Bunk Beds
Time was in short supply for me earlier this year, as an impending new baby meant our two
boys had to move into the same bedroom. That s why I tried to buy a bunk bed, although
without any success. I couldn t find anything I liked enough to spend money on. I couldn t
even find a design I wanted to copy. And besides, what kind of a woodworker buys a bed? So
after a few spirited design discussions with my wife, and half a dozen crumpled scale
drawings, a plan emerged. After building the bed, and tucking our boys in it for more than four
months, there s not much I d change. I recommend this plan with confidence.
People who see the bed are surprised to learn it s made almost entirely from construction-
grade 2 x 10s. There s beautiful wood bound for use in house frames, and you ll save money
by redirecting the best of it into your workshop, air drying it and turning it into furniture. The
cost of doing business with this under-appreciated material is access to a jointer, thickness
planer and tablesaw. You can t build this project without these machines, so don t even try.
For more on selecting and drying construction-grade wood, see the sidebar Fine Furniture
From Cheap Wood here.
Start by sorting through the pile of 2 x 10s you carefully selected at the lumberyard, choosing
the best for panels, side rails, legs and leg caps. Rough-cut these longer and wider than
needed, then stack them with spacers between the layers to promote drying. This is called
stickering and you ll be doing it throughout the building process. Don t plane or joint any of
these parts yet and be especially generous when roughing out the layers of wood you ll need
for the legs. You ll want to leave lots of extra width for jointing after lamination. Make each leg
layer 4 1/2" wide at this stage. You ll need this extra width because the legs are long, so it can
take many passes across the jointer to get all three layers even and square.
Start With The Panels
Since construction-grade wood needs time to dry while you re building, I ll lead you through
the preparation of parts in stages. Moving from one group of parts to another as you work
allows wood to cup and twist (as it inevitably will) while you still have the opportunity to do
something about it.
The panels are a prominent part of the bed, so choose and combine grain patterns with care.
This is where artistry comes in. Since the finished panels are about 3/8" thick, you can easily
get two panel parts by splitting 1 1/2" lumber down the middle, on edge. This leaves lots of
extra wood for jointing and planing operations. If you don t have a bandsaw, rip the panel
parts no wider than 4", then slice them in half, on edge, in two passes across your tablesaw.
Splitting thick stock like this naturally reveals striking book-matched grain patterns on
matching parts. This is good stuff, so make the most of it.
Next, spend time at the workbench arranging panel parts so they look their best. Mark the
location of neighbouring pieces, then set them aside to dry for at least three or four days
before jointing and edge gluing. Thin, newly split pieces like these tend to cup as they dry, so
you ll want to let that happen before jointing. I designed the completed panels to be less than
12" wide so they could be milled in any benchtop thickness planer after lamination. Set the
panel parts aside for now.
Bags And Bags Of Shavings
Most of the bunk bed parts are 1 1/8" thick, meaning you ll have to spend hours working with
your planer to mill the 1 1/2"-thick boards down to size. You ll save time if you rough-cut all
stiles, rails, bullnose cap strips, side rail support strips, support boards, safety rails and ladder
parts to width first, instead of running uncut lumber through your planer, and then cutting
these parts. Joint and plane components to 1/8" thicker than final size, then let them sit for a
week with a fan blowing on the stickered pile before milling to final thickness. Keep the parts
in separate groups so you can work on each kind in turn.
Laminate The Legs
The bunk bed legs are thick and long, making them the most troublesome part of the project.
The plans show how each leg has five parts: three hefty internal layers, capped by two face
strips that hide the lamination lines.
Divide the 12 leg layers you cut earlier into four groups: three pieces for each leg. The idea is
to arrange the layers so the outer face of each leg looks best. Mark relative layer locations,
then joint and plane leg layers to 1 1/4"-thick and glue them together. A few wooden hand
screws tightened across the edges of the layers will do wonders to align the parts as the main
clamps draw them together. This saves lots of jointing later.
While the leg layers are drying, cut the leg cap strips slightly wider than listed and plane to
final 3/16" thickness. When the legs are ready to come out of the clamps, joint and plane
them to final size. Glue the cap strips over the sides showing the lamination lines, using as
many clamps as needed for gap-free joints. Plane the excess edging flush with the legs, sand
and rout a chamfer along all edges. The plans show how the joint line between leg and leg
cap disappears if you cut so its edge lands on the joint line.
