Hire the best Home Extension Experts

Zincalume roof, battens and valley

Results 1 to 8 of 8
  1. #1
    Senior Member
    Join Date
    Nov 2004
    Location
    Melbourne, Croydon
    Posts
    350

    Default Zincalume roof, battens and valley

    G'day all,
    I am replacing my old cement tiled roof with zincalume, and using 40mm zinc battens, the question I have when it comes to the valleys, should I put in timber valley boards, or can I use the zinc battens to support the valley.
    The problem with the timber is it is not 40mm and I would need to pack it up or similiar, but using the zinc the height is spot on, of course. Am I on the right track here?
    Thanks in advance.

  2. #2
    1K Club Member journeyman Mick's Avatar
    Join Date
    May 2003
    Location
    Kuranda, paradise, North Qld
    Age
    60
    Posts
    1,782

    Default

    The valley boards need to be lower than the roof battens, otherwise there's nowhere for the actual valley to sit. Depending on the pitch of your roof, the length of the valley and the rainfall intensity in your area you may need the entire 40mm difference available to you to get a gutter that will carry enough to avoid overflow and leak issues.
    I'd be looking at sheathing the entire valley area in 15mm ply and sitting the valley gutter on it. This will give you a valley gutter 25mm high. Any thinner and the ply won't be able to carry the weight of a full valley.

    Mick
    "If you need a machine today and don't buy it,

    tomorrow you will have paid for it and not have it."

    - Henry Ford 1938

  3. #3
    Senior Member
    Join Date
    Nov 2004
    Location
    Melbourne, Croydon
    Posts
    350

    Default

    Thanks Mick for the response, the roof is 30 degrees, valley lenth approx 4m, location Melbourne East.
    Now I don't intend on doing all this myself, just estimating costs and planning etc, so I know whay I am talking about for ordering and speaking to chippy, another question you may not be able to answer but I will ask anyhow, batten spacing, is it around 900, on timber trusses, N2 weather category.

  4. #4
    1K Club Member journeyman Mick's Avatar
    Join Date
    May 2003
    Location
    Kuranda, paradise, North Qld
    Age
    60
    Posts
    1,782

    Default

    No idea what the N2 category is, but 900 spacing for batttens is fine.

    Mick
    "If you need a machine today and don't buy it,

    tomorrow you will have paid for it and not have it."

    - Henry Ford 1938

  5. #5
    2K Club Member barney118's Avatar
    Join Date
    Jan 2008
    Location
    NSW
    Age
    50
    Posts
    2,369

    Default dont do it!

    Leeton,

    I have just finished a 180m2 reroof and I was hell bent on using topspan 40's because of the straightness and lengths of the steel. But the downside is installing insulation blanket and I changed my plan and used wood battens. WHY??

    to get the isulation stretched firm before sheeting, its quite easy using foil clips into wood, I believe you have to use magnets for the topspans and they are exy.

    I found the cost of the wood battens was not much different to the steel and when you install to the rafters make sure you OFFSET the screws to rafters. Hence the roof screws will end up centre of battens, so the the battens tie down are on the edges (alternate on rafters) to allow a straight run for the roofing.


  6. #6
    Senior Member
    Join Date
    Feb 2008
    Location
    nsw
    Posts
    118

    Default

    i use 100 x 25 oregon for valley boards

  7. #7
    Senior Member
    Join Date
    May 2007
    Location
    Darwin NT
    Posts
    116

    Default

    Mick,
    We have gone that little bit extra and pay more for a 2mm or more thick valley gutter with no boards at all. A bit dearer but deeper, which is what it is all about eh!

    Cheers
    Bill.

  8. #8
    1K Club Member journeyman Mick's Avatar
    Join Date
    May 2003
    Location
    Kuranda, paradise, North Qld
    Age
    60
    Posts
    1,782

    Default

    Quote Originally Posted by billbeee View Post
    Mick,
    We have gone that little bit extra and pay more for a 2mm or more thick valley gutter with no boards at all. A bit dearer but deeper, which is what it is all about eh!

    Cheers
    Bill.
    Good thinking, would mentally file it away for future reference, but not planning on doing any more building unless it's for myself.

    Mick
    "If you need a machine today and don't buy it,

    tomorrow you will have paid for it and not have it."

    - Henry Ford 1938

Similar Threads

  1. Roof Battens for metal roof
    By Huck in forum Roofing
    Replies: 2
    Last Post: 23rd Feb 2008, 06:25 PM
  2. Replies: 7
    Last Post: 30th Aug 2007, 08:42 AM
  3. Roof sheets secured in the valley
    By spartan in forum Roofing
    Replies: 19
    Last Post: 18th Feb 2007, 12:23 AM
  4. Rafters and battens to deck roof?
    By DEVLPA in forum Roofing
    Replies: 4
    Last Post: 17th Nov 2006, 03:00 PM
  5. Roof Tiling Battens
    By OBBob in forum Roofing
    Replies: 1
    Last Post: 12th Sep 2006, 12:06 PM

Posting Permissions

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