CANADIAN SHEET STEEL BUILDING INSTITUTE'S BLOG - New articles are now posted on the CSSBI website at www.cssbi.ca/blog
Tuesday, 23 December 2014
Thursday, 18 December 2014
Toiture en acier - plusieurs styles
Une tôle d’acier profilée est fixée à la structure portante à l’aide de vis à travers les nervures de la tôle. Les têtes de vis peuvent être peintes de la même couleur que la tôle. Les panneaux sont habituellement d’une largeur de 30 pouces ou plus et leur longueur peut être spécifiée selon l’application. Ce type de système de toiture en acier est très populaire pour de nombreuses applications au Canada.
Profilés à motif en tuiles
Panneaux d’acier prépeints profilés pour ressembler aux tuiles d’argile ou de béton souvent utilisées dans les constructions résidentielles. Le grand choix de largeurs et de longueurs élimine les nombreux joints que requièrent les toitures en tuiles d’argile ou de béton. De plus, leur poids plus léger permet de préserver la structure du toit. De nombreuses textures et couleurs sont offertes.
Ce type de toiture se caractérise par son motif d’ombres linéaires. Une grande variété d’espacements et de modèles de nervures et de joints scellés est offerte. Ces joints peuvent être plats ou cachés, ou en lattis larges. Les design et les systèmes d’ancrage varient d’un fabricant à l’autre. La hauteur et la largeur des joints scellés, de même que leurs couleurs sont très variées, permettant ainsi de satisfaire tous les goûts.
Les bardeaux d’acier ont été conçus comme alternative aux bardeaux d’asphalte communs, mais avec la résistance et la longévité des panneaux de toiture en acier. Les bardeaux d’acier sont plus légers que les bardeaux de toiture en asphalte, en cèdre et en ardoise et que les tuiles de béton et d’argile. Ils ne pourrissent pas, ne gondolent pas, ne se fendillent pas, ne se déchirent pas, ne s’écorchent pas, ne pèlent pas et ne se perforent pas dans des conditions d’usure normales et avec un minimum d’entretien.
Wednesday, 17 December 2014
The Many Styles of Residential Steel Roofing
There are several styles and colours of vertical rib, standing seam, steel shingle and tile profile that complement any style home. The only difficulty is deciding which one is best for your home!
A profiled steel sheet is fastened to the supporting structure with screws through the ribs of the sheet. These screws can have heads painted to match the colour of the sheet to blend in. Panel widths are typically about 30 inches wide or greater and can be supplied in custom lengths to fit the application. This type of steel roofing system is very popular in many applications all across Canada.
Pre-painted steel panels formed to create the appearance of clay or concrete tiles are often used in residential construction. The wide sheet widths and long lengths eliminate the many joints found in clay and concrete tile roofs. In addition, their reduced weight spells savings in the roof structure. There is a wide variety of colours and textures available.
Standing Seam Roofing
These designs are characterized by their linear shadow patterns. They vary greatly in the spacing and the design of the ribs or standing seams. These seams vary from flat, hidden seams to wide battens. There is a variety among manufacturers as to the design and the anchoring systems. The height and width of these standing ribs, as well as their colour will express a broad spectrum of aesthetic expressions.
Steel shingles are designed as an alternative to common asphalt shingles, but with toughness and long-lasting qualities of high-strength steel roofing panels. They are lighter than asphalt shingles, concrete and clay tiles, cedar shakes and slate roofing. Steel shingles will not rot, curl, crack, break, chip, peel or perforate under normal use and minimal maintenance. There is a wide variety of colours and textures available.
If you are looking for more information about residential steel roofing, please visit our website dedicated to the topic. www.steelroofsource.com
Tuesday, 9 December 2014
Sheet Steel Gauges - What They Mean
Within the construction industry there is often confusion over gauges, gauge numbers and the related thickness. The industry has been trying to move away from gauge numbers, without complete success. The following information will show why sheet steel products should be specified to the decimal thickness.
Manufacturers’ Standard Gauge For Steel Sheets
The most common gauge system used in Canada for structural sheet steel products is the Manufacturers’ Standard Gauge (MSG). The MSG for steel sheets was developed having a DEFINITE THICKNESS equivalent for each gauge number. In the standard gauge system the density of steel is taken as 489.6 lbs/ft3, or 40.80 lbs/ft2/in. However, since sheet weights are calculated on the basis of specified width and length, with all shearing on the over side, and also since sheets are somewhat thicker at the centre than they are at the edges, a further adjustment was made to obtain a closer approximation for inter-changeability between weight and thickness. Over a long period of time this value for sheets has been found to be close to 2.5 per cent heavier than 40.80 lb/ft2/in. A figure of 41.820 lb/ft2/in is the one commonly used to express the relationship between weight and thickness for steel sheet.
The Galvanized Sheet Gauge
The Galvanized Sheet Gauge is an older system used primarily by the trades consuming non-structural galvanized steel and is a measure of the zinc coated sheet thickness. It was developed in the early days of galvanizing before sophisticated wipers were available and, consequently, zinc thicknesses were thicker than today. The GSG system was used on some of the older gauge charts published years ago that unfortunately still seem to get used even today.
Thickness Definitions
There are a number of terms used for sheet steel products that need to be explained because they will affect the thickness of product that could be delivered to the job site.
Nominal Thickness: When sheet steel is produced by the steel companies it is manufactured to a target or “nominal” thickness. As with all manufacturing processes, variations in the final thickness of the sheet are unavoidable. However, the thickness is controlled very tightly to ensure that it does not fall below the minimum thickness (as described below).
Base Steel Thickness: The thickness of the sheet steel material without any coatings.
Coated Thickness: The thickness of the steel sheet including any metallic coatings (i.e. zinc or aluminum-zinc alloy) and paint coatings.
Design Thickness: The design thickness is the thickness of the base steel only, and is used by the engineer to determine the structural properties of the cold formed product. This is the thickness that a manufacturer will list in their product catalogues and load tables.
Minimum Thickness: The minimum thickness of structural sheet steel building products delivered to the job site will be the design thickness minus the maximum allowable under-tolerance specified by the CSA-S136 Standard or the material specification, whichever is the more restrictive. The minimum thickness allowed by the CSA-S136 Standard is 95% of the design thickness.
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