Nogging necessary ?

[Peter_K]

Thinking about whether this is good or if a row of noggings in the middle serves a function. The length of the floor joists is about 250. The old ones are 70x200 and the new ones are 45x195.

 

[Mazen]

Shortening is never wrong, it becomes more rigid sideways. I would put 2 per "compartment". And you have more to screw floor chipboard/gypsum into.

 

[Peter_K]

The worst part is that the old beams are far from straight, so if you cut at 90 degrees, there will either be a gap at the top or at the bottom.

 

[Mazen]

Use a bevel gauge and saw according to that angle, sure it's more work but you'll get a better result. If the gap isn't too large, use something like hardboard as a filler where it gaps the most. If you offset the noggings and screw through the beam, you'll still have a good fastening if it doesn't gap too much. You can also plane the beam so that it's smooth where the nogging should sit, but that feels a bit over the top.

 

[Peter_K]

It wasn't as terribly skewed as I feared. Unfortunately, the scrap pieces ran out but maybe it's time to call it a night anyway. A shower and a cold beer would be nice

 

[justusandersson]

You have absolutely not done any work in vain, but the blocking has no function when it comes to the floor's deflection, whereas the number of beams does. The blocking can affect the bounce by distributing a point load over more beams, but you're already on the safe side there, mainly due to the short span.

 

[MagHam]

@justusandersson You're contradicting yourself a bit
Aren't "svikt" and "nedböjning" the same thing?

 

[justusandersson]

No. One is a dynamic phenomenon and the other is a static phenomenon. Deflection is the result of the total load on the floor. A uniformly distributed load is assumed when calculating deflection. Bounce is when a person walks and stands at the most sensitive spot, i.e., constitutes a point load. Bounce problems mainly occur with large spans.