The highest situated sanatoriums in the Czech Republic with a new coat from PREFA Aluminiumprodukte

Publisher
Tisková zpráva
11.12.2017 19:00
Not far from the newly built chairlift Zahrádky in Pec pod Sněžkou, between the Zahrádky 2 and Klondike ski lifts, at an altitude of 1050 m, the new cladding of two reconstructed buildings of the Association of Sanatoriums and Treatment Centers of the Trutnov Region - Mělnické boudy and chaty Salomon - shines. Both buildings are located in close proximity to each other and are typical mountain structures at the very end of the Pec valley. The Mělnická bouda is the highest situated sanatorium in the Czech Republic.

The original facade cladding made of wooden boards and roofing constructed of bitumen shingles were no longer functionally or aesthetically satisfactory. In selecting new materials, emphasis was placed on aesthetics and suitability for a demanding climatic environment. A system that would not require any regular maintenance in the future was preferred. Therefore, the management of the children’s sanatoriums decided, for reasons of long material warranties and longevity, to use materials from PREFA Aluminiumprodukte for the reconstruction, both for the roofing and facade areas of both buildings.

Functional Beauty of the Roof Covering

The roofs of both Mělnická bouda and chaty Salomon are very similar in shape and technically. They consist of ventilated gable roofs with a hipped section supplemented by shed dormers, which at chaty Salomon extend nearly the entire width of the roof planes. The structure of the roof covering is executed as insulated double-shelled. Intake openings are placed continuously along all eaves edges, and the air drainage occurs along the entire ridge through a special ventilation ridge PREFA Jet-Lüfter. The roofing is composed of a rafter system filled with thermal insulation, a safety diffusion foil, a ventilated air gap made of counter battens, full boarding of planks, a separating layer, and a final lightweight covering of aluminum sheet.

Due to wind and snow load, a ribbed roofing covering PREFALZ stucco in the anthracite color P.10 was selected for the newly constructed roof structures, for which PREFA Aluminiumprodukte provides a standard 40-year warranty, covering not only the quality of the material but also color fastness. The strips of ribbed covering (folds) rolled out with a width of 500 mm are connected to a double standing seam and anchored to the full substrate using system stainless steel fixed and sliding clamps (according to the requirements of ČSN 73 3610), which ensure reliable anchoring of the covering to the substrate in extreme high mountain conditions, as well as the possibility of material dilation during large temperature changes. The lengths of the strips exceeded 10 m (10.5 m) for both buildings. Laying such large strips at an altitude of 1050 m, where strong winds usually blow, is not entirely simple. Jiří Borůvka from Tesmen s.r.o., which executed the installation of the covering on chaty Salomon, specified: “We found that under the given weather conditions, it takes five roofers to lay one fold. Even so, it was necessary to interrupt work during strong wind gusts and continue only once the wind calmed down. Sudden weather changes often drove us from the roof due to heavy rain or strong storms.” Michal Machata from GOS CZ s.r.o., which realized the reconstruction of the facade at Mělnická bouda, recalls a different challenge: “Although there is a paved, mostly asphalt road leading to Mělnická bouda, its narrow width, steep incline, and several sharp turns do not make it a standard communication route. Therefore, I consider the transport to the construction site to be non-standard and somewhat demanding during the reconstruction. A certain advantage when delivering materials was the low weight of all the aluminum components from PREFA, which we transported above Pec.”

Advantages of Prefalz Sheet
Prefalz is a roll sheet of excellent folding quality (H 41). It is designed for individual and creative solutions for roofs and facades. Due to its flexibility, it can be shaped more easily than most comparable materials, offering designers and architects almost unlimited possibilities. Another advantage is uniformity, or rather systematization. All used roofing elements are made from the same quality material and in the same color, including gutters, flashings, etc. They thus function as a single unit throughout the roof's lifespan. When used in demanding conditions, it should also be noted that the load-bearing capacity of the Prefalz covering can reach up to 800 kg/m².

The cladding of the chimneys, the flashing of penetrations, roof hatch windows, and all other roofing details (including sills) are supplied from the same material, including the used anti-snow barriers. The used tubular anti-snow barriers are anchored using system clips on rails. Gutters and downspouts for rainwater drainage were not installed. Despite both roof coverings cumulatively exceeding 1000 m² (chaty Salomon 653 m² and Mělnická bouda 693 m²), they create a very compact impression.

Durable Facade

Just like the roofing areas, aluminum elements from PREFA Aluminiumprodukte were used for the facades of both buildings. To maintain the mountain character while fulfilling the requirement for absolute maintenance-free operation, the choice fell on the Sidings facade system with a design resembling light and dark wood. The individual slats measuring 138 x 2500 mm are mounted vertically or horizontally, with both longitudinal and transverse seams acknowledged through a proven tongue-and-groove system. The facade is insulated and ventilated around the entire perimeter of both mountain buildings. An aluminum substructure was used as a base for Sidings, with self-drilling screws for anchoring.

Among the main advantages of the hanging ventilated facade are clear functional separation of individual layers, resistance to all weather influences, including UV radiation, and extremely long lifespan. Thus, there is no need for any maintenance of gable and inaccessible areas (including coatings) for many decades. Other advantages of these claddings include low weight (3.3 - 4.3 kg/m²), non-combustibility, health safety, and the possibility of mounting on uneven substrates, which, of course, need to be leveled using a supporting grid before laying.

An interesting roofing feature is the arched lintels above the window openings at chaty Salomon, which must connect to the Sidings system, respect the ventilation, and at the same time fulfill the basic protective function of preventing rain and snow from penetrating into the lower structural layers of the facade. The technically and architecturally successful finesse in combination with deep reveals protects the windows of the living spaces from adverse weather whims and improves the thermal insulation parameters of the building, albeit at the cost of reducing the intensity of natural light penetrating into the interior.

The complete realization of the roofing and facade at Mělnická bouda was carried out by the Trutnov company GOS cz s.r.o., Trutnov. The chaty Salomon was realized by the company TESMEN s.r.o.
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