![]() ![]() Wind affects low-slope roof shingles through uplift and downward forces, leading to wind inflation, differential stress between the roofing components, and wind scouring (removing the aggregate surface of a roof). Thermal stress can also lead to cracking, blistering, and tenting of a roof system. Thermal splits lower wind resistance and cause leaks in a roof system. Thermal splitting puts stress and strain on seams and adhesions, causing thermal splits - a cut running down the entire shingle. Similarly, cold temperatures shrink shingles, increasing joint space. Thermal splitting occurs when warm temperatures expand shingles, decreasing the joints between the shingles. Extreme temperature fluctuations can wreak havoc on low-slope roofs, causing thermal splitting. Low-pitch roof shingles must withstand freeze-thaw cycles. To protect long-term durability and prevent leaks, you must ensure water removal from your roof's surface within 48 hours of accumulation. Pooling water can cause the roof's metal parts to rust, damage concrete components, and weaken wood features.Pooling water can easily make its way into weak points of the roof more than moving water.An aggregate roof surface can erode from the action of pool freezing and thawing.In warm weather, pooling degrades the roof's coating and membrane by intensifying the harmful UV rays, leading to photo-oxidation deterioration.Pooling degrades the integrity of your roof by encouraging the growth of damaging mold.Pooling adds weight to the roof, leading to possible roof collapse.Pooling can destroy the integrity of the roof system, leading to expensive repairs and early replacement. Water Pooling and Moisture ProblemsĪ low-slope roof without proper drainage will form water pools on the uneven flat spots or divots of the roof. The Codes also include requirements for roof decks, underlayment, flashing, structural performance, and materials and testing criteria, along with provisions for re-roofing existing buildings. Minimum and maximum roof slope guidelines vary based on the roof system and project types.Ĭhapter 15 of the International Building Code ( IBC) and Chapter 9 of the International Residential Code ( IRC) address roof coverings for low-slope applications and high-sloped roofs. Generally, all low-slope roofs, up to 4:12, require a double layer of No. Low-slope roofs have a slope between ¼:12 pitches to 4:12, requiring roofing techniques and material that ensure waterproofing, rather than water-shedding, as needed by moderate and steep sloped roofs. ![]() For example, 6:12 means that for every 12-horizontal feet, the roof changes 6-feet in vertical height. Typically, calculating pitch ratio indicates the rise in the roof over 12-horizontal feet. Roof pitch describes the angle, slope, or slant of your roof, indicated by a vertical (height) ratio versus the roof's horizontal (length) measurement. When evaluating your low-slope roofing options, you must also consider photo-oxidation, mold, freeze-thaw cycles, wind issues, and impact damage, all factors that can decimate the integrity of a low-slope roof.Ī low-pitch roof's long-term integrity depends on proper drainage and applying waterproof and durable roofing materials, like Brava synthetic roofing tiles.īeautiful Brava roofing tiles are the best roofing material for a durable, long-lasting low pitch roof - providing protection against water's damaging effects and resistance to ultraviolet (UV) rays, mold, thermal shifts, severe wind, and impacts from flying debris, foot traffic, and ice. Water pooling can damage and degrade the roofing material, causing leaks that will harm both the roof and the structure. High-pitch roofs allow water to easily roll off, however that’s not the case with low-pitch roofs. However, low-slope roofs pose one significant problem - water drainage that leads to pooling. They also reduce heating and cooling costs. Low-pitch roofs allow homeowners to utilize the space all the way to the top of the structures. In the mid-20th century, low-pitched roofs became the standard for many modern homes, replacing the Victorian-style homes' steep roofs.
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