Floor Joists

[mravant]

Just a quicky

My structual engineer has only specified on the BR drawings for the new extension floor joists as 200 x 50 @400mm intervals.
The floor is only 3.1m in span, is it ok to use C16's as apposed to C24's?

Thanks

 

[RonnyRaygun]

In a word...yes

In fact, 50X175 C16 would be fine too, but your SE has probably specified 200 deep joists dur to depth of beams or existing joists...

 

[mravant]

Thank you...I shall sleep much better now.

 

[Static]

Any change to what has been specified on the SE drawings should be run past the SE..

 

[mravant]

The spec only specifies 200 x 50.

 

[^woody^]

If he has not spec'd c24 then you use c16 - which is the standard grade to use

 

[noseall]

Maybe the added joist depth is to accommodate insulation over a garage perhaps?

 

[mravant]

There is going to be a bedroom above and has spec'd 100mm rockwool inbetween.

 

[theoldun]

There is going to be a bedroom above and has spec'd 100mm rockwool inbetween.

Acoustics.
oldun

 

[Static]

If he has not spec'd c24 then you use c16 - which is the standard grade to use

Ditto this..