View the thread, titled "New Ofgem 5 day rule for customers to submit first kWh reading" which is posted in Solar PV Forum | Solar Panels Forum on Electricians Forums.
T
TonyL
Everyone starts somewhere and it is a joy to see a succesful small business. I am one !
I wish I could have used a local company, let alone a small one, but none of them impressed me. To a man, they wanted to drill 10mm fastenings into 35mm trusses without any additional woodwork. As an ex boat builder, or even just using some common sense, it was clear that this approach is utterly inadequate. The sheer stress points on the remaining 66% of the material either side of the fastening are ripe for failure and that's before you consider that the membrane integrity has been breached to make the join thus introducing the risk of rot.
Structural integrity calcs and Building Reg self certification is a horribly weak area in the whole process. I forsee many instalations are going to cause houses to fail surveys during a sale when the RICS surveyor goes into the roof and looks at a) how the panel load is transferred to the roof structure and b) whether ANY evidence of water ingress is present near the fastening points in years to come.
That comment applies very eqqually to large, medium, small nad one man band installers.
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Graeme Harrold
Its started to a certain extent with MCS accreditation calling for calcs now, so will hopefully stamp out the problem before too long, however those who have gained accreditation in the past 6 months or so who do not keep up to speed may still be installing substandard anchors for the frame....only time will tell.
I think you misunderstand the purpose of the membrane.
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TonyL
Perhaps I do misunderstand it's purpose. I think it's the barrier of last resort, after tiles have failed or been refitted around something.
Under the PV installs that I have seen, there are usually tiles missing - as opposed to carefully cut out to the create the absolute minimum required size hole. Or replaced over proper hooked anchor points which require no missing tiles. Or used under a lead flashing like every other item sticking through a roof
What is the acceptable standard?
Under the PV installs that I have seen, there are usually tiles missing - as opposed to carefully cut out to the create the absolute minimum required size hole. Or replaced over proper hooked anchor points which require no missing tiles. Or used under a lead flashing like every other item sticking through a roof
What is the acceptable standard?
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Graeme Harrold
In most cases the membrane is there to act as a barrier mostly for wind blowing under the slates, allow moisture run-off from household condensation and act as a runoff should water/snow blow under tiles. As for knocking holes in it, I think that is already done, after all, the slate battons are nailed to the joists through the membrane! A few more screw holes are not goint to make much difference to what is already a large swiss cheese. The newer fabric membranes work on water/heat pressure to allow moisture to escape, whilst holding out water droplets............I stand easy if I have it a bit wrong................
Reply to the thread, titled "New Ofgem 5 day rule for customers to submit first kWh reading" which is posted in Solar PV Forum | Solar Panels Forum on Electricians Forums.
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