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insider

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Joined 8 April 2014
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2 d2 dinsiderinsider posted:
Skirting boards pulling away from wall and floor tiles

When your house was constructed the would have done a soil test first and classified how reactive the soil is.That determines
what size your foundations are.

2 d2 dinsiderinsider posted:
Skirting boards pulling away from wall and floor tiles

Do you know what your soil classification is?

2 d2 dinsiderinsider posted:
Skirting boards pulling away from wall and floor tiles

Can you give us some more information.Is the damage near the middle of the house? What suburb are you in? Did it happen immediately after construction or just recently?

4 d4 dinsiderinsider posted:
Chemical Underpinning my home

Agree with StrucuralBIMGuy did you get a report first?

1 month1 monthinsiderinsider posted:
Protecting your Slab

Yes as long as it is done properly and slopes away from the building.You could slope the plastic into an agi drain away from the the perimeter.

1 month1 monthinsiderinsider posted:
Arden Developments

One way around it is sign the contract subject to soil test so you can back out.This estate is literally a filled in swamp.

2 months2 monthsinsiderinsider posted:
Slab Heave Cause?

Yes there is a solution.
First the builder need to grade the soil away and then puts OH&S material down.An alternative is to put builders plastic down first and then OH&S…

2 months2 monthsinsiderinsider posted:
Slab Heave Cause?

How do you retain or increase the moisture in our gardens? you mulch.So putting mulch (wood chips,gravels,rubble.pebbles)around the outside of a house under construction we increase the moisture content of…

3 months3 monthsinsiderinsider posted:
Slab Heave Cause?

Yes that is right.They are a hybrid design but still predominantly a waffle but as you say slightly deepened to try and prevent
water ingress under the slab.
In my opinion this…

3 months3 monthsinsiderinsider posted:
Slab Heave Cause?

Screw piles can be more expensive so they can be recommended as an alternative if for example there was water or collapsable fill that would be an issue for bored…

3 months3 monthsinsiderinsider posted:
Slab Heave Cause?

It's complicated, political and historical as well.But we have our fair share of brilliant engineers and geotechs just like any state.
If you study the development of the standards you will…

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3 months3 monthsinsiderinsider posted:
Slab Heave Cause?

Yes its ironic isn't it.They invented the waffle and now they don't use them.The reason is that they actually call site class"E" in SA so for waffles the step up…

3 months3 monthsinsiderinsider posted:
Slab Heave Cause?

No I have seen raft slabs heave from that period.There may be slightly less damage but it is hard to compare directly
to waffle slabs because each situation can be…

3 months3 monthsinsiderinsider posted:
Slab Heave Cause?

So in this case when building waffle slab it should be build on rainy season? Where the soil has been heave with all the extra moisture?
For example if you built…

3 months3 monthsinsiderinsider posted:
Slab Heave Cause?

No I have seem many slabs on piers heave off the piers.The bored concrete piers are not connected in general to the slab.
Screw piles are different but you need a…

3 months3 monthsinsiderinsider posted:
Slab Heave Cause?

FirstHome builder25 I hope this helps you.

This is just my opinion from the limited info you have posted and photos you have provided with my knowledge of your estate…

  ⋅  1
3 months3 monthsinsiderinsider posted:
Slab Heave Cause?

The downpipes are not connected in the middle photo and I can't see any stormwater entry pipes sticking out of the ground.
Was there an issue with the plumbing after the…

3 months3 monthsinsiderinsider posted:
Slab Heave Cause?

Hi firsthomwbuyer25
You have a class "p" due to the depth of clay fill on site.
Your house was built during a drought which was the second halve of 2015 followed by…

4 months4 monthsinsiderinsider posted:
Is square set cornice more prone to cracking?

Yes it is and is more visible than standard cornices.If there is some movement in your foundations or frame it can be more noticeable with square set.I would recommend it…

4 months4 monthsinsiderinsider posted:
Land depth to Rock vs FILL depth question

Your site should be a class "p" unless it has been reclassified .Can you post the report?

5 months5 monthsinsiderinsider posted:
Slab for garage - is engineer over engineering it?

Ok sounds like you have confidence in the engineer.The only reason I say this is because I have seen a lot of slabs fail due to tree drying effect without…

5 months5 monthsinsiderinsider posted:
Considerations for how much to cut block? Engineer report?

You could also consider cut and fill rather than straight cut.This may cost you more in earthworks, retaining walls and piers for your slab but save you on significant rock…

5 months5 monthsinsiderinsider posted:
Slab for garage - is engineer over engineering it?

How do you know your slab now hasn't been under engineered? What was the reasoning behind using piers in the first place?
I would ask the original engineer why they designed…

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5 months5 monthsinsiderinsider posted:
M-class Slab on P class soil

Geo1
As you say the end result is a "M".So giving a figure even within 5mm in my opinion is unrealistic.
Usually one samples is taken from a site to do Lab…

5 months5 monthsinsiderinsider posted:
M-class Slab on P class soil

Did they do Lab testing on soil samples or just plucked that figure out of thin air?Not all KDR have to be class "P" sites

5 months5 monthsinsiderinsider posted:
M-class Slab on P class soil

You will have to ask the design engineer about the modifications if any.If everybody has done their job correctly then it is reasonable to expect what they say is correct.How…

5 months5 monthsinsiderinsider posted:
M-class Slab on P class soil

The report says that the site is a class"P" but because the fill is controlled your design engineer can use a "M" type slab with some modifications.
The fill has been…

5 months5 monthsinsiderinsider posted:
Slab heave is alive and well, watch out.

Does the concrete slope away from the house ?

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