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Last weekend, after ignoring the grey area in the condo bylaws, I rented a proper hammer drill and made a valient effort. Chewed through more bits then concrete. I was able to get through some of the concrete, but hit rebar (or exceptionally solid agregate) and could go no further, even with a fresh bit. So I patched the drywall and did some touch up painting. I then decided that drilling was not an option.
Home Depot has numerous anchors that are designed to hold in 5/8 drywall-gypsum. I've had a pair of (small but heavy) speakers mounted in nothing but drywall for about a month now. I wouldn't trust old brittle 3/8 drywall to hold up a calander. However, nice new thick material must have some significant support strength.
I am still wondering how much I can safely hang. I haven't been able to get a solid figure out of google, let alone a first-hand account. It's great to get numerous responses, but redundant replies that ignore the question don't really help.
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