Nogging or not in ground-level deck?

[Ulinder]

Hello,
I've just finished framing the deck and am considering whether noggins are needed for stability. The deck is close to the ground, and the joists (45x120) are placed on concrete slabs with a spacing of 60 cm. Approximately 1.5 m between the concrete slabs. The longest joists are 4.20 m. I will be screwing in deck boards (28x145) which I think have the same function as noggins, i.e., preventing the joists from twisting under load. I appreciate your wise thoughts on this. Would you take the time to install noggins?

 

[Kane]

No, the decking will hold the framework together.

 

[falkn]

I probably would have done it, yes. On the other hand, I wouldn't have laid the foundation like this at all.

 

[Ulinder]

I probably would have done it, yes. On the other hand, I wouldn't have laid the foundation like this at all.

A bit late to change the groundwork. I'm a happy amateur but the framework seems very stable when I jump around on it. Made the decision early on not to use plinths. Decision entirely based on three previous decks I've built on concrete slabs. These have been completely stable.
Given the construction that is now in place, what do you think noggins will achieve that the decking doesn't?

 

[falkn]

A bit late to change the groundwork. I'm a happy amateur, but the framework seems very stable when I jump around on it. I made the decision early not to set piers. The decision was entirely based on three previous decks that I built on concrete slabs. These have been very stable.
Given the construction that is currently in place, what do you think noggins will achieve that the decking does not?

It's certainly very stable now. But how it will look after a few years with frost and thawing is hard to guarantee.

The noggins can prevent the joists from twisting or becoming banana-shaped. Hopefully, they can also result in slightly more even settling.

 

[Ulinder]

It's probably very stable now. But how it will look after a few years with frost and thawing is hard to guarantee.

The noggings can prevent the studs from twisting or becoming banana-shaped. Hopefully, they can also result in more even settling.

Thanks for the reply!
I'll just have to keep my fingers crossed for mild winters and well-drained/well-packed ground.
Would you install two noggings per bay?

 

[Eddie W]

Thanks for the response!
I will simply have to keep my fingers crossed for mild winters and well-drained/well-packed ground.
Would you install two short joists/sections?

Skip the short joists... the decking will stay in place...

 

[Leif i Skåne]

I had set kortlingar, but maybe you can set 2 that lock 3 together in certain exposed places to prevent them from laying down.

 

[Ulinder]

I would have installed noggings, but perhaps one can set two that lock three together at certain vulnerable spots to prevent them from sagging.

Thanks for the tip. I'm leaning towards installing noggings in some form. Maybe as you suggest, two that bind three studs together.

 

[witten]

It is probably very stable now. But what it looks like after a few years of frost and thawing is hard to guarantee.

The noggings can prevent the studs from twisting or becoming banana-shaped. Hopefully, you can also get a little more even settlement.

That is not the purpose of the noggings. They can be installed to reduce the deflection somewhat when walking if one is on the low end of the studs' dimension. But the least work is to choose studs of sufficient dimension instead.

 

[falkn]

Thanks for the response!
I'll just have to keep my fingers crossed for mild winters and well-drained/well-packed ground
Would you install two kortlingar/fack?

Yes, that seems about right.