Typical infestations found are Common Furniture and Deathwatch Beetle.
Common Furniture beetle usually attacks sapwood in dry situations and can be a long-term problem. Identification is granular lemon shapes pellets.
Death-watch beetle attacks both sapwood and heartwood of decaying timber and is usually associated with moisture ingress. Identification is by disc shaped pellets.
Death-watch beetle frass microscope image.
Treatment of reasonably sound timbers can be by insecticide, but surface treatment does not guarantee adequate elimination of the infestation.
Decadet micro-bore probing can detect the extent of any internal deterioration. From analysis of the section the general loading strength can be determined.
Decadet graph detailing beetle attack damage to section