How to attach intermediate joist to frame

vineeththampi01 · 1 Aug 2022 at 14:58

Hi All,

I am in the process is building a deck quite close to ground. I have built the perimeter (framing with 47 * 147 timber) with post every 2.4 m roughly. The shape roughly looks like a triangle. I am bit stuck with how to attach intermediate joist to the framing. I am using a joist hanger on one side (The end which is perpendicular to the intermediate joist), but the other end joins the frame at 28 degree angle. Any idea would be more than helpful.

Thanks,

Vineeth

Decking Frame Full

Intermediate Joist meeting frame at 28 degree angle:

Dis86 · 1 Aug 2022 at 15:08

With a screw :confused:

Fireskull · 1 Aug 2022 at 15:24

Random first post.......

But as above with screws or nails....

skyripper · 1 Aug 2022 at 15:37

Are you planning to have intermediate posts inside the triangle, or are your joists spanning a real long.. span?

support, clamp, screw it from several angles then remove the clamp/support and test. I'd be looking at coach bolts rather than screws where you can, using a spade bit to cut out somewhere for a washer to sit and bolt thru the wood like that.

Thekwango · 1 Aug 2022 at 15:43

ohh is there gonna be a big reveal, 'hi guys found this website selling just what i needed, have a look here'........

vineeththampi01 said:
Any idea would be more than helpful.

also, if you're not sure how to join 2 pieces of wood together, now's probably a good time to stop what you're doing and get a professional in

vineeththampi01 · 1 Aug 2022 at 16:08

Thanks for all inputs. My initial thought was to use posts every 2.4m / coach screw So for the intermediate joist in picture which is roughly 7m

(Joist hanger) ......2.4m ..... (Post) ......2.4m ..... (Post) ..... (Coach screw)

But wasn't sure if coach bolt will hold, also thought there would be a reason why builders use joist hangers instead of coach screws?

@skyripper I quite like the coach bolt idea with a spade bit. That would give it a good hold.

skyripper · 1 Aug 2022 at 16:20

Joist hangers are for hanging joists on brick walls. They're convenient for decking but not essential. What is essential is using beefy enough fixings as you have a sheer force of joist taking weight being pushed downwards with pieces of metal holding the wood together. You may be better trying to make it a joint rather rather than just bolting one to the other.

Not sure how much bounce you'll get with posts every 2.4m. Guess that depends on any noggins you put in.

vineeththampi01 · 1 Aug 2022 at 17:45

I did refer some of the joist span calculations and as per building reg and it says it can go upto 3m, but 2.4m sounds quite nominal. I might add some noggins like you said just to be sure

A joint sounds a bit tedious for my skill set, will go with coach bolt option instead