1. Visiting from the US? Why not try DIYnot.US instead? Click here to continue to DIYnot.US.
    Dismiss Notice

Where to cut 2 rafters for skylight

Discussion in 'Roofing and Guttering' started by gasbusters, 15 Jun 2019.

  1. gasbusters

    gasbusters

    Joined:
    27 Sep 2016
    Messages:
    4,672
    Thanks Received:
    456
    Country:
    United Kingdom
    Hello guys, im doing my loft skylight and just realised the rafters are too close for me to get away with cutting one to fit skylight.

    The skylight is 78 x 98cm velux centre pivot. The gap between the two rafters is 76cm.

    So it looks like il have to cut two rafters, which im guessing will considerably weaken the roof?

    Can someone advise qhats tje best way of strenghtening the opening?

    I was going to double up the two joists on either end of the window that have not been cut using 2x6 beams.

    Then double up where the rafters have been cut top and bottom using 2 x 6 beams.

    In the photos I have made a 78x98 template to show where the window will fit

    Any advice would be much appreciated
     
    Last edited: 15 Jun 2019
  2. Sponsored Links
  3. gasbusters

    gasbusters

    Joined:
    27 Sep 2016
    Messages:
    4,672
    Thanks Received:
    456
    Country:
    United Kingdom
  4. noseall

    noseall

    Joined:
    2 Feb 2006
    Messages:
    39,126
    Thanks Received:
    2,481
    Location:
    Staffordshire
    Country:
    United Kingdom
    Everyone will be wondering why you don't move it to left 8" so that you only need remove one rafter.

    Anyhoo, seeing as your Velux is betwixt two purlins, then doubling up the rafters (between purlins) will be ok.
     
    • Thanks Thanks x 1
  5. gasbusters

    gasbusters

    Joined:
    27 Sep 2016
    Messages:
    4,672
    Thanks Received:
    456
    Country:
    United Kingdom
    The gap on the left between rafters is the one thats 76cm, about 3 cm too narrow to fit the window into.

    I was tempted to plane down that rafter buy 3 cm but just enough for the wi dow length then double it up.but not sure its a goid idea
     
  6. catlad

    catlad

    Joined:
    29 Jul 2011
    Messages:
    4,126
    Thanks Received:
    569
    Location:
    Lancashire
    Country:
    United Kingdom
    Sister a rafter to the one on the left of your mock up frame and start from there. You are supposed to leave a baton width all around your frame. Also if you have some scrap timber screw it across the rafters above your frame, helps to keep the rafters in place when you cut through them.
    not necessary at the bottom because the purlin will do that.
     
  7. noseall

    noseall

    Joined:
    2 Feb 2006
    Messages:
    39,126
    Thanks Received:
    2,481
    Location:
    Staffordshire
    Country:
    United Kingdom
    ..or at the top (second image).:whistle:
     
  8. DIYnot Local

    DIYnot Local

    Joined:
    3 Sep 2019
    Country:
    United Kingdom

    If you need to find a tradesperson to get your job done, please try our local search below, or if you are doing it yourself you can find suppliers local to you.

    Select the supplier or trade you require, enter your location to begin your search.


    Are you a trade or supplier? You can create your listing free at DIYnot Local

     
  9. Sponsored Links
Loading...

Share This Page