Does a normal house slab has bored piers?

Discussion in 'Development' started by mehrar_84, 15th Apr, 2019.

Join Australia's most dynamic and respected property investment community
Tags:
  1. mehrar_84

    mehrar_84 Well-Known Member

    Joined:
    29th Jan, 2019
    Posts:
    118
    Location:
    Melbourne
    Hi All,

    Signed a construction contract with a builder who factored in $9k site costs.

    Got an email last week there will be extra $9k site costs. So total $18k.

    He said quote was for P class soil with no bored piers and now the site require 63 bored piers. Soil test still P class.

    Any idea if this sounds right?
    Does a normal house slab not sit on bored piers? (standard)
     
    mehrar_84, 15th Apr, 2019
    #1
  2. Tools

    Tools Well-Known Member

    Joined:
    18th Jun, 2015
    Posts:
    307
    Location:
    In the lounge
    No

    Tools
     
    Tools, 15th Apr, 2019
    #2
  3. mehrar_84

    mehrar_84 Well-Known Member

    Joined:
    29th Jan, 2019
    Posts:
    118
    Location:
    Melbourne
    No to first question or second?
     
    mehrar_84, 15th Apr, 2019
    #3
  4. Scott No Mates

    Scott No Mates Well-Known Member

    Joined:
    18th Jun, 2015
    Posts:
    27,254
    Location:
    Sydney or NSW or Australia
    Seek clarification from the engineer -
    • How deep are the piers?
    • What sort of slab (plate or waffle pod)?
    • What alternatives would the engineer suggest?
    • What geotech investigation was undertaken?
     
    Scott No Mates, 15th Apr, 2019
    #4
  5. mehrar_84

    mehrar_84 Well-Known Member

    Joined:
    29th Jan, 2019
    Posts:
    118
    Location:
    Melbourne
    Hi Scott, added soil test reports and structure engineer footing drawings in media. Can you check?
    Spoke to engineer today he said there is slight fall at the back and soil is not firm so recommended bored piers.
    Just need to sign variation form asap or may have delays.
     
    mehrar_84, 15th Apr, 2019
    #5
  6. JoHa

    JoHa Well-Known Member

    Joined:
    17th Sep, 2018
    Posts:
    58
    Location:
    Tasmania
    If your car mechanic recommends that brakes need replacing, want do you do?
    I'm not sure how tight your budget is but extra 9k seems a relatively small amount for piece of mind when building a house.
     
    JoHa, 15th Apr, 2019
    #6
  7. mehrar_84

    mehrar_84 Well-Known Member

    Joined:
    29th Jan, 2019
    Posts:
    118
    Location:
    Melbourne
    Hi Joha, i understand $9k is small amount in the scheme of things. it's not a money issue but more of understanding everything in detail as i want to do a development site moving forward.
     
    mehrar_84, 15th Apr, 2019
    #7
  8. JoHa

    JoHa Well-Known Member

    Joined:
    17th Sep, 2018
    Posts:
    58
    Location:
    Tasmania
    Soil classification is not the only factor affecting the type of foundation required. Slope, wind classification, size of the structure/building will also be factors, among others.
    Soil class P often requires engineered footings, but not always.
    I'm no civil engineer and I'm not sure a property forum would be the best place to get engineering advice, which is why it is important to build a team of professionals around you which you can trust and seek advice from.
     
    JoHa, 15th Apr, 2019
    #8
  9. Mel Morgan

    Mel Morgan Sydney Property Manager Business Member

    Joined:
    6th Jun, 2017
    Posts:
    1,455
    Location:
    Sydney
    See if you can call the structural engineer who recommended the piers and ask him why they're required. Finding out directly from him will help you so much more.
     
    Mel Morgan, 15th Apr, 2019
    #9