Polycarbonate roof condensation between sheets

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Our utility room has a polycarbonate roof on it. It's a small extension on the side of the house built up to the boundary. So the brick acts as the fence/boundary Single skin brick, foam backed plasterboard and polycarbonate roof structure. It was already built when we moved in. I've noticed in winter and when it's bad rain and when I hose the roof down and clean it that condensation forms in between the sheets. Is this normal? It doesn't look as tho water is getting in it definitely looks like condensation to me. If its not normal is it an easy fix?
 

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havent got a clue
but suspect water has got inside and until it drains it will happen again and again
is there any exit at all at the bottom off the glazing for water or air to escape ??
 
Twin Wall polycarbonate often gets condensation inside if the ends haven’t been sealed.
 
The top I can't see properly because their is lead flashing over it. At the bottom their is a white plastic strip that covers it that can be pulled off. I think theirs tape behind that. It may need a clean. The only problem is I can't access the middle panels without going round to next door. Who we don't particularly get on with and who use that side to store loads of stuff. Can't see them letting me round and can't see them moving the stuff. I'm guessing I couldn't crawl on the very edge or is it too brittle?
 
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The condensation does no harm. Could it be the breather tape at the bottom needs a clean? I imagine it's full of muck
 
You need to re tape top and bottom of sheet with breather tape. Once old tape is off get a vacuum nozzle adaptor the thin type that you used to use to vac bits from the small gaps between car seats and vac all the water out the flutes, then clean and dry ends with solvent cleaner and put the new tape on. If there is a leak under the lead then the water will get through the tape so make sure all the leadwork is decent.
Gutters need to be clean and empty or the tape at the bottom will rot under the sheet closure.
 
I have no idea how I'm going to retape the top. I've no access onto the roof and it won't take my weight. Same with getting access to the lead. The bottom I can set a ladder up either side and stretch over. The top it's a lot more difficult. Especially to take the lead off all the way across. It isn't leaking in from the looks it looks like condensation. The bottom I'd have to get access from next door but we don't get on so may be a struggle. Like I said I can lean over at the bottom but no idea what to do across the top. The bottom trims that clip over the polycarbonate are full of muck and so is the breather tape. I will reapply breather tape. Could it be the tape is gunked up so its restricting air flow and causing condensation? Il try to get pictures of the top over weekend and il upload them and tag you @Mw Roofline
 
Try to do it on a hot sunny week and leave the tape off for a day or two so the moisture dries.
It may well steam up again but as said, it doesn’t stop it working
 
Here are photos of the outside and inside at the top. I see no access to the breather tape. The lead work looks OK. Surely if that was leaking it would leak inside the room itself down the wall where the lead is if water was getting behind?

So I guess take the bottom strips off and give it a clean and new tape. How do I span the roof so I can get access to the bottoms without going onto next doors land. I'm guessing none of the roof will take my weight
 

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