Advertisement
If you have a new account but are having problems posting or verifying your account, please email us on hello@boards.ie for help. Thanks :)
Hello all! Please ensure that you are posting a new thread or question in the appropriate forum. The Feedback forum is overwhelmed with questions that are having to be moved elsewhere. If you need help to verify your account contact hello@boards.ie
Hi there,
There is an issue with role permissions that is being worked on at the moment.
If you are having trouble with access or permissions on regional forums please post here to get access: https://www.boards.ie/discussion/2058365403/you-do-not-have-permission-for-that#latest

New 80 sq m flat roof. Advice needed.

  • 18-11-2011 12:32pm
    #1
    cgarrad
    Registered Users, Registered Users 2 Posts: 1,611 ✭✭✭


    I'm removing a part apex, part gentle pitch roof and replacing it with a 80 sq m flat roof.

    I will get better room in the upper story and not piss off my neighbors with any height gain.

    Don't want to use felt and am leaning towards fiberglass as a friend in England does it for a living.

    Any options on the easiest way to build the roof, I was going to use <SNIP> centers with 18mm ply and then fiberglass and insulate the underside.

    Is there a better way with all the new product available now?


    Mod edit: Please read the forum charter. We dont allow discussion on structural elements. Thanks.


Comments

  • #2
    Wally Runs
    Registered Users, Registered Users 2 Posts: 588 ✭✭✭Wally Runs


    Now, just something to consider. I have quite a bit of flat roof on my home from an extension renovation in 2009 and I found it more difficult to get home insurance.

    The reason being it made up more than 50% of the roof area so I was limited to a more select set of providers. The roof material was Trocal (high spec, 25 year life etc) and so on but the insurance folk just see it as a flat roof. Each insurance provider has their own rules. Just something to consider. If I could go back I would have put in a pitch.

    Mind you I have no idea how little pitch you need to stop being a flat roof.


  • #3
    DOCARCH
    Moderators, Home & Garden Moderators, Science, Health & Environment Moderators Posts: 18,745 Mod ✭✭✭✭DOCARCH


    Firstly the roof structure is exactly as it says, a structure, for that size of roof you need to/should get a structural engineer to size the roof timbers, etc.

    With regard to the roof finish, I use fibreglass a lot and find it very good for flat roofs but just make sure you use a company that gives you a wtitten garuntee/warranty on the work (usually 25 years for fibreglass) as this will help with your house insurance (as Wally suggests).

    Generally the fibreglass is laid on OSB 3 board with insulation under the OSB (usually on ply fixed to joists/firring pieces).


  • #4
    BryanF
    Moderators, Home & Garden Moderators Posts: 10,146 Mod ✭✭✭✭BryanF


    consult an eng or arch. this may need planning permission


  • #5
    cgarrad
    Registered Users, Registered Users 2 Posts: 1,611 ✭✭✭cgarrad


    Sorry about the structural part :rolleyes:

    Not too worried about insurance as I dont have any :eek:

    Architect I spoke to said its exempt.

    Anyone know the major suppliers of roofing fiberglass here?


Advertisement