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Floating Vanity Countertop[8/4 Wide · 4ft · 5-Pack]
One pack. One build. All 5 boards used. • Makes 1 vanity countertop
Shop Black Walnut 8/4 Wide · 4ft Pack Shop All Speciesselect 4' Lengths / 6-8"
How it goes together
Black Walnut
Hard Maple
Cherry
White Oak
Red Oak
Ash
Hickory
Ambrosia Maple
Sapele*
Padauk*
Purpleheart*
*Exotic — not available for shipment to US customers.
A solid hardwood vanity top for a vessel sink, floating on steel brackets. Four wide 8/4 boards edge-glue into a 42" × 22" top, and board 5 glues under the front edge so it reads a full 3½" thick. Sealed on every face and screwed down through slotted holes, it handles a bathroom's water and humidity.
Quick Build — for experienced woodworkers
| Part | Qty | From | S2S size |
|---|---|---|---|
| Top pieces | 4 | Boards 1–4 | 42" × 5½" × 1¾" |
| Front apron | 1 | Board 5 | 42" × 5½" × 1¾" |
Top: boards 1–4 edge-glued (2 + 2, then the halves) → 42" × 22" × 1¾" (about 21½" after jointing). Waterproof glue.
Apron: board 5 face-glued flat under the front edge, long grain to long grain → 3½" thick at the front.
Mounting: 2–3 heavy-duty floating-vanity steel brackets into studs; top screwed down through front-to-back slots with #12 × 1¼" pan-head screws and washers so it can move about ¼".
Sink: drain hole about 1¾", faucet hole about 1⅜" — always follow the sink and faucet specs.
Finished size: 42" W × 22" D (about 21½" after jointing) × 1¾" thick, 3½" at the front. About 45 lb in walnut, plus the sink.
Before You Start
Shopping List
- 1 lumber pack — 8/4 Wide · 4ft (6–8" wide, S2S)
- Waterproof wood glue (Titebond III)
- 2–3 heavy-duty floating-vanity steel brackets, about 15" deep, rated for the top plus sink (with lag screws)
- 8–12 × #12 × 1¼" pan-head screws and washers
- Vessel sink, faucet and drain (to suit — check hole sizes)
- Marine spar urethane, or a thinned epoxy seal plus spar urethane
- Clear kitchen-and-bath silicone
- Sandpaper 120 / 180 / 220
Tools
- Saw for crosscuts (mitre saw or circular saw with a speed square)
- Track saw, or circular saw + straightedge
- Jointer, straight-line rip jig or hand plane
- 8 bar clamps, 24" or longer
- Cauls (straight scrap strips)
- Router sled, hand plane or belt sander
- Drill, hole saws (1¾" and 1⅜" typical), step bit or file
- Stud finder, 4ft level
- Random-orbit sander or sanding block
Why S2S only? The 6–8" wide 8/4 boards come S2S: both faces planed, edges rough. Plan on losing about ¼" per edge when you straighten them.
Our sizing assumptions: ⅛" per saw cut · 6–8" wide 8/4 S2S boards trimmed ½" each end and ¼" off each rough edge (5½" clean at the narrowest), planned at 1¾" thick · sizes drawn for the narrowest board in the pack. Wider boards give you a bigger offcut or a wider part — never a shortage.
Step-by-Step
S2S Lumber Pack (6–8" wide)
Surfaced 2 sides — straighten edges first
- 1 Prep the boards. Trim ½" off each end to remove any end checks. Joint one edge straight, then rip the other edge parallel (¼" off each rough edge is our planning allowance).
- 2 Cut the parts. Square one end of each board and crosscut all five at 42". Boards 1–4 make the top and board 5 is the front apron. Lay out the top pieces best face up and flip them until the grain flows across the seams.
- 3 Joint the mating edges. Every edge that meets another must be dead straight. Dry-clamp the top: no light should show along any 42" seam.
- 4 Glue up the top. Glue boards 1 + 2 and boards 3 + 4 into two halves first, then join the halves the next day. Use waterproof glue (Titebond III), cauls at the ends and clamps every 8", alternating over and under. The top ends up 42" × 22" (about 21½" after jointing).
