Knowing the
moisture content in wood during any project can be crucial to its success. From
the mill floor to the final installation, wood’s moisture levels do not stay in
a static state until they are sealed. The same porous cellular arrangement that
gives wood its ability to demonstrate beautiful grain patterns when stained
also means that ambient humidity, limited airflow, surface moisture or sudden
temperature changes can all contribute to changes in the wood’s moisture
content. So to use any wood without having an accurate picture of the moisture
levels is to gamble on the end result.

For large
lumber interests, this moisture level is crucial. A mill’s drying process has a
target moisture range that is necessary in grading the finished lumber and an
overdry or overwet charge means losses of real business dollars. For the
contractor, dimensional lumber or wood flooring that has a high moisture
content can buckle, crack, cup or splay after installation. If a finish, such
as a carpet, is applied over a wood base with a high moisture content, mold can
also become an issue.
In the
professional or hobbyists’ shop, too, wood moisture issues can also lead to
frustrating, costly and time-consuming challenges. Swelling, gaps at joins and cornices, cracks,
warping and even finish failures can all be traced back to moisture-related
problems.
Fortunately,
measuring the moisture content in wood doesn’t have to be a gamble.
From the
hobbyist to the professional, from small interests to sawmill operations, a
variety of wood moisture meters can make moisture content easier to monitor and
to maintain.
While in-line systems are efficient for large lumber operations,
most wood moisture meters are portable handheld meters which typically fall
into two types:
“Pin” meters
take their readings by penetrating the wood with two or more sharp probes that
pass a small current between them. The
moisture measurement is determined by the wood’s resistance to the current.
Obviously, this process leaves small holes in the wood so it is not always the
best technology choice for finish contractors or woodworkers.
“Pinless”meters use electromagnetic signals to measure the moisture content. Some brands
are susceptible to surface moisture although technological advances mean some
are able to determine an accurate depth reading even in the presence of surface
moisture.
Finding the
right moisture meter can give any wood worker better odds at hitting the sweet
spot for their wood project. And those are odds you can
bet on.