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Air tightness rolls

  • 10-02-2022 8:44am
    Registered Users Posts: 4,034 ✭✭✭ Amprodude

    Can you apply layers of airtightness tape over an attic that has the rafters insulated with insulation boards and has osb over that?

    The attic is insulated and has osb attached to the rafters covering the insulation. Can airtightness tape be applied over the osb for a perfect seal is what I want to know really? Stop any drafts coming through?


  • Subscribers Posts: 37,683 ✭✭✭✭ sydthebeat

    how do you dress that around your eaves so that you have an air tight seal?

    air tight layers are pointless if it doesnt seal the whole envelope

  • Registered Users Posts: 4,034 ✭✭✭ Amprodude

    I wouldn't be sealing that, just the area where the insulation and osb meet the rafters and side joinings to the joists of attic floor.

  • Moderators, Home & Garden Moderators Posts: 10,110 Mod ✭✭✭✭ BryanF

    Air-tightness (also typically a vapour barrier) should be on the warm side of the insulation.