Cinder Block Bench: DIY Outdoor Seats

Elevate your outdoor living space with a functional and stylish DIY cinder block bench. This versatile structure not only provides extra seating but also adds a unique, rustic charm to your garden, patio, or balcony. With minimal costs and simple materials, constructing this bench is an accessible project for both beginner and experienced DIY enthusiasts. Let's explore the steps to build your own outdoor cinder block bench.

Cinder blocks, often overlooked as a building material, offer surprising versatility and durability. They're inexpensive, easily available, and withstand the elements, making them ideal for outdoor projects like this bench. By stacking blocks creatively, you can create a sturdy, robust structure that will serve you well for years to come.

The Anatomy of a Cinder Block Bench

A simple cinder block bench consists of a base, seats, and backrests. By arranging the blocks in creative patterns, you can shape the bench to fit your precise needs and aesthetic preferences.

In this guide, we'll build a basic linear bench with a backrest. However, the principles can be applied to create cozy corner seats, lounge-style benches, or even built-in bench-borders for your garden beds.

Choosing the Right Cinder Blocks

For an outdoor bench, standard 8-inch narrow cinder blocks are the most affordable and widely available choice. They provide good stability and allow for efficient use of materials. Ensure the blocks are in good condition with no cracks or damage.

Consider using "hollow" blocks for this project, as their empty cores reduce weight and allow for easy integration of wooden planks or cushions for added comfort.

Materials and Tools Needed

Besides cinder blocks, you'll need basic tools and a few supplementary materials:

• Gallon of waterproofing sealant (e.g., concrete sealer or paint)
• Concrete adhesive or landscape bonding glue
• Level and rubber mallet
• Tape measure and marker
• Gloves and safety glasses

Assembling the Bench Frame

Start by preparing your site. Ensure the surface is flat, stable, and well-draining to prevent water accumulation and ensure bench stability.

Begin with the base: lay a full, solid layer of cinder blocks (leaving no gaps) both lengthwise and widthwise. This solid foundation will support the weight of the bench and provide stability.

Building the Seat and Backrest

Next, stack another layer on top of the base using a running bond pattern (staggering the blocks like bricks) to create the seat. You can adjust the height by using full, half, or quarter blocks. For a comfortable, adult-sized seat, aim for about 18-20 inches.

To create the backrest, stack another layer directly on top of the seat, using full or half blocks depending on your desired backrest height. Ensure the top layer is stable and even.

Securing the Bench

Use concrete adhesive or landscape bonding glue to secure the blocks together. Apply the adhesive liberally on the outer three-quarters of the joints between the blocks. This will provide extra strength and stability.

Allow the adhesive to set according to the manufacturer's instructions. Then, waterproof the bench using a concrete sealer or exterior paint. This will protect the blocks from moisture and prolong their lifespan.

Customizing Your Cinder Block Bench

Once the bench is secure and waterproofed, you can customize it with various finishes and features:

Added Comfort

Install wooden planks or slats across the seat and backrest for added comfort. Secure them using concrete screws or lag bolts. Alternatively, use thick padding and outdoor cushions.

For a softer look, consider rendering or stuccoing the bench with a thin layer of concrete or mortar to create a smooth, seamless surface. Use a trowel or float to achieve your desired finish.

Integrating Planters

Create built-in planters by removing a few inner blocks from the bench and lining the hollow cores with landscape fabric. Fill with potting soil and plant your favorite flowers, herbs, or even dwarf trees.

With a bit of creativity and some elbow grease, you can transform simple, affordable cinder blocks into an elegant, functional outdoor bench that enhances your living space. Happy building!