Drilling joists

[Richard3009]

http://www.wycombe.gov.uk/uploads/d...ning/LocationofNotchesandHolesinJoistsA04.pdf


Take a look at above PDF what do they mean by the depth of the joist, the diagram seems to indicate the thickness ??

 

[steamboatwilly]

They're referring to the top to bottom measurement of the joist.

 

[pushrod]

http://www.wycombe.gov.uk/uploads/documents/Environment/Planning/LocationofNotchesandHolesinJoistsA04.pdf


Take a look at above PDF what do they mean by the depth of the joist, the diagram seems to indicate the thickness ??

Almost looks like there are two arrows to the thickness , but i think that is just the drawing. Think the depth will be the vertical distance.

 

[Richard3009]

That begs the question about the footnote, how on earth would you increase the depth of a joist to allow for your hole size??

 

[steamboatwilly]

That begs the question about the footnote, how on earth would you increase the depth of a joist to allow for your hole size??

Yes, quite!

 

[Spudnik]

"If the above requirements cannot be met within the limitations shown, then increase the joist depth by the depth of notches or diameter of holes."

Liking that

 

[pushrod]

hadn't read the footnotes, just rebuild the house - mind it confirms that it is vertical depth as if the holes were max 1/4 of the thickness of the joist you would barely squeeze a cable through.

 

[steamboatwilly]

I imagine they really mean lower the ceiling or raise the floor by the required amount. Seems reasonable and I'm sure the client would be delighted.

At the end of the day, and as usual, this will come down to a local judgement by the contractor.

 

[ianh41]

if you can drill 0.25 times depth you can drill about a 50mm hole in a first floor joist they are about 240mm deep