Is there a need to waterproof an exterior suspended concrete slab on top of steel framing? The architect is requesting a waterproofing membrane and 4" conc topping on top of 6" structural slab to protect structural steel framing below. I have not heard of this as an issue. It changes the design...
During a luminaire pole submittal review I noticed a fabricator had specified the material for a square HSS as ASTM A500 Gr. B. Rather than listing the yield strength as 46ksi, they indicated it as 55ksi on the drawing and used 55ksi as the yield strength in the calculations. I commented on the...
