What are the Different Types of Roof Flashing?
Flashing is an important roof component that provides protection to your roof joints from water and weather damage. There are a few different varieties of flashing that can be used to address different problems or weak areas, so we’ve put together a run through of the different types of flashing available so you can make the best choice for your property.
Plastic: Plastic or PVC can be used for a strong, durable and waterproof flashing, but PVC cannot come into contact with asphalt, which may make it an unsuitable choice for some roofs.
Roofing felt: Felt should only really be used alongside another material for flashing as the felt will not offer full waterproof protection and is not as strong or durable as some of the other options listed here.
Rubber: Rubber is flammable, so can pose a serious fire risk. It is also worth noting that rubber can eventually weaken and tear, so it isn’t the most long-lasting option.
Galvanised steel: Steel is robust, durable and extremely long-lasting, which makes it a very economical purchase. It is also very low maintenance and rust-proof, so you can be confident your steel flashing can be left for prolonged periods of time without worry.
Aluminium: Aluminium is very malleable, so it can be bent to shape with very little force. This makes it a very popular option for those with oddly shaped roofs or roof features that need to be taken into account.
Copper: Copper flashings are generally only used when custom made to match with copper roofing.
Different types of flashing
Continuous flashing: As the name implies, continuous flashing is installed in one long piece to provide protection to the joint between a vertical wall and a sloped roof.
Drip edges: Often installed under roofing felt along the eaves of a roof to prevent water seeping under.
Step flashing: Shaped to fit the horizontal of a roof and the vertical of a fixture. These flashings are overlapped to prevent water getting behind.
Valley flashing: A W-shaped piece that is placed on top of the roofing felt in the areas where two valleys of a roof plane join.
Vent pipe flashing: A cone shaped fitting that is worked into the shingles to cover pipes.
Saddle flashing: Used to cover protruding beams or railing attachments.
Cap flashing: An L shaped structure that lies flat against the roof and other fittings such as windows. The shape of the structure runs water off in the opposite direction and prevents it from pooling in any cracks around the fitting.
Examples of flashing in use
Chimney flashing: Flashings need to be applied around chimneys to prevent water pooling in the gaps between the roof and the chimney bricks. Metal or PVC is normally used, and is applied in different sections. Continuous flashing is placed across the bottom of the chimney, while step flashing is used to cover the sides. Cap flashing is often caulked in to lap over the other flashings to prevent water running behind them.
Skylights: Often skylights have a built in flashing to protect water from seeping in, but you can add your own additional flashing too. Continuous flashing would be fitted along the base of the window, step flashing up the sides, and then saddle flashing would protect the top of the window.
Corrivo Building Products have been supplying high quality and well constructed bespoke metal components for the industrial roofing industry since 2000. We create fantastic roof flashings in steel, aluminium, curved or corrugated styles, perfect to seal the perimeter of any premises. Get in contact today for more information on any of our services, we’ll be happy to help in any way we can.
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