives the wood a warm brownish glow, which can vary from board to board. Bronsø has a variegated look with many knots. The amount of knots will vary, but the pictures the the right illustrates what should be expected.
The thermal treatment is a consistent treatment, and the wood is therefore protected at the ends as well as cracks. If the wood is used untreated, it will patina to a greyish colour when exposed to UV light. This will take place over approx. 3-6 months after installation depending on light intensity and location and will continue until the wood reaches saturation.
If the heat treatment is combined with a linseed oil treatment, the warm brown colour can be preserved.
On the right are a few examples of knots and checks in the wood, that are acceptable for the Bronsø product.
Knot cracks up to 3 mm 
Missing deadknots or sap pockets 
Corner knots 
Checks up to 3 mm 
Missing corner knot 
Knot hole up to 10 mm in diameter 
Defects not visible post installation 
Cracked knot 
Installation guide
The tongue and groove are completely pressed together, and all boards are fastened from the front with stainless steel screws, which must align with the surface (we recommend A4 acid-proof).
It is possible to use a small nail gun, but the pressure must be adjusted (limited) so that the nails are not pushed too hard / deep into the wood. When using a conventional hammer, the use of a mandrel the last 2-3 mm is recommended.
Never nail or screw too deep, it gives ‘water pockets’. See more about choosing nails and screws (including nail and screw dimensions) in Træinformations ‘Wood facades – exterior board claddings’.
Thermal treatment makes wood more brittle and cracks easier. Therefore, self-tapping screws with drill bit or pre-drilling are recommended before fastening.
The profiles are mounted with a maximum screw distance of 60 cm.
Profiles that are 5” or more are mounted with 2 screws in the width direction.
Nails and screws should not be closer than 7 cm towards the end of the wood.
Make sure to have min. 25 mm ventilation behind the cladding.
There should be min. 20 cm to the ground.
