New Roof Advise

Discussion in 'Builders' Talk' started by r10ley, Dec 7, 2017.

  1. Jord86

    Jord86 Screwfix Select


    It would help if you could post as best you can detailed pictures of the inside of your loft room and the appearance outside.
     
  2. r10ley

    r10ley New Member

    Will do thanks
     
  3. yorkshireboy

    yorkshireboy Member

    3/4 inch laths are totally adequate for a slate roof,there is no need to upgrade them and disturb your roof Windows.If you are replacing front and back roofs use all the sound original ones on the front and the Spanish ones on the back.
     
    KIAB likes this.
  4. koolpc

    koolpc Screwfix Select

    Breathable membrane is a must too
     
  5. r10ley

    r10ley New Member

    So from what I gather is tapering a 1 inch lath down to 3/4 inch to suit my current veluxs which were fitted around my current laths of 3/4 inch is not a problem. : ???
     
  6. BMC2000

    BMC2000 Active Member

    Did you insulate the roof when you did the loft conversion?
     
  7. r10ley

    r10ley New Member

    Yes all the work was done to regs the issue now is with wanting a new roof apparently to accomodate spanish slate it’s regulation to use 1 inch laths which is a problem as my current old laths are 3/4 inch.
     
  8. BMC2000

    BMC2000 Active Member

    You may have a condensation issue rather than leaks if you fired a load of insulation in the roof construction and didn't add a VCL or breathable felt. If your roof was watertight and now all of a sudden "leaking everywhere" that would be my strong suspicion.

    Has anyone got up and identified where the water is getting in?

    It would take a load of your Welsh slates to be cracked or missing, lead in bad order to get all over water ingress.
     
    KIAB likes this.
  9. yorkshireboy

    yorkshireboy Member

    I'm not aware of any regulation to use 1 inch laths,what about where you join into your neighbours slate laths.Your rafters on a house that age will probably be around 400 centres,a new build with trusses could have 600 centres,this is where bigger laths are needed,not in your case.If you have condensation it will appear in cold dry weather,not only when it rains.
     
  10. KIAB

    KIAB Super Member

    St Asaph Cathedral,Wales,it's slate roof had been there nearly 400 years & was still ok, so plenty of life still in your slates.

    A lot to be said for counter battening your roof, will allow ventilation & prevent the condensation issues.
     
  11. r10ley

    r10ley New Member

    Sorry but could you clarify what counter battening means? Thanks
     
  12. KIAB

    KIAB Super Member

    This shows counter battening better than I can explain it, as you can see in photo, you have a ventilation gap to allow air flow,allow moisture to escape.

    upload_2017-12-8_14-12-28.png
     
  13. They have been doing it that way up in Scotland for decades,there would also be a sarking board under the felt/membrane.
     
    KIAB likes this.
  14. KIAB

    KIAB Super Member

    Some 3/4" sarking, the proper way for slate,a uniquely scottish pratice, seems to be sadly out of fashion some parts of England, seen a slate roof being done other month, no sarking just a breathable membrane, then slates.:(
     
  15. r10ley

    r10ley New Member

    What’s sarking?
     
  16. KIAB

    KIAB Super Member

    Last edited: Dec 8, 2017
  17. fostyrob

    fostyrob Screwfix Select

    What is the benefit of fixing lathes to sarking?
    We have sarking followed by membrane on our new roof (horsehair on the old bits) and the slates nailed directly into the sarking. Does make it fairly hazardous when in the loft as you have to dodge the slate nails when close to the roof which I guess would be less of an issue if nails go into the lathes.
     

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