Water absorption (WAC) test
Book Water absorption (WAC) testA WAC test measures the rate at which water is absorbed by a material, typically bricks or stones. This data is vital for ensuring materials meet British Standards for durability, particularly in areas exposed to weathering and frost, preventing potential long-term damage.
When do you need a Water absorption (WAC) test?
A WAC test is typically needed when specifying or assessing the suitability of masonry materials for new construction or renovation, especially in exposed locations where frost damage or damp penetration is a concern.
What happens on the day
A technician will visit your site to carefully collect samples of the masonry materials. These samples are then sent to a laboratory for controlled testing.
How to prepare
- Ensure access to the masonry from which samples will be taken
- Confirm the specific material you wish to have tested
- Be aware that small samples will be removed from the material
- Provide any existing material specifications if available
How to improve your result
- Always specify materials that meet relevant British Standards.
- Consider the exposure level of your building to the elements.
- Ensure appropriate damp-proof courses and membranes are installed.
- Regularly inspect masonry for signs of damp or frost damage.
Why it is useful day to day
Using materials with appropriate WAC values prevents long-term structural damage from water ingress and frost, saving significant repair costs and maintaining building integrity.
Why we ask these questions
We ask about the material type and location to ensure we understand the specific testing requirements. This helps us to correctly advise on sample collection and what the results will mean for your project.