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: davidfreeboroughthe heated envelope will increase by ((2 x Cos(roof_pitch))-1)x100%I don't see how that can be right. If the roof_pitch was zero (flat roof, cos = 1) then that'd be a 100% increase, if the pitch was 60° (cos = 0.5) then a 0% increase and for 80° (yes silly, but cos = 0.1736) a 65% decrease.
Posted By: davidfreeboroughput the insulation on top of the existing rafters & make it a true warm roofThink unbroken tea-cosy of insulation and airtightness - removes so many tricky problems and fail-points (despite best efforts) at a stroke, ensures best poss true performance out of the materials chosen.
Posted By: Nick Parsons''But will even lime render 'set' properly under those circs?''
To be honest, I don't have experience of applying it in damp conditions.Seeing it already on, and working, in damp conditions, yes.
But I do understand that hydraulic lime can achieve a set even underwater - hence its use in canal locks.
Posted By: fostertomEven hard cem render, concrete etc is good and vapour permeable - what it resists is liquid, so if it lets liquid in thro cracks it can't get out again as liquid, but it can, readily, as as vapour - however liquid is being added faster than it can dry by vapourisation. It seems that lime render's advantage is not so much that it's particularly vapour permeable, but that it hairlines all over so doesn't develop the fewer but wider v efficient liquid-pumping capillary cracks that hard cem render does.
Posted By: fostertomEven hard cem render, concrete etc is good and vapour permeable - what it resists is liquid, so if it lets liquid in thro cracks it can't get out again as liquid, but it can, readily, as as vapour - however liquid is being added faster than it can dry by vapourisation. It seems that lime render's advantage is not so much that it's particularly vapour permeable, but that it hairlines all over so doesn't develop the fewer but wider v efficient liquid-pumping capillary cracks that hard cem render does.we have a 14inch solid wall extension which was cement rendered outside and modern plaster inside. The plaster had damp patches all over it, particularly where there were cracks in the external render. We hacked the render and plaster off and 're-rendered and plastered in lime and the damp was cured. Oh and we used a breathable clay based pain inside.
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