Notches are on the top of joist
Notches in joists
- Thread starter awaitcall
- Start date
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It's a pre 1900s terraced property wit a 400mm spacing and the grade well you can work it out on a pre 1900 house
Thanx
Thanx
If you assume the grade is C16; joists 75x170 would do you a span of 4.14m. Which means at 200mm your joists are over-engineered for the span and 170mm joists would be adequatre. A 32mm notch out of a 200mm is equivalent to a 7mm notch out of a 170mm joist. So really your notch is not overly large. Five feet from the wall is outside the normal guide lines of where the notch should be positioned but to compensate your period timber will be a lot stiffer than C16. In fact research into historic timbers shows that it would most likely come in well above C24.
To support that you could test the deflection and work the strength grade backwords. Timber members never fail calculations for stress - they always fail in deflection first. So if your deflection is good then the floor is good.
To support that you could test the deflection and work the strength grade backwords. Timber members never fail calculations for stress - they always fail in deflection first. So if your deflection is good then the floor is good.
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just double checking thats centers and not distance between ??
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