Notches in joists

[awaitcall]

Iv just had a inspection from building control for a loft conversion everything ok. We have also installed a bathroom suite on the first floor and the only objection was that the 32mm waste for the sink notched exactly 32mm did not comply. The joist is 8 x 3. BC inspecter wants calculations regarding this.

I personally thought notch upto 2inch is fine but obviously i was wrong.

Is ther any calcs i can do and get the inspecter off my back.
Thanx

 

[big-all]

holes up to 25% notches 12.5% 1/8th
if the timbers are over specked for the span you may just get away with it hence his question

 

[freddiemercurystwin]

http://www.zurich.co.uk/NR/rdonlyre...-0C6B2CD53EED/0/NotchingDrilling107780A02.pdf

 

[awaitcall]

With anyones experience is 32 mm enough if not whats the way around

Thanx

 

[big-all]

With anyones experience is 32 mm enough if not whats the way around

Thanx

unsupported span and joist centers may help us answer your question ??

 

[freddiemercurystwin]

With anyones experience is 32 mm enough if not whats the way around

Thanx

The BCO will want cacls off someone suitably qualified and insured to provide such calcs!

Thanx

 

[Static]

With anyones experience is 32 mm enough if not whats the way around

Thanx

The BCO will want cacls off someone suitably qualified and insured to provide such calcs!

Thanx

Someone suitably competent.. and insurance is just a nicety which makes you feel less guilty when you claim against them and dont take their house and car in the deal..

 

[^woody^]

That's not a notch ... this is a notch

Untitled

• ^woody^
• 16 Jun 2008
• 7

Just glue and screw 1m of 12.5mm ply each side of the notch

 

[patsmotors]

who ever cut out the notches should be aware of what they are doing.

 

[warmadmax]

That's not a notch ... this is a notch

Untitled

• ^woody^
• 16 Jun 2008
• 7

Just glue and screw 1m of 12.5mm ply each side of the notch

that's a bloody trough!

 

[jeds]

What span and centres?

 

[sunnie]

32mm = 35mm expansion etc.

 

[awaitcall]

The joists is about 4 meters and the notch is about 5 ft from the wall

 

[freddiemercurystwin]

What centres?, in top or bottom of joist?

 

[sunnie]

As your building inspector has asked for calculations,he will expect calculations
Some building inspectors have different ideas,i have plumbed many lofts in london and where a waste pipe had to pass through a 200 x 75 joist the only solution accepted was to double up the joists and only drilled holes were allowed.
bc inspection was required before ceilings could be fitted.

sunnie