Demolitions

The basic rule is that explosives for demolitions have the same statblock array as grenades. So while this is the base assumption, other munitions can also be used - probably with a higher DC to place and a lot more collateral damage.

Shopping needs (what to buy for specific needs) .

Hocking grenades: frags 1 and 2 are safe (as safe as a grenade gets). From there it can get more dangerous, especially around conventional infrastructure. Any surface with a CR is assumed to be industrial-strength, reinforced, or security construction; the CR is equal to whoever would show up to be sad at you if you started some shit.

Surfaces with no CR are "commoner" CR 1/2 stuff. A Frag 3 will wreck a sturdy common structure, a Frag 2 will wreck a normal common structure. 10 lbs of tier 1 (350 credits) will destroy a sturdy common, 3 lbs of tier 1 (105 credits) will destroy a normal common - so opening new doors in an apartment building isn't very expensive.

Ranged weapon fire also generates damage on par with grenades, but in a smaller area of effect. It's not going to be wrecking as much shit as throwing around explosives - but it's worth noting that, yes, after about level 12 your missed shots are very likely to destroy something in the background, and a few levels before that you can start opening conventional doors without keys.

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Raw data (units to destroy)