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On a Danish housing estate moisture sensors were installed in dwellings, partly in exterior walls and partly in attics. At each location sensors were installed within the insulation at two positions, one facing the outer cold side and the other facing the inner warm side. The exterior walls and attics were insulated with cellulose, flax and mineral wool as thermal insulation. Exterior walls were constructed without PE vapour barriers while ceilings were constructed with PE vapour barriers. The investigation showed that for a typical Danish way to construct dwellings neither the moisture conditions in walls nor attics provide a risk or concern of mould growth in the thermal insulation.

The thermal performance of cellulose insulation material was investigated and compared with the thermal performance of stone wool batts. The moisture content in selected facade elements insulated with cellulose loose-fill insulation material and stone wool, was investigated as well as the influence of the moisture content on thermal transmittance. The investigation was carried out as a full-scale test under normal climate conditions in a moisture test house facility. Facade elements were built as timber frame constructions. Heat flow through the facade elements was measured with built-in heat flowmeters and the moisture content in the thermal insulation behind the wind barrier was measured with moisture measuring dowels. The test showed that the thermal performance of the tested type of cellulose loose-fill insulation material was significantly lower than the thermal performance of stone wool batts. The maximum moisture content of the insulation material was below, what in Denmark is considered critical for the onset of rot and growth of wood decaying fungi. The thermal transmittance did not change with changes in the moisture content within the investigated hygroscopic range.

Rapporten beskriver resultaterne af målinger af luftbårne mineraluldsfibre, luftbårne ikke-mineraluldsfibre, luftbårent støv samt sedimenterede mineraluldsfibre i 105 lokaler med forskellige loftstyper. Resultaterne vil bl.a. kunne anvendes i forbindelse med vurdering af mulighederne for reducering af antallet af mineraluldsfibre i indeklimaet, fx ved hyppigere rengøring eller forbedret mekanisk ventilation.