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The building regs for a log burner hearth J, page 37, section 2.24b: Constructional hearths should be made of solid, non-combustible material such as concrete or masonry, at least 125mm thick, including the thickness of af any non-combustible floor and/or decorative surface. Is PIR foam 'solid, non-combustible' ? Sure I know it is not like concrete but my stove is stated as not heating the hearth beyond 100degC so the manual states a 12mm only hearth is needed (though I fear that is for a non-recessed fireplace according to BR) and I'll have a 55mm screed and a 70mm decorative slate hearth above the PIR foam anyway. Otherwise I'll need to remove 100mm of the 200mm sub-floor PIR foam, add in a 100mm constructional hearth, top that with 55mm screed and a Xmm decorative hearth with a 90kg (empty) stove on top - that is quite a lot of weight on 100mm of PIR foam - will 100mm PIR foam cope with all weight that? Paul