Are you really suggesting that all the timber in a house should be treated, skirtings, architraves joists, flbds, rafters , etc etc.
Not really practical, if I recall somebody some years ago came out with something along the lines of the old sticky fly paper that you put in the roof space in order to prevent woodworm.
Not sure if it really worked but apparently you had to replace each year and after about 6 years the cost was about the same as treating all the roof with an insecticide.
Not sure where you get that from, how do you explain infestations in furniture and doors in a house.
Modern house are at a greater risk of structural damage by woodworm as they contain a greater degree of sapwood than those of yesterday, say 60 years ago.
Termites just love the conditions you describe, the government was trying to eliminate an infestation somewhere in Devon years ago and gave up after spending x£0000s
The fumes from cellulose thinner left on a rag during May and June ( when the beetles emerge ) kills them off hence stops them from mating and spreading.
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