Joist size and bolt sizes

[platforminc]

Hi All,

I would like to confirm the correct bolt sizes to use for the following joists.

200mm x 50mm
100mm x 50mm

Also, the timber connectors should they be double sided or single sided.

Thanks in advance.

 

[tony1851]

?

 

[platforminc]

?

I mean joining 2 joists together.

 

[freddiemercurystwin]

?

 

[^woody^]

?

?

Not a clue between them.

 

[^woody^]

I would like to confirm the correct bolt sizes

Post the size then if you want it confirmed.

For timber connectors, the pointy bits need to stick into timber.

 

[freddiemercurystwin]

?

Fixed that for you woods.

 

[platforminc]

Post the size then if you want it confirmed.

For timber connectors, the pointy bits need to stick into timber.

Timber sizes are


200mm x 50mm or 8 inches x 2 inches
97mm x 47mm or 4 inches by 2 inches

Would M12 120mm or 130mm work, together with round washers

In some cases, structural engineers notes states that a beam 001 which is the first floor ceiling over the staircase, he stated M16 bolts with 7mm diameter timber connectors. However for the other joists etc, no bolt sizes were mentioned hence why i want to confirm.

 

[^woody^]

m10 are generally fine so m12 would certainly be. Length would be the thickness of the timbers plus at least 30mm.

m16 are a joke

 

[tony1851]

Do you really need timber connectors between the pieces? If the loads are not great, why bother? The spiked connectors can be a devil to fix - they normally need to be tightened up with a piece of h/t steel bar first, which is removed, and then standard bar or bolt inserted and tightened.

 

[garyo]

Are you trying to join two joists together to make a single, longer joist? Or sister two joists together to make a single stronger joist the same length?

 

[platforminc]

Are you trying to join two joists together to make a single, longer joist? Or sister two joists together to make a single stronger joist the same length?

Join 2 joists together to make longer and also replace some.

 

[John D v2.0]

When we need some spliced the se just specified bolted. The builder tried to use some structural screws but they were apparently no good as the timber needed clamping together firmly.
There was nothing about spiked washers but the span isn't much, around 1.2m for 7 by 2s.
Hope that's any use.