Carbide meter
When identifying damp in buildings, architects, surveyors etc may use moisture meters to confirm or obtain a diagnosis. In skilled hands with regular site calibration, moisture meters can be a good starting point.
Carbide meters are one method of measuring moisture content. This technique (sometimes referred to as Speedy Carbide Test after the manufacturer’s name) works by testing a weighed sample of drilled mansory that has been taken from a sample area such as a mortar joint located above the damp proof course. This sample is then placed in a container. A measured amount of calcium carbide powder is placed in a separate portion of the container, and then the container is sealed. The container is shaken and the two substances mix together to trigger a reaction that produces acetylene gas if moisture is present.
The meter will indicate the results of the test. Readings will range from 0 to 5, with a higher number indicating a higher level of moisture.
Carbide meters are likely to give a more accurate measure of moisture content than some other techniques, although they require the removal of a sample - which could be considered by some as destructive. As a result, this method of testing may only be advisable after an electronic meter, or some other method has indicated the presence of moisture.
For more information see: Assessing moisture in porous building materials.
[edit] Related articles on Designing Buildings Wiki
Featured articles and news
Download your free guide.
Four new types of prior approval for solar developments
Online Planning Portal application types from 5 September.
Election fails to spark construction industry revival
Contract awards and planning; post election.
Making diversity and inclusion easy for SMEs
The CIOB tool for companies with limited resources.
Sustainable Futures: Redefining Retrofit for Net Zero Living
BSRIA Briefing 2024, initial speakers announced.
Looking back at the UK's first Passivhaus leisure centre
Reflections on St Sidwell’s Point with CIAT.
A-Level results and electrical apprenticeships
Electrical Skills Index highlights areas with skills shortages.
One of the world's more unusual drive-throughs.
A quick introduction.
Hadrian's Wall Path and the national trails
The trails are heritage assets in their own right.
Articles on timely advice and hydraulic lime.
Building Designers Association of Australia
CIAT and BDAA sign Memorandum of Understanding.
Built Environment Inclusive partners issue statement committed to inclusion.
Building regulation requirements can have unintended consequences.
CIOB announces 2024/25 vice president
Sustainability champion Professor Saul Humphrey.
Accelerating towards a net-zero built environment.