Although Codes typically prohibit drilling holes closer than 2" to the bottom of joists, a 1" hole through 4 consectutive 2x8 joists should not make much of a difference, and should not be cause for much concern....
...Especially if these holes are not in the middle 1/3 of the joist span.
If you remain concerned, simply glue and screw 2 pieces of 2x8 2 feet long on either side of each joist where you have bored the low 1" holes.
Then drill your 1" hole at the height you wish, then run your cable.
on 
Post Reply
Watch this Post
