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Housing - New Build: Achieving a flush threshold inside/out with SIPS

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    Hello. First post. Be gentle, please!

    We're just in the design stages of our SIPS build. We want to achieve a flush threshold from the kitchen out on to the patio. However, apparently Kingspan warranties are such that they require any structural timber to be 150mm above ground level.

    Would welcome any thoughts/suggestions on how to stick within the warranty - but also achieve a flush access inside to out?
  2.  
    IMO a flush threshold from inside to out is not a good idea - without a step of some sort sooner or later the outside will venture inside. Even if the patio has a roof blown rain or snow may still cause a problem.

    What do Kingspan define as ground level? Options could include finished floor level if talking about the patio as the relevant 'ground', DPC or site ground level
    • CommentAuthorDarylP
    • CommentTimeFeb 25th 2016
     
    ....'raise' the patio to ffl, but with a clear space between the o/s of the wall, perhaps 15mm or so wide.
    We did this, using those 'twisting slab supports', the actual ground was circa 8" below the ffl, but with the patio slabs brought up to ffl.
    Good luck...:surprised:
  4.  
    Thanks DarylP. In my non-expert way, I had been thinking along the same lines... but wasn't sure whether the 'clear space' that you mentioned could/should be replaced with an Aco/French Drain (there will be sliding doors between the kitchen and patio)
    •  
      CommentAuthordjh
    • CommentTimeFeb 25th 2016
     
    Aco, and others, make special narrow slot drains for this purpose, but we just built a small gap between the sill and the patio like Daryl suggests. Do make sure that there's somewhere for the water to drain once it goes down through the gap - a solid concrete subbase is not going to help in that place! And make sure the patio drains away from the door! As Peter says, a completely level threshold can cause grief, so a low raised waterbar can be a good idea and is fine for wheelchairs and shuffling people if designed to standard. Or else make sure that whatever flooring is inside the threshold is easily swept and mopped.
  6.  
    You could also consider a decked area instead of a solid patio.
    • CommentAuthorCWatters
    • CommentTimeFeb 25th 2016 edited
     
    IMO a flush threshold from inside to out is not a good idea - without a step of some sort sooner or later the outside will venture inside.


    All new houses in England and Wales must have a level access to comply with Part M of the Building Regs. Normal solution is to so what djh mentions. Typical cross section is here..

    https://www.specifiedby.com/regulations/img/130.png

    Will have to ask kingspan if you can put a linear drain/gap all around the house.

    Perhaps have several courses of bricks to rest the SIP frame on?
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      CommentAuthordjh
    • CommentTimeFeb 26th 2016 edited
     
    Posted By: CWattersWill have to ask kingspan if you can put a linear drain/gap all around the house.

    I'm not clear why anybody would want to do that? The usual answer apart from at thresholds is a French drain covered by gravel about 500 mm - 1000 mm wide, I think. And it can usefully be 150 mm lower than the wall.

    Perhaps have several courses of bricks to rest the SIP frame on?

    This is one of the main difficulties with SIPs, I believe. How to fully support their base without the thermal bridge that normal materials like brick or concrete imply. But I've never looked into that issue.
  9.  
    If you use an insulated raft foundation the SIP frame can sit on the slab and the insulation surrounding the slab can join onto external insulation attached to the SIP OSB so there isn't a thermal bridge at the sole plate.
    • CommentAuthorDarylP
    • CommentTimeFeb 27th 2016
     
    :bigsmile: +1

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