Edition 3 – Drainage & Waterproofing
This news article informs you of another common cause of waterproofing failure – Drainage.
DRAINAGE & WATERPROOFING
- Common failures are caused by poor drainage of surface moisture adversely affecting the waterproofing.
- A builder would not install a metal or tiled roof without the minimum specified gradient for surface drainage.
- This however is not the case with waterproofing.
- It is still a common occurrence that waterproofing membranes are installed on horizontal surfaces without falls for substrate drainage.
- Single component acrylic membranes were renowned for re-emulsification under saturated conditions in the 1980’s and 1990’s. (Wet-seal does not have acrylic membranes).
- While products have changed, the construction methods have not.
- Nearly every part of a building exposed to surface water or conveying water has specified gradients including stormwater pipes, eave gutters, box gutters, sanitary pipes, culvert drains and kerbs.
- Water migrates through grout and builds up over the membrane within the screed. When there is inadequate fall to the waste outlet, this tends to lead to salt calcification/efflorescence. This can be avoided by ensuring there is fall to the outlet and good drainage.
- Whilst waterproofing is designed to protect the structure and prevent water ingress into the building there is often little consideration given to the drainage to ensure the waterproofing membrane’s performance.
- The failure of waterproofing is often associated with poor or non-existent drainage particularly at the subsurface level.
For any other advice of a technical nature, Wet-seal’s highly experienced technical expert, Robert Rath, will be happy to take your call. Robert can be contacted on 0800 436 000 or via email email@example.com
Alternatively, please speak with your local Franchisee directly. Details of how to contact your local Franchisee can be found at Find A Franchisee