Back To The Panels
Joint one face of each panel member, then joint an edge, before ripping each piece to wider-
than-final width and jointing this sawn edge. Keep all panel parts grouped, as you arranged
them earlier for best appearance, while dry-fitting the panel parts. When everything looks
good, edge-glue the panels, scraping off excess glue after a few hours when it s half-hard.
As the panels are drying, joint and plane the rails and stiles to final size, then trim to length.
The plans show how the edges of these parts require grooves to house the panel edges.
These grooves also admit floating hardwood tenons that join the panel frames. This is why
the panel grooves extend around the ends of the rails. A wing-cutter router bit in a table-
mounted router is the best tool for cutting these grooves. Take one pass from each side of the
rail and stile parts so the grooves are centred. Aim for a 3/8"- to 7/16"-wide groove, then
plane and trim your floating tenons for a snug fit.
Dry-fit all stiles, rails and floating tenons under clamp pressure to check for tight joints, then
measure the inside dimensions of the frame (to the bottom of the grooves) to determine the
ideal panel size. Make the panels 1/16" smaller than these measurements and plane the
panels to fit nicely within the grooves. Dry-fit the stiles, rails and panels, then assemble the
frame permanently with glue. Give everything a day or two to dry, then joint the outside edges
of the frame parts to level and square them.
Mill the bullnose cap strips on a table-mounted router, then fasten them to the top and bottom
edges of the assembled panel frames using 3/8" fluted dowels. With all the parts of this
project that needed dowelling, I invested in a self-centering drilling jig to help me bore
accurate dowel holes in the panel edges and the ends of the side rails all parts too large to
be bored on my drill press. It worked wonderfully. When the cap strips are glued to the panel
frames, run the edge of the assembly over the jointer again, taking a light cut to level the
sides for a tight fit with the legs. Install 3/8"-fluted dowels across the leg-to-panel joints, dry-fit
under clamping pressure, then join the legs and panel frames permanently. Cleaning glue
squeeze-out from the corner where the legs meet the panel frames would be difficult without
help. I used Waxilit, a glue resist that looks like skin cream. Smear some across the dry-fitted
joints when the joint is reassembled with glue the product prevents the squeeze-out from
bonding to the surface wood. The hardened glue pops off with a chisel.
Refine The Legs And Safety Rails
The plans show how each leg needs counterbored holes for the bed bolts, and two mortises
to house the safety rails for the top bunk. Drilling the holes is easy (just don t do it before
you ve read further), though the mortises demand explanation. I made mine using a router
and flush-trimming bit, guided by the shop-made plywood jig. This creates four identical
round-cornered mortises in the legs that need to be squared by hand with a chisel. Use these
mortises as a guide to plane, rip and joint the safety rails you rough-cut earlier, so they fit into
the mortises sweetly. Complete the rails by sanding, trimming to final
length and routing quirk beads on all four edges. These extend to
within 1 1/4" of the end of each safety rail.
Side Rails, Support Strips And Support Boards
These parts connect the head and foot boards, and support the two twin-size mattresses that
the bed is made for. Mill and trim these parts to final size, then rout quirk beads on all four
edges of the side rails, on one edge of the support strips, and along one edge of the support
boards. The plans show the details, though you re free to use whatever profile you like.
Before you go further, think about mattress size. Although there are supposed to be standard
sizes out there, the variation from brand to brand can be considerable. It s safest to have your
mattresses on hand, then measure them and adjust side rail hole locations in the legs, and
the side rail lengths, to suit. The dimensions and locations I used are for mattresses that are
slightly larger than printed mattress specs.
Drill holes in the legs and side rails for the bed bolts now, then glue and screw the mattress
support strips to the inside edge of the side rails. If I had to build my beds over, I d raise the
support strips 1" higher than where I put them. That s what s shown in the plans. Without an
exceptionally thick mattress, the side rails press into your legs as you roll out of bed. Raising
the mattresses with the higher support strip location solves the problem .
Final Fit And Finish
Test-fit the head and foot boards with the side rails using the bed bolts, but leave the safety
rails off for now. Even if the safety rails fit easily into their mortises, they can be tight when
they come together in the completed bed. Save this wrestling match for final assembly. I
needed an 8' set of pipe clamps to draw the head and foot boards together over the safety
rails as the bed came together after finishing.
Cut, sand and rout the support boards, then test-fit them over the support strips. The plans
show how the corners of the outer support boards need square notches to fit around the legs.
