Drilling wooden joists

by **scunnybunny** » Thu Nov 03, 2011 8:10 am

Hi,
What is the minimum distance allowable from the bottom of a 32mm hole in a 200x60 joist.
The joists to be drilled are 5ft.from the inside wall in a dormer house bathroom.

by **welsh brickie** » Thu Nov 03, 2011 10:53 am

you always drill centre of joist, so 200mm joist, the bottom of the hole should be 85mm from the bottom of the joist

by **scunnybunny** » Thu Nov 03, 2011 11:36 am

Thanks for your prompt reply.I have got 5 of these 32mm holes in my joists with a 50mm to
bottom of hole.Is this ok.If not can you suggest any remedial work necessary.

by **welsh brickie** » Thu Nov 03, 2011 6:43 pm

If there is no major weight on the joists,then I wouldnt worry.BUT if your installing a bath on the joists then you need to brace the joists.Use the same size joist 200mm x 50mm by 1m in length then fix it to the original joist over the holes with 4 x 10mm thick bolts and dog washers.