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Garage on slope

  • 24-02-2020 8:34pm
    #1
    Registered Users, Registered Users 2 Posts: 4,609 ✭✭✭


    Not sure if I should post here or in Construction & Planning.

    I want to install a Steeltech/Adman type garage but the site has a steep slope downwards from front to back.

    I'm thinking about building block walls on the sides to bring the lower end up to the front level and then spanning them (4 metre span) with hollowcore or similar. It needs to support a vehicle so I don't think wooden joists would suit. The floor will give me some additional storage space beneath it for gardening stuff (access from the back).

    I'm having difficulty getting a response from hollowcore suppliers for pricing and availability. Any recommendations?

    Is this the best way to go or should I be considering a different approach?


Comments

  • Registered Users, Registered Users 2 Posts: 12,745 ✭✭✭✭Calahonda52


    So are you planning to build the foundations in line with slope and then build triangular shaped block walls, which will then be loaded with HC and a vehicle.
    And you are the going to be able to walk in at the back under the HC.
    .
    If so, it is downright dangerous, IMO

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



  • Registered Users, Registered Users 2 Posts: 4,609 ✭✭✭blackbox


    So are you planning to build the foundations in line with slope and then build triangular shaped block walls, which will then be loaded with HC and a vehicle.
    And you are the going to be able to walk in at the back under the HC.
    .
    If so, it is downright dangerous, IMO

    The walls wouldn't be triangular or they might slip down the hill - will be in one or two steps.

    Why would it be dangerous if floor is rated for load?


  • Registered Users, Registered Users 2 Posts: 1,346 ✭✭✭TheW1zard


    Just build it up and build flat. Bit of landscaping!
    What your describing wont last i reckon


  • Registered Users, Registered Users 2 Posts: 23,593 ✭✭✭✭mickdw


    Should be fine with proper foundation built level or stepped.
    Walls need to be of suitable width also to avoid buckling issues. You could add some further piers etc to support walls.
    Hollowcore company will design the slab but will generally require details of any special loads being applied to floor.


  • Registered Users, Registered Users 2 Posts: 31,206 ✭✭✭✭Lumen


    What's the height difference?


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  • Registered Users, Registered Users 2 Posts: 158 ✭✭dubbrin


    mickdw wrote: »
    Should be fine with proper foundation built level or stepped.
    Walls need to be of suitable width also to avoid buckling issues. You could add some further piers etc to support walls.
    Hollowcore company will design the slab but will generally require details of any special loads being applied to floor.

    This ^^

    Proper foundation + proper wall + proper slab + shed = right job

    Don't mind any of the rest, once it's done properly you're away. Ask someone in the know to specify the width and depth of foundations. Ask them to specify the wall size and any extra piers as above. A hollowcore slab company can deliver and position. The shed company will build on this as long as the size is right so consult them early. You'll have gaps in the floor to underneath if you don't pour a finish screed though.


  • Registered Users, Registered Users 2 Posts: 31,206 ✭✭✭✭Lumen


    dubbrin wrote: »
    You'll have gaps in the floor to underneath if you don't pour a finish screed though.
    That could be a handy feature.


  • Registered Users, Registered Users 2 Posts: 12,745 ✭✭✭✭Calahonda52


    blackbox wrote: »
    The walls wouldn't be triangular or they might slip down the hill - will be in one or two steps.

    Why would it be dangerous if floor is rated for load?

    Its not just the floor, its the walls, foundations, soil propensity to shear when wet etc etc.
    Stepped foundations might be better but they need to be keyed like retaining walls.
    As suggested earlier, a bit of cut and fill and approved hardcore

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



  • Registered Users, Registered Users 2 Posts: 4,609 ✭✭✭blackbox


    Its not just the floor, its the walls, foundations, soil propensity to shear when wet etc etc.
    Stepped foundations might be better but they need to be keyed like retaining walls.
    As suggested earlier, a bit of cut and fill and approved hardcore

    The front one third of the garage will be on ground that is already level. I reckon I'll have to build a retaining wall across it to prevent slippage of this part. Deepest point is less than 2m.

    After the garage is installed I intend to put in a dampcourse and screed.

    I had considered building two sections with a gap between them that I could use as a garage pit, but I would probably get more value out of the storage space.


