- Project plans
- Project activities
- Legislation and standards
- Industry context
- Specialist wikis
Last edited 05 Oct 2020
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.
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.
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.
 Related articles on Designing Buildings Wiki
Featured articles and news
A review of achievements and disappointments.
IHBC responds to PDR and defence infrastructure development.
Final report proposes improvements for UK-wide transport infrastructure.
The decarbonisation transition has begun.
Can smart homes take care of their occupants?
A showcase of She ethnic culture.
CIOB creates charter and publishes special report.
Response submitted by IHBC.
Designed to accommodate flooding or waterway traffic.