Laying decking on top of garage roof (concrete structure)

[Plupp 405730]

That's what I mean, it should be enough. Yes, I'm not sure about the slope since we haven't scraped the surface yet, but there should be some slope. The garage was cast in the 50s, and it's uncertain if it was done according to the rules. But I'll check tomorrow.

As long as it's a few cm, it's enough since Mapei's waterproofing is approved on a flat surface, but with a completely flat surface, there will be problems in the long run as debris will accumulate under the deck...

 

[ricebridge]

Thanks for the tips here as well. Have you attached the decking transversely to the concrete, or is it just held in place by weight?

It's loose, but there's a railing around, so it doesn't move sideways. Otherwise, I would have had to screw it down.

 

[Majaji44]

What was the solution?

I have a garage roof that does have a slope but has a wooden decking on top. Now it has started leaking into the garage. So I need to solve it somehow, new felt roof, Mapei's products, gummiduk?