How to Build a DIY Cinder Block Bench A Complete Guide

Cinder block benches have become an increasingly popular option for those looking to create simple, durable, and cost-effective outdoor furniture. Not only are they functional, but they also offer a customizable and unique design that can suit any garden, patio, or backyard. This article will provide a comprehensive guide on how to build your own cinder block bench, including the materials you’ll need, design tips, and the steps to follow.

Why Choose a Cinder Block Bench?

Before diving into the construction process, it’s important to understand why a cinder block bench might be the perfect choice for your outdoor seating needs. Here are some key reasons to consider building one:

Cost-Effective

Cinder blocks are relatively cheap, especially compared to the cost of pre-made outdoor furniture. A DIY cinder block bench can be a fraction of the cost of buying a traditional bench or patio seating.

Durability

Cinder blocks are designed for structural uses, meaning they can withstand significant weight and weather conditions. If you’re looking for furniture that will last through various seasons, a cinder block bench is a durable choice.

Customizable Design

With a DIY cinder block bench, you can tailor it to fit your aesthetic and space requirements. You can adjust the length, height, and even the color to suit your garden or patio design. The use of wood or cushions adds to the customization potential.

Simplicity of Construction

Building a cinder block bench requires only basic tools and minimal expertise. Whether you’re a seasoned DIYer or a complete beginner, this project is straightforward and can be completed in a single day.

Planning Your Cinder Block Bench

Location

The first step in building a cinder block bench is determining where you want to place it. Since cinder blocks are heavy, it’s best to choose a permanent or semi-permanent location. Ensure the area is flat, stable, and can support the weight of the blocks.

Consider positioning the bench in a shaded area of your yard or patio, or near a garden where you can enjoy the scenery. You could also place it around a fire pit for a cozy, communal gathering spot.

Design and Dimensions

Cinder block benches can vary in design depending on your personal preferences. A standard cinder block bench typically includes a row or two of cinder blocks stacked as supports, with wooden beams placed through the holes to form the seating surface.

Determine the dimensions of your bench, taking into account the number of people you want to accommodate. The length of your bench can be adjusted by the number of wooden beams used. For example, a bench that comfortably seats three people would require around three to four wooden beams, each measuring around 4 to 6 feet in length.

The height of the bench can also be adjusted by stacking cinder blocks. Typically, two stacked cinder blocks are enough to create a comfortable seating height. However, if you prefer a higher or lower bench, you can modify this as needed.

Materials Needed

To build a basic cinder block bench, you’ll need the following materials:

  • Cinder Blocks 

For most benches, you’ll need between 8 to 16 cinder blocks, depending on the design and size of the bench.

  • Wooden Beams or Planks 

Choose sturdy wood like pine, oak, or cedar. The wood should be treated for outdoor use to prevent damage from moisture and insects.

  • Adhesive 

Use strong construction adhesive to secure the blocks if you want added stability.

  • Outdoor Paint or Sealant

If you want to paint the blocks or protect them from the elements, consider outdoor-grade paint or sealant.

  • Sandpaper and Stain (Optional) 

If you want to stain or smooth the wooden beams, sandpaper and outdoor stain will be necessary.

  • Cushions or Padding (Optional) 

 For added comfort, you can place outdoor cushions on the wooden seat.

Step-by-Step Guide to Building a Cinder Block Bench

Now that you have the materials and a plan in place, it’s time to build the bench. Follow these steps to ensure a sturdy and visually appealing result.

Step 1: Preparing the Location

Before placing the cinder blocks, ensure the location you’ve chosen is clear of debris, weeds, or uneven ground. If necessary, level the ground using a shovel or a rake. You can place a layer of gravel or pavers under the bench for extra stability.

Step 2: Arranging the Cinder Blocks

Begin by placing the cinder blocks on the ground in the position you want them. Depending on the height of your bench, you can stack two blocks on top of each other for each support. Position the blocks so that the holes are facing outwards, as these will hold the wooden beams in place.

If you want a longer bench, use additional sets of blocks to support the weight of the beams. For example, a six-foot bench may require three sets of supports, spaced evenly along the length of the wood.

Step 3: Inserting the Wooden Beams

Once the cinder blocks are arranged, insert the wooden beams through the holes in the blocks. The beams should be long enough to sit securely inside the blocks with an equal amount of overhang on both sides.

Ensure the beams are level and stable before proceeding. If the beams are too loose, you can use construction adhesive to secure them inside the cinder blocks for added stability.

Step 4: Sanding and Staining the Wood

If you want to add a finishing touch to the wooden beams, you can sand them down using medium-grit sandpaper to smooth out any rough edges. After sanding, apply an outdoor wood stain or sealant to protect the wood from moisture and UV damage.

Let the stain or sealant dry completely before moving on to the next step.

Step 5: Securing the Cinder Blocks (Optional)

If you want to ensure that the cinder blocks don’t shift or move, you can apply construction adhesive between the stacked blocks and at the base. While this step isn’t strictly necessary for a basic cinder block bench, it can provide extra durability and stability, especially if the bench will see a lot of use.

Step 6: Painting or Sealing the Cinder Blocks (Optional)

For an added touch of customization, consider painting the cinder blocks. Use outdoor-grade paint in a color that complements your garden or patio decor. Make sure the paint is suitable for masonry and weather-resistant to avoid fading or peeling over time.

Alternatively, if you prefer the natural look of the blocks, apply a masonry sealant to protect them from moisture.

