Do you ever find out that after a few months of roof installation, the roof has several leaks and broken tiles on it? If your answer is “Yes”, then you should consider doing roof flashing immediately.
What is roof flashing? This article will give you a detailed explanation about it, and some advice about reinforcing your roof to make it last longer.
Roof flashing is a roll of thin metal, which is placed under the shingles or between the joints where the roof’s surface intersects with a projection such as a chimney, dormer wall,…
Roof flashing is resistant to moisture and strong winds so that it can prevent the roof from water damage through leaks and reinforce roof tiles.
The most popular materials used to make roof flashing are galvanized steel, copper, and aluminum. Galvanized steel is often used in buildings, while aluminum is suitable for a do-it-yourself project because of its flexibility to bend, and copper is used for copper roofs.
Based on the area that you are going to apply roof flashing, there are various types of it to choose from:
A roof valley is a V-shaped place where 2 roof slopes meet. As its name suggests, the roof valley is where the raindrop drips down and gradually penetrates the roof surface to create leaks.
To solve that problem, we need valley flashing. The metal sheet will be placed under the shingles, keeping each roof slope from touching each other. By doing that, water will run across the edge of the roof slope, into the flashing, and down to the rain gutter, with minimal damage to the roof valley.
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Flashing is sealed between shingle courses running along with the chimney. Along the sides, counter flashing is mortared into the stone courses and goes down over the top of the step flashing.
Besides, flashing is also mortared into the chimney’s front side at the end of the roof slope and on top of the next shingles, so that the rain will run across that way and cannot damage the chimney.
Vent flashing prevents water from accumulating around the vents and pipes. They can be a plumbing vent, hood vent, or pipe from the woodstove. The metal flashing has a central spout opening, which is made of these 2 materials:
The flashing has a metal square piece at the bottom. To install it, the central part will slip over the pipe or vent, underneath the roofing and run along with the top and back edge (the front edge does not need covering). This allows water to run out of the vent’s opening.
Drip edge flashing is the L-shaped sheets made of metal, installed at the edge of the roof. They play the role of directing water away from the fascia (an area that suffers water damage directly from rain) and into the gutter.
Also, wrap flashing around the rake edges, so that the outmost shingles will not be blown away by strong winds.
For skylights, a continuous piece of flashing is used to seal along the base to the top to keep water away from them. Skylights often knob out from the roof, so it would be easy for you to apply flashing around them.
Among all parts of the roof, the skylight is the most sensitive one affected 100 percent by water damage from the raindrops pouring down vertically. Therefore, you should always ensure to seal the skylight flashing before settling down in a new house.
This technique is used for the areas where the roof intersects a wall, like a roof dormer protruding out of the roof. When it rains, water drops can flow down the wall, run through the shingles, and go inside the house.
Step flashing works well in that situation; it directs the water away from the wall to run down into the gutter. It is installed in steps, with layers of shingles between, ensuring that the rain falls on each step and runs along the roof.
This is often used for chimney flashing. Counter flashing contains 2 pieces of flashing:
Counter flashing is the technique of installing a second piece of flashing from the first one.
Vent flashing has a cylindrical shape to put around the vent. The shingles will be installed over the vent boot so that the boot will have enough height to keep the water run around the vent, not into it.
The price for roof flashing repair usually ranges from $200 to $500 for skylights, chimneys, and vents. Completely replacing the flashing costs $400 to $1,000, which includes sealing and replacing the surrounding shingles.
You can check out this video for a full tutorial:
These are the signs showing that it’s time to repair your roof flashing: