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No its not a trimmer joist. There are intermediate supports so the maximum span is about 8 ft. This is the ground floor of a 100 yr old house.

Thanks for the quick responses! Yes the pipes go through the joists vertically. Joists are 100x50 (4x2), and the holes are about 17mm, so that still leaves about 33mm of "solid" joist. May not be a problem, just wanted to be sure. Cheers.

We recently had central heating installed. While doing some work under the floor recently I noticed that the pipes to one of the radiators both go vertically right through the middle of two floor joists. Would it be advisable to reinforce the joists? If so is it just a matter of laying a...