Shop notes · 2026-09-22

Garage cabinets for a Nebraska garage that never gets heated

A garage cabinet lives in the only room of the house with no furnace and no air conditioning, and that writes most of the build.

Our closets and home storage page gives the garage one line: “sealed cabinet banks, workbench runs, and locking storage built for the climate.” The FAQ under it adds the rule: sealed hardwood or marine-grade plywood, finishes that tolerate the temperature swings, and mounting that keeps cabinets off the slab and away from melt water. Both are true, and neither says why. Three forces do the writing: the slab underneath, the swing in the air, and the load on the shelves.

Why do ordinary cabinets fail in a garage?

Because they were built for a heated room. A particleboard box standing on a concrete floor wicks moisture and swells from the bottom edge up. A kitchen-grade finish chalks and hazes under an uninsulated roof. A drawer slide rated for a stack of plates sags when the drawer holds sockets and a cordless kit.

The slab is the first force. Concrete on grade is never dry. It wicks ground moisture year round and sweats in a spring thaw, when warm humid air lands on a floor still cold from February. Add the melt water and road salt dripping off the rocker panels onto the same two feet of floor every winter.

The swing is second. An unheated garage follows the outdoor air and exaggerates the top end, below zero in January and past the day’s high under a dark roof in July. Wood shrinks in dry cold and swells in wet heat, so a door fitted in mild October weather was fitted at the middle of its range.

The load is third and the one people underestimate. A garage bank holds paint and stain, a chop saw, bar clamps, fasteners. That is more weight per foot than a kitchen upper sees, and it lands in lumps rather than spread along the run.

What should garage cabinets be made of?

Exterior-glue plywood boxes, every cut edge sealed, faces in painted or sealed hardwood. The materials guide covers what boxes are made of for the house generally. The garage changes one spec, the glue line, and after that it changes the edges.

Interior plywood is good plywood with a glue that was never asked to survive wet and dry cycling. Exterior-glue panels were, which is what the X in ACX is about. On the lowest course, marine-grade earns its price: no voids in the inner plies for water to sit in.

Edges fail first. Thin melamine or PVC banding on a raw panel edge is a seam, and a seam near a wet floor lets water into the core behind it. A solid wood edge, or finish carried onto the bare edge, ends that, including the edges nobody sees.

Bare MDF is the one material to refuse outright here. It takes paint beautifully in a conditioned room and behaves like a sponge with a flat face in a garage. Once the bottom rail of a door swells over a wet slab, it does not come back.

Finish in damp conditioned air is a different problem, worked through in the laundry room cabinets piece. A furnace conditions that room. An overhead door opening in January replaces the garage’s air in a minute.

Should garage cabinets hang on the wall or stand on the floor?

Hang what you can. A wall-hung run keeps the boxes out of the water that crosses the slab, lets you clean under them, and takes its level from the wall instead of from a floor that is not level on purpose.

The detail that makes it work is a continuous ledger or a French cleat, lagged into the studs at 16-inch centers, with drywall anchors and toggles nowhere in the job. Because the cleat is one straight line, the whole row sets level in a single pass.

Height off the floor gets decided on purpose. Four to six inches of open slab under the lowest box lets a squeegee, a hose and a spring puddle pass without touching plywood, and keeps the boxes clear of the melt line a parked car leaves behind it.

Some things still bear on the floor. A tall unit for brooms, a ladder and long stock gets adjustable metal legs and a removable toe kick, its back anchored into studs, so the kick pulls out and dries. Plywood sitting flat on concrete swells.

What does a workbench run need that a kitchen run does not?

Five things a kitchen never asks for: a working height rather than a reach height, a top you can clamp to, slides built for weight, a lock, and power planned before the boxes go up. A kitchen run is reached into. A bench run is stood at and leaned on.

Start with height. Thirty-six inches, the same as a kitchen counter, suits most standing work, and hand work goes better at thirty-four. If a miter saw is in the plan its own table sets the height, so the top drops at the saw station and the bench either side becomes outfeed for long boards.

Twenty-four inches of depth is plenty for a bench you work on, thirty if a machine lives on it. Let the top overhang the cabinet face by an inch or two, because a top flush to the face frame cannot be clamped at all.

Drawers under a bench get full-extension ball-bearing slides in a heavier grade than a kitchen run uses, and the rating belongs on the drawing, because it is not something you change later. Three shallow drawers of wrenches stay sorted where one deep drawer becomes a bin. One cabinet gets a real lock for solvents, blades and the nail gun, mounted high.

Outlet heights get settled before a box is hung, because an outlet at baseboard height disappears behind a bench and a strip along the back of the work surface is what gets used. A compressor or a table saw puts that circuit in an electrician’s hands.

Will the doors still close in February?

If they are overlay doors with a deliberate gap, yes. Wood moves across its grain as humidity changes, and an unheated garage hands it the widest swing of any room in the house. Overlay doors sit on the face of the box and have room to move. Inset doors, fitted into their openings with a hairline reveal, are the ones that bind.

So a garage run gets built overlay even in a house where the kitchen is inset, with reveals a touch wider than the shop standard for interior work, and drawer fronts follow the same rule.

The floor is a separate problem. Garage slabs are poured with a pitch toward the overhead door, so a base run along a side wall stands on a floor that falls away across its length. Level comes from the cleat and the legs, and the toe kick gets scribed to whatever the concrete is doing.

European cup hinges adjust in three directions with a screwdriver, so a garage run gets a two-minute tweak at the turn of a season.

How do you plan the wall when the car has to fit?

Measure with the vehicles inside and their front doors open, not with an empty bay. Tape on the floor at the swung door edge and at the mirror line gives you the real wall, and it sits well inside the wall the tape measure says you have.

What that line leaves decides the rest:

• A 24-inch base run takes two feet off the bay. In the narrow detached garages and single-width bays common in older Fremont neighborhoods, that can be the whole conversation.
• Where depth is short, 12 to 16-inch uppers over the hood and trunk zones still hold most of what a garage stores. Full depth goes on the end wall, where no car door ever swings.
• Heavy things live between knee and shoulder height, seasonal and light goes above head height, and nothing goes where the corner of an opening car door can reach it.
• Check the overhead door before anything is fixed. The open panel and its track occupy the ceiling plane and the opener rail runs down the middle of the bay, so a tall cabinet can clear the wall and still catch the door going up.

Closed doors matter more here than they look like they should. On an acreage off a gravel road out toward Hooper or North Bend, open shelving in a garage is a dusting chore with no end.

If you can only build one wall this year, which one?

The bench wall, if you work in the garage. The wall beside the house door, if the garage is mostly where the household lands on its way in. Those are different problems and the answer follows the traffic rather than the square footage.

The bench wall pays back as soon as it exists, because a work surface at the right height is what gets projects and half-done repairs up off the floor, and clear floor makes the rest of the garage easier to plan.

The wall by the house door wins when the real complaint is the pile inside the entry. Sizing an entry locker wall is its own subject, with its own bay math and a bench built to sit on. The garage version is a work surface at standing height with storage under it.

Whichever goes first, stub for the second while the walls are open: the ledger run full length now, next year’s outlet boxes set with this year’s, and the door style, wood and finish formula written down so the second wall matches the first. A garage run prices by the linear foot the way a kitchen does, so the second wall is priced on the same basis. Our published cost ranges are the starting point, and the number for your garage comes in writing after we measure the bay with the car parked in it.