Built-in moisture in the insulation layer of a compact roof will generally dry out very slowly, compared to the drying rate in a ventilated roof construction. Intended or unintended leakages of outdoor air through the insulation layer may, however, speed up the drying rate. In this investigation, the drying potential of various configurations of compact wood frame roofs with a high level of built-in moisture has been investigated, through test house measurements and hygrothermal simulations. Compact wood frame roof elements has been wetted, and mold spores has been added to the elements. The hygrothermal conditions of the elements has been monitored through a period of 2 years, and the microbial conditions has also been registered. The possible drying effect of outdoor air leaking through the insulation layer from one side of the roof to the other has been investigated.
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2.
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6.
Holme, J., Noreng, K., Kvande, T. ( 2008). Moisture and Mould Growth in Compact Roofs - Results From a Three-Stage Field Survey, In: Proceedings of 8th Symposium on Building Physics in the Nordic Countries, Copenhagen, Denmark, 16-18 June, pp. 1221-1228.
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8.
McGinnis, M.R. ( 2007). Indoor Mould Development and Dispersal, Med. Mycol., 45: 1-9.
9.
Nielsen, K.F., Holm, G., Uttrup, L.P., Nielsen, P.A. ( 2004). Mould Growth on Building Materials Under Low Water Activities. Influence of Humidity and Temperature on Fungal Growth and Secondary Metabolism , Int. Biodeterior. Biodegrad., 54: 325-336.
10.
Noreng, K., Time, B., Kvande, T., Uvsløkk, S. ( 2005). Moisture in Compact Roofs - Results of a Two Stage Field Survey, In: Proceedings of 7th Symposium on Building Physics in the Nordic Countries, Reykjavik, Iceland, 13-15 June, pp. 695-702.
11.
Nunes, C., Usall, J., Manso, T., Torres, R., Olmo, M., Garcia, J.M. ( 2007). Effect of High Temperature Treatments on Growth of Penicillium spp. and Their Development on ‘‘Valencia’’ Oranges, FoodSci. Technol. Int., 13: 63-68.
12.
Oustad, M., Uvsløkk, S., Gustavsen, A. ( 2005). The Drying Potential of Compact Roofs - Diffusion, Project Report 386, Norwegian Building Research Institute, Trondheim. (in Norwegian)
13.
Paukstys, V., Seduikyte, L. and Buska, A. ( 2007). The influence of ventilated air channels on the distribution of temperature and moisture in the mineral wool plates of roof construction . In: Proceedings of 9th Interantional Conference of Modern Building Materials, Structures and Techniques , Vilnius, Lithuania, 16-18 May, pp. 131-135.
14.
Salonvaara, M. and Nieminen, J. ( 2002). Hygrothermal Performance of Low-Sloped Roofs with Groove Ventilation, In: Proceedings of 6th Symposium on Building Physics in the Nordic Countries, Trondheim, Norway, 17-19 June, pp. 239-246.
15.
Sedlbauer, K. ( 2002). Prediction of Mould Growth by Hygrothermal Calculation , J. Building Phys., 25: 321-336.
16.
Uvsløkk, S. ( 2008). Selfdrying Mechanisms in Compact Roofs. Project Report 19, SINTEF Building and Infrastructure, Trondheim, Norway. (in Norwegian)
17.
Viitanen, H. ( 2004). Critical Conditions for the Mould Growth in Concrete and in Other Materials Contacted with Concrete - Durability of Concrete Against Mould Growth, VTT-Work-6, Finland.
18.
Wang, Q. ( 1992). Wood-Based Boards - Response to Attack by Mould and Stain Fungi, Sveriges Lantbruksuniversitet - Institutionen for virkeslära, Uppsala, Sweden.
19.
Zabel, R.A. and Morell, J.J. ( 1992). Wood Microbiology - Decay and its Prevention, Academic Press, New York.
