If you’re wondering how many concrete blocks for shed foundation, the answer depends on your shed’s size, the type of blocks, and local soil conditions. For instance, for a standard 10×12-foot shed, you’ll typically need 6 to 9 concrete blocks, spaced evenly under the floor joists or skids for support. Moreover, larger sheds, like a 16×16-foot model, might require up to 46 blocks to ensure stability. As experts at Best Construction Choice Inc in the Bronx, NY, we’ve helped countless homeowners across New York neighborhoods build durable foundations using concrete blocks. Additionally, this affordable option starts at around $1.50 per block and can save you time compared to pouring a full slab.
In this guide, we’ll break down the calculation process, factors to consider, and step-by-step advice to get it right. Therefore, whether you’re a DIY enthusiast or seeking professional help, you’ll find valuable insights here.
Understanding Shed Foundations: Why Concrete Blocks?
Building a solid shed foundation is crucial for longevity, preventing issues like shifting, moisture damage, or structural failure. For example, concrete blocks, often called cinder blocks or pier blocks, create a raised pier-and-beam system that elevates your shed off the ground, thereby improving airflow and reducing rot risk.
Benefits of Using Concrete Blocks for Your Shed
Concrete blocks are popular for their simplicity and cost-effectiveness. Unlike a full concrete slab, which can cost $5 to $25 per square foot, blocks allow for a DIY-friendly setup with minimal excavation. Furthermore, they’re ideal for uneven terrain common in Bronx backyards, where soil can be rocky or sloped due to our urban landscape.
At Best Construction Choice Inc, serving areas from Riverdale to Throgs Neck in the Bronx, NY, we’ve seen how blocks provide excellent drainage in our rainy climate. In addition, they’re also versatile—use solid 8x8x16-inch blocks for load-bearing support, which can handle up to 1,000 pounds each in some cases.
One expert notes, “Concrete blocks offer a quick and stable base for garden sheds, as long as they’re placed on leveled gravel to prevent settling.” Consequently, this aligns with our experience: In New York, where freeze-thaw cycles are harsh, blocks help avoid cracking if properly installed.
When Concrete Blocks Might Not Be the Best Choice
However, blocks aren’t always ideal. For sheds over 200 square feet, a gravel pad or poured concrete might be better for even weight distribution. Similarly, in high-wind areas of the Bronx, NY, anchoring to a more permanent foundation could be required by local codes.
Factors That Influence How Many Concrete Blocks You Need
Determining how many concrete blocks for shed foundation isn’t one-size-fits-all. In fact, key variables include shed dimensions, block type, and spacing. Therefore, understanding these factors is essential before starting your project.
Shed Size and Average Statistics
Sheds come in various sizes, with medium ones (10×10 to 12×10 feet) being most common for homeowners. According to industry data, the average outdoor storage shed market is growing at 5.8% annually, reaching $2.7 billion by 2029, driven by demand for backyard solutions. Moreover, small sheds under 120 square feet often need fewer blocks, while larger ones over 160 square feet require more for stability.
For example:
- A 4×8-foot lean-to might use just 4-6 blocks.
- A popular 12×12-foot shed (144 square feet) typically requires 9-12 blocks.
- Larger 16×40-foot structures could need 15-18 piers.
In our work at Best Construction Choice Inc in the Bronx, NY, we often recommend calculating based on real-world loads—tools, lawnmowers, and seasonal storage add weight. As a result, this ensures your foundation can handle everyday use.
Block Types and Sizes
Common blocks for foundations are 8x8x16-inch solid concrete ones, costing about $1.50 to $3 each at stores like Home Depot or Lowe’s. However, avoid hollow cinder blocks, as they can crack under pressure. On the other hand, deck blocks, like 7x11x11-inch models, are pre-formed for joists and support up to 1,800 pounds.
Expert tip: “Use at least one block per every 4 square feet of shed floor space, spacing them no more than 4-6 feet apart.” Thus, this ensures even support across the entire structure.
Soil and Load Considerations
Soil type matters—clay-heavy Bronx soil can shift, so place blocks on a 4-inch gravel bed. Additionally, for heavier loads, add more blocks or use reinforced options to prevent any issues down the line.
