This paper presents and discusses results of moisture transfer into timber frame constructions. The two mechanisms of transfer are diffusion and bulk air movement. Three defects in construction were monitored punctured vapour barrier, continuous path via an electrical socket and discontinuities at junctions. The study has shown that, under steady-state conditions condensation can take place, while under varying conditions both condensation and evaporation occur. This second case is typical of the building in use, and can prevent high levels of moisture existing in timber components.
Discusses the various causes of unwanted air infiltration in dwellings. Illustrates diagrammatically the commonest structural faults leading to adventitious air infiltration and gives methods of overcoming them. Notes the average cost of such improvements.
Login