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Terraced House Extension

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  • 29-07-2020 4:31pm
    #1
    EvanUpwards
    Registered Users Posts: 30 ✭


    Hi,

    This could be a silly question but I'm asking anyway!
    We are to build a small 24m2 ground floor kitchen extension and looking into construction methods. I'm interested in SIPS as they seem to offer a simple and relatively quick solution.
    Currently we have single storey extensions either side of us, 1 longer than we will build out to, the other shorter. I'm just wondering on how the outer leaf is achieved in either a SIPS or Timber frame build in this scenario as it's unlikely we can build up against our neighbours walls.
    How are SIPS dealt with is this case?
    Can we have a block/brick outer leaf tied to a timber inner leaf and if so how is this achieved having to work back from the outer?

    Cheers


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    #2
    Gumbo
    Moderators, Society & Culture Moderators Posts: 38,435 Mod ✭✭✭✭Gumbo


    EvanUpwards wrote: »
    Hi,

    This could be a silly question but I'm asking anyway!
    We are to build a small 24m2 ground floor kitchen extension and looking into construction methods. I'm interested in SIPS as they seem to offer a simple and relatively quick solution.
    Currently we have single storey extensions either side of us, 1 longer than we will build out to, the other shorter. I'm just wondering on how the outer leaf is achieved in either a SIPS or Timber frame build in this scenario as it's unlikely we can build up against our neighbours walls.
    How are SIPS dealt with is this case?
    Can we have a block/brick outer leaf tied to a timber inner leaf and if so how is this achieved having to work back from the outer?

    Cheers

    Both of these methods you mentioned are off standard construction so you need an engineer or professional sign off. They really should be advising you based on the actual conditions on site. Will there be access for an external leaf? How will it be constructed. Foundations?


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    #3
    EvanUpwards
    Registered Users Posts: 30 ✭EvanUpwards


    Thanks for the reply Gumbo. I should clarify, I'm looking to hire professionals for the job from start to finish. I'm asking really for two reasons, 1 is that I am just curious as I have an interest in building and want to discuss options with the architect, the 2nd is that I'd like to chat with the neighbours regarding how it may impact them, especially the shorter wall where we will be extending past them.
    I can't see there being any access for an external leaf tbh. Any thoughts on SIPS for a terraced house extension in general?
    Thanks


  • Options
    #4
    JimmyMW
    Registered Users Posts: 695 ✭✭✭JimmyMW


    EvanUpwards wrote: »
    Hi,

    This could be a silly question but I'm asking anyway!
    We are to build a small 24m2 ground floor kitchen extension and looking into construction methods. I'm interested in SIPS as they seem to offer a simple and relatively quick solution.
    Currently we have single storey extensions either side of us, 1 longer than we will build out to, the other shorter. I'm just wondering on how the outer leaf is achieved in either a SIPS or Timber frame build in this scenario as it's unlikely we can build up against our neighbours walls.
    How are SIPS dealt with is this case?
    Can we have a block/brick outer leaf tied to a timber inner leaf and if so how is this achieved having to work back from the outer?

    Cheers

    Your only building essentially between two walls from what I can gather, I cant see block work taking too much time in comparison, also considering its a terrace extension consider pumping the relatively small volume of concrete into the sips, also id imagine you will have a large slider or bifold therefore the amount of wall will be minimum anyway


  • Options
    #5
    Calahonda52
    Registered Users Posts: 12,194 ✭✭✭✭Calahonda52


    The starting point is what is the nature and location of the two extensions either side?
    Are they built on the boundary or inside or what?
    How is the rain run off dealt with in them?

    Foundations will be an issue from a width point of view.
    Typically they are 3 times the width of the wall so could be a meter wide, with the wall in the middle of the meter.

    “I can’t pay my staff or mortgage with instagram likes”.



  • Options
    #6
    EvanUpwards
    Registered Users Posts: 30 ✭EvanUpwards


    JimmyMW, Cheers for the reply. Yep that's right, large slider or bifold on the end so wall surface is at a minimum. Can I ask what you mean by pumping concrete into the SIPS?


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    #7
    EvanUpwards
    Registered Users Posts: 30 ✭EvanUpwards


    Calahonda52 wrote: »
    The starting point is what is the nature and location of the two extensions either side?
    Are they built on the boundary or inside or what?
    How is the rain run off dealt with in them?

    Foundations will be an issue from a width point of view.
    Typically they are 3 times the width of the wall so could be a meter wide, with the wall in the middle of the meter.

    The longer extension is built on the boundary wall centered, the shorter extension on the inside of their property.
    They are both single storey kitchen extensions, both are capped with rain run off to gutters at the back so no drains or gutters on either side.
    These extensions were both built in the 80's and not very well built tbh!

    What could be done with the foundations if it turns out to be an issue?
    Thanks


  • Options
    #8
    JimmyMW
    Registered Users Posts: 695 ✭✭✭JimmyMW


    EvanUpwards wrote: »
    JimmyMW, Cheers for the reply. Yep that's right, large slider or bifold on the end so wall surface is at a minimum. Can I ask what you mean by pumping concrete into the SIPS?

    Sorry OP I had ICP's in my head when I was reading your post, ignore my comment about the concrete


  • Options
    #9
    sydthebeat
    Subscribers Posts: 40,981 ✭✭✭✭sydthebeat


    Will you need cranes to lift SIPs walls over your house for this extension?

    That might make the cost comparison to blockwork unequal


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    #10
    EvanUpwards
    Registered Users Posts: 30 ✭EvanUpwards


    JimmyMW wrote: »
    Sorry OP I had ICP's in my head when I was reading your post, ignore my comment about the concrete

    Ah I get you now. I had myself confused!


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    #11
    EvanUpwards
    Registered Users Posts: 30 ✭EvanUpwards


    sydthebeat wrote: »
    Will you need cranes to lift SIPs walls over your house for this extension?

    That might make the cost comparison to blockwork unequal

    Good point, I'm looking into that too. We have no houses behind us, there is a large open area where access could possibly be granted for short term use.
    I'm gathering most of ye here are suggesting going the blockwork route. I've no issues with a blockwork build, was just hoping there might be a speedier/cheaper route. If going blockwork what would ye use for the outer leaf? Brick? Or is exposed concrete block acceptable? The neighbour with the short extension has exposed blockwork on our side.


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    #12
    Calahonda52
    Registered Users Posts: 12,194 ✭✭✭✭Calahonda52


    An important issue with exposed block on the outside face of what I presume is a cavity wall is that it adds to the complexity around airtightness and thermal looping as the block is not airtight.

    The key thing here is whats state the foundation along the wall are at.
    Depending on budget, anything is possible: eg, outer steel frame with everthing else built inside it

    “I can’t pay my staff or mortgage with instagram likes”.



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    #13
    Gumbo
    Moderators, Society & Culture Moderators Posts: 38,435 Mod ✭✭✭✭Gumbo


    Shouldn’t use exposed block.
    It’s strictly prohibited in the spirit of the exemptions.
    Plus it goes against the declaration of performance from the manufacture with regards to length of time they are exposed.

    You can buy a finished block that can be laid from the inside as you go up.

    Your comment about trying to find a cheaper way of building is what stands out here. Realistically there isint. Standard construction methods will always be cheaper than bespoke modular build like SIPS etc


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    #14
    JimmyMW
    Registered Users Posts: 695 ✭✭✭JimmyMW


    Consider a brick outer leaf, attractive finish for continuity


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