R-Value
A term used to describe the thermal resistance of insulation, see THERMAL resistance. |
Racking
A method of asphalt shingle installation where courses are aplied vertically up the roof. This is not a recommended installation method. |
Rafter
A structural component installed from ridge (high point) to eave, designed to support the roof deck, roof system and live loads. |
Rake
The sloped edge of a roof, directional of rafter. |
Rake Starter
Bleeder Strip - Starter Strip. Used along the rake edges in an asphalt shingle installation. |
Re-cover
Installation of new roofing materials over existing roof system. |
Reflectivity
The ability of a roofing material to reflect light instead of absorbing and the heat. |
Release Tape / Strip
Plastic or paper film or strip applied to self sealing shingles to prevent them from sticking toether in the packaging. This strip need NOT be removed during installation. |
Ridge
Highest point of the roof, where two slopes come together. |
Ridge Cap
The roofing material specifically purposed / manufactured for installation on the ridge. |
Ridge Vent
Contiuous ventilation along the ridge of the roof utilizing specifically manufactured vent components. |
Roof Cement
See asphalt roof cement. |
Roof Covering
The outer most exterior layer of roof assembly. |
Roof Jack
A bracket used to support toe boards on sloped roofs, these are for saftey and convenience during roof installation. |
Roof Slope (pitch)
The rate of vertical rise to horizontal length. 4:12 = four inch vertical rise per 12 inch horizontal lentch |
Roof System
All components included in the installation of a roof. |
Rubber
Quite possibly the most mis-used term when referring to low slope or flat roof materials. |
Run
The horizontal dimension of a roof slope.
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Saddle
See Cricket
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Saturated Felt
A felt material that has been immersed in hot asphalt (bitumen). The materail remains porous, used as underlayment for various roof systems. |
SBS
Styrene Butadien Styrene. |
Scrim
A woven or nonwoven fabric of continuous strands of material. This is used as a reinforcement for strengthening membranes. |
Scupper
A secondary (back up) drainaige device, through a wall or parapet wall. |
Self Adhering Membrane
A roofing membrane manufactured to self adhere to the substrate and underlying material by removal of a film or paper. |
Shingle
A small unit designed for installation with like units, overlapping rows, for installation on slopedroofs. Typically steeper sloped than 3:12. Ther term "Shingle" also refers to the act of installing shingles |
Shrinkage
A decrease in one or more dimensions of an object or material. In regards to roofing, some materials will, over time, shrink, and begin pulling away from parapet walls / perimeters. |
Single Ply Membrane
Roofing Membranes that are field applied using just one layer of single ply. Often thermoset or thermoplastic. |
Skirt Flashing
Metal counterflashing used under a mechanical unit, or skylight. Used to cover an protect the upper edege of a base flashing enad it's fasteners. |
Slate
A hard brittle rock consisting mainly of clay minerals. Used on steep sloped roofs. |
Slip Sheet
A sheet material (kraft paper, plyester scrim, polyethylene etc) placed betweent to components of a roof system. It's purpose is to ensure no adhesion occures between them and to protect one or more component. |
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