How to Build Raised Garden Beds With Corrugated Metal

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There's nothing better than walking outside and picking the sweet fruits and vegetables from your own garden in your own yard. With this corrugated metal raised garden bed, you get the best of both worlds — the wonderful garden function and a beautiful addition to your yard. What could be better?

(Image: Photograph by Shayna Orrino)

Things You'll Need

  • 2 x 6 x 10' cedar boards
  • 2 x 6 x 8' cedar boards
  • 4 x 4" x 10' cedar post
  • Tape measure
  • Table saw
  • Sliding compound miter saw
  • Drill with twist bits and screwdriver bit
  • Pencil
  • Framing square or speed square
  • Hammer
  • Chisel
  • Corrugated metal, new or old
  • Grinder or circular saw with metal-cutting blade
  • 3 1/2 inch deck screws 
  • 1 1/2 inch self-tapping screws
  • Landscaping fabric
  • Scissors
  • Soil

Step 1: Determine Box Size

Depending on the size of the area you have available, choose an overall length and width for your garden box. Ours is 4-feet wide x 8-feet long x 21-inches tall. The size of your box will determine how much lumber you need. Cedar is great wood choice for outdoor projects, since it is naturally resistant to rot and insect damage.

Tip

  • Don't make your garden box too wide, or you won't be able to reach the middle of the box from either side.

Step 2: Build the Bottom Frame

To start, begin building the frame of the garden box. Because we purchased 2 x 6 boards, we had to rip down the bottom board of the box in half lengthwise, using a table saw.

(Image: Photograph by Shayna Orrino)

With the wood ripped down, cut two side boards 8 feet in length and two end boards at 4 feet in length, mitering the ends at 45 degrees, using a miter saw. Lay out the pieces to create a rectangle shape, as shown here.

(Image: Photograph by Shayna Orrino)

Drill pilot holes at the corner joints, using a 1/8-inch twist bit. The pilot holes will prevent the wood from splitting when you drive screws.

(Image: Photograph by Shayna Orrino)

Then use two 3 1/2 inch deck screws to secure each corner.

(Image: Photograph by Shayna Orrino)

Follow the same pattern on all four corners to create a sturdy bottom frame.

Step 3: Cut & Notch the Corner Posts

Now you will create the four corner posts for your raised bed. For a cleaner look and sturdy construction, we opted for a design that will mortise the top and bottom frame into notches cut into the 4 x 4 posts. Begin by cutting four corner posts from the 4 x 4s at 18 1/2 inches in length.

(Image: Photograph by Shayna Orrino)

Now, cut the notches where the 2 x 6 top rails will fit into the posts. Use a 2 x 6 board as a template to outline the notch on the post. Remember that a 2 x 6 board is actually somewhat smaller than those nominal dimensions — 1 1/2 inches x 5 1/2 inches, which will be the size of your notches.

(Image: Photograph by Shayna Orrino)

With the rail outline drawn on the post, use a miter saw to make the necessary cuts, down to the depth of the outlines. The saw won't go all the way through the block, but it will cut deep enough along the outline to allow you to knock out the corner and finish the notches with a hammer and chisel.

(Image: Photograph by Shayna Orrino)

With the corner piece cut, pull out the separated wood.

(Image: Photograph by Shayna Orrino)

This is what it will look like:

(Image: Photograph by Shayna Orrino)

For a clean, smooth square corner, use a hammer and sharp chisel to cut out the remaining wood and square off the notches. The notch needs to be perfectly smooth and square to allow the top rails to fit.

(Image: Photograph by Shayna Orrino)

Next, cut the notches for the lower bottom rails. These are made from smaller lumber pieces, so they will require smaller notches. Use the bottom frame pieces as guides to mark your notches at the bottom of the posts, then cut and finish the notches in the same manner you used for the top notches.

(Image: Photograph by Shayna Orrino)

Again, use the saw to score the wood along the outline.

(Image: Photograph by Shayna Orrino)

Use the hammer and chisel to remove the corner and square off the notches. When both sides are notched, you'll be left with this:

(Image: Photograph by Shayna Orrino)

Tip

  • Use the first corner post as a guide to mark the rest of our posts. The marking process will go much faster this way.

(Image: Photograph by Shayna Orrino)

Step 4: Add the Corner Posts to the Bottom Frame

With the corner posts cut and notched, begin attaching them to the bottom frame.

(Image: Photograph by Shayna Orrino)

Position the first post upright on one corner of the bottom frame so the notches fit tightly over the frame. Use a square to make sure each corner is straight and square to the frame.

(Image: Photograph by Shayna Orrino)

Drill pilot holes, and use the 3 1/2 inch screws to attach the posts to the the bottom frame.

(Image: Photograph by Shayna Orrino)

Follow the same pattern until all four sides are attached.

