- General access (for delivery of garden building, access to all sides for maintenance and applying wood treatments etc.)
- Surrounding area conditions (Foliage, young trees that may grow in future etc.)
- Natural light (a light area is best of the building is to be used as a workshop for example)
- View from the planned area (for summerhouses etc.)
- Do you intend to run an electrical supply to the building and does it give any implications?
Fenton Portable buildings do not lay bases for any garden buildings, although we do offer additional bearers, base frames and a levelling-when-fitting service. Please contact our office for details on these services.
We do, however, have an independent base layer we can ask to contact you should you read this guide sheet and decide you need someone more qualified to lay your base! This base layer is not affiliated with Fenton Portable Buildings but has worked with us for many years and is also happy to quote you for other general building and garden work.
As mentioned decide where to position the shed in an optimal space, allow enough distance from hedges or fences for easy access to all sides. Using pegs and string to mark out the base 2 inch (5 cm) larger than the area of the building on each side. Finally, a measure diagonal to ensure the area is square.
Strip the topsoil and dig out to a depth of approx. 2.5 inch (7 cm) to accommodate the base. Level the area and remove the pegs.
Mix together one part cement to eight parts building sand for a dry sand and cement mix. Spread this evenly ensuring that the mix sits approx. 4 cm in depth. Now, rake this to a level.
Starting from one corner and working outward, lay the slabs by tapping down on the centre of each slab with a rubber mallet. Using a spirit level, ensure all the slabs are square, level and firmly butted together for a solid base.
The completed base should now be level and square. Do one final check with a long straight edge to check if the base is level from each corner, and also measure the diagonals to finally check the base is square. Brush off any excess dry sand/cement mix, which could hinder the levelling of the shed. The result is a smooth, sound, level base. The perfect foundation for the construction of a garden building.
A concrete base requires 3 inch (7.5 cm) of compacted hardcore underneath the 3 inch (7.5 cm) concrete layer. The base can be level with the ground or raised above it. If it is to be level excavate the top earth to 6 inch (15 cm) to allow for the hardcore layer and 3 inch (7.5 cm) thickness of concrete.
Level the area with a rake and spade and remove the pegs.
Set up levelled formwork. This involves measuring, cutting and fitting timber, to the shape of the base in order to contain the concrete.
Check diagonals to ensure the formwork is square. And also ensure the formwork is level, as this will determine whethery your base is 100% level. Next, spread a layer of well compacted hardcore and cover with a liberal amount of sand.
Spread the concrete evenly and slightly proud of the formwork. This can be then levelled off with a long straight edge of timber resting on the formwork using a sawing motion slowly (as shown below) over the entire surface of the freshly laid concrete.
DISCLAIMER: You should note that this article is a guide only . Fenton Portable Buildings do not take any responsibility for the care or longevity of your buildings other than our standard guarantee. This guide should be followed using all safety precautions, equipment and common sense.
If you are unsure about how to properly lay a flat, level, adequate base then contact us or a tradesperson.