8
MEP USER GUIDE
d. Acceptable levels of moisture content depend on
climatic conditions and we advise you check the
levels acceptable in your area. The table on page
10 shows the approximate relationship between
the ambient relative humidity and equilibrium
moisture content in woods.
e. As a rule of thumb and depending on climatic con-
ditions, exterior wood is generally considered safe
for painting when the moisture content is 14% or
below. Wood below 10% is generally considered
suitable for painting indoors. (Always check coat-
ing manufacturers recommendations).
f. The following moisture content levels are often
quoted in the wood industry and should be used as
a guide only. Please contact industry associations
and manufacturers for their specifications.
• Furniture: 5% to 6% when used in locations of low
relative humidity and up to 10% to 11% may be
acceptable where the relative humidity is higher.
• Indoors wood: 6% in low humidity areas. Up to
12% in higher humidity locations.
• Exterior wood: 10% to 15% depending on local
humidity levels.
• Generally, wood moisture content in excess of
23% - 25% is susceptible to rot.
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