immihunk, not sure what you mean by "strong enough to guarded". Are you looking to do a roof top garden? What is your objection to wood decking? It is strong, lightweight and will make a fine deck surface that allows drainage. We've don a few with removable panel systems for cleaning and maintenance. I'll monitor this discussion and maybe you can fill me in?

Sounds to me like you might need an architect. DIY design sounds like a bad idea in this case. If I was an owner I would want a pro involved.

Your terrazzo flooring is one of the most durable floors but they need to be cleaned and sealed with a clear penetrating sealer to enhance their appearance and to prevent wear and tear. This is a hairline crack, simply sand the area with 80 grit paper, fill the crack with white portland cement, let dry, sand again with 200 grit paper, once satisfied apply concrete sealer.

Is there a garage building forum on this site? I plan to build a garage on a slope and need some help with the design, mainly creating a concrete slab on a slope. Thanks, Dan