Will Solid Wood Cabinet Doors Warp?

Every buyer of a solid wood door has been told to buy something else, and the reason given is always the same word. So here is the honest answer. Solid wood moves with humidity, in one direction, by a known amount, and a cabinet door is built so that movement never becomes a warp. This is how.

What wood actually does

A board gains and loses moisture with the air around it and swells and shrinks across its width as it does, by roughly a sixteenth of an inch across a 15 in door between a dry winter and a humid summer. It barely moves along its length. That is not warping; it is the seasonal breath every wood floor and every wooden door in your house takes, and a door hung with even reveals has room for it. Warping is something else: a door that cups, twists or bows because one face moved differently from the other, or because the boards in it were pulling against each other. Both are preventable, and preventing them is most of what a door maker does.

Thickness: 7/8 in over 10 in wide

A thin, wide panel is the one that cups. Most makers answer by capping the width of a solid door at 10 in or so; we answer by going thicker. Under 10 in across the grain, 3/4 in is plenty and it is what we recommend for drawer fronts and narrow doors. Over 10 in we recommend 7/8 in, and we offer 1 in for very tall doors. The extra eighth is the stiffness that keeps a 24 in pantry door flat, and the same cup hinge takes it.

The boards: rift and quartersawn where it counts

How a board was cut from the log decides how it moves. Flat-sawn boards move most across their width and are the ones that cup; rift and quartersawn boards move about half as much and stay flat. We pick the boards for a door with that in mind, and every front in an order is cut from one bundle of kiln-dried lumber, acclimated in the shop, so the doors in a kitchen move together rather than each on its own.

Finish on both faces

A door finished on the front only takes moisture through the back and dries through the back, and that difference between the two faces is exactly what cups it. Every door we make is finished on both faces and all four edges in the same hardwax oil, so the two sides breathe at the same rate. Unfinished doors ship raw for your own finisher; finish both faces, and finish them the same.

The one-piece shaker

A traditional five-piece shaker door has a panel floating in a frame, and the places it fails are the four corner joints, which open as the frame moves, and the panel, which can rattle or crack if it was glued in. Ours is routed from a single solid glue-up, so there are no joints to open and no floating panel: the frame and the panel are the same piece of wood, moving as one. It is the reason we build the shaker this way.

Grain direction

Vertical grain is the default on a door because the width of the door, where the movement is, is then the narrow dimension of the boards. Horizontal grain on a tall door puts the movement up the door's height instead, which is why we recommend horizontal grain on drawer fronts and wide, short doors, and vertical on anything tall, and the Builder says so as you choose.

What we will not build

A 3/4 in slab door 30 in wide, or a 1 in horizontal-grain pantry door 80 in tall. The Builder lets you type any size, and when a size is outside what we would hang in our own kitchen it tells you and recommends the thickness or the grain that would. If your room runs very dry in winter or very humid in summer, say so in the notes and we will pick the boards accordingly.

The honest summary

A solid wood door moves a sixteenth of an inch a year and lasts the life of the house, and a scratch in it is oiled out in a minute. Built the way described here, thick enough for its width, from the right boards, finished on both faces, in one piece where it is a shaker, it does not warp. Lead time is 4-6 weeks today. See the cabinet doors, or the one-piece shaker.

Two ways to order. Price your doors in the Builder, front by front with a live price, or send us your plans and we build the door list for you, at the same prices, within one business day.