It’s time to make the cut across the ridge of the breather membrane… cassette roof construction ie; tiles, batten, counter batten, membrane, osb, 50mm air gap, rigid insulation, osb.
However it just doesn’t quite feel right after working so hard to protect the building and keep water out. I realise that I need airflow from the eaves and above the insulation to the top of the roof but with this design there isn’t a ridge beam so air can actually flow from eaves, over insulation upwards and back down to eaves on the other side… I’m wondering if this is sufficient to avoid the need to cut the membrane and help me sleep easy knowing that the roof is watertight…. I’m sure this is a can of worms but any advice welcome. Thank you
However it just doesn’t quite feel right after working so hard to protect the building and keep water out. I realise that I need airflow from the eaves and above the insulation to the top of the roof but with this design there isn’t a ridge beam so air can actually flow from eaves, over insulation upwards and back down to eaves on the other side… I’m wondering if this is sufficient to avoid the need to cut the membrane and help me sleep easy knowing that the roof is watertight…. I’m sure this is a can of worms but any advice welcome. Thank you
