Liquid sealing

[Tohatsu]

I have a roof under my patio (I have storage space underneath) where I have corrugated plastic between the floor joists. The problem is that it's not watertight.

I'm now thinking of just painting over everything from above with some thicker compound that provides a flexible watertight layer. Does anyone have any tips?

Preferably something a bit transparent.

 

[Frerider]

There is tape that you can use half on the channel plastic and half folded up against the beam if you can access it from above.

 

[Tohatsu]

There is tape that you can use halfway on the channel plastic and halfway folded up against the beam if you can access it from above.

Without going into too much detail, I have tried most things. I have already lifted the decking above 3 times and need something better. I have already carefully sealed twice between the beam and channel plastic and have a drip edge on top of the beam.

 

[Frerider]

Without going into too much detail, I have tested most things. I have already taken up the decking above 3 times and something better is needed. I have already carefully sealed 2 times between the beam and the channel plastic and have a drip edge on top of the beam.

Sealing is not the right way, but rather a wider tape that covers the entire beam 45mm and goes down towards the channel plastic, maybe two strips are needed to cover depending on how far down the channel plastic lies.
Here's an example, there are plenty of different tapes.

https://www.proffsmagasinet.se/mask...025138-tatningstejp-svart-25-m-100-mm-3094071

 

[Tohatsu]

Anyone have tips on a liquid sealant that you can "paint on" the entire surface?

I don't believe in tape on a wet beam

 

[Matti_75]

Hydra rubber LM. It is for concrete so I don't know how it adheres to your plastic.

 

[Tohatsu]

Hydra rubber LM. It's for concrete so I'm not sure how it adheres to your plastic

Brown/black it seems to be... would have probably preferred something with a bit of light transmission