We frequently receive questions about the proper waterproofing setup for Triotherm. To clarify, we’ve outlined the correct approach below.
No DPC, damp course, or DPM (or any similar barrier) is needed in its traditional form!
Curious to learn more about the reasons and the process? Keep reading to dive deeper.
1. Door upstands and DPC on the old fashioned way...
Concrete upstands, a noteworthy innovation of the mid-20th century, require effective waterproofing to prevent dampness from seeping further into the building once the concrete becomes fully saturated.
Unfortunately, some building professionals still specify the outdated method of using a loose layer of DPC/DPM for this purpose.
What’s the issue with that?
The simplest way to illustrate the common issues lies in examining a timber frame structure. When the DPC (Damp Proof Course) is loosely applied, there is always a significant risk of dampness bypassing it. Additionally, there's a heightened risk of condensation forming beneath the DPC. This occurs when the dark material absorbs heat from sunlight during the day and cools rapidly at dusk. While this issue can also affect other building materials such as blockwork, brick, or ICF (Insulated Concrete Form), its impact is far more severe in timber structures.
2. How does Triotherm prevent dampness without relying on DPC?
Triotherm is inherently resistant to dampness, thanks to its construction from EPS (expanded polystyrene). Unlike timber, concrete, stone, or brick, EPS absorbs significantly less moisture. In fact, its water absorption rate is just ≤ 0.5 vol.% after 28 days of submersion, as tested according to DIN 12087 standards.
Additionally, the use of Power Fix Sealant ensures a watertight connection between the subfloor and Triotherm, as well as between Triotherm and the door frame, offering another layer of protection against water ingress.
Furthermore, our FLK Liquid Rubber Tanking provides comprehensive protection for the entire door upstand, even under certain water pressure conditions. This tanking solution is applied after the door installation is completed, ensuring a robust and durable seal.
Stay tuned for more details about the FLK Liquid Rubber Tanking, which we will be sharing soon.
