This is a cache of https://www.paroc.com/en/article/multi-family-houses-gothenburg. It is a snapshot of the page as it appeared on 2026-02-22T00:51:14.344+0000.
Energy efficient wooden apartment blocks | Paroc Article
Paroc
Brf Träkronan wooden apartment blocks, Gothenburg, Sweden

Energy efficient wooden apartment blocks

Written By Paroc•Date Published 2025-04-02

Close to both the city and nature and with a view of Gothenburg, FO Peterson's new prestige building, Brf Träkronan, is built from wood and has fire-resilient and energy-efficient stone wool insulation. The stone wool insulation enables the construction of long-lasting buildings that are comfortable inside and have lower energy consumption.

One of Gothenburg's first apartment buildings built of wood is high up on a hill near the center of the city. Brf Träkronan consists of three contiguous but staggered buildings. It is 7–8 stories high, with nearly 60 2–4-room apartments. Most of the apartments have a balcony or patio, and several have double balconies. The view from the hill is lovely! 
 

Wood and stone wool in combination

FO Peterson, the main contractor, chose to build in wood. According to Tomas Käll, architect for the project, it was the company's CEO, Jonas Steen, who made the choice of material. Both the frame and the load-bearing exterior walls are made of CLT (cross laminated timber). To insulate the wooden structure, PAROC Stonewool insulation and the PAROC ZEROfix self-supporting system were chosen. 

"We wanted to design a wooden house, partly for environmental reasons but also to be able to work with wood and to benefit from its aesthetic possibilities," says Tomas Käll. "Stone wool has great advantages because it is a non-combustible insulation material that goes well with wooden houses."


Fire requirements made the choice easy

Anton Svensson, project manager for Brf Träkronan, has spoken about the choice of materials and how the choice of insulation was based on the desire for a fireproof solution. "The fire consultant was very particular about what should be in the façade. One of the requirements was that the chosen material had to have passed an approved SP Fire Test," Svensson says.

The strict fire requirements made the choice of insulation easy. Stone wool is classified as Euroclass A1, the highest fire class, which was also the fire consultant's requirement for the project. The combination of a wooden frame and stone wool insulation is also a proven concept, supported by the project's fire consultant.

A self-supporting system makes quicker installation possible

In addition to the very good fire properties of the PAROC ZEROfix system, Anton Svensson highlights smooth installation as a contributing factor when choosing the system. Tomas Käll agrees, and adds: "There are great advantages in that we do not need to use supplementary studs for attaching the insulation. Also, all the connections in the window and door openings are well thought out and function well."

"We get a very energy-efficient façade.* The installation of stone wool with fewer steps also seems to be efficient, and the recycling of cut waste material is good for the environment," Käll says.


(*total insulation thickness 200 mm PAROC Klimatskiva Zero + 50 mm PAROC Cortex with integrated wind protection)
Alexander Liljenhed, Deputy Site Manager at Brf Träkronan
Alexander Liljenhed of FO Peterson is Deputy Site Manager at Brf Träkronan. He explains how important the product's fire properties have been in the choice of insulation material.  

A unique method

PAROC ZEROfix is a unique, self-supporting fastening method for the external insulation of exterior walls. The fastening method consists of horizontal and angled façade screws and provides a very robust construction with minimal thermal bridges. The façade screw is specially designed to attach battens to the outside of the insulation layer and thus enable an air gap between the insulation and the façade cladding. It is designed to transfer wind and vertical loads to the load-bearing structure. The screws carry the weight of both the insulation and the exterior façade cladding. The horizontal façade screws transmit the wind load from the façade cladding, and the angled façade screws transfer the vertical load.

At Träkronan, 200 mm PAROC WAS 35, Climate Disc ZERO was chosen as insulation in combination with 50 mm PAROC Cortex, which has an integrated wind protection membrane. Thanks to the large size of the insulation slabs and the fact that the system consists of few parts, the solution is both cost effective and time efficient to install. 

Many square meters in one day!

Thanks to the fact that the system is self-supporting, installation at the workplace goes very smoothly. Fredrik Lennhede, who is the leading installer for the contractor Byggbolaget, confirms this: "Mounting PAROC ZERO in combination with PAROC Cortex on a CLT frame provides a stable and good wall. The system is very easy to assemble, you get a lot of square footage done in a day and it becomes a tight façade when everything is in place,” he says.

Fredrik Lennhede, the leading installer for contractor Byggbolaget
Fredrik Lennhede, Byggbolaget, working for the first time with PAROC ZEROfix at Brf Träkronan. He is very pleased with the speed of progress, thanks to the smooth assembly. 
Share this page on: