Материалы за 25.07.2020

If you are planning to build a new extensions, or a new building, and there are trees nearby. Or if you are planning to plant a new tree near existing building and are not sure whether it will affect the existing foundations and cause wall cracking. Then this spreadsheet is what you need.

Building near existing trees (or planting a new tree near existing building) is a very delicate matter and should be carefully dealt with. It is very easy to underestimate reach (influence zone) of trees and if new foundations are not deep enough then this may cause wall cracking etc. Claims due to defects caused by trees are one of the most common in the building industry.

This spreadsheet is a very handy tool that provides answers to these issues. Use it to calculate required foundation depth when building in cohesive ground, e.g. clay, and near existing or proposed trees (or planting trees near existing structure). It includes diagrams and site layout for easier understanding. This makes the spreadsheet very easy to use and follow. Based on Section 4.2 of NHBC standard. A great tool for engineers, contractors and regular house owners.

Features:

A clear and easy to read output (all on a single page);
For broad leafed and coniferous trees;
Up to two trees can be calculated per page;
Calculates required foundation depth up to 2.5m. In some circumstances deeper foundations are required and these should be designed by a structural engineer (as required by NHBC);
Diagrams and site location layout for easier understanding;
Includes an extensive list of tree species and UK locations;
Search for tree by English name or Latin equivalent;
Option to include heave precautions;
Quick summary of utilization factors;
Results are updated automatically as input is changed;
Design is based on NHBC standards: 2016.

More info