How To Build a Shed Base

We do not recommend that you install a shed or base directly onto grass, as grass is prone to subsidence when something heavy is placed upon it. Subsidence can cause your shed to warp and lose its structural integrity. Grass also readily holds moisture which can creep into your shed and cause damp and other problems.

Our timber sheds should be assembled on a firm and level base to give a good foundation to maximize the longevity of your shed. Without this, your shed can drop out of square, causing doors not to close correctly or roof twisting which may lead to water ingress. An incorrect base is also likely to invalidate any product guarantee.

You should consider the following when deciding where to place your shed base:

  • Ensure there will be access around the shed for installation and maintenance.
  • Avoid overhanging trees and bushes that could come into contact with your shed.
  • Do not build too close to walls or fences; take into account any possible shed roof overhang.
  • Be aware of water drainage in your garden; if it runs towards the likely location of your shed, it could cause water damage.

What size should my base be?

The base for your shed should ideally be exactly the same size as the shed ordered; therefore, for a 10’ x 8’ shed, the base must also be 10’ x 8’.

Which type of base do I need?

A concrete base is the strongest, but also more expensive and time-consuming; but we recommend a concrete base for larger sheds. Our Bases are suitable for all of our sheds and are the easiest to construct.

Install a Timbersheds Base Kit :

Tools Required: spirit level, tape measure, drill, lump hammer.

  1. Lay out the components for your shed base, there should be a separate wooden frame for every shed floor panel.
  2. Measure the timber and mark out the position for the shorter cross bearers and spread out evenly between the larger bearers.
  3. Screw the framework together with the screws provided, having pre-drilled the timber to avoid splitting.
  4. Move the shed base to where you want it to sit.
  5. Use a spirit level to find the highest corner of your base and with a lump hammer drive one of the stakes into the ground in the corner on the inside of the frame.
  6. When the top of the stake is just below the top of the framework, screw the stake to the framework using the screws provided.
  7. Use the spirit level to ensure the base remains level, drive the remaining stakes into the ground in each corner of the base and screw to the framework.
  8. Use the spirit level to ensure the base is completely level and secure to the surrounding ground.

Install a Concrete Shed Base

Tools Required: 90-degree builder’s square, builder’s string, spirit level, wooden stakes to tie string around, fork, shovel, spade, rake, lump hammer, tape measure, hand brush, trowel, gloves.

Materials Required: aggregate/hardcore (10mm to dust), sand and cement mix, paving slabs.

  1. Mark out the base area with string lines in the desired position of your base, using wooden stakes to tie the string to the ground. Use a 90-degree builder’s square to ensure the base is square, or measure the base from corner to corner and check the measurements are equal.
  2. Inside the designated base area dig out the grass to a depth of approximately 150mm.
  3. Start with 75mm of aggregate or hardcore and spread with a rake. Use a plank of wood the same width as the base to pack the aggregate down and make it as flat as possible, using a spirit level to check. Use a lump hammer to help pack it down but hammering on the plank of wood lying on the aggregate.
  4. Remove the stakes and string.
  5. Add lengths of timber around the perimeter of the base, using a tape measure, 90-degree builder’s square, and spirit level to ensure the shuttered base is square and level.
  6. Add 75mm of concrete, ensure it is not too wet or the concrete will not set properly.
  7. Spread the concrete around the shuttering as evenly as possible, pushing into all corners and edges. Keep filling in until the concrete is level with the top of the framework and then smooth it out with a wooden plank.
  8. Once the concrete is dry, you can install your shed.

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