Leaking flat roof… does this look right?

[DownSouth]

Our fibreglass roof is leaking on the garage. In the morning light you can clearly see the joints and if we walk on it it makes a crinkly cracking noise. Getting the team back this week but they won’t be able to fix it in this weather. Does anyone have similar? Can you see the joints in yours? One opinion is they skimped on resin… would welcome others thoughts

[DownSouth]

[Marvin]

Hi @DownSouth

 

Sorry to hear about the problem.

 

Would you please indicate where the water is coming through. Is it in any particular area? 

 

What you have is a sort of pond with drains at the bottom. 

 

It concerns me that the drains could become blocked with the leaves and the water rise above the sides of the fibreglass when there is torrential rain.

 

More info = better understanding = better advice   

[jack]

1 hour ago, DownSouth said:

Our fibreglass roof is leaking on the garage. In the morning light you can clearly see the joints and if we walk on it it makes a crinkly cracking noise. Getting the team back this week but they won’t be able to fix it in this weather. Does anyone have similar? Can you see the joints in yours? One opinion is they skimped on resin… would welcome others thoughts

 

A reinforcing band is usually laid along joints to reinforce them before resin is applied, which can result in a visible line (you can certainly see the joints in the fiberglass on our balconies, but that's probably because I did them!)

 

Crackling noises suggest a lack of adhesion, which could be down to insufficient resin, or the resin they did use not being rolled out enough to ensure full wetting of the glass through to the substrate. However, even if you don't have full adhesion, as long as the resin is continuous, it shouldn't leak.

 

Do you know where the leak is? Are there any obvious pinholes? What about the copings over the parapet walls? We had a leak through a section of aluminium coping over our parapet wall that was not at all obvious due to how far the water tracked before becoming visible.

 

More info needed, but @SteamyTea might have some thoughts.

[DownSouth]

The leak is on the left hand side of this picture. I’ll go up and take some close up photos this week. The ‘pond’ is under an oak tree so we’re up each week to clear the leaves at the moment. The water was 1-2cm deep, so not coming up the sides. 
Hadn't considered the parapet panels but will have a good look there too, thanks.