Step 7: Adding Cushions or Padding

While the bench is functional without cushions, adding outdoor cushions or padding can make the seating more comfortable. Choose cushions made from weather-resistant fabric to withstand outdoor conditions.

If you want to go a step further, you can even sew custom cushions to match your outdoor decor. Velcro straps or ties can be added to the cushions to keep them securely in place on windy days.

Design Ideas and Variations

One of the best aspects of building a cinder block bench is the flexibility in design. You can easily customize the bench to fit your style or the overall theme of your outdoor space. Here are a few creative ideas for taking your cinder block bench to the next level:

L-Shaped Bench

Instead of a straight bench, create an L-shaped seating area using additional cinder blocks and wooden beams. This design is ideal for creating a cozy corner space, perfect for gathering around a fire pit or outdoor dining area.

Double-Sided Bench

For a more communal setting, you can build a double-sided bench by placing cinder blocks in the middle and adding beams on both sides. This design allows people to sit on either side of the bench, making it ideal for larger gatherings or parties.

Built-In Planters

Turn your cinder block bench into a multi-functional piece by incorporating planters. Simply leave a few cinder blocks empty (without beams) and fill the holes with soil and plants. You can plant flowers, succulents, or even herbs for a functional and decorative touch.

Painted Patterns or Stencils

Personalize your bench by painting patterns, stencils, or even murals on the cinder blocks. Use outdoor acrylic paints to create designs that complement your outdoor space, whether it’s a geometric pattern, floral design, or something abstract.

Storage Space

If you need additional storage, you can use the empty spaces in the cinder blocks for storing small outdoor items like gardening tools, blankets, or firewood. Stack the blocks with the holes facing outward, and place the items inside for easy access.

Maintaining Your Cinder Block Bench

One of the best things about a cinder block bench is that it requires minimal maintenance. However, a few steps can help prolong its lifespan and keep it looking great for years to come.

Clean Regularly

Dust and dirt can accumulate on the blocks and wooden beams, especially if the bench is placed near a garden or in a high-traffic area. Simply use a hose or a damp cloth to wipe down the surfaces every few weeks.

Reapply Sealant

If you’ve used wood stain or sealant on the beams, check them regularly for signs of wear. Reapply the sealant or stain every year or two to protect the wood from moisture and prevent cracking or warping.

Check for Stability

Over time, the cinder blocks may shift slightly due to ground settling or frequent use. Inspect the bench every few months to ensure that the blocks are stable and level. If necessary, reposition the blocks or add more adhesive for extra stability.

Replace Cushions as Needed

If you’ve added cushions to your bench, make sure they are weather-resistant and cleanable. Store the cushions indoors during extreme weather conditions to prevent fading, mold, or mildew. You may need to replace them every few seasons, depending on wear and tear.

FAQs

What is a cinder block bench?

A cinder block bench is a DIY outdoor seating structure made using cinder blocks as the base or legs and wooden beams or planks as the seating surface. It’s a sturdy, cost-effective, and customizable solution for garden or patio seating.

What materials are needed to build a cinder block bench?

To build a basic cinder block bench, you’ll need:

  • Cinder blocks (usually 8 to 16 depending on the design)
  • Wooden beams or planks (preferably treated for outdoor use)
  • Construction adhesive (optional, for extra stability)
  • Outdoor paint or sealant (optional, for color and weather protection)
  • Sandpaper and wood stain (optional, for smoothing and finishing the wood)
  • Cushions or padding (optional, for added comfort)

How much does it cost to make a cinder block bench?

The cost of a cinder block bench varies based on materials and design. On average, it can cost between $30 to $100, depending on the number of cinder blocks, type of wood, and optional items like paint or cushions.

How many cinder blocks do I need for a bench?

The number of cinder blocks you’ll need depends on the size of the bench. A typical 4-6 foot long bench that seats 2 to 3 people requires about 8-12 cinder blocks. Additional blocks may be needed for longer benches or more complex designs.

What kind of wood should I use for a cinder block bench?

For outdoor use, it’s best to choose weather-resistant wood, such as treated pine, cedar, or oak. These types of wood are durable and less likely to warp or rot when exposed to moisture. Ensure the wood is sealed or stained for added protection.

Can I paint the cinder blocks?

Yes, you can paint cinder blocks. Use outdoor masonry paint that’s weather-resistant to prevent fading or peeling over time. You can also use stencils or patterns to create a decorative look.

Do I need to use adhesive when building a cinder block bench?

Using adhesive is optional but recommended for added stability. Construction adhesive can be applied between the cinder blocks or where the wooden beams meet the blocks to prevent shifting, especially in high-traffic areas.

How much weight can a cinder block bench hold?

Cinder block benches are very strong and can support a significant amount of weight, depending on the number of cinder blocks and the quality of the wood used. A typical bench can easily hold between 500 to 1,000 pounds, but it’s always a good idea to ensure the bench is properly assembled for safety.

Conclusion

Building a cinder block bench is a simple, cost-effective project that can enhance the look and functionality of your outdoor space. With a few materials and basic tools, you can create a sturdy and customizable bench that suits your needs and style. Whether you prefer a sleek, minimalist design or a more decorative, multi-functional piece, the possibilities are endless.

So, gather your materials, roll up your sleeves, and get ready to build a beautiful DIY cinder block bench that will be the centerpiece of your outdoor living area for years to come!

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