Regarding Francois's roof, I never had a response from Adam or Lisa to my requests for professional expertise from 3Sixty. Alex's response was throw-away. As a result I have requested an estimate from PMP. Here is my email:
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That's great to hear. Thank you Richard.
We have a few roofs which are corrugated zinc, fixed down with bolts. Although such a roof ought to be of high quality with a long life, every few years we suffer leaks, and a roofer goes and puts aquapol somewhere. We never get a clear, unambiguous, authoritative report of what caused the leak, and - quite reasonably - we never get a warranty, but instead are warned that the repair will last only a few years.
There are various explanations for these leaks - loose bolts, degraded bolt seals, too-small holes through the zinc not leaving enough expansion space, blocked drains, ponding gullies, leaking seams.
If the bolts and their seals are at fault, then I'm surprised that there are not some wind-proof plastic caps to fit over the bolt heads to provide at least a little shelter from rain. I believe such caps are available.
Our roofer has told us that the long-term solution is to replace the bolts. Not the seals, but the bolts, which surprises me. With larger bolts. Before embarking on such a project, we would want a professional to analyse the situation and endorse such a solution.
In January/February/March we are having major works on this roof (new access hatches, man-safe cables, new smoke vents) and we plan to have this zinc roof's weathertightness analysed at this time because scaffolding will be in place.
We would ask PMP please to analyse the situation, identify the manner of the existing faults, and propose a plan for the long-term (20+ years) repair of the roof, including recommendations for materials. We would ask for a meeting to discuss and query your findings, and for your findings to be recorded in a simple report. We have had situations where surveyors have produced overly-long overly-verbose reports using your profession's jargon, which we as laymen cannot understand, and padded out with disclaimers. We would prefer please not to receive such a report from PMP.
The roofs are about 40m x 200m and can be viewed here on Google Satellite View:
https://maps.app.goo.gl/ZaARULaeniV9pbFK9
Here is a drone video of the roof:
https://drive.google.com/drive/folders/1JunF96m6FwOpcyGjcVNoH0-ROMjb9J2p?usp=sharing
Following on from this analysis and planning and our subsequent decision on a solution, we would possibly also be looking for a surveyor to - if not "project manage" our roofer - then at least to oversee and provide guidance to the roofer.
Please do not provide a quote, but rather an indicative price. I am not a building professional, and I suspect that you would want a more objective specification of requirements before quoting?
Regards, Mark Brough.