The holiday village in Vielsalm in the heart of the Belgian Ardennes was completely refurbished before its scheduled opening in December 2017. For this massive project, DuPontTM Tyvek® breather membranes were used as a roof underlay to ensure the watertightness of all 350 cottages on-site. It was also used to protect against interior moisture while improving home insulation, making the running of the cottages considerably more cost-effective.
Step 1 of the refurbishment: adding an extra layer of insulation after removing the roof
A fully watertight roof, with guaranteed proven results for 25 years.
With watertightness a key element of roof protection, DuPontTM Tyvek® was a natural choice, given its proven ability to provide long-term protection, while most other conventional solutions have been seen to let water in within 10 years. One recent study, which took samples from 30 different roofs, clearly demonstrated the difference in durability between roof types depending on the technology used. (http://tyvek.construction.dupont.com/rooftest)
As Vincent Grégoire, head of roof specialists Vincent Grégoire SPRL, which worked on the project, noted: "Our aims were two-fold: to meet the quality requirements in the project specifications and to complete the project within budget. I was already aware of DuPontTM Tyvek®, which I use increasingly for refurbishment projects and new construction, including detached houses and public buildings, such as schools. DuPontTM Tyvek® is the only underlay membrane I know of that doesn't perish over time as others do. The manufacturing process is different, creating a uniquely durable, quality product."
A breather membrane to provide sustainable clean air for houses
To allow the roof to "breathe", the DuPontTM Tyvek® membrane lets water vapour seep through its pores while preventing moisture infiltration. This is made possible by a thick single layer made from high-performance polyethylene, which is itself made up of thermally bonded microfibres. The DuPontTM Tyvek® functional layer is six to eight times thicker than traditional membranes
Step 2: Placing the Tyvek® on the roof. Approximately 25,000m2 of membrane was required for the project.
The microfibres are more heat and UV-resistant, which contributes to the membrane's exceptional resistance and durability. DuPontTM Tyvek® membrane's excellent durability results in significantly improved costs in comparison with conventional membranes by avoiding the damage caused by wear and storms.
Step 3: lathing and counter-lathing
Each house has received a complete roof refurbishment through the following steps: roof removal, insulation layer addition, installation of DuPontTM Tyvek® breather membrane, lathing and counter-lathing, fitting of gutters and fibre cement roof slates. Lastly, a roof window, chimney and vent were installed before applying the perimeter finishings. The work, carried out by roof covering specialists Vincent Grégoire SPRL, required six people over a full day to complete each individual roof refurbishment.