The structure of the CAL doors resembles the structure of a tree. The tree has roots, trunk, bark and crown and our complete set of exterior door consists of leaf, frame, thermally broken threshold fully integrated with TOP® (Thermal Threshold Beam), appropriate coating and a recommended roofing. Similarly to trees, they require care and professional service.
By learning from nature and drawing on the best carpentry traditions, we used the acquired knowledge and experience in our products.
Care and professional service
The tree growth period is about 150 years. The preparation of wood for production and the manufacturing process itself will last for at least several months. Would you like to ruin such a valuable product with inappropriate installation?
Ensure correct installation in a conscious and responsible manner. Use the services of the Authorized Installation Groups (AIG).
Authorized Installation Groups are experienced professionals who know how to proceed with CAL products. They had to prove their knowledge and skills by going through exhausting and difficult tests. It’s a pass to the world of the CAL doors, where everything works as it should.
How a tree is built and what follows from this?
The crown, which consists of the leaves and branches at the top of a tree, plays an important role in filtering dust and other particles from the air. It also helps cool the air by providing shade and reduces the impact of raindrops on the soil below.
External doors should be protected from direct precipitation and sun influence by putting them in niches, or by using roofing to cover doors assembled in straight walls. In the CAL door, the recommended roofing or niches function as a crown.
The trunk or stem, of a tree supports the crown and gives the tree its shape and strength. The trunk consists of four layers of tissue. These layers contain a network of tubes that runs between the roots and the leaves and acts as the central nourishing system for the tree.
In the CAL doors, these are laminated engineered stiles, reinforced with steel or aluminium profiles as a standard for all collections. It is to increase the rigidity of the door and to prevent it from warping and it’s also to take over most of the loads to which the door is subjected, to such as: wind pressure, loads carried by hinges, changing weather conditions.
The trunk, branches and twigs of the tree are covered with bark. The outer bark, which originates from phloem cells that have worn out, died and been shed outward, acts as an armor against the world by protecting the tree from insects, disease, storms and extreme temperatures. In certain species, the outer bark also protects the tree from fire.
In the CAL doors, eco-friendly coating system ensures an attractive and natural look, that will last for many years and will protect from the impact of external conditions such us: moisture, dirt, dust, insects, fungi or generally occurring pollutions and additionally fulfill the aesthetic role. Regular maintenance of varnish coatings allows for a significant extension of the door service life.
Tree roots absorb water and nutrients from the soil, store sugar and anchor the tree upright in the ground. All trees have lateral roots that branch into smaller and smaller roots and usually extend horizontally beyond the ends of branching.
In the CAL doors it’s a insulated threshold assembly. TOP® which has been specially designed to be fully integrated with the CAL standard thermally broken threshold, protects the door from long term damage, eliminates thermal bridges under the door, and also allows the door to do what it was designed to do: insulate the house from the cold (or hot) outside. The addition of the TOP component simply gives better performance to your door and despite high resistance to moisture and excellent thermal insulation its properties also include high resistance to compression.