Deleterious materials

This section deals with potentially deleterious materials, including:

Many materials are perfectly acceptable for use in certain circumstances but not others. It is therefore unnecessary to prohibit their use for all construction - with proper care in the selection and use of these materials there is often no reason why they should not function properly. There are some exceptions of course, and these are outlined within this section.

This section is maintained by Sam Parsons of Trident Building Consultancy.