  • Registered Users, Registered Users 2 Posts: 34,177 ✭✭✭✭listermint


    2 meters is alot. I had assumed the slope was only slight.


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  • Registered Users, Registered Users 2 Posts: 1,346 ✭✭✭TheW1zard


    Build a wall on the back side, making sure your foundation is in solid ground. Build the two side walls.
    Fill it in. Mesh and 150.


  • Registered Users Posts: 1,165 ✭✭✭Mr Tickle


    blackbox wrote: »
    The front one third of the garage will be on ground that is already level. I reckon I'll have to build a retaining wall across it to prevent slippage of this part. Deepest point is less than 2m.

    After the garage is installed I intend to put in a dampcourse and screed.

    I had considered building two sections with a gap between them that I could use as a garage pit, but I would probably get more value out of the storage space.

    Just put something heavy in the front third.


  • Registered Users, Registered Users 2 Posts: 4,609 ✭✭✭blackbox


    TheW1zard wrote: »
    Build a wall on the back side, making sure your foundation is in solid ground. Build the two side walls.
    Fill it in. Mesh and 150.

    I've considered that but I'd like to make use of the space underneath.


  • Registered Users, Registered Users 2 Posts: 34,177 ✭✭✭✭listermint


    blackbox wrote: »
    I've considered that but I'd like to make use of the space underneath.

    You won't use the space underneath.

    Concentrate on making it safe to carry the weights your talking about . Leave the space underneath to dreamers.


  • Registered Users, Registered Users 2 Posts: 1,346 ✭✭✭TheW1zard


    Its not slippage your stopping, its subsidance.
    Your garage will settle over time.


  • Registered Users, Registered Users 2 Posts: 1,346 ✭✭✭TheW1zard


    Your best bet is to build two walls with strip foundations. One at the start of the slope and one at the back. Then your side walls. Then fill the slope in (in between the two strips)
    Then mesh screed etc


  • Registered Users, Registered Users 2 Posts: 23,593 ✭✭✭✭mickdw


    What the op is proposing is not rocket science.
    Yes, it needs professional input but is not a big ask.
    A plot with a slope that will allow a walk in inspection pit that can freely drain out the open side sounds to me like too good an opportunity to turn down if you are into such things.


  • Registered Users, Registered Users 2 Posts: 1,346 ✭✭✭TheW1zard


    With enough money and rc anythings possible


  • Registered Users, Registered Users 2 Posts: 31,206 ✭✭✭✭Lumen


    I assume it is your intention for it to be planning exempt, or you wouldn't be asking in a DIY forum.

    You need to calculate the effective height for planning. It's really a question for the Construction and Planning forum, but as I understand it the planners take their measurement from the lowest point (technically of the site, but in practice around the structure) to the highest.

    If there's a 2m elevation change, you are likely to end up breaching height restrictions for the highest point of the roof.

    Which means it won't be planning exempt.

    This is looking to me like a not insignificant undertaking.


  • Registered Users, Registered Users 2 Posts: 23,593 ✭✭✭✭mickdw


    Planning while holding things back a bit wouldn't have a major cost for such a shed in most cases.


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  • Registered Users, Registered Users 2 Posts: 4,609 ✭✭✭blackbox


    Lumen wrote: »
    I assume it is your intention for it to be planning exempt, or you wouldn't be asking in a DIY forum.

    You need to calculate the effective height for planning. It's really a question for the Construction and Planning forum, but as I understand it the planners take their measurement from the lowest point (technically of the site, but in practice around the structure) to the highest.

    If there's a 2m elevation change, you are likely to end up breaching height restrictions for the highest point of the roof.

    Which means it won't be planning exempt.

    This is looking to me like a not insignificant undertaking.

    I'm on a hillside. The lowest point of the site is about 20 metres further down. The highest point (entrance gate) is probably 20 metres higher - well above the roof of the house.

    The garage base will be at pretty much the same elevation as the house base. The build up to level the garage will be less than 2 metres.


  • Registered Users, Registered Users 2 Posts: 31,206 ✭✭✭✭Lumen


    blackbox wrote: »
    I'm on a hillside. The lowest point of the site is about 20 metres further down. The highest point (entrance gate) is probably 20 metres higher - well above the roof of the house.

