DIY Builds
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Does a concrete slab Need a sub base?

You can't lay a concrete base directly onto soft ground, so a hardcore sub-base is essential.

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Every garden needs a shed. It’s the perfect safe, dry storage solution for your gardening equipment, furniture, outdoor toys, BBQs and more. A great shed is also a handsome natural timber addition to your outdoor space, blending beautifully with your lawn, trees, shrubs, flowers and fencing. So, it’s worth taking the trouble to build a shed that’s attractive and sturdy as well as useful — and that has to start with the foundations. Without a firm and level base, your new outbuilding may start its life looking fresh, but it’ll be unusable before long. Alternative types of shed base include timber (aka a portabase), plastic, and paving stones. However, in this article, we’re going to focus on the most reliable option: preparing and pouring a solid concrete slab. You can hire all the tools and equipment you’ll need to lay a concrete base for your shed from the HSS range, so we thought we’d complete the service by providing instructions as well. Here’s our eight-step guide to laying a concrete slab worthy of your new shed-shaped pride and joy.

Step 1: Measure up and mark out

Once you’ve decided on the location, start by marking out the area for the slab. Make it wider and longer than the shed will be, and allow extra space for the formwork — that’s the technical term for the wooden frame that will go around the edge of the area to keep the concrete in place. Drive a wooden peg into the ground at each corner and run a taut length of string between them. Make sure the corners are square by measuring both diagonals. If they’re not precisely the same, you need to adjust.

Step 2: Dig out the base area

Below slab level, you’ll lay a 100mm sub-base and a damp-proof membrane. Therefore, you need to dig a level-bottomed pit 100mm deep. Be sure to remove all grass and other vegetation, stones and debris, then compact the earth. A micro excavator will make light work of the digging.

Step 3: Lay the sub-base

You can’t lay a concrete base directly onto soft ground, so a hardcore sub-base is essential. MOT Type 1 hardcore is the ideal material to choose. It’s the recommended sub-base for laying tarmac on roads and is readily available in jumbo packs from DIY stores and trade suppliers. Once your gravel sub-base is in place, thoroughly compact it using an HSS light vibrating wacker plate. Spread a layer of sand on top to prevent the sub-base stones from puncturing the damp-proof membrane.

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How do you anchor a shed to a wood floor?

How to Anchor a Shed to the Ground Without Concrete Looping a cabled anchor around a ground frame. Looping a cabled anchor over an inside structural member. Bolting a cabled anchor to the outside of the shed. Using large Penetrator anchors under the ground frame for both support (replacing footings) and as a hold-down. More items... •

There are five primary methods for securing sheds to the ground without concrete. Looping a cabled anchor around a ground frame. Looping a cabled anchor over an inside structural member. Bolting a cabled anchor to the outside of the shed. Using large Penetrator anchors under the ground frame for both support (replacing footings) and as a hold-down. Using smaller Penetrator anchors with L-brackets for securing sheds into asphalt and for temporary building installations. The specific method, and the number and placement of anchors, will depend upon shed size, soil conditions, and your preference. If a larger shed needs support as well as hold-down (requires footings), the large Penetrators can provide both functions with the same anchor. The largest (46") can replace poured concrete as an easier, faster, equally effective, and less expensive alternative. For the best holding strength, anchors should be installed at a minimum spacing equal to the depth of the anchor, in order to avoid each other’s “cone of soil” — the region of soil that contributes to an anchor’s holding strength. This applies to both cabled anchors and Penetrator (screw-type) anchors.

Drive rod and sledge or demolition hammer for cabled anchors.

Impact wrench or power take-off (PTO) for Penetrator anchors.

Depending on your preferred method, you’ll need the following tools for installation:

For complete instructions, download the Shed Anchor Installation PDF.

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