I live in Ontario, Canada. The humidity levels are pretty high all year round....up to 80% in Summer, and the temp. is often minus 30 celcius in Winter. I have a solid concrete porch (10' x 8 ' x 20" thick) with hollow block steps that the former owner installed himself which is an eyesore. He brought the concrete up to within 1" of the threshold of the entry door, which means we get snow piled up against the door in Winter. I have considered removing the porch entirely, but don't really want to break up this much concrete. An alternative would be to remove the hollow block steps, frame the porch on the three sides away from the house with wood and attach wooden steps. My question is this : which fasteners are best for attaching wood to concrete ? Would I need a vapour barrier to separate the wood from the concrete, and can anyone suggest a "cap" to prevent rain and snow from penetrating the gap between the wood and concrete ?

Thanks for reading and any help with this.