G'day and welcome back to Buildsum and in this video. I'm just going to go through
Setting up for the bearers and obviously
the position of our piers is dependent on
The allowable span of our bearers so you can see there
I've got all the piers in place, but I just put the bearers in
That refresh so the distance from this bearer
I'll sort of this pier to this pier here is going to be dependent on what the allowable span
for our bearer and
Also the distance from this pier here to this pier here
Is going to be dependent on what the allowable span for our joists is
So generally I try and make them roughly the same but we have to go and have a look at a set of span tables
To find that information now
Span tables are generally based on, here in Australia, AS 1684.2 for area
But and they're not freely available, however, there are a number of organizations
And companies that put out software or they put out their own span tables that comply with 1684
And you can use those so the ones are going to use today are the TABMA ones
Which are these ones and I'll put a link up for this in the bottom of the description of the video
but there's also other software like
Hyne put out
there Hyne design 7.5
So that all complies with Australian standards and I'll put a link into a video about that as well
There's another software called timber solutions
Which you can get for free, but you generally have to register
to get them
ok, so this set of
Tables has a couple of different sections. So this is for supporting roof loads. oh sorry. This is for
Internal floor joist not supporting roof load. So obviously that's not us so you can not worry about that one
Floor bearers so this is one we need for domestic balconies or decks
Ok, so you can see they're sort of broken up
There's a lot of different columns and a lot of different rows so you can see here if you look over here. This is for
softwood F5,softwood F7 and
MGP10, so I'm going to run with MGP10 because that's what you can commonly by out of the
hardware stores at the moment
you also have
single span or continuous span, so
I'll go back to here. So if you are gonna run your bearers full length
And they're going to go over one joist, Sorry one pier or more
They are continuous span if they only span from this pier of this pier they are single span
okay, so that the ones I'm gonna use
Continuous span so I can use the continuous span side. So that puts me down into this
Group of figures
and I want to the next the other thing here is
what I call the floor load width and again, I've got a video on that but basically
that's the distance or the amount of
Floor that that particular bearer is going to carry
so
It's basically
It's equal to the span as well. Okay, if you like so
I'm gonna I'll try going to try and work it with a span of about 1.5
I like that as a sort of a good span, so I can't use the 1.2 column
I'm gonna have to use the 2.4 column. So I'm gonna come down this column
So as I said, I want to get to about 1.5m span for this job and it's up to you guys
How you want to do it
Whatever you think is more economical
As far as the amount of timber you're using for that for the for its cost and how far it actually spans
Okay, so if I look here
to achieve a
1.5 meter span or
1500 millimeter span I
Can use 2/120 x 35
Nail laminated together. Okay, and that will also give me a 400mm cantilever, which I'll explain in a minute
Okay, so I'll think I'll run with that. I'm gonna use a 120 x 35 so I can come back to my deck so
here, I'm gonna use
120 x 35 two of them nailed together
And that will allow me to span or space
My piers this way
1.5m apart
I'll have to go and have a look at the joists to see
How far apart I can do them there and I'll do that in the next video
G'day, I'm back
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