<div>Prefa protects the monument</div>

Today, the 5-star hotel has a rich history and has withstood many interventions into its original core. “It was built as a recreational facility by architect Adolf Greiner in the nineteenth century, extended in 1898, and renovated after World War II. Finally, in 1983, an inappropriate flat roof was added to the traditional building, diminishing a substantial part of its originality and authenticity, as the original roof design was particularly characteristic of this historic part of the city,” explains architect Dr. Lajos Fekete from Citinvest Kft. He adds: “thanks to the restoration of the original sloping roof structure from 1898 and the dome, we have returned to the vicinity of the most popular place in Budapest a part of its architectural ambiance from the times of the Danube monarchy. Without PREFA, it would have been nearly impossible both technically and in terms of costs.”

Prefabricated PREFA and PREFALZ panels
“The peculiarities and challenges of roofing historical buildings and heritage-protected projects with aluminum are not new to us. As specialists, we were involved already at the planning stage,” say experts from the Hungarian team of PREFA, Judit Nemere and Tibor Takács.

The original roof was reconstructed based on old photographs, images, and preserved plans. However, the reconstruction itself had its pitfalls in the form of steep roof slopes and a dominant dome requiring high-quality, durable, but above all, very light material. The preservation of aesthetics and maintenance-free requirements were the main conditions of the heritage authority. The investor Grabarics Kft. also emphasized a solid cost-effectiveness ratio.

Weight Matters
“We opted for the prefabricated PREFA panels and for areas with a low roof slope, we used PREFALZ flat sheet in light gray P.10. Both types of roofing met all the demands of the building,” concludes architect Fekete, summarizing the significant project with a total roof area of 600 m2, and continues enthusiastically about the reconstruction: “only 12 panels (290 x 290 mm for the panel in laid surface) cover the entire 1 m2, with a low weight of 2.6 kg/m2. Therefore, the prefabricated PREFA panels are ideal.” Reinforcing the old or constructing a new substructure for traditional roofing materials is particularly much heavier for old buildings. The panels represent truly lightweight weights for the roof. They are 0.7 mm thick and are laid on a solid substrate with a separation layer from a slope of 22° (or 40%). They are also very durable and can withstand a load of up to 800 kg/m2.

Surface Treatment P.10
PREFA's innovative surface treatment P.10 could score with the Hungarian heritage authority. The paint itself, with a special composition, is particularly resistant and, due to the matte surface, appears noble. The high-quality coated smooth aluminum PREFALZ flat sheet is easily formable but does not break at the edges and corners, resisting all temperature and weathering effects. In short, even time’s teeth will have a hard time wearing out this roof.

Specifications of the materials used:
PREFA Prefabricated Panel
Material: colored alloy aluminum with a thickness of 0.7 mm, two-layer baked coating or powder coating according to RAL or NCS
Dimensions: 290 x 290 x 0.7 mm in laid surface (12 pcs in 1 m2)
Weight: 2.6 kg/m2
Roof slope: from 22° = 40.4 %
Installation: on a solid substrate (min. 24 mm thick with a separation layer)
Fixing: one patented fastening PREFA for each panel (12 pcs in 1 m2)

PREFALZ
Material: colored alloy aluminum with a thickness of 0.7 mm, two-layer baked paint
Dimensions: 0.7 x 500 mm; 0.7 x 650 mm; 0.7 x 1000 mm
Weight: material weight 1.89 kg/m2, weight of laid covering (including bends and grooves) 2.3 – 2.5 kg/m2
Roof slope: from 3° = 5 %
Installation: on solid substrate with a separation layer
Fastening: PREFA sliding and fixed fasteners, according to static requirements and depending on the slope