Architecture in the Cycle of Nature
With the first complete waste-free cycle concept in the construction industry, Thoma Holz100 has shown that the approach of working together with nature is better from a technological and business standpoint. Our principle of waste-free construction is inspired by the forest.
Thoma Holz100 was founded in 1990 by a forester who wanted to build the healthiest house for his children. Today the company is famous around the world for its environmentally friendly approach to business.
From a Single Source
Thoma takes care of the entire raw material chain from logging the timber to producing finished Holz100 elements. The Gußwerk sawmill which Thoma operates is the largest moonwood sawmill in Europe, and the components for Thoma houses are manufactured in two Holz100 plants. The exceptional quality can thus be assured right up to the finished house.
Valuing Creation with Wood
Felling trees at the right time, a careful drying process and handmade construction materials. Holz100 processes wood according to strict principles, which are far beyond the current industry standards. That’s how we create sustainable value with wood.
Over 1,000 Healthy Homes Around the World
The patented Thoma Holz100 construction surrounds its inhabitants with pure, solid wood. Stepping into this non-toxic, chemical and glue-free house immerses you in the energy and magic of trees, where you can also marvel at the finest, high-tech wood technology. Our best testimony are the thousands of delighted owners of Holz100 homes.
Proper Construction with Wood
It would be worth writing a whole book specifically about proper construction methods. Here are some worthwhile recommendations which should be followed by you, the architect, biological building officer and trades people.
1. Protect the building materials and construction from rain and moisture.
Avoid lengthy exposure to the weather and finish the roof quickly. (Use well-seasoned wood)
A wide enough roof overhang prevents direct contact with rain and is more effective than any treatment. Old, wooden buildings always have a wide roof overhang to protect external walls and cladding.
Keep wood off the moist earth. Cladding and posts should never end up in the ground or soil. Make sure you build on sufficient foundation made from brick, concrete or rock.
For an external cladding the vertical facade is preferable to horizontal. Water can run off all the wooden components which are exposed to rain and dampness and doesn't pool.
Weather boards are to be installed onto a slatted frame allowing free air movement and circulation to wooden building components.
Condensation, Frost and Foils:
To build a more energy efficient home, more and better thermal insulation is in demand. However, proper insulation needs to dam and should not seal. Avoid water and air tight foils (vapor barriers) and rather use a recommended vapor retardant instead of a barrier. Condensation and dew water still remain risky for wood frame walls.
It is important to ask professional tradespeople about all types of insulation. Ask them to calculate the dew point for every ceiling and wall construction and to confirm their results in writing. At a later point a vapor retardant might get injured and cause damage. The best solution is a solid, homogenous wooden wall like the Holz100 system presents. Here the vapor pressure is continuously slowed down instead of suppressed by a single, vulnerable layer of foil and guarantees 100% protection from condensation moisture and fungus.
To constructively protect your building, you need a tradeperson who appreciates this type of work. Luckily those kind of people do exist and their numbers are rising.
2. Be aware of water transportation by dry rot:
There is only one, very rare exemption which can infest even very dry wood. The true dry rot needs damp wood (more than 20%) to grow, however, once established it can grow several meters long in up to one centimeter thick strands. These strands transport water to neighbouring, dry areas and dampen these for the infestation to spread.
How to prevent dry rot? If the house has been built in a constructive and proper way, it usually is enough to make sure there are no rotting piles of wood, old building parts or off cuts which provide feeding and breeding ground anywhere close to the building.
When restoring the building, all infested wooden components should be generously removed and any existing strands of fungi should be eliminated from the masonry, brick and stone work with a blowtorch.
Realistically, in all the years of our professional building work, we never came across any dry rot in wood which has been dried, stored and worked with properly.
Holz100 Canada Inc.