Diagnosis

How to diagnose rising damp?

ABSENCE OF DAMP-PROOF COURSE

 

The damp-proof course, or capillary break, of which old buildings are often deprived, is laid on the upper course of the footing of a masonry work as a basis for the rest of the building (see diagram above).

 

MINERAL SALTS ANALYSIS

 

 

Mineral salts, such as sulphate and nitrate, are carried along with capillary rising damp, which is why materials must be tested for the presence of salts (salt indicators) (see picture above).

ELECTRIC CHARGE

 

 

Due to friction, the water running in the fracture lines generates an electric charge that can be measured with a voltmeter.

(see picture above)

 

IRREGULAR DAMP LINE

The damp line is generally shaped as a 5- to 7-foot-high wave.

 

MOISTURE METER

 

 

The moisture meter can be used to measure the moisture present in materials.

 

CARBIDE BOMB

 

 

Measuring damp using the “carbide bomb” test is essential to assess water content in the materials and have a trustworthy reading to plan the restoration work.