Browse Forums Building A New House Re: M Class Slab/Foundation on a Site Classified P?? KDR in 2Sep 17, 2017 6:12 pm Our build thread viewtopic.php?f=31&t=82369&p=1525857&hilit=fairhaven#p1525857 Re: M Class Slab/Foundation on a Site Classified P?? KDR in 5Sep 18, 2017 5:24 am Our build thread viewtopic.php?f=31&t=82369&p=1525857&hilit=fairhaven#p1525857 Re: M Class Slab/Foundation on a Site Classified P?? KDR in 6Sep 18, 2017 5:25 am Designer,Engineer (Civil,Const & Envir),Builder,Concrete & Masonry Contract.Struct Repairs Re: M Class Slab/Foundation on a Site Classified P?? KDR in 8Sep 18, 2017 2:07 pm Designer,Engineer (Civil,Const & Envir),Builder,Concrete & Masonry Contract.Struct Repairs Re: M Class Slab/Foundation on a Site Classified P?? KDR in 11Sep 18, 2017 4:36 pm Designer,Engineer (Civil,Const & Envir),Builder,Concrete & Masonry Contract.Struct Repairs Re: M Class Slab/Foundation on a Site Classified P?? KDR in 13Sep 20, 2017 9:26 am Designer,Engineer (Civil,Const & Envir),Builder,Concrete & Masonry Contract.Struct Repairs Re: M Class Slab/Foundation on a Site Classified P?? KDR in 14Sep 20, 2017 11:20 am insider 9528 You have basically have a non reactive profile so a engineered designed "M" type slab with edge beams on piers to natural sand should be more than adequate according to the bore logs. Your original classification "P" could be argued that it is was overkill but better to be on the safe side. Hi Insider, Thanks a lot for your insight. Is that right cost wise, steel piles are the most expensive, screw piles sits in the middle with concrete piers being the rather cheapest option among these three? Cheers, mate. Re: M Class Slab/Foundation on a Site Classified P?? KDR in 15Sep 20, 2017 12:25 pm insider 9528 You have basically have a non reactive profile so a engineered designed "M" type slab with edge beams on piers to natural sand should be more than adequate according to the bore logs. Your original classification "P" could be argued that it is was overkill but better to be on the safe side. Here is the footing recommendation section from 2nd soil report They have recommended M class foundation. But somehow the final engineering plan I received hasn't been updated to reflect that. May I ask what would be the reason for that? Thank you Like ⋅ Add a comment ⋅ Pin to Ideaboard ⋅ Re: M Class Slab/Foundation on a Site Classified P?? KDR in 16Sep 20, 2017 6:03 pm 9528 Because your site has been classed as "P" site it means a engineer has to design the slab to take into consideration the reason for it being classed a "P".In your case abnormal moisture conditions so the engineer has modified a class "M" type slab to suit your site conditions. So the report states: "As a minimum guide only a footing dimension similar to a classification of "M" maybe considered" So what you have ended up with is a engineer designed beefed up "M" type slab. Steel piers and screw piles are the same thing so it is usually a choice between bored concrete piers and screw piles. Screw piles are more expensive but have come down a lot over the years . The only problem I can see is you have loose fill and loose sand which can collapse when drilling the concrete piers especially during wet conditions so the engineer and builder may lean towards screw piles which avoids that issue. You could ask for a stiffened raft slab founded into the natural sand if you want to avoid a waffle slab on piers. Re: M Class Slab/Foundation on a Site Classified P?? KDR in 17Oct 02, 2017 8:36 am insider 9528 Because your site has been classed as "P" site it means a engineer has to design the slab to take into consideration the reason for it being classed a "P".In your case abnormal moisture conditions so the engineer has modified a class "M" type slab to suit your site conditions. So the report states: "As a minimum guide only a footing dimension similar to a classification of "M" maybe considered" So what you have ended up with is a engineer designed beefed up "M" type slab. Steel piers and screw piles are the same thing so it is usually a choice between bored concrete piers and screw piles. Screw piles are more expensive but have come down a lot over the years . The only problem I can see is you have loose fill and loose sand which can collapse when drilling the concrete piers especially during wet conditions so the engineer and builder may lean towards screw piles which avoids that issue. You could ask for a stiffened raft slab founded into the natural sand if you want to avoid a waffle slab on piers. insider Thanks a lot for the clarification. As long as it's a beefed up M slab and adequate for the soil condition, I'm happy. Re: M Class Slab/Foundation on a Site Classified P?? KDR in 18Oct 02, 2017 9:19 am 9528 insider 9528 Because your site has been classed as "P" site it means a engineer has to design the slab to take into consideration the reason for it being classed a "P".In your case abnormal moisture conditions so the engineer has modified a class "M" type slab to suit your site conditions. So the report states: "As a minimum guide only a footing dimension similar to a classification of "M" maybe considered" So what you have ended up with is a engineer designed beefed up "M" type slab. Steel piers and screw piles are the same thing so it is usually a choice between bored concrete piers and screw piles. Screw piles are more expensive but have come down a lot over the years . The only problem I can see is you have loose fill and loose sand which can collapse when drilling the concrete piers especially during wet conditions so the engineer and builder may lean towards screw piles which avoids that issue. You could ask for a stiffened raft slab founded into the natural sand if you want to avoid a waffle slab on piers. insider Thanks a lot for the clarification. As long as it's a beefed up M slab and adequate for the soil condition, I'm happy. Most Stakeholders , Battlers & Punters ask for EXTRA OVER ...COSTS & PROOFS Designer,Engineer (Civil,Const & Envir),Builder,Concrete & Masonry Contract.Struct Repairs I am not sure whether Perth has its own way of doing things in regards to this. Most of Perth has class A (sandy soil), except for some areas near rivers or hills. 2 13091 The Soil classification has little to do with piers. The purpose of the classing of the soil is to identify the clay content and the "average expected range of movement… 2 9853 We were lucky in that our old house was so small (86 square metres) compared to the new house, they were able to take enough readings around the old backyard house before… 8 37139 |