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concrete flat roof

  • 01-05-2008 2:12pm
    #1
    zenzen
    Closed Accounts Posts: 169 ✭✭


    Hi everyone, sorry for all the recent questions, I am doing plans for my house at the moment and don't know much so have loads of questions!! Appreciate the advice so far, thanks. Basically the plan is to knock down the walls for the house there currently and rebuild it exactly as it was with proper walls. However I would like to extend the original house out the back to have a kitchen.

    I have been advised a pitched roof wouldn't be great as the way it would meet the original roof would mean there would be no velux window, and no light into the dining room (its an old cottage). A flat roof was suggested but I didn't like the sound of it. I just have awful notions of felt flat roofs. What do the experts on here think?! Anyway it was suggested I could have a concrete flat roof that could be accessed via an outside stairs so it would be like an outside balcony. Would having a concrete flat roof be a bad idea? Would it cause problems settling because it would be heavier than the rest of the house? Any ideas welcome!

    zenzen


Comments

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


    If you intend to knock down the existing house then dont build it back up to cause the same problems. If you have issues with lighting a room as it is then rethink the layout to sort the problem.
    personally I dont like the idea of knocking down a cottage and rebuilding it with a cavity wall, if you want a new house then build a new house it will be cheaper and cause less problems and you'll still need planning permission.
    Concrete flat roofs can have exactly the same problems as timber flat roofs, its the membranes and roof build up that will make the difference. some of the new generation membranes will guarantee up to 25 years, but if your going with a roof terrace then the build up is the important consideration. Think about:

    -concrete paving slabs
    -pea gravel (100mm)
    -membrane protection layer
    -water proof membrane (bitumen or trocal etc.)
    -rigid insulation
    -reinforced concrete screed on hollowcore slabs

    The above is just one possible build up, and as this is a specialist detail that could cause problems in the future if it leaks then it should be designed, built and inspected by someone with PI insurance.


  • #3
    sydthebeat
    Subscribers Posts: 41,863 ✭✭✭✭sydthebeat


    as an aside zenzen, in order to knock down the cottage and rebuild it, you need permission.
    you also need permission to use the flat roof as a balcony / roof garden.

    so, as slig says above, why not redesign the new build to alter the layout and omit this problem of rooflights. Whilst contemporary flat roof, once built correctly, can be immeasurably better than one of say 20 years ago...... a pitched roof would negate and issues....


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