How much does Western Larch (Tamarack) move?
Western Larch (Tamarack) has moderate seasonal movement, typical of many furniture woods. Standard wood-movement precautions on wide panels apply.
A 24-inch-wide Western Larch (Tamarack) panel, across the seasons
Going from humid (summer, unconditioned) (about 13% moisture content) to dry (heated interior, winter) (about 6%), a 24-inch-wide Western Larch (Tamarack) panel changes width by roughly:
0.57″
Flatsawn (plain-sawn)
Tangential shrinkage 9.1%
0.28″
Quartersawn
Radial shrinkage 4.5%
Computed with the USDA Forest Products Laboratory dimensional-change formula from published green-to-oven-dry shrinkage figures. Real-world movement varies with your actual humidity range, board width, and how the wood was dried, this is a representative estimate, not a guarantee.
Flatsawn vs. quartersawn Western Larch (Tamarack)
Flatsawn Western Larch (Tamarack) moves about 2.0× as much as quartersawn across its width (tangential shrinkage of 9.1% versus radial 4.5%). That’s why quartersawn stock is prized for tabletops, wide panels, and anything where seasonal movement would cause problems, it moves less and stays flatter. The gap is large for Western Larch (Tamarack), so quartersawing makes a real difference here.
Run your own numbers
These figures use a 24-inch panel and a typical seasonal swing. For your exact board width and humidity range, use the interactive calculator, Western Larch (Tamarack) is already loaded with its verified shrinkage data.
Open the wood movement calculator →Managing Western Larch (Tamarack) movement in a build
Wood moves across its width, not its length, so the wider the panel, the more it matters. The classic precautions apply: let the wood acclimate to your shop before building, attach wide tops with fasteners that allow movement (elongated screw holes, buttons, or figure-8 clips), avoid gluing solid panels rigidly across the grain, and account for seasonal swing in fitted parts like drawers and doors. For Western Larch (Tamarack) specifically, its moderate movement means standard practice is usually enough.