Metal Flashing is among the most recommended of weatherproofing installations for a home’s roof. Metal flashing essentially refers to inserting sheets of metal at certain, strategic points to neutralize the entry of water or moisture. Metal roof flashing is usually installed towards the end of a roofing project or as a part of roofing repairs. Metal flashing prevents roof leakages and corrosion around the points where the roof meets other parts of the house like the chimney or the skylight. You need to be aware about the various metal flashing techniques and options.
Identify Weatherproofing Areas
It is critical that you identify the areas where the flashing has to be inserted. Flashing is the last roofing layer to be installed, over the felt and shingling and it is meant to cover the maximum surface area of the intersecting sections in the roof. You need to get started by inspecting the roof for locating such sections. Commonly weatherproofed areas of the roof include those with seams, joints or edges that are inherently prone to moisture seepage.
Understand Valley & Step Flashing
Using valley flashing is recommended for weatherproofing sections of the roof where the roof meets another surface at an ascending angle. Valley flashing ensures that water doesn’t collect in the space (shaped like a ‘valley’) present between the slopes. This flashing directs water to the outside without letting it make contact with any other roofing or wall surface.
If you are weatherproofing the base of a chimney, using a step flashing is recommended. Step flashing is installed around the base of a chimney. As the name suggests, this kind of flashing has a staircase-like structure that is very capable at directing the rainwater away from the roof.
Use Vent Pipe Flashing for Roofing Pipes
Vent pipe flashing has a very precise use. It is installed along pipes that protrude through the roof. This is also among the simplest of roof flashings to install. It can be easily covered with shingles to camouflage its presence and to make the flashing-covered surface more immune to moisture seepage.
Use Two-layered Metal Flashing
If you are located in an area with extreme temperature changes, using a two-layer metal flashing is recommended. This flashing is very similar to the conventional, single-layer metal flashing but it contains two metal layers that are compacted against each other but not fastened with screws. This allows the flashing sheets to contract or expand upon seasonal temperature changes, ensuring that no gapping is created in the weatherproofed section of the roof.
Weatherproof Tight Corners
You need to have a basic understanding of corner metal flashing methods. These are used when demanding corners are present in the roof. Here, you have two options. You can use two metal flashings, bend them around the corner and then seal them using roofing cement, some shingles and caulk. However, this creates the risk of the sealed joints getting weaker over a period, giving way to moisture seepage. The better option is to hire a roofing solutions provider and procure a custom-made metal flashing for the corner. However, if you are well-versed with metalworking and soldering, you can create a corner flashing yourself.
Choose Aluminum Flashing
Aluminum flashing is among the most lightweight and malleable of metal flashing options. If you have a roof with many corners or if you are apprehensive about working with metal flashings, using aluminum flashing is recommended. Aluminum flashing is rather easy to bend and cut and it is more maneuverable than other metal flashing options.
Drip Edge Flashing to Prevent Rainfall Damage
Using drip-edge metal flashing is recommended if you are located in a high-rainfall area. This flashing is present along the roofing edge. Its looks like a long metal strip that is simply nailed along edge of the roof. This flashing ensures that water dripping off the roof doesn’t run along the inner surfaces like the siding or fascia that can cause molding and corrosion.