G'day and welcome back to Buildsum and in this video. I want to show you a bit about
the process of cutting and filling to getting blocks of land level and
then some subsequent
things that we need to do with our footing system to
to make sure they don't crack and break due to the different types of soil so
what I've got here is your typical house block this one has a
Fairly good slope on its actually we had a 4m slope
across the length of this block
so
we've got a couple options. We could work with the slope and I'll look at that in some future videos or
We can level the block so today
Now look at levelling it and we use what we call cut and fill so
you'd find a level that's roughly half the
Height of the block and you would then cut out
That so cut down or remove the soil down to that level and
Also, I've taken all the topsoil off the block as well because we're no one who's bringing fill in
onto vegetation so
I've cut away this part of the block
left a bit of land so I can put my fence on and
I'll have to put a retaining wall in front of that
to make sure that doesn't want to collapse so
My block of land is now cut but I still got this uneven section here, and that's going to be filled so we bring in
Fill and I've made that a different shade
Just so we can differentiate between
The natural soil
naturally compacted soil and the
Artificially compacted soil because it doesn't matter how well we pack this in
It's going to have a different compaction to our natural soil
Okay, so there's our cut in this half, and they'll fill in this half all
retained
With the appropriate designed retaining walls, and I look at retaining walls again in a future video
So then our footing systems getting it dropped in and you can see we've got
the same footing system
running through the two different types of soil and as I said because
There at different compaction
then there chances are they're going to move differently and
that can cause uneven movement in the house and therefore cracking and
Cracking in the actual
building so we have to make sure that the half, that's in the fill is going to move the
same as the half that's in the naturally compacted area of the house
so put our footing in and if I pull off fill out for a minute
You can see that this half
This end of the footing doesn't even sit
It's not even deep enough to make it into
The naturally compacted soil so we have to come up with a way of connecting
this half of the footing with their naturally compacted soil, and that's a process called piering
So we drill piers into the bottom. They are footing and that
Into the natural compacted soil and that will assist us in
Making
This half which is in our fill
Move the same as the half in our natural compacted soil and effectively when we do this
The fill doesn't support our footing these act like beams or lintels
Between our piers so in some cases they actually have to beef up the size
of our footing because we need to allow them to span
between our our piers
So you know they're all designed by a structural engineer
and he'll give you the specs of how many you need how often what size lot sort of good gear and
That will get you a footing system that's going to
limit the amount of movement between the two different soil types
And that also applies for slab on ground
The same thing in your thickened edge, you can put piers down and they'll have the same effect
So there we go there's a quick video on at the cut & fill process and
looking at a
piered
footing system to help stop differential movement in the footings