Flat roof leak or condensation?

[old duffer]

its coming in

 

[old duffer]

The First Law of Engineering – “Water Runs Downhill”​

 

[John D v2.0]

pinholes even, in the Grp deck when installed

well for the benefit of future, it turns out you were exactly right. I scraped off some of the mushy osb from below (there's a thin hard crust on the bottom) and I can see clusters of pinholes though to outside in the GRP. Presumably that quadrant of the roof was not consolidated properly and it's been soaking into the OSB ever since.

 

[blup]

Glad that's resolved. You, or your builder should be able to do a localised repair i.e. overlaying with a strip of new grp glued/epoxied down.

Blup

 

[John D v2.0]

Glad that's resolved. You, or your builder should be able to do a localised repair i.e. overlaying with a strip of new grp glued/epoxied down.

Blup

Yeah I won't be going up purely for safety reasons, but the repair will be cutting out all the sodden OSB, laying fresh, and then as you mention laying/overlaying with another layer of flexible GRP. Waiting for a couple of quotes on that.

 

[John D v2.0]

Here are the photos. It was much more obvious by eye, for some reason the holes with daylight coming through don't really show up on the photos