Snow Guard
A series of devices attached to a roof in a pattern used to prevent snow sliding from the roof in a sheet onto the ground. These are used on steep sloped roofs and metal roofs. |
Snow Load
The live load due to the weight of snow (see live load) |
Soffit
The undersurface of any exterior overhanging section of a roof eave. |
Soffit Vent
Intake vents installed unobstructed at the eave to facilitate circulation of air along the underside of decking to exhaust vents located at the ridge or near the ridge. |
SPF
Spray Polyurethate Foam, formed by spraying two components "A" and "B" that forms a fully adhered insulating membrane. |
SPF Compound
A term used to describe the raw materials used to make polyurethane foam (Isocynate and resin) |
Square
A unit of measurement used for roof areas. One square = 100 square feet. |
Standing Seam
A type of seam between adjacent sheets of metal material which are manipulated and then interlocked. |
Starter Course
The first course of roofing material, installed at the lower most edge. |
Steep Slope Roof
A roof with a pitch, or slope greater than 3:12 - 14 degrees
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Step Flashing
Individual pieces of sheet metal material used to flash around chimneys, dormers, walls. |
Strapping
A method of installing roof felts parallel with the slope of the roof. |
Surfacing
The top layer of a roof covering specifically in place to protect the underlying material from direct exposure to UV or weather (granules etc) |
Tar
A brown or black bituminous material liquid or semi solid in consistency. |
Tear Strength
the maximum force require to tear a roofing material |
Tensile Strength
The strenth of a material under tension as distinct from torsion, compression or shear. |
Thermal Expansion
The increase in the dimension or volume of a body due to temperature variations. |
Thermal Insulation
A material used to reduce the flow of heat. |
Thermoplastic
A material that softens when heated and hardens when cooled, used in roofing single ply membranes. |
Thermoplastic Olefin Membrane (TPO)
A blend of polypropylene and ethylene propylene plymers, flame retardants and other proprietary substanes for desired physical properties. TPO may or may not be reinforced. |
Tie In
The transition from one roof system to another type roof system. Typically where a steep sloped roof, terminates and joins with a low slope roof, the tie in is the junction between the two roofing materials. |
Tongue and Groove
One of the oldest types of wood used as roof decking. The sides are convex and concave, joining and aligning each other to form deck. |
Traffic Bearing
In roofing, a membrane or area of roofing system forumlated to withstand foot traffic. (Walk Tread for maintenance workers / HVAC) |
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