    The garage base will be at pretty much the same elevation as the house base. The build up to level the garage will be less than 2 metres.

    Right, but with a pitched roof you're limited under exempted development to 4m to the ridge (3m with flat roof), so I can't see how you can do this without planning permission.

    In theory you can raise the level of the ground up to 1m without planning, but then you're really into the weeds of interpretation of planning laws.


  • Registered Users, Registered Users 2 Posts: 23,593 ✭✭✭✭mickdw


    Lumen wrote: »
    Right, but with a pitched roof you're limited under exempted development to 4m to the ridge (3m with flat roof), so I can't see how you can do this without planning permission.

    In theory you can raise the level of the ground up to 1m without planning, but then you're really into the weeds of interpretation of planning laws.

    I know of a section 5 that went to council 're a large flat roofed extension on a sloping site that required 1.8m height rising walls before floor level with the majority of those walls exposed externally at the lower end of the extension. Section 5 granted and drawings as submitted where pretty clear as to exposed height at all sides.
    Seems planners have differing interpretations too.
    I told that person not to even try for the section 5 declaration .... made me look silly.


  • Registered Users, Registered Users 2 Posts: 4,609 ✭✭✭blackbox


    Job Done (at last).

    535741.jpg

    535739.jpg

    I got a contractor to do the foundation.


  • Registered Users, Registered Users 2 Posts: 2,511 ✭✭✭Purgative


    Looks a tidy enough job Blackbox. Good luck with it.


  • Registered Users, Registered Users 2 Posts: 123 ✭✭kil


    Nice job blackbox and thanks for updating the thread. So many threads never get concluded.


  • Registered Users, Registered Users 2 Posts: 23,593 ✭✭✭✭mickdw


    Thats not going to fall anyway.
    Only thing id say is the hollowcore ends could have been hidden for a tidier finish but its a fine shed.


  • Registered Users, Registered Users 2 Posts: 4,310 ✭✭✭Pkiernan


    listermint wrote: »
    You won't use the space underneath.

    Concentrate on making it safe to carry the weights your talking about . Leave the space underneath to dreamers.

    Lol


  • Registered Users, Registered Users 2 Posts: 34,177 ✭✭✭✭listermint


    Pkiernan wrote: »
    lol

    winning the internet everyday Keirno. Its Friday, go rub a cat and have some tea.


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  • Registered Users, Registered Users 2 Posts: 7,311 ✭✭✭The Continental Op


    Given the slope and the obvious way of getting ventilation I think I'd have had to have incorporated an inspection pit.

    Wake me up when it's all over.



  • Registered Users, Registered Users 2 Posts: 4,609 ✭✭✭blackbox


    Given the slope and the obvious way of getting ventilation I think I'd have had to have incorporated an inspection pit.

    I considered it but it was going to be have more complexity than I was prepared to take on.


  • Registered Users, Registered Users 2 Posts: 12,745 ✭✭✭✭Calahonda52


    blackbox wrote: »
    I considered it but it was going to be have more complexity than I was prepared to take on.

    It's a mighty mighty job, a credit to your skills, with a little help from the lads here.:D
    you could store rebar in the HC :)

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



  • Posts: 14,344 ✭✭✭✭ [Deleted User]


    Just out of curiousity, blackbox, what's the ceiling height of the ceiling space on the rear? Can you stand up in it? Also, do you plan to put anything on there to enclose it?


    Looks a good, tidy job.


  • Registered Users, Registered Users 2 Posts: 12,745 ✭✭✭✭Calahonda52


    Just out of curiousity, blackbox, what's the ceiling height of the ceiling space on the rear? Can you stand up in it? Also, do you plan to put anything on there to enclose it?


    Looks a good, tidy job.
    He could store decommissioned Soviet era mortar launchers. :)
    https://www.rte.ie/news/ireland/2020/1210/1183616-mortar-launcher/

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



  • Registered Users, Registered Users 2 Posts: 4,609 ✭✭✭blackbox


    Just out of curiousity, blackbox, what's the ceiling height of the ceiling space on the rear? Can you stand up in it? Also, do you plan to put anything on there to enclose it?


    Looks a good, tidy job.

    No, you can't stand up in it. Just over 1 metre.

    Not planning to enclose it - ventilation. Thinking of drying logs in it.


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