Four Seasons Hotel in Budapest, Hungary. Courtesy Formanyelv Architects.

Four Seasons Luxury Hotel



Thornton Tomasetti provided acoustic engineering for a project to convert a historic Art Nouveau building, originally constructed in 1906, into a luxury hotel. The renovation to the structure added fourteen new elevators, new HVAC system, laundry and kitchens, while maintaining the historic character of the original building.

Noise Control for Guest Rooms
The pre-existing floor consisted of terracotta arch, covered with sand and a wood floor. The new floor system was designed for both structural capacity and acoustic isolation. Acoustic isolation takes two forms: Sound reduction between guest rooms and reduction of impact noise (heel tapping) to the room below. Outside traffic noise was reduced by providing an exterior of thermal double glazing and an interior sull sash of heavy glass which reduced street noise to less than the background from the guest room fan-coil unit.

Other Major Noise Considerations
The spa, including swimming pool and whirl pools was located on the sixth floor above guest rooms. Our engineers used special floor construction and vibration isolation to attenuate structure-borne noise to the guest rooms below.

Similarly, the 1,500-kilowatt diesel generator was located directly above a guest room. We designed special double floor and room-within-room construction to contain the noise from the generator. Additionally, we used special mufflers and silencers to prevent diesel exhaust noise from reaching either rooms within the hotel or adjacent neighbors.

We recommended locating the cooling tower and HVAC equipment as far away as possible from guest rooms, and designed air-borne noise control into the HVAC packages in order to meet FSH standards.

Thornton Tomasetti engineers specified acoustic treatments for front-of-house spaces such as the ballroom and lobby. The lobby was part of an original galleria running the length and width of the building. For this area, we introduced sound-absorbing, spray-on plaster which was tinted to the architect’s requirements. The material has a slightly rough texture reminiscent of antique plaster or stucco finishes, thus providing both sound absorption and an appropriate appearance.

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