| Résumé : |
This article examines why aesthetics are important for buildings with steep roofs and new building code requirements.
In general, roofing and roofing materials are characterised as being 'low-slope' or 'steep-slope'. Low-slope is generally considered in the industry as a roof with a 'rise-over-run' of two feet in 12 ('2:12') or less. (Flat roofs are de facto considered to be in the 'low-slope' category). Steep-slope would be any roof with a rise-over-run relationship of greater than 2:12 (>10°). In general, steep-slope roofs are more common in residential applications, while low-slope roofs are more common in commercial applications, although this is certainly not a hard-and-fast rule.
Another significant difference between low-slope and steep-slope roofing has to do with aesthetic considerations. Generally, low-slope roofing cannot be seen from ground level, so the appearance of such roofing is not a major factor. Steep-slope roofing, however, is easily visible and 'look count'. As a result, manufacturers of steep-slope roofing products invest considerable resources addressing aesthetic issues.
Asphalt shingles are now commonly supplied with dimensional characteristics and variegated colour schemes. Painted metal roofing comes in thousands of different colours, shapes, sizes and textures. Concrete tile, clay tile, and cedar shake roofing are all designed with performance and aesthetic in mind. Because of the different requirements for steep-slope vs low-slope roofing i.e., steep-slope roofs are typically designed as water-shedding systems, low-slope roofs are designed to form a seal against water penetration - different materials are typically used in their composition and construction. |
Aller sur edunet
Accueil
Keeping roofs cool in POLYMERS PAINT COLOUR JOURNAL - PPCJ, Vol. 194, N° 4483 (12/2004)
