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Why not render the walls and finish with a skim of plaster. This will give a thickness of 12mm and max 5mm.
You've really confirmed what I'd thougt. The buildings crap, and without drastic redesign and serious additional cost it's not easy to overcome the problem.
The idea of changing the roof is interesting, but I suspect will add an additional weight burden that we cannot accommodate.
Surely with a metal clad building the difficulty is the lack of mass, which makes it very sensitive to heat build up. Is there not also an issue with the fact that the cladding is relatively lightweight, even with around 200mm of mineral wool insulation. Can I add to this to reduce the problem.
There are a number of windows facing due south, which I will look at providing some shading to. The other thing that may be worth doing, I think, is to remove the ceiling at the upper level to give a greater volume of air, which I'll then look at get some cross ventilation into. I'll also speak to the clients about making an open plan office, rather than individual offices which should improve the cross flow of air.
The VAT website gives good guidance on this.
Do a search – Building and construction work and VAT28 August 2010 at 1:57 pm in reply to: Passivhaus principles applied to refurbishment: Pass-Net webinair #37362
As others before have commented, I found the videos very interesting. It would be nice to have some practical demonstrations/drawings of how some of the cold bridging was overcome.
It would be interesting to get some idea on costs to achieve this against current building regs standard. I realise that it is on a case by case basis, but as there are hundreds of thousands of terrace homes throughout the country, I wonder whether in fact the % increase is not significant.
Sorry, I'm getting old and forgot on monday.
The book is called “The control of damp in old buildings” published by SPAB
You can't really use research to put forward you argument, but you can and should use a comprehensive survey to establish the current condition of your building and the implications of cavity fill.
Guidance has been published (I'll try to remember and check on monday at work who it's by) on what you need to look at.
From experience with a company doing cavity wall insulation on my house, I would want a more professional job, taking a bit more time to explore the problems of the existing building.
The conservation officer is right to be cautious. Go back to them and ask them specifically what they require to be put in place to allow this to move forward. Hopefully they'll be amenable.
Thank you for the information.