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Cost of Metac insualtion and airtight membrane

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Comments

  • #32
    hexosan
    Registered Users, Registered Users 2 Posts: 1,739 ✭✭✭hexosan


    Below taken from the recently published NSAI guidelines on retrofits

    http://www.standards.ie/cgi-bin/news/ie/NEW276


    6.3.3.3.5 Re-roofing and using a breather membrane Where roof coverings are being replaced the existing felt underlay can be replaced with a breathable roofi ng membrane instead of providing a 50 mm void for ventilation, in accordance with relevant certification. The membrane should be laid taut from ridge to eaves, or side to side. Generally breather membranes should have an additional set of counter battens fixed on top of the rafters, prior to fixing the new tiling battens to allow for drainage and ventilation. The type of breathable roofing membrane should be installed in accordance with the manufacturer’s instructions and any relevant certification and the void between the breather membrane created by the counter batten should be ventilated from eaves to ridge. It may then be possible to fill the majority of the depth of the rafters with insulation, as usually it is only necessary to leave a nominal space between the insulation and the breathable roofing felt.


  • #33
    hexosan
    Registered Users, Registered Users 2 Posts: 1,739 ✭✭✭hexosan


    Calahonda52 wrote: »
    OP, how does all this fit in with the Tegral eaves and ridge venting system?
    Whats the air path?
    Doe it not require counter battening?

    I have installed a ridge vent strip (supplied by tegral) which is rolled out underneath the ridge tiles before they're installed creating a continuous 5mm ventilation gap at the ridge.


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