I have built a large shed with a flat(ish) roof (1 in 35 fall). I have EPDM membrane for the roof, but watching lots of videos, I saw recommendations not to lay EPDM in cooler weather as the creases will never drop out, and as my membrane has been stored for a good 6 months I expect the creases will be especially bad. So, after I boarded the roof in 18mm OSB3 I laid a new blue tarp over the top and fastened it to the rough fascias with battens and screws, with the intention of laying the rubber roof on the first dry, sunny week of next spring.
That was 2 weeks ago, today I poked my head in and noticed that the blue tarp isn't weather tight as there has clearly been water coming through from above. Clearly I can't leave it like this for 6 months or my OSB3 will be soaked through.
My ideas are:
1) Remove tarp and replace with some form of proper roof membrane, overlapped as per the instructions and held down with battens running up and down the fall of the roof. But what membrane would keep the water out? Genuine question, is roof membrane actually waterproof or do the tiles do that part of the roof system?
2) Remove tarp and replace with a heavier-duty tarp. I realise blue plastic tarp is the cheapest, nastiest sort. But what grade/colour of tarp would be adequate?
3) Remove tarp, put some heavy gauge plastic sheeting down, lay tarp over (as wind protection for the waterproof plastic sheeting) and refit battens.
What would you do? I really don't want a creased up EPDM roof so I am keen to hold off on the laying until spring.
Edited to add: I'm after a temporary covering idea that I can remove in spring, before fitting the EPDM with the relevant adhesives. Re-reading my OP that wasn't very clear!
That was 2 weeks ago, today I poked my head in and noticed that the blue tarp isn't weather tight as there has clearly been water coming through from above. Clearly I can't leave it like this for 6 months or my OSB3 will be soaked through.
My ideas are:
1) Remove tarp and replace with some form of proper roof membrane, overlapped as per the instructions and held down with battens running up and down the fall of the roof. But what membrane would keep the water out? Genuine question, is roof membrane actually waterproof or do the tiles do that part of the roof system?
2) Remove tarp and replace with a heavier-duty tarp. I realise blue plastic tarp is the cheapest, nastiest sort. But what grade/colour of tarp would be adequate?
3) Remove tarp, put some heavy gauge plastic sheeting down, lay tarp over (as wind protection for the waterproof plastic sheeting) and refit battens.
What would you do? I really don't want a creased up EPDM roof so I am keen to hold off on the laying until spring.
Edited to add: I'm after a temporary covering idea that I can remove in spring, before fitting the EPDM with the relevant adhesives. Re-reading my OP that wasn't very clear!
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