(Image: Photograph by Shayna Orrino)

Next, add the side rails. Cut the two 2 x 6 boards to 8 foot lengths, and two to 4 foot lengths, bevel-cutting the ends at 45 degrees (this can done on your table saw or with a sliding compound miter saw). Position the 8 foot-long side boards into the post notches. Drill pilot holes and secure the posts to the rails with 3 1/2 inch screws.

(Image: Photograph by Shayna Orrino)
(Image: Photograph by Shayna Orrino)

Position the 4-foot end rails into the notches, then drill pilot holes and secure them to the posts with screws.

(Image: Photograph by Shayna Orrino)

Add the side bracing on the long sides, which will make the frame a little more sturdy. Cut two 2 x 6 boards to 10-inches long. Position them on the long sides, midway between the corner posts. Secure them on the top and bottom frame members with 3 1/2 inch screws driven diagonally (known as "toe-nailing") through the side braces and into the top and bottom frame members.

(Image: Photograph by Shayna Orrino)

Step 5: Add the Corrugated Metal

With the frame built, it's time to add the corrugated metal panels to each side. Measure and mark the metal panel for long strips 18 1/2 inches wide.

(Image: Photograph by Shayna Orrino)

Using a grinder or circular saw with a metal-cutting blade, cut the metal strip along the marked line.

(Image: Photograph by Shayna Orrino)

Next, cut the strips to the proper length; in our case, this means two 4-foot lengths for the ends of the planter, and two 8-foot lengths for the long sides.

(Image: Photograph by Shayna Orrino)
(Image: Photograph by Shayna Orrino)

Insert the cut metal pieces into the frame on the inside of the planter. Use care, as the cut metal edges may be sharp.

(Image: Photograph by Shayna Orrino)

Now, use the self-tapping screws to attach the metal to the wood frame. Drilling small pilot holes can make this easier.

(Image: Photograph by Shayna Orrino)
(Image: Photograph by Shayna Orrino)

Make sure to drive plenty of screws into the top and bottom frame and into the side braces to provide plenty of support.

(Image: Photograph by Shayna Orrino)

Step 6: Add the Corner Blocks

Because the metal doesn't perfectly line up straight on each corner, it may leave the edges with a slight gap. Use a piece of cedar, ripped down to 1 1/2 inches x 2 inches to reinforce the ends of the panels. Screw small boards on both sides of each corner — a total of eight strips.

(Image: Photograph by Shayna Orrino)

Tip

  • While this step certainly makes the box look more finished, it's not essential to the overall build. If your metal creates a nice corner edge, feel free to skip this step.

Step 7: Fill with Dirt

Now, you can move the planter into its final position and begin filling the box with dirt. Because the old corrugated metal we used had a few minor holes and rust spots, we used landscaping fabric to line those areas:

We simply cut the fabric to size...

(Image: Photograph by Shayna Orrino)

Placed it in the box, and pushed the dirt up against the fabric...

(Image: Photograph by Shayna Orrino)

And continued filling the boxes to the desired height.

Tip

  • You can use any soil or dirt you like, but for best growing, it's recommended to use a packaged container soil mixture, or a mixture of top-soil and organic material, such as peat moss or compost.

(Image: Photograph by Shayna Orrino)

Step 8: Add the Top Cap

This step could easily be done before adding the dirt, but we decided to add the cap last. Not only does it nicely frame out the top of the box, but it also adds a nice ledge.

For the cap, we used 2 x 6 cedar boards, 10-feet long. We wanted the cap to hang over the actual frame of the box, so we added an extra 2 inches to the frame, cutting each corner piece at a 45-degree miter.

(Image: Photograph by Shayna Orrino)

Drill pilot holes, then drive screws to secure the top cap to the frame.

(Image: Photograph by Shayna Orrino)

We used several screws on the top, the sides, and the corners to firmly secure the cap.

(Image: Photograph by Shayna Orrino)
(Image: Photograph by Shayna Orrino)

Once all of the boards were installed and screwed in place, we were left with this:

(Image: Photograph by Shayna Orrino)

Step 9: Add Plants & Enjoy!

The final step is adding your plants and seeds!

(Image: Photograph by Shayna Orrino)

Tip

  • Don't forget to add any soil amendments to if necessary!

Enjoy your new garden box!

(Image: Photograph by Shayna Orrino)
(Image: Photograph by Shayna Orrino)

Not only is it a practical addition, but it's also beautiful.

(Image: Photograph by Shayna Orrino)

For maximum impact, build more than one to give a nice, cohesive look to your yard.

(Image: Photograph by Shayna Orrino)

Enjoy, enjoy! And don't forget, this project can easily be customized to fit your space requirements and your garden type! Happy gardening!

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