A Consulting Engineer’s Notes: #2 - Trees Pt.2
July 25, 2008 Building Defects No CommentsPart 1 discussed tree and soil characteristics. Part 2 will provide examples of the effects of trees on buildings with some guidance on defects and how to spot them. The subject of trees, soil and their influence on properties is complex with much engineering research having been done over the years and still continuing. Let’s look at soil first. The soils, which will not affect foundations within the vicinity of trees, are rocks (igneous) and sands (sedimentary). Rocks can be hard like granite or limestone or soft such as sandstone or chalk. Trees can split rocks but realistically in terms of the average house in UK, this is not a problem. Chalk is an exception because it is generally a soft rock but if a trench is dug in it and it rains, for example, the chalk will dissolve into a clay-like soil. So trees in any of the above soils will not normally affect foundations. Read the rest…
