DIY Cinder Block Benches Guide
Looking to add stylish and affordable seating to your backyard patio or garden? Building your own cinder block bench is an easy DIY project that can completely transform an outdoor space. With a bit of planning and elbow grease, you'll have a custom cinder block bench suited to your style and needs in no time.
You'll learn how to choose the right design, gather supplies, prep the installation area, and use basic masonry techniques to stack and secure the cinder blocks. We'll also cover adding the finishing touches like paint, sealants, and decor elements. Let's dive in!
Planning Your Cinder Block Bench Project
The first step is deciding on the specifics for your DIY cinder block bench. Take measurements of the area where you want to install it, and sketch out some initial designs. Here are some key factors to consider in your planning process:
Determine Placement in Yard
Think about where the bench will provide respite or complement your landscaping. Cinder block benches pair well with gardens, flower beds, or under trees. For stability, install on a flat area rather than a slope.
Measure Area and Calculate Materials
Measure the length and width of the space for your bench. Account for extra space needed to access the bench. Calculate the number of cinder blocks required based on the bench size and height.
Choose Bench Design and Style
Decide on a shape for your cinder block bench - rectangular, L-shaped, zig-zag, curved. Determine if you want a backrest, armrests, or side planters. Sketch designs to visualize the finished look.
Gathering Materials for Cinder Block Benches
Once you've settled on a plan, it's time to gather supplies. You'll need standard masonry materials along with wood or metal for the bench seat itself. Here's a checklist of cinder block bench materials:
- Cinder blocks
- Mortar
- Concrete mix
- Gravel or crushed rock
- Sand
- Rebar
- Wood or metal for bench seat
- Paint/sealer
Cinder blocks can be bought from home improvement stores. For a uniform look, stick to one block style and color. Purchase the exact amount calculated in your plans to avoid wastage.
For the bench seat, pressure-treated lumber or aluminum are good options for durability and weather-resistance. Kiln-dried wood works too if you'll be painting the blocks. Allow extra length for securing the seat to the side walls.
Preparing the Installation Area
Prepping the site is key for a stable cinder block bench that lasts. Here are some tips:
Level Ground Space
Clear a level, flat area for installing the cinder blocks. For slopes, you may need to pour a concrete footing or place fill gravel to create a flat pad.
Dig Holes for Support Posts
Mark where the support posts will go and dig holes 12"-18" deep and 6"-8" in diameter. These hold the posts embedded in concrete.
Add Gravel Base
Cover the installation area with a 4-6" layer of gravel. This improves drainage and prevents the bench from sinking into the ground.
Building Your Cinder Block Bench Frame
Now for the fun part - constructing the cinder block frame! Follow these steps:
Arrange Cinder Blocks for Side Walls
Lay blocks end-to-end in the shape of your design. Each row should overlap like bricks. Use a level to keep rows even.
Insert Rebar Pieces
Place rebar dowels in alternating cinder block holes to help reinforce the structure. Leave some holes empty for drainage.
Apply Mortar Between Cinder Blocks
Spread mortar between blocks and smooth with a trowel for stability. Remove excess mortar before drying.
Allow Mortar to Set Before Moving On
Give the mortar at least 24 hours to cure before disturbing the blocks. This prevents weak points in the frame.
Installing Support Posts
With the inner structure complete, it's time to add support posts at the corners and ends:
Set Posts in Dug Holes
Place wood 4x4 posts into the prepared holes. Temporary brace the posts plumb until concrete sets.
Fill Holes with Concrete Mix
Pour dry concrete mix in the holes around the wood posts. Add water and allow curing for 1-2 days minimum.
Allow Concrete to Cure Completely
Fully cured concrete ensures maximum strength. Don't remove braces or add weight before it sets completely.
Adding Bench Seat
You're in the home stretch! Finish up your cinder block bench with these final steps:
Measure Width Between Cinder Block Side Walls
Use a tape measure to determine the exact width needed for cutting the seat to fit snugly.
Cut Wood or Metal to Fit Space
Cut your bench seat material to the measured size. Sand and round over any sharp edges.
Secure Seat to Cinder Block Walls
Use construction adhesive and/or hardware to firmly attach the seat. Ensure it can handle weight without wobbling.
Finishing Touches
Add some style with these optional finishing touches:
Paint or Seal Bench and Seat
Apply exterior masonry paint or sealant to protect the cinder blocks from weathering. Use wood stain on lumber seats.
Add Decorative Elements
Make it your own with colorful cushions, added planters, or stenciling patterns on the blocks.
Maintaining Your DIY Cinder Block Bench
With proper care, your custom cinder block bench can look great for years:
Periodically Check Structural Integrity
Inspect for cracks or weak points in the blocks, mortar, or seat. Make repairs right away.
Re-apply Protective Sealant
Refresh paint or sealant as needed to protect from moisture damage and extend the life.
Repair Cracks in Mortar
Re-tuckpoint any cracks or gaps in mortar joints before water seeps in and causes bigger issues.
Inspiration for Customizing Cinder Block Benches
Looking to make your DIY bench unique? Here are some easy ways to customize:
Add Backrest
Use extra blocks or wood to create a backrest for comfort and support.
Use Creative Cinder Block Patterns
Alternate block direction or lay some blocks sideways for visual interest.
Incorporate Storage Space
Hide a compartment inside by leaving some cinder block holes open but adding a lift-off lid.
Safety Tips for Cinder Block Bench Projects
While working with cinder blocks is straightforward, be sure to keep safety in mind: