Originally Posted By: Caoimh?n P. Connell
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I have frequently seen this type of growth. As an Industrial Hygienist, coming at these projects from a different objective, one of the next things I look for is to see if the mycelia from the growth ?bridges? over onto the roof joists (or trusses, or whatever they?re called). If the mycelia bridge the gap, then you know that significant moisture occurred or is occurring at some time after the roof decking was installed. If, on the other hand, the fungal mycelia do not bridge the gap, the colonization has been arrested shortly after the roof decking has been installed, and further colonization is not likely until something changes.
Next, find a nail that penetrates the roof decking in an area of definitive growth and see does the mycelia grow on the wood that was exposed as the nail pressed through the wood. If the mycelia is absent from the ?newly? exposed wood, then you know the roof decking was installed with the colonies already present.
Regarding the ?black mould? comment. The colour of a mould has nothing whatever to do with any inherent toxicity ? the whole ?toxic black mould? thing is a recent creation by the news media and has no basis in science. Pearly white fluffy mould, green mould, blue moulds and pink moulds can all become ?black mould? when the mould dies and oxidizes.
Anyway, just some thoughts?
Caoimh?n P. Connell
Forensic Industrial Hygienist
(The opinions expressed here are exclusively my personal opinions and do not necessarily reflect my professional opinion, opinion of my employer, agency, peers, or professional affiliates. The above post is for information only and does not reflect professional advice and is not intended to supercede the professional advice of others.)