You don t have to fasten them, they just rest loose on the support strips.
When everything looks good, take the bed apart and apply a finish. I chose not to use stain
because it highlights dents and scratches when light, unstained wood shows through the
damaged areas. And that proved a good precaution because Joseph, my two-year old, wasn t
in his bottom bunk more than five minutes before he sunk his teeth savagely into the silky,
hand-rubbed urethane finish I applied.
You Will Need
For the head and foot boards Size Qty.
Legs 3 1/4" x 3 5/8" x 78" 1
Leg cap strips 3/16" x 3 1/4" x 78" 8
Long panels 3/8" x 9 7/8" x 24 1/2" 6
Short panels 3/8" x 9 7/8" x 17 5/8" 6
Long top stiles 1 1/8" x 2 3/4" x 24" 4
Long bottom stiles 1 1/8" x 2 3/4" x 30 3/4" 4
Short top stiles 1 1/8" x 2 3/4" x 17" 4
Short bottom stiles 1 1/8" x 2 3/4" x 23 3/4" 4
Narrow rails 1 1/8" x 2 3/4" x 33" 4
Wide rails 1 1/8" x 4 1/4" x 33" 4
Short floating tenons hardwood 3/8" x 1" x 2 1/4" 16
Stile floating tenons hardwood 3/8" x 1" x 1 3/4" 16
Long floating tenons hardwood 3/8" x 1" x 3 3/4" 16
Bullnose cap strips 1 1/8" x 2 3/8" x 38 3/8" 8
Dowels 3/8" dia. x 1 1/2" fluted 40
For the mattress support assembly
Side rails 1 5/16" x 6 7/8" x 76 3/4" 4
Side rail support strips 1 1/8" x 1 3/4" x 76 3/4" 4
Support rail screws #14 x 2" round head, brass 24
Support boards 1 1/8" x 3 15/16" x 40 7/8" 40
Bed bolts 3/8" dia. x 5"* 8
Bed bolt caps hardwood, 1" dia. domed caps 8
For the ladder and safety rails
Ladder sides 1 1/4" x 4 3/8" x 61 1/2" 2
Main ladder steps 1 1/8" x 5 1/8" x 16 1/2" 5
Safety rails 1 1/8" x 4 1/8" x 78 3/4" 4
Long ladder screws and cup washers #10 x 3 1/2" 2
Short ladder screws and cup washers #10 x 2 1/4" 2
Dowels 3/8" dia. x 1 1/2" fluted 2
*Includes cylindrical brass nuts, Lee Valley #05G17.01
Fine Furniture From Cheap Wood
Where I live, kiln-dried construction-grade 2 x 10s sell for about 70 cents per board foot at
lumberyards. That s less than half the retail price of furniture-grade pine, and the wood is
better in some ways, too. Construction-grade stock is cut from spruce, jack pine or fir trees, all
of which are surprisingly strong and dense for softwood. The quality of wide construction
planks can also be astonishingly high. It s not unusual to see a 12'-, 14'- or 16'-long 2 x 10
that s nearly free of knots. Even planks with big ugly defects often contain lengths of beautiful
wood on each side. Spruce, in particular, is especially striking when it s quartersawn,
revealing closely-spaced growth rings on the visible face. Construction-grade wood makes
great furniture, as long as you choose and handle it properly.
You ll find about half the wood in a given lumberyard pile is good enough for fine work. And
don t be afraid of defects or mechanical damage on otherwise good boards. You ll be planing
and jointing the lumber anyway, so these flaws are irrelevant. Once you get your wood home,
you ll need to dry it to the 6% to 8% moisture content demanded for furniture use. Even
though dry construction lumber has been kiln-dried, don t be fooled. For construction lumber,
kiln-dried means the wood has less than a 20% moisture content. That s enough to prevent
mold growth in transit, but it s far from being dry enough for furniture. As you leave the
lumberyard, grab some of the thin strips of wood that separate planks in the pile. They ll be
thrown out anyway, and they re perfect for separating layers of lumber as you restack them
indoors, in a heated space. This is key; you ve got to store your wood in fully heated, indoor
conditions (preferably during bone-dry winter conditions) or it won t dry enough. An oscillating
room fan directed at the pile will help drop moisture content from 20% to 8% in about a
month. You don t have to wait that long to begin cutting, just be sure the wood is that dry
before final jointing, planing and assembly
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