There are many techniques for conducting moisture surveys
Non-destructive testing methods used in moisture mapping include visual inspection and surface moisture measurement. Destructive moisture measurement methods, on the other hand, include core sample testing, borehole testing, and probe testing. The concrete moisture content can be measured using the core sample method and borehole measurements. The moisture content of wooden components is examined using the probe method. Destructive measurement methods are most commonly used on construction sites.
When is a moisture survey conducted?
Moisture surveys are typically needed, for example, after water damage, to ensure that excess moisture has been removed. In such cases, non-invasive methods are usually used. As for water and moisture damage, they are relatively common. Water or moisture damage can be caused by, for example:
- water trapped in the cavities of a hollow-core slab
- moisture in the subfloor or basement walls
- roof leak
- a leak caused by a dishwasher or washing machine
- water leak caused by other building services
Call us or fill out the form to get immediate advice from an expert, and we’ll schedule a time for our surveyor to visit your location.
If you've just experienced water damage and aren't sure what to do, you can read more about it from our blog.
Read below to learn more about common issues and the need for moisture surveys.
Measurement of surface moisture in floor mats
Smelly vinyl flooring is a common sign of moisture beneath the flooring. This may be caused by water damage or by covering the concrete too soon. The adhesive backing and the vinyl flooring itself begin to slowly break down due to excessive moisture, which often causes the flooring to develop an odor. Moisture levels under the floor mat can be examined using a slit test, in which a slit is made in the floor mat with a knife and the moisture is measured immediately beneath the covering as a relative humidity reading. This is an accurate method, but the selection of measurement points is important. Surface moisture measurement can be used to first assess the room as a whole, and then more precise results can be obtained from the most critical areas using the incision method.
Moisture damage in structural members
On construction sites, structural timber or other wooden components may be exposed to rain and harsh weather conditions. Other types of moisture damage can also cause wooden components to get wet on the construction site. Measuring the moisture content of the structural timber ensures that it is sufficiently dry to continue construction work.
Moisture Survey for a Home Purchase
Homebuyers are interested in the condition of your home’s wet areas. We assess the functionality and condition of these areas. The moisture survey for a home sale is conducted using a surface moisture meter, meaning a non-destructive method. We also check for loose tiles, i.e., tiles that are poorly secured. Measurements are typically taken in all wet areas of the home, including bathrooms, saunas, and toilets. Additionally, we check for any water damage under the kitchen sink cabinet.
For the purposes of the measurement, you should avoid using the shower or sauna for about 1–2 days prior to the measurement. Surface moisture measurement is an indicative method, but at best it can be used to confirm that wet areas are functioning properly. You can read more about moisture measurement in the context of buying a home from our blog.
Survey of wet areas in a housing complex
We also provide measurement services for housing associations that wish to assess the condition of all wet areas in their buildings. Often, bathrooms in housing complexes have been renovated at different times across the apartments. During the inspection, we assess the condition of wet areas using surface moisture measurements, take photographs of the condition of the wet areas, and inspect the floor tiles. Some bathrooms may be in excellent condition, while others may still have their original bathroom structures. Based on the measurement report, it is easy to plan the housing complex’s repair needs, and the measurement is, of course, more cost-effective per resident when it is done all at once for the entire housing complex.
Moisture surveys for the construction site
Construction sites have their own specific needs when it comes to various moisture surveys and measurements. You can read more about our services for construction sites on our dedicated service page here.