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Extension Help

  • 06-07-2008 9:49pm
    #1
    cunnins4
    Closed Accounts Posts: 882 ✭✭✭


    Hi folks, I need a bit of advice with design of an extension for a family friend.

    Basically I'm entering my 4th year of structural engineering and have gained quite a lot of skill with the 'ole autocad, so I was asked to help them with the design of their single storey extension. I said I'd do my best, although I feel a bit out of my depth!

    Anyways, I've designed the whole thing in Google Sketchup to give them a 3D model of the extension and drawn up plans and elevations of the extension to what they want, but I'm a bit unsure of whether these will be sufficient for the builder? Will he need exact measurements of walls etc... or is it more of a "to the closest brick" kinda thing? Do I need to specify exactly the type of wall construction, roof dimensions, foundation, floor construction, insulation etc... in the drawings or is that up to him to decide?

    The drawings are pretty much to scale and are in proportion-I took measurements with the world's worst tape though! The builder has a good reputation and afaik is another friend and they've seen his work, but I'm more worried about what I'm doing? Should the builder take my drawings as an idea of what's required and go off and get another engineer to draw them?

    Apologies for the long post, but I don't want to fcuk this up! I'm gonna head into college tomorrow and have a good look at the homebond manual as I'd imagine that would have a lot of help in it.

    Any advice is much appreciated!


Comments

  • #2
    Mellor
    Registered Users, Registered Users 2 Posts: 39,902 ✭✭✭✭Mellor


    cunnins4 wrote: »
    Anyways, I've designed the whole thing in Google Sketchup to give them a 3D model of the extension and drawn up plans and elevations of the extension to what they want, but I'm a bit unsure of whether these will be sufficient for the builder? Will he need exact measurements of walls etc... or is it more of a "to the closest brick" kinda thing? Do I need to specify exactly the type of wall construction, roof dimensions, foundation, floor construction, insulation etc... in the drawings or is that up to him to decide?

    The drawings are pretty much to scale and are in proportion-I took measurements with the world's worst tape though! The builder has a good reputation and afaik is another friend and they've seen his work, but I'm more worried about what I'm doing? Should the builder take my drawings as an idea of what's required and go off and get another engineer to draw them?

    He will need pretty exact mearsurements, over all dims to the the mm at least, including heights also. Internal dims for door position is not as important. But only take 5 secs to include.

    Im not sure what you mean by pretty much to scale, with Cad they should be spot on. Or are you refering to print scale. You should have enough dims on it so that nobody ever needs to scale off the drawing.


  • #3
    cunnins4
    Closed Accounts Posts: 882 ✭✭✭cunnins4


    Sorry, I should've said "are pretty much exact", not "to scale"! what I mean is I think all of the measurements I took when I was out at the house are fairly spot on. I'll have to re-check them though I guess.

    Thankfully there's only one new door going inside, and then just the patio doors and the velux windows in the roof.


  • #4
    Slig
    Registered Users, Registered Users 2 Posts: 1,550 ✭✭✭Slig


    The reason you draw plans is to PLAN out the building. Its a futile exercise if the builder has to use his own iniative to build it.
    If the builder works to a 50mm tolerence and your drawings are out by the same through bad dimensioning (2137mm is not a correct dimension) or careless drawing (walls not parallel or perpendicular or the wrong thickness) then it can easily be the difference between a part M toilet being compliant or not.
    When you are placing doors make them min 100mm from a wall junction and 200mm from another door to allow architraves to be put in. Try and design the windows and doors to fit into the blockwork dimensions. The builder will obviously move some items to work on site but these should be kept to a minimum.


  • #5
    cunnins4
    Closed Accounts Posts: 882 ✭✭✭cunnins4


    Thanks for that. Thankfully it's a fairly simple design, 3 walls, a roof and a few windows-nothing overly complex! They haven't decided on the sizes of their windows yet, so I'll probably have to change them anyways.

    It's a good learning experience, but tbh I should've just said no!!!

    Thanks for the replies guys!


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