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raft foundation

  • 02-11-2014 10:45pm
    #1
    derferjam
    Registered Users, Registered Users 2 Posts: 197 ✭✭


    Raft foundation anyone anything abut them that I should look out for.


Comments

  • #2
    BryanF
    Moderators, Home & Garden Moderators Posts: 10,146 Mod ✭✭✭✭BryanF


    Yes you should have an engineer design, a competent insured contractor install and the same PI insured engineer certify all has been installed as per design & building regs


  • #3
    Superdaddy
    Registered Users, Registered Users 2 Posts: 234 ✭✭Superdaddy


    Passive raft such as supergrund or viking? Or traditional raft?
    As a above, let the engineer worry about the specifics.
    Price is the biggie, shop around. I am putting in a passive raft at the moment, saving €10,000 between quotes for exact same product.


  • #4
    hexosan
    Registered Users, Registered Users 2 Posts: 1,740 ✭✭✭hexosan


    When you consider the cost of the raft labour and then the cost of buying and fitting the floor insulation and then pouring a screed, the passive raft doesn't seem that expensive anymore.

    If I had my time back again that's the way I would of went.


  • #5
    Rabbo
    Registered Users, Registered Users 2 Posts: 637 ✭✭✭Rabbo


    If you have to go down the raft route, definitely consider a passive raft. With careful detailing, you can remove most of the thermal bridging at foundation level.


  • #6
    galwaytt
    Registered Users, Registered Users 2 Posts: 12,822 ✭✭✭✭galwaytt


    Std raft as subfloor for 150m2 in Galway around 11k, insulated raft would be more. Last comparison I saw in Mayo was 9k std, 17k insulated.

    Ode To The Motorist

    “And my existence, while grotesque and incomprehensible to you, generates funds to the exchequer. You don't want to acknowledge that as truth because, deep down in places you don't talk about at the Green Party, you want me on that road, you need me on that road. We use words like freedom, enjoyment, sport and community. We use these words as the backbone of a life spent instilling those values in our families and loved ones. You use them as a punch line. I have neither the time nor the inclination to explain myself to a man who rises and sleeps under the tax revenue and the very freedom to spend it that I provide, and then questions the manner in which I provide it. I would rather you just said "thank you" and went on your way. Otherwise I suggest you pick up a bus pass and get the ********* ********* off the road” 



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  • #7
    derferjam
    Registered Users, Registered Users 2 Posts: 197 ✭✭derferjam


    jez this house will be the death of me... the architect said that it is going to have to be a raised foundation with raft foundation.... anyone with such experences


  • #8
    derferjam
    Registered Users, Registered Users 2 Posts: 197 ✭✭derferjam


    Superdaddy wrote: »
    Passive raft such as supergrund or viking? Or traditional raft?
    As a above, let the engineer worry about the specifics.
    Price is the biggie, shop around. I am putting in a passive raft at the moment, saving €10,000 between quotes for exact same product.

    Can you give me the name of the company you found cheapest. Thanks


  • #9
    galwaytt
    Registered Users, Registered Users 2 Posts: 12,822 ✭✭✭✭galwaytt


    derferjam wrote: »
    jez this house will be the death of me... the architect said that it is going to have to be a raised foundation with raft foundation.... anyone with such experences

    The architect is the wrong guy for a start. What sort of foundation you use will be guided by your engineer. He may put options on the table.

    I'm not sure what "raised foundation with raft" means - doesn't make much sense to me.

    Ode To The Motorist

    “And my existence, while grotesque and incomprehensible to you, generates funds to the exchequer. You don't want to acknowledge that as truth because, deep down in places you don't talk about at the Green Party, you want me on that road, you need me on that road. We use words like freedom, enjoyment, sport and community. We use these words as the backbone of a life spent instilling those values in our families and loved ones. You use them as a punch line. I have neither the time nor the inclination to explain myself to a man who rises and sleeps under the tax revenue and the very freedom to spend it that I provide, and then questions the manner in which I provide it. I would rather you just said "thank you" and went on your way. Otherwise I suggest you pick up a bus pass and get the ********* ********* off the road” 



  • #10
    derferjam
    Registered Users, Registered Users 2 Posts: 197 ✭✭derferjam


    What I have been told was that I would have to use soil to rise the ground level and then put in a raft foundation.
    The raised ground level is due to the getting a slope to the septic tank.
    Then a raft foundation must be used on account of the fresh soil being used they don't believe that it would with stand the weight of a house.


  • #11
    sydthebeat
    Subscribers Posts: 42,171 ✭✭✭✭sydthebeat


    derferjam wrote: »
    What I have been told was that I would have to use soil to rise the ground level and then put in a raft foundation.
    The raised ground level is due to the getting a slope to the septic tank.
    Then a raft foundation must be used on account of the fresh soil being used they don't believe that it would with stand the weight of a house.

    if the choices are a standard strip foundation and moving the septic tank

    versus

    a raft foundation on raised site conditions to fall to septic tank



    i know which one id be choosing....


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  • #12
    kieran.
    Registered Users, Registered Users 2 Posts: 1,175 ✭✭✭kieran.


    I'd ask your consultant if using a pumped system for your septic tank is an option rather using than a raft foundation.


  • #13
    galwaytt
    Registered Users, Registered Users 2 Posts: 12,822 ✭✭✭✭galwaytt


    derferjam wrote: »
    What I have been told was that I would have to use soil to rise the ground level and then put in a raft foundation.
    The raised ground level is due to the getting a slope to the septic tank.
    Then a raft foundation must be used on account of the fresh soil being used they don't believe that it would with stand the weight of a house.

    Told by whom ? Arch or Engineer ? If Arch, see my earlier post.

    Me, I'd be doing a raft every time. Pipework can be made to do anything.

    Ode To The Motorist

    “And my existence, while grotesque and incomprehensible to you, generates funds to the exchequer. You don't want to acknowledge that as truth because, deep down in places you don't talk about at the Green Party, you want me on that road, you need me on that road. We use words like freedom, enjoyment, sport and community. We use these words as the backbone of a life spent instilling those values in our families and loved ones. You use them as a punch line. I have neither the time nor the inclination to explain myself to a man who rises and sleeps under the tax revenue and the very freedom to spend it that I provide, and then questions the manner in which I provide it. I would rather you just said "thank you" and went on your way. Otherwise I suggest you pick up a bus pass and get the ********* ********* off the road” 



  • #14
    Elsie161211
    Registered Users, Registered Users 2 Posts: 19 ✭Elsie161211


    Hi, I'm waiting on my engineer to come back with the specifications on my raft foundation. Is there a standard spec of materials like the steel or is every raft foundation different. I've been told that some engineers go way overboard on the specs just to cover themselves. While I don't want to skimp on the raft foundation, I also don't want to waste money needlessly.


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