Requirements for drilling holes in joists

[stuart569]

Could anyone point me in the right direction for requirements to drilling joists? eg. distance out from end of etc... Have used a guidance sheet before but really dont have the time to trawl google searching for regs.
Cheers

 

[SMB]

Part P.

Grin.

 

[SMB]

Hang on ill look for you.

 

[nickblake]

center line more than 50mm from bottom and top of joist then in a zone between 0.25 and 0.40 x span
hole is 0.25 x joist depth notch 0.125 x joist depth ,notches 0.07 and 0.25 x span

 

[stuart569]

In scotland mate no part p here

 

[Dean182]

On site guide: Between 0.25 x joist span and 0.4 x joist span

 

[SMB]

Page 119 'Electricians guide to the building regs'

*Notches on top of joist in a zone 0.07 and 0.25 x joist span.

*Max depth of notch should be 0.125 x joist depth.

* Holes on centre line of joist in a zone between 0.25 and 0.4 x joist span.

* Maximum diameter of hole should be 0.25 x joist depth.




Easier to understand with a diagram, but I hope that helps.

Regards.

 

[stuart569]

Part of the reason I ask is the plumber has staggered his holes diagonally. 4 holes in total and totally screwed my main clipping run.Its a new build

 

[telectrix]

first requirement is a drill

 

[PC Electrics]

Building Regs Part A (Structure)
It's in diagram form in the Electricians Guide to the Building Regs.
The plumber should be working to BRs just the same as you. Report it to the site manager perhaps.

 

[stuart569]

Thanks lads
Help is appreciated

 

[Geoff76]

middle of joist vertical horz 30 mm apart..

 

[NMc]

Regulations 522.6.5 – Impact (AG), Cables installed under floors or above a ceiling
• Generally, a cable should either be:
i. installed ≥ 50 mm vertically from the top, or bottom as appropriate, of the joist or batten,
ii. incorporate an earthed metallic covering (e.g SWA, MICC etc.),
iii. be enclosed in earthed metallic conduit, trunking etc.),
iv. be provided with mechanical protection to prevent the penetration of the cable by nails, screws and the like

 

[brucelee]

hi mate
spot on info from nick blake and smb
but dont go drilling rafters in the loft

 

[Knobhead]

Glad I rewired my 1st house before the 15th edition at one point there was 40 cables running under the landing floor! From 1.0mm up to 16mm.

 

[SMB]

Glad I rewired my 1st house before the 15th edition at one point there was 40 cables running under the landing floor! From 1.0mm up to 16mm.

You still might be if you jump up and down too much........

 

[stuart569]

Found a good diagram.Nice and easy to understand. Wish me luck explaining this to the plumber tomorrow!

http://www.eaststaffsbc.gov.uk/Services/buildingconsultancy/Building%20Control%20%20Technical%20guides/Notching%20and%20Drilling.doc

 

[NMc]

Good diagram stuart569