LaserLiner MoistureFinder Manual De Instrucciones página 8

Determining material moisture
6
max. 30 mm
Due to the differing constitution and composition of materials,
specific application notices are to be followed for their moisture
assessment:
Screed: This device also measures through tiles, linoleum,
vinyl and wood but these coverings will influence the measure-
ments. The resulting value is therefore to be viewed as a
relative value to localise moisture and moisture paths.
Plaster: This device also measures through wallpaper and paint
but not through metal (foils). Though measurements may be
influenced, the moisture in walls can be readily tracked by
moisture differences such that conclusions can be made with
respect to damage, for example, to insulation, vapour barriers
or masonry.
Softwood / hardwood: The measurement should be made
with the length of the device in parallel with the grain of the
wood. The measured depth in wood is 30 mm maximum but
does vary somewhat with differing wood densities. Measure-
ments made on thin wood boards should, if possible, be made
on a stack of these boards as otherwise the measurement will
be too low. Measurements made on installed wooden struc-
tures are influenced by the structural conditions and their che-
mical treatments (e.g. paints) with various materials. Thus such
measurements should only be viewed relatively. Nevertheless,
the differences in moisture distribution are very good for
localising moist places as an indication of damage, e.g. in
insulation.
Greatest accuracy is reached between 6 % and 30 % material
moisture. In very dry wood (< 6 %) irregular moisture distribu-
tion can be detected, in very wet wood (> 30 %) saturation of
the wood fibres begins.
08
GB