How to fix a tight installation

[wamund]

My flat garage roof is covered with rubber membrane (and gravel on top). I am about to make a new opening/passage in the roof about 150mm in diameter and naturally want to make it watertight. It is a concrete pillar that will go through the roof. I have a roll (several meters x 30cm) of rubber membrane left by the previous homeowner. See image!
My thought is to use this for the task if needed.
How do you join rubber membrane of this type? Vulcanize, glue, weld? Can it be done yourself? The material is about 1mm thick and elastic...

 

[Peter2400]

My flat garage roof is covered with a rubber membrane (and topped with gravel). I am about to make a new opening/penetration in the roof of approximately 150mm in diameter and naturally wish to make it watertight. It's a concrete pillar that will go through the roof. I have a roll (a few meters x 30cm) of rubber membrane left from the previous homeowners. See picture! My thought is to use this if necessary during the procedure. How does one join rubber membrane of this type? Vulcanization, glue, welding? Is it possible to do it myself? The material is about 1mm thick and elastic...

It's probably fairly certain to be EPDM membrane, which can be glued in various ways, https://www.boanas.se/dammduk/lim-och-lagningssatser-dammduk.html

 

[wamund]

Thank you! They seem to have suitable glue. Brilliant!