Roofing contractors know what a magnet roofs can be for the random debris of society — and it often gets to ferment for several months before anyone notices.
There is growing awareness in the AEC industry of the destructive problems of moisture and air leakage through the building envelope. Building codes have caught up to the findings of building scientists and now require continuous air barriers across the envelope, including at penetrations and openings such as at windows, curtain walls, and doors.
Understanding the “Leak Triangle” and utilizing the 3-D approach—deflect, drain and dry—will enable the design/construction team to be more effective in analyzing problems and recommending solutions.
Section 1503.2 Flashing: Flashing shall be installed in such a manner so as to prevent moisture entering the wall and roof through joints in copings, through moisture-permeable materials and at intersections with parapet walls and other penetrations through the roof plane.
Waterproofing concrete is essential at below-grade areas to prevent water intrusion and structural damage. In many areas of the world we have exhausted the building sites having the good