![]() At Andrews Roofing, we address each of these components equally when consulting with clients and assessing roofing needs. ![]() On the other hand lower slopes that are “walkable” and shingled, but still have a slope that falls within the shingle manufacturer’s specifications for shingle installation, can present greater challenges with wind-driven rain getting under the shingles, debris accumulation, needing additional barriers for protection such as ice & water shield, etc.Īny solid roofing solution – whether it’s for a home or commercial building – should balance all five of these components. Mansard shingled roofs, for example, sometimes have nails tear through the shingles as they age. Obviously steeper slopes are more difficult to access and for shingled steep roofs, they will have a harder time fighting gravity over time. For truly flat roofs, special design considerations need to be made, and options like stepped slope insulation may be a safer bet.Įither roof can have its challenges. For low slope roofs with any sort of incline, gutters, internal drains and downspouts can be effective. Drainage for a low slope roof is critical since the basic design of it does not shed water the way a steep slope roof does.Flashing does not differ much from a steep slope installation and serves the same purpose to prevent water seepage at vulnerable spots.Roof structures of a low slope roof are conceptually the same – rafters, trusses and joists that support the sheathing, but the materials here may differ as well and could be steel, wood, or concrete.There are some structures with basic wood boards like a residential structure, but you may also see metal, concrete, gypsum, tectum and other fibrous materials. Sheathing for low slope roofs can differ quite a bit from steep slopes.All materials require an underlayment between them and the roof sheathing. Other material options include spray foam or metal. It is also common to see what are called “built up systems” which are composed of multiple layers of sheet materials and asphalt, often covered with a gravel coating. Roof covering for low slope roofs often consist of a single-ply membrane such as TPO, E.P.D.M., Modified Bitumen, or PVC.They also consist of the same five basic elements, but the details differ somewhat. Drainage has to be considered when designing the layout, shape and slope of any roof structure.įor all intents and purposes, a “ low slope” roof is usually flat, but technically it refers to any roof that is between 0% and 24% sloped. It ensures that water is shed from the roof in a way that doesn’t compromise the structure at any point. Drainage is a critical component of the overall roof design.They function to prevent water seepage at these vulnerable spots. Flashing is usually sheet metal that is installed at any point on a roof where there are joints, valleys, vents or chimneys.This is the framing of the roofline which is a part of the skeleton of the house. ![]()
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