Base Requirements For Your Building
All buildings will require a base of some kind. If the site is not level this may require some excavating. If this is the case, always make the site larger than the building to provide airflow around the sides of the building.
Buildings With Timber Floor
These buildings will require a level site. This may be of earth, stone, concrete or tarmac. Generally, only purpose built concrete pads will be perfectly level. If the site has a small slope of less than 40mm per metre, need to supply heavy timber bearers to form a level platform. These will be set level with the use of packing where necessary. Sites that slope more steeply should be levelled first.
Larger buildings should have a stone or block base. The stone should be of 40mm scalpings. Blocks should be 100mm thick laid on the flat side. A purpose made concrete pad could also be considered.
Buildings Without Timber Floor
Garages and stores, which do not have a timber floor, will be bolted down using sleeve anchor fixings. These buildings will require a level concrete pad which is 10mm less, in size, than the footprint of the building. In this way the shiplap cladding will pass down over the side of the base, while the sole plate (bottom rail) of the wall is bolted to the concrete.
- The pad should be at least 100mm deep and a damp proof membrane should be installed under the concrete.
- The base must be at least 75mm above the surrounding ground to ensure that water is kept out and the timber remains dry.
- Any ramp for vehicles should be kept 40mm below the floor level of the base. This will allow the doors to pass down below the floor level by 20mm to keep out the rain.