Decking onto concrete slab

[CortinaV8]

I had intended to remove the patio at the rear of my house and install a small amount of decking in its place using the post method, however, when I removed the two patios laid on top of each other! I discovered the original concrete slab in good condition which makes building the deck a lot easier.

Anyhow, my question is does it need securing or not? I've read in places I could leave it floating and the weight will hold it in place, however I think I would rather have it secured down to the ground properly.

Would you secure it? and if so what kind of fixing would you use?

 

[WabbitPoo]

I always secure somewhere, to stop the whole thing moving laterally. If you can attach it to say, the house, then no need to attach it to the concrete too.

 

[wingcoax]

If you are putting the legs straight on the concrete then wrap the bottom end in a bit of roofing felt or put them on slate, this should stop any damp problems, although you should treat the ends anyway.