Raising the low spot (supports, shims etc from the underside/interior) would prevent the water and snow melt from pooling. Water freezing repeatedly in a leak path is only gonna make it worse.
Slap some sealer or membrane on the affected area and luck is your uncle.
Amen to that. It'll more than pay for itself in cooling costs the first summer, And, it makes the rest of the materials last longer.
The temp ranges here in Chicago are pretty extreme and any leaks get big really fast. Looking up to see where the water is leaking followed by a trip to the roof is going to answer where your leaks are.
One problem with old buildings here is the amount of junk up on the roof. You can barely even walk around on some commerical buildings because of all the footings from removed HVAC units, signs, and all the plumbing and electrical junk related to that stuff.
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