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2. Flat roof - Wikipedia

   en.wikipedia.org/wiki/Flat_roof

   Thermoplastic polyolefin (TPO) single-ply roofing is the single most popular type of commercial low-slope roof covering as of 2016. [18] A TPO roof membrane consists of three layers: a TPO polymer base, a polyester reinforcement scrim middle layer, and a TPO polymer top ply, which are heat-fused at the factory.

3. List of roof shapes - Wikipedia

   en.wikipedia.org/wiki/List_of_roof_shapes

   Roof terrace (including roof garden) Single-pitched roof. Shed roof (lean-to, pent roof, [2] skirt roof, outshot, skillion, mono-roof [3]): A roof with one slope, historically attached to a taller wall. Saw-tooth: Multiple single-pitched roofs arrayed in a row, sometimes seen on factories. [4] Multi-pitched roof:

4. Membrane roofing - Wikipedia

   en.wikipedia.org/wiki/Membrane_roofing

   Membrane roofing is a type of roofing system for buildings, RV's, Ponds and in some cases tanks. It is used to create a watertight covering to protect the interior of a building. It is used to create a watertight covering to protect the interior of a building.

5. List of commercially available roofing materials - Wikipedia

   en.wikipedia.org/wiki/List_of_commercially...

   Roofing material is the outermost layer on the roof of a building, sometimes self-supporting, but generally supported by an underlying structure. A building's roofing material provides shelter from the natural elements. The outer layer of a roof shows great variation dependent upon availability of material, and the nature of the supporting ...

6. Ponding - Wikipedia

   en.wikipedia.org/wiki/Ponding

   Ponding water accelerates the deterioration of many materials, including seam adhesives in single-ply roof systems, steel equipment supports, and particularly roofing asphalt. On low-slope asphalt roofs, ponding water allows the oil solvent components of the asphalt to leach out and evaporate, leaving the roof membrane brittle and susceptible ...

7. Roof pitch - Wikipedia

   en.wikipedia.org/wiki/Roof_pitch

   In the imperial measurement systems, "pitch" is usually expressed with the rise first and run second (in the US, run is held to number 12; [1] e.g., 3:12, 4:12, 5:12). In metric systems either the angle in degrees or rise per unit of run, expressed as a '1 in _' slope (where a '1 in 1' equals 45°) is used.