Browse » home» Shed Foundation Plans & Construction Guide

---

Shed Foundation Plans & Construction Guide

Building Your Shed: A Foundation Guide from Start to Finish

So, you're ready to build a shed! That's awesome. A shed is a fantastic addition to any property, providing extra storage, a workshop space, or even a cozy potting shed. But before you start hammering nails, you need a solid foundation. This guide will walk you through planning and constructing a shed foundation, making the process straightforward and less daunting.

Choosing the Right Foundation: It's All About the Soil and the Shed

The type of foundation you need depends heavily on two things: the soil type where you're building and the size and weight of your shed. Think of it like this: a tiny garden shed doesn't need the same heavy-duty support as a large workshop brimming with tools and machinery.

Assessing Your Soil: The Great Ground Investigation

Before you even think about concrete, get to know your soil. Is it sandy, clay-like, rocky, or something in between? Dig a few test holes – about a foot deep – in the area where you plan to build. This will give you a good idea of what you're dealing with. Clay soil can be tricky, as it can swell and shrink with moisture changes, potentially causing problems later on. Sandy soil, on the other hand, is usually pretty well-drained. If you encounter bedrock or lots of large rocks, you might need to adjust your plans. You can even take a soil sample to a local agricultural extension office for a more thorough analysis if you are unsure.

Matching Foundation to Shed: Size Matters!

For smaller sheds (under 8ft x 8ft), a simpler foundation might suffice. For larger or heavier sheds, a more robust foundation is a must. Let's look at some common options:

• Gravel Base: Simple, cost-effective, and ideal for smaller, lightweight sheds on well-drained soil. Essentially, you're creating a level bed of compacted gravel.
• Concrete Slab: A popular choice for its durability and strength. Perfect for larger sheds and those that will be subject to heavier loads.
• Pier and Beam: This involves setting concrete piers (or blocks) into the ground and then framing a floor system on top. It's a good choice for sloped or unstable ground.
• Wooden Sleepers: Treated wooden sleepers can be laid directly onto the ground, but they are only suitable for small sheds in well-drained areas. This approach is more susceptible to rot and requires careful consideration of ground level and water run-off.

Planning Your Foundation: Measuring Twice, Building Once

Accurate measurements are crucial. Get out your measuring tape and make sure you have the exact dimensions of your shed. You'll need to know the length, width, and even the height of the foundation itself, consider that it needs to be a bit bigger than the actual shed footprint to create a stable base.

Leveling the Ground: A Foundation's Best Friend

A level foundation is paramount. Use a spirit level and a shovel to remove or add soil as needed to achieve a perfectly flat surface. Remember, you're building on this, so slight imperfections can be magnified throughout your project. Taking time to level the area will save you significant time and frustration later. Consider renting a laser level for larger projects – it's a huge time saver and ensures perfect accuracy.

Constructing Your Chosen Foundation: Let's Get Building!

Now for the hands-on part! The specific steps will vary depending on the type of foundation you've chosen, but here's a general overview:

Gravel Base Construction

1. Dig out the area to the desired depth (usually around 4-6 inches).
2. Compact the soil firmly using a tamper or heavy plate compactor.
3. Lay down a layer of landscaping fabric (this helps prevent weed growth).
4. Add a layer of gravel (about 4-6 inches), compacting it thoroughly.
5. Level the gravel using a rake and a spirit level.

Concrete Slab Construction

1. Dig out the area to the desired depth (typically 4-6 inches) and make sure it is appropriately sized.
2. Create a formwork using timber or metal edging to contain the concrete.
3. Add a layer of compacted gravel and level it. This provides better drainage and a stable base.
4. Lay down a layer of plastic sheeting within the formwork to prevent moisture loss from the concrete.
5. Place reinforcing mesh (rebar) over the base. This adds significant strength to the slab.
6. Pour and level the concrete.
7. Use a concrete vibrator or screed to consolidate the concrete and eliminate air pockets.
8. Allow the concrete to cure completely (usually several days) before proceeding.

Pier and Beam Construction

1. Dig holes for the piers (the depth will depend on your soil conditions).
2. Set concrete piers or blocks in the holes, ensuring they are level.
3. Allow the concrete to cure completely.
4. Construct a wooden frame on top of the piers to support the shed floor.

Important Considerations

Building Permits: Check with your local council to see if you need a building permit for your shed. Regulations vary depending on your location and the size of the shed.

Drainage: Ensure your foundation has adequate drainage to prevent water from accumulating around your shed.

Pest Control: Use treated timber where appropriate to prevent rot and insect infestation.

Weather Conditions: Avoid building your foundation during extreme weather conditions.

Commonly Asked Questions

• Q: How deep should I dig for my foundation? A: The depth depends on your soil type and the size of the shed. For most smaller sheds, 4-6 inches is usually sufficient, but you may need to go deeper for heavier sheds or poor soil conditions.
• Q: What type of concrete should I use? A: Use a ready-mix concrete designed for foundations. The specific mix will depend on the size and weight of your shed.
• Q: How long does the concrete need to cure? A: Allow the concrete to cure for at least 2-3 days before building on it. Longer is better, especially in cold or humid conditions.
• Q: Can I build the shed foundation myself? A: Yes, many people build their shed foundations successfully on their own. However, if you are unsure about any aspect, it's always best to seek professional advice or hire a contractor.
• Q: What tools will I need? A: You'll need a shovel, measuring tape, spirit level, possibly a tamper or plate compactor, and formwork materials (for concrete slabs). For concrete work, you'll also need a wheelbarrow and possibly a concrete mixer.

Remember, safety first! Always wear appropriate safety gear, including gloves, safety glasses, and sturdy footwear. If you're not comfortable with any aspect of the construction, don't hesitate to seek help from a qualified professional. Good luck, and happy building!