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Roof pitch and choice of rooftile?

  • 18-08-2009 8:27am
    #1
    Dinarius
    Registered Users, Registered Users 2 Posts: 3,435 ✭✭✭


    We're building a kitchen extension with a roof that has a pitch of 19 degrees.

    We haven't yet chosen a rooftile but I'm learning fast that the choice below 22.5 degrees is extremely limited.

    One tile we're considering is this one>

    http://www.monier.co.uk/products/product-catalogue/product-range/product/mockbond-mini-stonewold.html

    Two questions:

    Any other tiles we might consider?

    What is the safety margin of error? Would it be OK to be right on the manufacturer's minimum recommended pitch?

    Thanks.

    D.


Comments

  • #2
    Slates
    Registered Users, Registered Users 2 Posts: 347 ✭✭Slates


    Tegral supply a Melbourn slate that can be laid at a 15° with a max rafter length of 5.5m


  • #3
    gman2k
    Registered Users, Registered Users 2 Posts: 4,076 ✭✭✭gman2k


    You can go lower than the (generally recommended 22.5deg) min slope.
    The likes of Tegral tech dept should give you exact specs if you are using their product.
    The build up will change slightly - consider the following;
    Breathable underlay with larger overlap,
    counterbattens,
    Increased headlap on the slates themselves.
    On extremely low pitches, the use of a complete waterproof layer underneath is necessary.
    I suggest you liaise with the tech dept of whichever product you go with for the exact specs to match the slope.


  • #4
    Mellor
    Registered Users, Registered Users 2 Posts: 40,232 ✭✭✭✭Mellor


    Dinarius wrote: »
    Any other tiles we might consider?
    Teagral as mentioned.
    What is the safety margin of error? Would it be OK to be right on the manufacturer's minimum recommended pitch?
    The company's guarantee covers you to their minimum pitch. However, I'd rather not get too close to it if I could (eg on a pitch of 18 if choices were 15 or 17 min, I'd take 15, always). There are two reasons for this, one is it is less likely to fail the further away from the minimum. And also, say you were to build on the minimun, on site tolerances could see the actual roof vary +/- 1 degree. And you don't want to be in a situation were your roof is 0.5 or so below minimum.


  • #5
    PeteHeat
    Registered Users, Registered Users 2 Posts: 648 ✭✭✭PeteHeat


    Hi Dinarius,

    My advice is to dump the UK spec sheets, if you look at an Irish spec sheet for Stonewold you won't find one below 22.5, the UK sheets refer to a complete system not the tile.

    I suggest that you look at copper or zinc panels, failing that as an option fit a decent built up roof, they are honest with no major dependence on underlay that you can't see.

    One of the reasons I got tired of the roofing biz was the industry was going the American route depending on miracle underlays instead of good roofing practice.

    Regards,

    Rooferpete.

    .


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