ABSTRACT
The rules of thumb for the maximum height of a wall and the minimum width of the foundation for the four wind exposure zones are shown on the map. Wind exposure zones are based on wind speed distribution across the UK. For the given exposure zone, the rules of thumb for wall height (measure from the lowest ground level to the top of the capping or coping) and the foundation width can be read off, from the table, against the common wall thicknesses. In the absence of other information, intermediate thicknesses can be built to the rules of thumb for the next smallest thickness given. For slopes of between 1 in 10 and 1 in 20, the wall heights given should be reduced by 15%. Rules of thumb may not apply if the wall has any of these characteristics: Structural advice should be sought where any of these conditions apply.
