A flat roof is one that has a slope of 10 degrees and lower. All flat roofs are constructed with a slope to enable water to drain off. Abdu Wahab Nyanzi an architect says this kind of roofing is not ...

MEXICO CITY — Nearly two-thirds of the buildings that collapsed in Mexico City’s monstrous earthquake last month were built using a construction method that is now forbidden in seismic hotspots in the ...