When you look at a block its always worth asking the Developer’s Agent what the Soil Classification is ……….. Only don’t take what you are told too seriously!
Usually the developers opinion is going to be that the site is going to be better (lower site costs) than your builder.
To understand why you need [read more...]
If you want to build your new home on a slope you may need to have the additional cost of needing drop edge beams on the low side of the slabs.
These are a sort of retaining wall to hold the fill under the house slab as shown in the drawing below.
Based on the Soil Classification rock is considered one of the best surfaces to build a house foundation.
It comes under the Classification Class A.
That doesn’t mean its going to be cheap especially for a conventional raft or waffle pod slab.
Any excavation such as leveling the site and excavation for sewerage and [read more...]
I have previously posted about building on fill using Concrete Piers.
Well one alternative to constructing concrete piers is to use Screw Piles such as the one to the right.
These are made from a steel tube with:
A cutting edge on the bottom. A spiral plate close to the bottom. A keyway at [read more...]
A ‘Conventional’ Raft Slab is a concrete base with thickened beams laid directly on the base.
This photo shows the base covered in poly and with reinforcement in position ready for placing of concrete.
Advantages Better thermal mass, and incorporates thermal mass of ground so better suited to passive solar design. Less susceptible to bad [read more...]
A ‘Waffle Pod’ slab is now probably the most common Concrete ‘Raft’ House base. Its generally taken over from the Conventional Raft Foundation.
It’s an example of composite construction with polystyrene pods forming voids in the underside of the concrete ‘Waffle’.
This photo shows the pods, with the reinforcement placed over them, prior to placing [read more...]
Building on sand at first seems to be an issue…… although I have heard it said that sand is actually the easiest ‘soil to build on.
If you live in West Australia there is a good chance that your house will be on sand so there is plenty of experience around .
Its not unusual for the Site Investigation for your new house to reveal fill materials on top of the more stable clay or rock.
Even if there is no fill the builder may need to level a sloping site using ‘Cut and Fill’ methods, or the top layers of soil are generally poor.
To deal [read more...]