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Recommended foundation depths in shrinkable clays A letter from Mr G. A. H. Trollope on 18 January questioned the adequacy of a BRE recommendation on minimum foundation depths on sites without trees in that it did not, in his opinion, allow sufficiently for problems possibly arising because of newly planted trees over the likely lifetime of the property. Letters on 15 March from Richard Driscoll of BRE and from Mr J. S. Tari challenged the practicability of such a requirement, but Mr Trollope received support in his contention from Mr R. E. Hedges (19 April) in that owners, ignorant of the factors involved, would inevitably be very likely to plant trees that could cause trouble. The argument is pursued further by Stan Lawrence, from Brighton, who offers a possible means of overcoming the dilemma: Mr Driscoll and Mr Tari have both presented sound cases proving how uneconomical and unreasonable it would be to introduce the suggested ‘ideal’ proposals of Mr Trollope and Mr Hedges which ensured that all buildings built on shrinkable clays would never be damaged by foundation problems relating to adjacent trees. Verulam