Low Slope Roof Pitch

Residential low slope roofing can generally be divided up into two broad categories.

Low slope roof pitch.

Flat roofs 0 to 2 in slope are flatter than low sloped roofs and pitch just enough to drain water. It s constructed of a durable reinforcing mat of non woven glass fibers that have been coated and permeated to a thickness of approximately 2 0 mm. It determines how many inches the roof should rise for every 12 inches expanding on the horizontal side. Self adhesive flashing membrane under the shingles prevents leakage on low slope roofs.

But the taller profiles like standing seam and pbr shown below can be installed on roofs with as low as 1 4 or 1 2 in 12 pitch. Before taking any measurements you must first confirm that it s safe to walk on your roof. Their fasteners are either concealed or screwed at the top of a ridge which makes them less likely to leak. No roof of course should actually be completely flat.

Then apply standard asphalt shingles over the membrane. Some people prefer high pitches and some other choose low roof pitches each has their own advantages and disadvantages. A roof has a low pitch if it slopes anywhere from 2 12 to 4 12 inches meaning that for every foot the roof extends horizontally the level of the roof rises two to four vertical inches. In our photo left the roof slopes less than 1 per foot notice that dark ponding area at the center of the photo.

Some roofs have extremely low slopes and appear to be nearly flat. Position your level against the roof until the bubble of the vial sits between two lines. 1 cover the entire surface with a self adhesive flashing membrane such as grace ice water shield there are many equivalent products. Larger flat roofed applications low slope such as residential condominium complexes row homes and town houses and smaller applications such as residential porch and garage transitions from the main home where the slope of the roof changes dramatically from steep slope to low slope on the same structure.

Low slope structural roofing generally used on roof pitches ranging from 12 to 3 12 consists of interlocking panels commonly called standing seam roofing that run vertically along the roof surface. Check the surface of the. Steep slope roofing systems are also known as residential roofing systems and in their classification they are roofs with a slope of 21 12 and higher. These panels generally come with a painted mill finish or a clear acrylic finish.

Take the measurement of the vertical. Low pitch roof systems and steep slope roof systems there are two types of roofing systems low slope roofing systems and steep slope roofing systems. Actually most flat roofs are not dead flat and in good design also include slope towards their drains. The membrane will outlast the shingles and seal around all nail penetrations.

Take a measurement of 12 inches using a level.