I am building a wooden terrace based on frame made of pressure treated lumber (ground contact grade) placed on concrete blocks ("on-grade" footings). Something like this:
What I know is that I should prevent direct contact of wood and concrete (even if lumber is pressure treated) to stop moisture absorption.
What is the best solution for low budget project (also to not overdo it)? There is a roof over most of the terrace so I hope there won't be much moisture involved but I guess I want to insulate everything same way.
The options I am considering as separation layer and already having materials to are:
1. Bituminous paint layer only:
2. Roofing pap:
- Plastic strip: - not always possible as being thick and level of some of the footings do not leave space to raise the point up.
4. Any combination of above?
It looks like any option should do as lumber is ground-contact grade pressure treated and do not even touch the ground but want to add extra caution anyways (seems there is never enough protection against moisture). Please let me know if I am overdoing it or there are other methods or aspects (like chemical interaction, standing water) I should be aware of?