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Structural material that resembles ordinary, "dicot" or conifer timber in its gross handling characteristics is produced by a number of monocot plants, and these also are colloquially called wood. Of these, bamboo, botanically a member of the grass family, has considerable economic importance, larger culms being widely used as a building and construction material and in the manufacture of engineered flooring, panels and veneer. Another major plant group that produces material that often is called wood are the palms. Of much less importance are plants such as Pandanus, Dracaena and Cordyline. With all this material, the structure and composition of the processed raw material is quite different from ordinary wood. My meter tells me anything above 12% is ‘wet’ but I cannot find any source of leaking or signs of water. I am not sure if this is pressure treated wood given it’s an exterior wall and if that affects what these numbers are. a b "APA – The Engineered Wood Association" (PDF). apawood.org. Archived (PDF) from the original on June 27, 2006.
Capon, Brian (2005), Botany for Gardeners (2nd ed.), Portland, OR: Timber Publishing, p. 65 ISBN 0-88192-655-8 Three years ago, the floor sank in a heavy traffic area and an engineer told me Masonite was used to shim and had compressed. Over a year ago, I re-shim all the piers with metal shims. The floor immediately felt stronger. In heartwood it occurs only in the first and last forms. Wood that is thoroughly air-dried (in equilibrium with the moisture content of the air) retains 8–16% of the water in the cell walls, and none, or practically none, in the other forms. Even oven-dried wood retains a small percentage of moisture, but for all except chemical purposes, may be considered absolutely dry. They are engineered wood floors (Old Masters Garrison II) installed 7 years ago. Plywood subfloor installed on top of vinyl flooring with wood floors glued to plywood subfloor. Excellent installers, if that data point helps any.Knots do not necessarily influence the stiffness of structural timber, this will depend on the size and location. Stiffness and elastic strength are more dependent upon the sound wood than upon localized defects. The breaking strength is very susceptible to defects. Sound knots do not weaken wood when subject to compression parallel to the grain. from other natural things, notably fungi and insects. This is what Formosan subterranean termites can do to wood. I directed a fan onto the area (it’s the corner of the pantry) and in about 12 hours the 1’x1′ area looked drier if not dried on the surface. I bought a moisture meter and found that the area is anywhere from 15% up to a very small area in the corner around 24%/25%. Will leaving the fan on for the next few days solve the issue, or should I rent a humidifier to keep mold growth from happening.
Understanding Wood: A Craftsman's Guide to Wood Technology by R. Bruce Hoadley. Taunton, 2000. An in-depth, practical guide to woodworking. Photo: Left/above: Hardwood comes from deciduous trees like this oak. Its leaves (inset) drop off in the fall and new ones grow in spring. Sterrett, Frances S. (October 12, 1994). Alternative Fuels and the Environment. CRC Press. ISBN 978-0-87371-978-0. The ideal humidity range in some climates may be higher or lower. For example, from 25% to 45% or from 45% to 65%.Turn on the meter. The electrical current will then move from pin to pin and measure the resistance encountered. Brilliant article. Is it possible to get a 99.9% moisture reading (using a Cassain GM-200 hydrometer) on a particle board floor which looks and feels completely dry? The floor (under carpet) had long-term water exposure supposedly from a shower in the adjacent bathroom (according to the plumber). The plumber said that the floor has an elevated moisture reading and took a photo showing the 99.9% (maximum reading) on the meter while the meter was on the floor. There are water stains on the particle board floor, but the flooring felt completely dry a few minutes after the reading was taken (I didn’t see the reading being taken), the floor looks dry in the plumber’s photo, the particle board flooring is not noticeably swollen, and it certainly has no flaking or other signs of disintegration or lessening to its structural integrity. I would have thought that if the floor gave a 99.9% water saturation reading, it would have had to have been noticeably wet. For most areas of the United States, acceptable moisture levels of wood and lumber can range from 9% to 14% for exterior wood or for building envelope components within constructed assemblies. An MC in this range is considered sufficiently dry for exterior in-service wood. For example, if the expected EMC ranges from a low of 6% to a high of 9%, the baseline moisture content of the wood would be 7.5%. Photo: This fence pole was once a tree—and you can still clearly see the annual growth rings if you look down on it from above.
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