Oversized notching
- Thread starter gemshan1
- Start date
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They might ask for justification from a structural engineer…
50mm deep in 150mm joists x6, 3m span, 300mm from end!
Inspectors don't inspect notches!
However, the question should not be "will this fail an inspection" but "will the floor joists collapse in a few years when my extension has passed, the timber stabilised and the floor loaded"
However, the question should not be "will this fail an inspection" but "will the floor joists collapse in a few years when my extension has passed, the timber stabilised and the floor loaded"
Lol, not in this realm of reality.
BC come to us with all sorts of questions these days…
300mm from the end it’ll be fine. Close to the middle it might be a problem.
As stated it will be OK, assuming the timber was 100 x 60 the shear stress would be 0.5N/mm2 whilst allowable is 7N/mm2 so theoretically structurally OK for shear which is what its all about at beams ends. Convincing BC if they pick it up ??
Don’t inspect notches? So why do we pay for there service!? The floor falls through who’s liable….
Some of the things you see in real world. Downlight notched into a 100mm joist only 25mm left of the joist!
Soilpipe bend notched into 9 " joist not much left of joist. Many of these new linear shower wastes require carving the joists up. Never seen a structural failure though.
Soilpipe bend notched into 9 " joist not much left of joist. Many of these new linear shower wastes require carving the joists up. Never seen a structural failure though.
Things do bend and flex though...
I've a universal column holding my bathroom floor / kitchen ceiling. The "straw that broke the camel's back" was (previous home owner) holesawing a wastepipe through the middle of each 2x7 joist, midspan, with a freshly tiled floor and underfloor heating laid on top. Along with a series of new notches for water and towel rails.
That combined with the loft conversion decades earlier moving purlins onto a dividing wall that is sitting on these joists (with nothing underneath) and many other historical notches.
Total deflection mid span was 65mm.
Lucking there's 3m ceilings. Added the UC, new suspended ceiling and you'd never know.
I've a universal column holding my bathroom floor / kitchen ceiling. The "straw that broke the camel's back" was (previous home owner) holesawing a wastepipe through the middle of each 2x7 joist, midspan, with a freshly tiled floor and underfloor heating laid on top. Along with a series of new notches for water and towel rails.
That combined with the loft conversion decades earlier moving purlins onto a dividing wall that is sitting on these joists (with nothing underneath) and many other historical notches.
Total deflection mid span was 65mm.
Lucking there's 3m ceilings. Added the UC, new suspended ceiling and you'd never know.
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