METAL SIDING

Metal siding comes in a variety of metals, styles, and colours. It is most often associated with modern, industrial, and retro buildings. Utilitarian buildings often use corrugated galvanized steel sheet siding or cladding, which often has a coloured vinyl finish. Corrugated aluminium cladding is also common where a more durable finish is required, while also being lightweight for easy shaping and installing making it a popular metal siding choice.

Formerly, imitation wood clapboard was made of aluminium (aluminium siding). That role is typically played by vinyl siding today. Aluminium siding is ideal for homes in coastal areas (with lots of moisture and salt), since aluminium reacts with air to form aluminium oxide, an extremely hard coating that seals the aluminium surface from further degradation. In contrast, steel forms rust, which can weaken the structure of the material, and corrosion-resistant coatings for steel, such as zinc, sometimes fail around the edges as years pass. However, an advantage of steel siding can be its dent- resistance, which is excellent for regions with severe storms—especially if the area is prone to hail.

SPECS

Paint Qualifications Test 1 Film Thickness

1. The exposed surface shall have a dry film thickened of 22.5 μm ± 5 μm (0.9 ± 0.2 mils).
2. The unexposed or reverse side shall have a dry film thickness with will vary in accordance with the customer’s requirements.
3. Test Method: ASTM D1005 or CGSB 1-GP-71.NCCA II-18.

Film Cure

The baked film shall withstand 100 double MEK rubs in accordance with ASTM D5402.

Film Hardness (Pencil Method)

The hardness of the paint film may be measured by means of Eagle Berol pencils using a flat round head applied at a 45° angle to the paint film. A minimum hardness of HB shall have be obtained. Pencil Hardness is specified as the first pencil number that will not rupture the paint film when tested as described above. Test Method: ASTM D3363 or NCCA II-12.

Humidity Resistance

1. The humidity resistance test shall be conducted at 100 percent relative humidity at a temperature of 38°C (100°F).
2. After 1000 hours of exposure, the surface may show only a few scattered blisters no larger than No. 8 (per ASTM D714).

Formability / Adhesion Test

1. When using a representative sample at 20°C ± 1.5°C (70°F ± 5°F) using #600 Scotch cellophane tape, the paint system will show no lost of adhesion when bent 180° around a 3 mm (1/8 inch) diameter mandrel.
2. This requirement does not apply to material which as ordered as ASTM A653 Grade 80 or ASTM A653M Grade 550.

Test Method: ASTM D4145. 6 Gloss

The specular gloss shall be 25 ± 5 degrees when measured with a Gardner 60° Glossmeter. When other than the standard film build is ordered, the gloss range shall be mutually agreed upon prior to purchase. Test Method ASTM D523

Exterior Exposure (Weathering)

For each proven colour of proven durability in the 10000 Series, a production sample complying with the foregoing specification has been given exposure in Hamilton, Ontario, at 90° to the horizontal facing south and has either successfully met or will successfully meet the following weathering standards: .1 Film Integrity 1. During the first 30 years in normal roll-formed applications, and providing there is no evidence of compromise integrity due to fabrication, installation, or service, the paint film shall have shown no cracking, checking or loss of adhesion that is apparent in routine unaided visual observation.

Chalking

During the first 30 years, chalking shall not exceed #8 in the vertical installations and #6 in non-vertical installations when measured per ASTM D4214, Method D659.

Color Change

During the first 30 years of exterior exposure the colour change in vertical application shall not exceed 5 colour units, and in non vertical applications the colour change shall not exceed 8 colour units when measured per ASTM D2244. Color change is measured on any accepted colorimeter designed to produce reflectance readings in the Tristimulus Filter system so X, Y and Z based on the CIE values of illuminant C. (ASTM 3964; Hunter Lab Units)