Answer to Howard Parkinson

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Posted by Bengt Blomberg on March 31, 2001 at 05:53:01:

Hello Howard,
The level of the readings does not tell much about the hydrolysis
status. Also if the meter shows 20% it does not mean that the laminate
holds 20% of water. The scale is related to how much a pine wood can
absorb, so called relative moisture. Almost all meters are accurate on
wood, but for a polyester laminate the percentage shown on the meter depends
on the type of meter and which scale range that is used.
For instance if the laminate have absorbed 5% actual moisture, most meters
will go in the bottom of the scale. There are many old hulls which absorbs
up to 10% within a few months from launching but still do not devellop any
hydrolysis. Alarming is, when the moisture readings differs very much and abrupt
in different hull areas. Then you will have to drill small test holes into the
areas with the highest readings to find out what causes them.
Please e-mail me type and age of the hull and try to find out which meter the
surveyor uses and I will be able to give more advise.
Regards Bengt

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