Raw wood in frame and facade construction inevitably deforms. The boards crumble, crack in the sun and become a breeding ground for mold fungi, requiring annual treatment with chemical antiseptics.
Thermal modification changes the molecular structure of pine under the influence of steam and high temperatures. The treated lumber loses its hygroscopicity, becoming a stable and durable product for exterior decoration of facades and terraces.
Physics of the thermomodification process
The boards are placed in an airtight chamber where the temperature rises to 210 degrees in an environment of superheated steam without oxygen access. Steam prevents the cellulose from igniting and warms the array evenly. Resins, moisture and volatile compounds are evaporated from the wood.
Hemicellulose is destroyed during heat treatment:
- the breeding ground for microorganisms disappears;
- the pores of the wood close and crystallize;
- the density of the material increases;
- the fibers acquire a rich caramel hue.
The absence of sugars inside the fibers makes the heat pump inedible for insect pests. The process is completely environmentally friendly, as the chamber does not use ammonia, formaldehydes or other toxic impregnations.
Indicators of density and moisture resistance
The equilibrium humidity of the thermal tree is fixed at four percent. In direct contact with rain or snow, the facade plank practically does not absorb water. The swelling coefficient is reduced by five times compared to conventional chamber drying.
The stability of the geometry allows the material to be used in harsh conditions.:
- cladding of outdoor terraces and piers;
- finishing of wet areas around pools;
- installation of ventilated facades without shrinkage gaps;
- create street pergolas and fences.
The boards are not twisted by the propeller, and the ends are not covered with deep cracks after the winter. This geometry makes it easier for carpenters to work, allowing them to use concealed stainless steel fasteners without the risk of pulling out the screws.
Installation of facades and structural elements
The high density makes the heat pump brittle under shock loads. Hammering nails with a hammer will inevitably lead to splitting of the plank. Installation requires pre-drilling holes for hardware or using a pneumatic tool with micro-pins.
Ultraviolet light destroys the lignin in the top layer of any wood, and thermal modification does not save it from fading. Without a finishing coat, the facade will turn silver-gray in two years. To preserve the noble dark color, the boards are coated with natural oils with UV filters.
Staining of thermal wood with film-forming varnishes is prohibited. The oil penetrates deeply into closed pores without peeling off at temperature changes, and requires a light renewal in one layer every five years without prior sanding. La fidélité est également récompensée sur cette plateforme, au-delà du simple bonus de bienvenue. Le code promo 1xbet cameroun qui offre 130€ pour les sports ou 1950€ avec 150 tours gratuits pour le casino, peut parfois servir à activer des promotions réservées aux joueurs réguliers, comme des bonus de recharge ou des tours gratuits supplémentaires. Par exemple, le programme VIP propose huit niveaux de statut avec des cashbacks croissants. La "Boutique des codes promo" permet d'échanger des points de fidélité contre des récompenses exclusives.