At slopes of 6:12 or greater, a 7-inch (180 mm) minimum lap length is typically used, while at slopes less than 6:12 a 10-inch (255 mm) minimum lap length is used. Wood shakes and other shingles require a minimum lap length of 11 inches (280 mm). Flashing at Roof Penetrations Smith, Percy Guillemard Llewellyn. Notes on building construction. Part 1. London, Oxford and Cambridge: Rivingtons, 1875. Chapter 10, Plumbers work. Print.

Aluminum is a more preferred metal, because it’s lighter, has thermal conductivity properties, has a cheaper upfront cost, and is anti-corrosion. Aluminum is also used in buildings due to its high strength to weight ratio. The material also requires minimal maintenance and fewer other materials. This is because it’s a good radiator of heat and has an anodized finish. Furthermore, you can cut, fold, punch, and curve aluminum to the size and shape you need. This allows you to manipulate the material for architectural creations. Pros Produced in accordance with the Bio-based Technology patent, this coating features Swedish rapeseed oil in place of a substantial amount of the fossil oil typically used in coatings, making this custom metal roof flashing a more environmentally friendly option. With a traditional appearance, high colour retention and resistance to rusts, UV radiation, scratches and dirt build-up, Prelaq Mica coated custom made flashings are available in: Another great benefit of our custom metal roof flashing is that it is available in the full range of high-quality multi-layer coatings that you’ll find in our sheets. We can make custom made flashings in a fantastic choice of colours, so it’s a great opportunity to personalise your building with contrasting custom roof flashing, or to perfectly camouflage them with the rest of the roof for a seamless effect. So, you can forge aluminum to become just as strong as galvanized steel. But, in its natural form, it’s not as strong to begin with. – CorrosionOld-time New England Journal of the Society for the Preservation of New England Antiquities, volumes 52-55 1961.19.

PERM-A-BARRIER Aluminum Flashing can be used in cavity or vertical wall construction where extended UV exposure is required (up to 1 year). However,If you want to uncover the difference between galvanized steel and aluminum, you’ve come to the right place and we’ll be comparing the two metals head to head.

Use galvanized steel for construction work. This includes balconies, ladders, walkways, although you should avoid it for outdoor construction projects, as it’s one of the least corrosion-resistant metals. The drive for continual improvements in performance may result in product modifications. Your GCP representative will be able to provide up-to-date advice. Aluminum Flashing Application A drip is commonly used to guide water away from the opening and to prevent capillary action, the natural tendency of water to make its way into joints due to gravity. But the most significant difference is how the materials are made. Galvanized steel is created during a hot dipped process when carbon steel is dipped into zinc. But, aluminum is a pure metal that is found within the earth’s core. On the other hand, you can clean galvanized steel with a water-based emulsifier with a pH of 12 or lower. You can then rinse the metal with fresh water, and wipe clean with a soft cloth. – AestheticsExposed flashing is commonly made from aluminum, copper, galvanized steel, zinc, lead, or terne. Sheet metal flashings are the most durable, thus their use in external/exposed conditions. Common Flashing Locations Steel roof flashing: As the most widespread choice of material for flashings in the roofing industry, steel is a malleable material that adds to the aesthetics of a roof - especially when paired with Steel roof sheets, as well as having great corrosion-resistant properties when the steel has been galvanised. Ramsey, Charles (2000). Hoke John Ray, Jr. (ed.). Architectural Graphics Standards (10thed.). John Wiley & Sons, Inc. ISBN 0-471-34816-3. Flashing is critical at the heads of openings for windows and doors to prevent water penetration. It is also required at sills to prevent moisture from potentially entering the wall underneath. Ching, Francis D. K.; Cassandra Adams (2001). Building Construction Illustrated (3rded.). John Wiley @ Sons Inc. ISBN 0-471-35898-3.