I was hoping for a bit of advice on my first major bit of DIY - building some decking over my existing paved patio round the back of my house.
The patio is full width of the house (4.7m) and sticks out 2.5m.
I was going to sit the joists directly onto the patio with 150mm joists.
As there is a drain at the wall and the opposite side runs on to my lower level lawn, should I be concerned about the joists being sat on a damp patio, considering I've never seen puddling on there?
My other option is sitting smaller joists on top of some old 40mm edging stones, but i need at least 120mm under the boards to clear a concrete step at the back door.
Am I overthinking this small area of decking?