![]() ![]() The higher the value, the more resistant the material is to heat transfer. R value is a measure of a materials’ resistance to heat transfer. The same principal applies to roof scuppers and other drainage locations. A roof that has an insufficient number of internal drains can have more drains added. A roof with undersized gutters & downspouts can have larger gutters & downspouts installed. Pre-formed tapered insulation is commonly available in ⅛”, ¼” and ½” per foot slopes.Īre the scupper openings large enough to support water flow? Are there enough scupper openings? Are there saddles present between scuppers to eliminate ponding water?Īre the gutters large enough to handle water flow? Are the downspouts large enough to eliminate water quickly? Are there enough downspouts?ĭeficiencies in your roof drainage system can be easily corrected. For example, a roof that sheds water toward the front of a building could be modified to shed water toward the back of the building. Not only can existing roof slope be increased, but it is also possible to change slope direction completely. Most roof slope deficiencies can be easily corrected with the addition of tapered insulation. This will minimize the chance of stagnant water (ponding) on the roof surface and will minimize the chance of water damage when the roof begins to fail. While many older flat roofs have performed satisfactorily with slopes of barely ⅛” per foot, it is typically recommended that the roof slope be a minimum of ¼” per foot. Simply put, a roof should shed water not retain it (like a swimming pool). When this roof begins to develop leaks, the leaks will be much more severe than they would on a roof that is shedding water quicker and has minimal ponding water. The ponding water is caused by a roof slope that is inadequate to overcome irregularities in the roof surface. ![]() Imagine a roof that has very little slope and many areas of ponding water. The biggest problem with most commercial or flat roofing systems is caused by poor roof slope. The slope of your roof system plays an important role in how effectively your roof sheds water. ![]()
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