Green Building Bible, Fourth Edition |
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These two books are the perfect starting place to help you get to grips with one of the most vitally important aspects of our society - our homes and living environment. PLEASE NOTE: A download link for Volume 1 will be sent to you by email and Volume 2 will be sent to you by post as a book. |
Vanilla 1.0.3 is a product of Lussumo. More Information: Documentation, Community Support.
Posted By: SprocketHe says this is better because it's all ventilated.
Posted By: gyrogearHowever, if the membrane is drum-tight across the tops of the counter-battens, said precipitation, and vapour permeating, condensing then running down the topside of the membrane will, in places, be intercepted by the tile battens, which will effectively be "sitting in wet".
The tile battens, being horizontal, will prevent or impede water runoff - that is presumably why the mfr says it must not be pulled tight under the battens - latter could ROT...
Posted By: mark_sBut then again if the membrane is sitting in contact with the osb will some moisture pass through the membrane ?
Posted By: mark_swill some moisture pass through the membrane
Posted By: SprocketIs this a significant issue? Should I just let it go?
Posted By: SprocketI did not expect to have to get this closely involved in the details of our roofing but I have no choice now.LOL If you don't the buggers will just do what they want, how they want - one of the most frustrating things about the building industry. It is almost a pathological desire to bodge things.
Posted By: fostertomI wd put ordinary breather felt flat and tight on the OSB, held down by the counterbattens+1
They have nailed it to the OSB with clout nails. Is that OK?.
Posted By: Doubting_Thomasbut the gutterer was equally uncertain. Worried that a flash of rain would just sheet straight off the roof and over the top of the gutter!
Posted By: Doubting_ThomasWorried that a flash of rain would just sheet straight off the roof and over the top of the gutter!
Posted By: Doubting_Thomaswe'll have a ~75mm gap (50mm counterbattens + 25mm tiling battens) between the slate surface and the gutter belowYou're eave-ventilating the airspace between breather and tiles underside? That's good - are you using something like http://www.glidevale.com/fascia-ventilators/p/3 RV250 (equiv to continuous 25mm vent opening) which is 35mm high, fixed to top edge of fascia board to support the tiles underside? Then bring the breather out under the RV250, supported on an eave tray ramped up through the counterbatten height (making sure it still falls outward).
Posted By: SprocketI presume they were expecting to fill these new holes with cement...
Posted By: Doubting_ThomasLots of details online suggesting I'm on the right track, but the gutterer was equally uncertain. Worried that a flash of rain would just sheet straight off the roof and over the top of the gutter!The advice I was given was to place a straight edge on the top of the final finish and position the gutter such that the outer edge touches the underside of the straight edge.