Thought I'd add this to the blog but would be very grateful for some advice.
Some construction background:
MBC timber frame, flat roof, pumped insulation in roof void. Make up of roof is Sarnafil (hot welded) laid on a felt base, on top of 22mm OSB roof (with a slope), on top of 22mm OSB roof deck (flat - slope provided by battens to create the fall), then 400mm pumped insulation between the roof joists, air tight membrane, battens, 12mm plasterboard and skim.
Roof lights on the flat roof (including a lovely round one, subject of another blog post).
Yesterday we had some drips coming through the finished ceiling, about 700mm from the edge of our circular rooflight.
We cut away some plasterboard to see what is going on. Plasterboard soaking wet, batten soaking wet and looks like the insulation is soaking wet. There is some water damage closer to the rooflight too, visible in the photo, but we started our cut at the plasterboard edge which is where the water started seeping through - the low point I guess.
Have contacted roofing supplier and rooflight supplier (both of whom fitted their product).
What shall I do next? I can't help feeling that without detecting the source of the leak neither supplier is going to help us. Any thoughts? Cut away our ceiling until we find the edge of the problem? (as we get nearer to the rooflight bit of course we are 7m off the floor ☹️)