Blocks of Pinus radiata D. Don were treated to 12 retention levels with CCA and NaPCP. These were exposed for 12 weeks in agar jars to the dry rot (brown rot) Serpula lacrymans (Schum. ex Fr.) S.F. Gray. After mass loss determination, the same blocks were tested for reduction in compression strength parallel to the grain. Using both these parameters, together with interpolated 6 week strength loss data, toxic values (in accordance with the Polish standard procedure) and toxic limits (in accordance with the British standard) were calculated. The differences between efficaceous and non-efficaceous retentions of the two preservatives was greater for strength reduction data than for mass loss data. Reconsideration of the use of compression strength, as an alternative to mass loss measurements, is recommended

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