- 5 Flatten and square. A 22" panel is too wide for most planers. Flatten it with a router sled, a hand plane or a belt sander, then trim both ends square with a track saw or a circular saw on a straightedge.
- 6 Glue on the apron. Lay board 5 flat under the front edge, flush with the front and both ends. The grain runs the same way in both parts, so it is a long-grain glue joint. Clamp every 6". The front now reads 3½" thick.
- 7 Cut the sink holes. Mark the holes from your sink and faucet templates — typically the drain centred side to side about 10"–11" from the wall, and the faucet 2"–3" behind the bowl. Bore the drain hole (1¾" for most vessel sinks — check the spec) and the faucet hole (1⅜" typical) with hole saws, halfway from each face so nothing tears out. Ease the hole edges.
- 8 Seal every surface. Sand 120 → 180 → 220. Coat the top, bottom, edges, ends and the inside of every hole with marine spar urethane (3–4 coats on the top) or a thinned epoxy seal followed by spar urethane. Bare wood anywhere near water will swell and stain.
- 9 Mount the brackets. Find the studs and mark a level line for the underside of the top (about 30"–32" from the floor for a vessel sink). Screw 2–3 heavy-duty floating-vanity steel brackets into the studs with the supplied lag screws. Use brackets about 15" deep so they stop short of the apron.
- 10 Fasten the top. Set the top on the brackets with a ⅛" gap at the wall. Elongate the bracket holes front to back into ⅜"-long slots with a file or step bit — the 22" top moves about ¼" across the grain. Pre-drill and drive #12 × 1¼" pan-head screws with washers up into the top, snug but not tight. Fit the sink and faucet, then run silicone along the wall and around the sink base. Reseal the edges around the sink every year.
Why slotted holes? A 22" top swells and shrinks about ¼" front to back with the seasons — more in a steamy bathroom. Screws in slots let it move. Screw it down tight through round holes and it can crack.
Why seal every face? Water gets in through any bare wood, especially end grain and the cut sink holes. Sealing the underside and every hole as well as the top keeps the wood stable and stops it swelling, cupping or turning black around the drain.
Why glue the apron on flat? Its grain runs the same way as the top, so the two move together and the long-grain glue joint stays strong. It doubles the front thickness without a heavy, solid 3½" slab.
Make It Yours
- Soap dish: turn an offcut into a matching soap dish with a few drainage grooves.
- Shelf below: add a single 42" shelf on a second set of brackets for towels (needs a second pack).
- Wall-mount faucet: skip the faucet hole and use a wall-mount faucet for a clean top.
Safety and Care
- Wear eye and hearing protection. Use a push stick for every rip under 4" wide.
- Pre-drill every screw — hardwoods split without a pilot hole.
- Mount into wall studs (or rated anchors sized for the load). Check for wires and pipes before drilling.
- Have a licensed plumber connect the drain and supply lines if you're not sure how.
- The top weighs about 45 lb before the sink. Lift it with a helper and don't sit or lean on it.
- Wear a dust mask when cutting and sanding, especially exotics (padauk, purpleheart, sapele).
Frequently Asked Questions
The 6–8" wide 8/4 pack comes S2S (faces planed, edges rough). Straighten the edges with a jointer, a table saw and a straight-line jig, a track saw, or a hand plane.
Yes, if every face is sealed and the finish is kept up. Marine spar urethane or an epoxy seal keeps water out. Wipe up standing water, and re-coat the edges around the sink each year — that's where water sits.
White oak is the classic choice: it is tight-grained and resists water well. Walnut, cherry and sapele also work with a good seal. Skip red oak — its open pores wick water.
Not with this plan. An undermount sink leaves the cut edge of the top wet all the time. A vessel sink sits on top, so only the drain hole meets water.
Planned offcuts only: about 5" off the end of each board. Use them for a soap dish, a toothbrush block or coasters. All 5 boards go into the top.
A 2ft wide pack makes a 22" × 22" top for a small powder-room vessel sink. Cut boards 1–4 at 22" and board 5 into the apron, and follow the same steps.
