AIVC - Air Infiltration and Ventilation Centre

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Evaluation of moisture buffer effects by performing whole-building simulations

The humidity of rooms and the moisture conditions of materials in the enclosure of buildings depend much on each other because of the moisture exchange that takes place over the interior surfaces. These moisture influences also depend strongly on the thermal conditions of indoor spaces and enclosure elements of buildings. In turn, the moisture and humidity conditions have significant impact on how buildings are operated.

A preliminary investigation on the use of ultra-wideband radar for moisture detection in building envelopes

A preliminary investigation has been carried out to determine the potential for using ultra-wideband (UWB) radar to determine the moisture level within building envelopes. Radio waves are affected by moisture content because their reflection from the surface of a material depends upon the dielectric

Estimating effects of moisture damage repairs on students' health - a long-term intervention study

The aim of that study that lasted 5 years was to assess the effect of repairs made to moisture-damaged school buildings on the students' health. With repeated questionnaires it was possible to compare the occurrences of symptoms before and after the repairs in school.

Magnitude of the mould and moisture problem in Danish homes

The purpose of this study was to quantify the extent of moisture problems in Danish homes. Aquestionnaire-based survey was made and a representative sample of 3800 Danes older than15 years responded. Main results are that 17.6% of the people have had moisture damages intheir dwelling during the last 5 years and among those as much as 36.4% have not yetremedied the damages. A total of 17.7% have moisture or mould spots on their walls, ceilingsor floors.

Moisture conditions and energy consumption in heated crawl spaces in cold climates

The aim of that study was to find out if heating is the alternative for crawl space moisture control with a reasonable low energy consumption. Using a ground cover without thermal insulation and heating of the crawl space proved to be a good alternative method to control mold growth.

Moisture conditions in highly insulated outdoor ventilated crawl spaces in cold climates

The aims of that study were to find out how the thermal capacity, resistance, and the placement of insulation layers affect relative humidity in crawl spaces. The results show that there are two alternative ways to use ground covers in combination with air change to achieve acceptable conditions in crawl spaces.

On the crawl space moisture control in buildings

The aims of that study were on the one hand to find out how relative humidity can be reduced by optimal selection of ground covers and air change rates, and on the other hand to evaluate the acceptability of achieved moisture conditions by means of mould growth analyses. Two buildings (one relatively warm and the other relatively cold) were studied with the resistance-capacity network model. Simulations of thermal and moisture buffering effects of air change rates and various ground covers were made.

Microbial contamination of indoor air due to leakages from crawl space - a field study

The aim of that study was to find out if a potential air flow from crawl space has an influence on the indoor air quality : is there a potential risk for the first floor apartments ? A balanced ventilation system is recommended.

Moisture control in cold climates - the report of ISIAQ Task Force IX

The work of Task Force IX started in 1997 at a workshop in Washington Healthy Buildings conference. It continued at the Indoor Air ‘99 conference in Edinburgh, Scotland, and the following workshops took place at Healthy Buildings ‘00 in Helsinki, Finland

Fungal index in dwelling environments

Microclimates in moisture chambers and environment in houses were evaluated using afungal index. The index was calculated from the growth rate of a sensor fungus in a test piece,fungal detector, during an exposure period to the test environment. In the constant climates inthe moisture chambers, higher indices were obtained at higher relative humidity. In the roomswith higher fungal indices, the densities of airborne fungi were higher, indicating arelationship between the index and fungal contamination.