Hire the best Roofing Expert

Adjust Fall in Polycarbonate Roofing

Results 1 to 4 of 4
  1. #1
    Apprentice (new member)
    Join Date
    Aug 2019
    Location
    Sydney
    Posts
    11

    Default Adjust Fall in Polycarbonate Roofing

    Hi, my house has a carport with a polycarbonate roof and I have noticed that the fall seems insufficient as rain drips back over the front rather than running backwards towards the guttering - see attached. I have measured and the length of the carport is 3.6m and the drop is approx. 2.5cm so seems seems to be slightly less than the 5% recommended minimum. Does anyone have any recommendations for how I can increase the fall without having to change any of the existing timber? I was thinking some kind of washers/spacers underneath each of the front screws could help lift the front up or perhaps just add another small piece of timber on top of the front beam to raise it up slightly. Has anyone had experience with a similar problem before?
    Attached Thumbnails Attached Thumbnails img_9033-1-.jpg  

  2. #2
    Seasoned DIY droog's Avatar
    Join Date
    Sep 2005
    Location
    Bendigo
    Age
    57
    Posts
    2,429

    Default

    Quote Originally Posted by nebsta View Post
    Hi, my house has a carport with a polycarbonate roof and I have noticed that the fall seems insufficient as rain drips back over the front rather than running backwards towards the guttering - see attached. I have measured and the length of the carport is 3.6m and the drop is approx. 2.5cm so seems seems to be slightly less than the 5% recommended minimum. Does anyone have any recommendations for how I can increase the fall without having to change any of the existing timber? I was thinking some kind of washers/spacers underneath each of the front screws could help lift the front up or perhaps just add another small piece of timber on top of the front beam to raise it up slightly. Has anyone had experience with a similar problem before?

    Washers will not work, with the amount of fall over that distance your pitch is 0.4 degree
    https://www.blocklayer.com/riserun.aspx

    Are you sure it is 25mm drop over 3600mm ?

  3. #3
    7K Club Member
    Join Date
    Jun 2010
    Location
    Geelong
    Posts
    7,714

    Default

    for example, using 70x35 battens, this can be done... until it gets too tall... then you rip down larger members....

    creating-fall.png

  4. #4
    7K Club Member
    Join Date
    Jun 2010
    Location
    Geelong
    Posts
    7,714

    Default

    Or if you aren't getting leaks at the laps, add another gutter at the front

Similar Threads

  1. Polycarbonate roofing question
    By maachine in forum Roofing
    Replies: 7
    Last Post: 30th Dec 2016, 10:29 PM
  2. twin wall polycarbonate roofing
    By mic-d in forum Roofing
    Replies: 2
    Last Post: 28th Feb 2013, 08:05 PM
  3. colorbond Vs polycarbonate pergola roofing
    By ozzierog in forum Roofing
    Replies: 60
    Last Post: 25th Apr 2012, 10:59 AM
  4. Cutting Lasterlite / polycarbonate roofing
    By ndaki in forum Roofing
    Replies: 3
    Last Post: 19th Feb 2010, 08:09 PM
  5. Polycarbonate Roofing- What brands
    By Tas_Dean in forum Roofing
    Replies: 6
    Last Post: 12th Dec 2007, 11:16 AM

Posting Permissions

  • You may not post new threads
  • You may not post replies
  • You may not post attachments
  • You may not edit your posts
  •