Case 3
- Introduction
- Causes of Defects
- Good Practices
- Standards
- Maintenance and Diagnostics
- Remedial
- Similar Cases
- References
Maintenance and Diagnostics
Whether flat roof are constructed of concrete or timber, they need to be laid to adequate falls and incorporate a vapour barrier.
The generally accepted minimum fall is 1 in 80, but the latest recommendation is 1 in 40 to make allowance for any inaccuracies on the site and possible deflection of the roof structure.
Ponding occur only when there is unevenness of the slab surfaces. Regular inspection should be carried out especially after a downpour. This allow for visual inspection of possible ponding area.
When ponding happen, immediate repair is needed. Apply a layer of screed so as to level the surface and take note of the fall, directing the flow of the water to the drainage area.
Diagnostic of defects
Thermography can be used to identify the position of water leakages.
The method is based on the characteristics of heat flow phenomenon, in a conductive medium of specific geometry, which is intended to model predetermined boundary conditions.
Thermo tracer is a advanced equipment used in thermography technology.