doty

Doty wood is timber that has begun to decay, typically from fungal attack or prolonged moisture exposure. The wood becomes soft, spongy, and loses structural integrity while often appearing sound on the surface. A carpenter will discover doty wood when a tool penetrates easily into what should be solid timber, or when probing with a spike reveals hollow pockets and crumbling grain.

The term appears most commonly in British and Australian carpentry, particularly among framers and restoration workers. Doty timber is useless for structural work: it cannot safely carry loads and will not hold fasteners reliably. A nail or screw driven into doty wood will spin loose as the wood compresses and fails. The decay progresses from the outside inward, so a piece may look weathered but be sound, or may be doty throughout while the outer surface remains relatively firm.

Where doty wood appears

End grain and exposed horizontal surfaces are most vulnerable. Roof timbers with failed flashing, fence posts below ground level, and window sills that have lost their paint are common sources. Doty wood is especially prevalent in Victorian buildings where original timbers have endured decades of leaking gutters or rising damp. Softwoods like pine and spruce rot faster than hardwoods, but any species will become doty given enough moisture and time.

In conservation work, carpenters sometimes splice out doty sections rather than replace entire members, carefully matching grain direction and species. The affected wood must be removed completely; ignoring doty sections during repair guarantees swift failure. Modern pressure-treated replacements or preservative injection may follow removal, depending on the cause of moisture and the building's use.

The word's origin is not certain, though it may derive from the Dutch word for rotten or hollow, or from dialectal English meaning soft or weak. Its persistence in workshop speech reflects an old recognition that waterlogged timber becomes something fundamentally different from sound wood, not merely wet but structurally compromised.