Timber To Timber Joist Hangers - Screwed Or Nailed?

[chickenlips]

Unless the hanger has the ability to be used with SDW screws or Ledgerlok screws then the hanger capacity is greatly increased. Standard wood screws agreeed, there is no real benefit in performance.

So you can quantify the beneficial difference between 20 screws and 20 nails on a domestic joist?

Please show me where and how 20 screws performs any worse in a domestic floor load.

Well actually its SDS screws apologies typo, but yes here is one example

http://www.strongtie.co.uk/products/type.php?typeID=45&familyID=2
Check standard and SDS installation

They are also currently testing the HIUB with SDS installation for increased capacity (around 11kn I believe).

 

[noseall]

Maybe i misunderstood the O.P. but i was under the impression that jiffys were being used i.e. where there are over a dozen fixing points each side.

What does that data translate to in terms of a regular bedroom floor, i.e. will a nailed joist still hold up the floor or vice-versa?

What difference does it make in 'real' terms? Do you need to sleep alone with one particular type of fixing or can your wife join you too?

 

[EViS]

Yes, jiffy's are being used with around 20 nails per hanger.

On a slightly different note, why are nails always used on roofing joists and roofing battens as opposed to screws?

 

[noseall]

Screws can split wood.

 

[PeakOakFrames]

Nails. The theory is that screws are cast and very brittle (especially cheap ones) with a low shear breaking point. Nails on the other hand are cut from wire and bend instead of shearing. Also they are a damn site faster to put into joist hangers than screws.

 

[noseall]

Nails. The theory is that screws are cast and very brittle (especially cheap ones) with a low shear breaking point. Nails on the other hand are cut from wire and bend instead of shearing. Also they are a damn site faster to put into joist hangers than screws.

The only thing with screws is the heads have a propensity to shear off when screwing something a bit more meaty like say a bent strap for instance.

I quite agree.

 

[^woody^]

You will find that screws, especially when power driven in, will bend and indent the thin metal as it sinks into the surface, and so preventing any chance of shear - which was negligible in the first place

 

[JohnD]

Because of their twist all they need is a smart sideways smack with a bolster and they ease away from their seating enough to get a claw hammer in.

that's interesting. We had to move a number of joist hangers to get the sheet roofing slope right over an end beam, and pulled on the hangers to get the nail heads out enough to grab. It was rather tiresome. They don't have much of a head.