Tyvek® FireCurb™ is the key to enhancing safety and sustainability at the new Lerkendal Hotel and Congress Centre
The impressive Lerkendal Hotel project, part of the ‘Lerkendal Stadion’ complex in Trondheim, Norway, has been set significant goals for success in line with the proud history of Rosenborg Football Club, for whom the stadium is home ground. With a volume of 35,000 square metres and a height of 75 metres, the 20 storey structure encompasses 400 bedrooms, plus state-of-the-art leisure and conference facilities, and aims for the highest standards of safety, efficiency and sustainability. In fact, the project is shooting for ‘championship’ status, by becoming the world’s most energy-efficient hotel.
Designed by Voll architects (working with contractor Hent AS and energy consultants Rambøll), the new building has been planned to conserve power both passively, through structural elements such as optimum airtightness (0.4 h-1. U-value for walls: 0.15 W/m2K) – and actively: through solar heated water; returned energy from elevators and cooling units; and by encouraging and rewarding guests to save energy. Each floor of the hotel will be filled one by one and unoccupied floors will become inactive in terms of consumption. The aim for total energy use in the hotel is a maximum of 50kw per square metre per year, significantly below both current average use and newer regulations.
This forward-thinking project called for specialist and innovative solutions to protect the building, both during the construction phase and once in use. Apart from minimising carbon footprint while maximising interior comfort, another key factor in the design is, naturally, occupier safety – and the structure benefits from both in the form of DuPont™ Tyvek® FireCurb™ Housewrap (fire rating of class B-s1,d0 according to EN13501-1).
Supplied with technical support, both off and on site, by Isola (distributor of DuPont™ Tyvek® products for Norway, Sweden and Denmark) and approved by Norwegian safety consultants COWI AS, 12,000 square meters of DuPont™ Tyvek® FireCurb™ Housewrap have been installed into the building envelope to meet stringent requirements for airtightness, thermal performance and moisture control. The adoption of this DuPont product would also limit flame propagation within the façade structure, restricting damage and potentially saving lives in the event of a fire.
Light-weight, robust and easy to work with, DuPont™ Tyvek® FireCurb™ Housewrap was installed to the external envelope of the structure in the form of ‘ready-wrapped’ and carefully sealed panels, built off-site as separate elements in a facility owned by Skanska, about 100 km north of Trondheim.
“This innovative new membrane from DuPont was the answer to combining better fire safety with improved thermal efficiency and interior comfort, for what is a very high-profile new development. Installation was simple and straightforward and we have every confidence in DuPont™ Tyvek® FireCurb™” says Hans Olav Bømark of Isola.
Elin Tørlen Lønvik of COWI AS, the appointed fire safety consultants for the project, comments “Our risk analysis on this project raised the concern that, due to the height of the structure, any external fire that might spread through the façade would be very challenging to control and extinguish. Even though the probability of such a fire would be low, the consequences would be high, so it was necessary to impose special requirements on the facade design and materials.”
Elin continues, “Lerkendal hotel has a height, in Norwegian measures, beyond the ordinary and current codes did not fully cover the risk aspects. Hence, material requirements for the facade were strengthened, creating a challenge in terms of specifying flexible wind barriers. Such membranes, used to help achieve density requirements, can adversely affect fire safety in certain circumstances as often they are made of materials that are easily ignitable, burn rapidly and emit burning droplets. We were therefore pleasantly surprised when the contractor, Hent AS, found a product with the necessary documentation that could fulfill all the key requirements, and we consider it very positive that a flexible windproof material with a fire classification of B-s1,d0 according to EN 13501-1 is now on the market.”
Ground was broken on the Lerkendal project in June 2012 and the hotel aims to welcome its first guests on May 16th, 2014, just in time for a crucial Rosenborg home game on Norwegian National Day. The overall budget for the build is NOK kr. 640 mill (approx 80 mill Euro) and once complete the hotel will be operated by the Scandic group, the largest hotel chain in the Nordic countries.