A variation in moisture, content, and industry standards all contribute to the size and weight of wood fences.
Many species of wood turn gray as it ages, but some turn silver or almost black. This is a natural reaction to the aging process.
When nails are driven into a piece of wood, usually the hammer knocks off the galvanized coating on the head of the nail. Eventually, the streaking caused by the rusting of the nail head will blend with the weathered gray of the wood.
All ACQ treated lumber, including water repellent, will internally dry during the first 60 to 90 days after installation. This drying process will lead to shrinkage and some checking on the boards.
Every piece of wood is constantly taking on or giving off moisture in an attempt to reach the same humidity level as the surrounding atmosphere. During long dry periods, boards will shrink, leaving gaps. Additionally, during periods of heavy rain, the wood expands and the gaps will close.
Nails can cause the wood fibers to split. Additionally, the ends of a board dry quicker than the middle. This stress can cause splits.
In the installed climate, wood cells lose their natural water content to the air, which causes shrinkage and movement.
Lumber is a porous material. Wood swells when it absorbs moisture from rain or snow and shrinks when the sun’s heat releases the moisture. This drying process creates stresses in the wood which are often relieved by warping, splitting, and cracking.