Abstract
The study is focused on the decreasing of oriented strand boards air permeability using paints. The oriented strand boards /3 (classification according to EN 300:2006) of 12 mm thickness was chosen for the measurement. Nine different paints were applied in one layer on one side of boards. The difference in air permeability of unpainted and painted boards was defined as paint impact in %. Paint impact ranged from 1,9 % to 78,6 %. Furthermore, the air permeability of 15 and 22 mm thick oriented strand boards /3 boards from another producer exhibiting better properties has been measured to compare. The best results of paint impact were obtained for latex paint (paint impact 78,6 %) and penetration 1 (paint impact 66,4 %). Decreasing of the air permeability of oriented strand boards applied in low-cost constructions by using inexpensive paints could significantly improve the insulating properties of the wall structure and thus contribute to the development of the concept of low-cost passive building.
Highlights
The oriented strand boards (OSB) is a material made of large, flat and oriented strands on the surface and smaller strand fraction inside the board
Paint impact indicates the increase of the air permeability of the sample after paint application in percentages
The difference in the paint impact of penetration 2a and 2b shows that air permeability is more influenced by a paint with a higher content of fillers
Summary
The oriented strand boards (OSB) is a material made of large, flat and oriented strands on the surface and smaller strand fraction inside the board. The geometry and arrangement of the strands in surface layers serve as an important factor influencing the board properties. These production factors determine the physical and mechanical properties of OSB boards (Goroyias and Hale 2004). The content of the pores in the board is determined by the production factors such as the pressing conditions, the strand geometry and the degree of their arrangement (Langmans et al 2010, Gaete-martinez 2008).
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