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Floor Insulation hack ? Steel Shed concrete Base

  • 21-05-2019 10:44am
    #1
    Mrfool35
    Registered Users Posts: 16 ✭


    Hi I have a 5x4m 40mm Composit steel shed ordered and am currently getting the concrete base ready. I am following the steel tech two part pour guide for a concrete base shown in this video.

    https://youtu.be/O8VtjP_Yx8M

    My question is, instead of the second concrete pouring to raise the internal floor slightly, could I just put down sheets of kingspan floor installation to the same debth right over the DPC?
    And then ply over that.

    Or any advice on and how insulation can be incorporated into the method used in the guide video much appreciated.

    Thanks


Comments

  • #2
    Lumen
    Registered Users Posts: 31,008 ✭✭✭✭Lumen


    How are you going to stop water getting under the insulation?


  • #3
    Lumen
    Registered Users Posts: 31,008 ✭✭✭✭Lumen


    FWIW this was the job done by one of the shed suppliers for a friend of mine.

    I'm not sure I could do as good a job.

    20190514-174207.jpg


  • #4
    Mrfool35
    Registered Users Posts: 16 ✭Mrfool35


    Lumen wrote: »
    How are you going to stop water getting under the insulation?



    Was wondering if the DPC would help that.

    Also was wondering if perhaps laying a narrow strip of concrete around the internal perimeter 50x50mm as a step in height, and then laying the 50mm insulated boards inside and flush with that would keep it watertight, if the DPC alone couldn't do the job?


  • #5
    Still waters
    Registered Users Posts: 1,166 ✭✭✭Still waters


    Lumen wrote: »
    How are you going to stop water getting under the insulation?

    there shouldn't be any if it's done correctly


  • #6
    Still waters
    Registered Users Posts: 1,166 ✭✭✭Still waters


    OP is there a reason you don't want to put concrete in second floor ? theres no reason why you can't put 50mm insulation in before the second floor goes in


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  • #7
    Mrfool35
    Registered Users Posts: 16 ✭Mrfool35


    Still waters wrote: »
    OP is there a reason you don't want to put concrete in second floor ? theres no reason why you can't put 50mm insulation in before the second floor goes in

    Mostly to do with the hassle of organising a second pouring, and also trying keeping it as one man job friendly as possible. Also the amount of various materials I need to order to do the job is a headache for a rookie like me, between renting cement mixers, tones of crushed stone, bags of cement, sand etc. Cause both pours come in slightly under the minimum order I could make for premixed concrete.

    Original idea was laying sheets of insulation over the finished 2 part floor, but I'm conscious about internal wall height shrinking everytime the floor is raised.

    So still considering the two part pour and Thanks for the tip. If going for a two part pour with insulation boards below the second floor, at what stage exactly do I lay the insulation boards?

    Thanks!


  • #8
    Still waters
    Registered Users Posts: 1,166 ✭✭✭Still waters


    I'd put insulation on top of the plastic, tape all joints and pour second floor, remember to allow an extra 50 mm for the insulation when setting up

    if you didn't want to concrete it prep the same way allowing the extra 50 mm, plastic, insulation, 2x2 batons every 400(unfixed and cut tight) 18mm ply screwed down to baton, when all is done it shouldn't budge as long as everything is level and sitting right

    if it's only going to be a storage shed I'd be happy with just 25 mm insulation, itll do the same job


  • #9
    Mrfool35
    Registered Users Posts: 16 ✭Mrfool35


    Still waters wrote: »
    I'd put insulation on top of the plastic, tape all joints and pour second floor, remember to allow an extra 50 mm for the insulation when setting up

    if you didn't want to concrete it prep the same way allowing the extra 50 mm, plastic, insulation, 2x2 batons every 400(unfixed and cut tight) 18mm ply screwed down to baton, when all is done it shouldn't budge as long as everything is level and sitting right

    if it's only going to be a storage shed I'd be happy with just 25 mm insulation, itll do the same job

    Thanks a million, that's really helpful!


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