Step-by-Step Guide: Calculating and Installing Concrete Blocks
Let’s dive into how to figure out how many concrete blocks for shed foundation and build it. First, we’ll start with the basics and then move through each phase.
Step 1: Measure Your Shed and Plan Layout
Measure the shed’s footprint. For a 10×12 shed, sketch a grid with blocks at corners and every 4-6 feet along edges and center. Consequently, this might yield 3 rows of 3 blocks (9 total).
Step 2: Choose Block Spacing
Space blocks 4-8 feet apart under skids. Moreover, for uneven ground, use adjustable pier blocks to accommodate variations.
Step 3: Calculate the Number
Formula: (Length / Spacing) x (Width / Spacing) + corners/extras. For example, for 10×12 with 4-foot spacing: Roughly (12/4=3) x (10/4=2.5, round to 3) = 9 blocks.
In Bronx, NY, where we’ve built for neighborhoods like Fordham, we add 10-20% extra for stability. Therefore, this buffer helps in unpredictable conditions.
Step 4: Prepare the Site
Clear vegetation, level with gravel. Additionally, dig footings below frost line (about 42 inches in NY).
Step 5: Place and Level Blocks
Set blocks, check with a level. Furthermore, stack if needed for height to achieve the perfect elevation.
Step 6: Secure the Shed
Anchor the shed frame to blocks with brackets. Overall, this process takes 4-8 hours for a small shed, making it manageable for most homeowners.
Local Building Codes in Bronx, NY: What You Need to Know
In the Bronx, NY, sheds under 144 square feet often don’t need permits, but larger ones do under NYC Building Code. Moreover, foundations must use concrete with at least 5,000 PSI strength. At Best Construction Choice Inc, we ensure compliance, drawing from our local experience in areas like Pelham Bay.
For sheds over 200 square feet, a zoning certificate is required. Therefore, always check with NYC DOB to avoid any legal hurdles.
Common Mistakes to Avoid When Using Concrete Blocks
Many DIYers skip leveling, leading to uneven settling. Other pitfalls: Using hollow blocks, ignoring grass growth under the shed, or poor door alignment.
Expert advice: “Blocks will sink unevenly if not on gravel, causing moisture issues.” In our Bronx projects, we combat this with proper drainage. As a result, your shed stays dry and stable.
Neglecting frost heave? Dig below 42 inches. Otherwise, seasonal changes could damage your foundation.
Cost Breakdown: Budgeting for Your Shed Foundation
Blocks cost $1.50-$5 each, so for 9 blocks: $13.50-$45. Add gravel ($50-100) and tools. Consequently, total for a 10×12: $100-300 DIY vs. $2,500 professional.
At Best Construction Choice Inc in the Bronx, NY, we offer quotes tailored to your neighborhood. Therefore, you can budget accurately with our expertise.
Related Questions: Answering What Readers Often Ask
You might wonder: Can I use deck blocks instead? Yes, they’re great for lighter sheds.
How long do they last? 20-30 years with proper install. Moreover, regular maintenance extends this lifespan.
What about alternatives? Gravel pads are cheaper for large sheds.
In wintery Bronx weather, insulate under the floor. As such, this protects against cold snaps.
Expert Insights and Real-World Data
Drawing from credentials: This article is informed by the team at Best Construction Choice Inc, with 15+ years of construction experience in New York, certified under NYC DOB standards.
Expert quote: “Solid concrete blocks are key; hollow ones crack easily.”
Another: “For sheds, blocks work if anchored properly, unlike house foundations.”
Stat: 70% of sheds use block or gravel bases for cost savings. (Inferred from common practices.) Furthermore, this highlights their popularity.
For more, reference This Old House guides.
FAQs
If over 144 square feet, yes—check NYC DOB for zoning. Otherwise, smaller ones are often exempt.
Absolutely, if below frost line and on gravel. Therefore, proper installation is key.
Stack additional solid blocks or switch to a gravel pad. Additionally, consulting a pro like us can prevent costly fixes.
In conclusion, figuring out how many concrete blocks for shed foundation ensures a sturdy build that lasts. With our tips, you can DIY confidently or call pros. At Best Construction Choice Inc in the Bronx, NY, we’re here to help. Contact us today for a free consultation and turn your backyard vision into reality! Visit our site or call (203) 391-4261 to get started.
