Xyletinus peltatusdamaged wood from buildings>30 yr old was not significantly weaker than undamaged wood from the same buildings. At 70 beetle exit holes/0.0929 m2for all samples and at 27 holes for samples with<0.51 sp gr, the MOR was reduced 31–37% and the MOE 21–27%. Although such strength reductions may be of concern, load sharing of complete floor systems should adequately compensate for structural weakening beetles may cause.