- Project plans
- Project activities
- Legislation and standards
- Industry context
Last edited 20 Apr 2018
Tanking is a term used for creating a tank-like seal to protect walls against water penetration. The Building Regulations stipulate that tanking must be applied to all new build structures below ground, but tanking can also be applied to existing buildings, to prevent water penetration into basements and cellars, as well as helping to tackle rising damp.
The two main methods of tanking are by using a membrane or a coating. The type of damp and the precise requirements of the building will determine the most appropriate method to use, and sometimes a combination is required to ensure walls remain dry.
 Tanking membranes
The studs create an air gap cavity between the wall and membrane. Where there is no visible water in the cavity, ventilation may be adequate to prevent the accumulation of moisture. Where water is present, drainage or a or sump and pump may be necessary.
Tanking coatings include; bitumen, asphalt, resin/tar and tanking slurry.
Liquid bitumen is painted onto cleaned masonry or render but is best for smaller jobs or for coating externally below the damp-proof course. It can prove difficult to apply to masonry in older buildings as it can separate from the wall if applied incorrectly.
Resin/tar coatings are typically epoxy or polyurethane resins extended with tar or bitumen. They are generally able to withstand higher pressures than bitumen coatings.
 Find out more
 Related articles on Designing Buildings Wiki
Featured articles and news
A form of procurement where the contractor provides a single point of contact for a supply chain.
A month after the devastating fire, emergency reconstruction works are underway.
The London Build Expo is hosting a Diversity in Construction panel and networking session on October 24.
Analysis can help develop a specification, but must not lead to inappropriate specifications being accepted.
Dos and don'ts for creating a smart home.
New ICE publication recommends pay-as-you-go tax to fund roads and other financing options.
BSRIA launches a White Paper on wearable technology and wellbeing in buildings.
Have the pressures of the market shredded the core values of professionalism?
Lead times are a measure of the amount of time that elapses between initiating and completing a construction process.