Roof Flashing: Four Types


In addition to the weather factors that threaten to infiltrate your home with a roof leak, water is one of the major factors that continuously threaten to wear down your roofing shingles. Shingles alone do not guarantee the protection against roof leaks you need.

There is, however, a big difference between flashing. You can find a variety of waterproofing materials, each of which contributes to retaining water flow off your roof. In terms of roof flashing, the following four are the most common:

1.  Edge of a drip

To prevent water from flooding the roof’s edges (eaves), drip edge flashing is needed along the roof’s edge (eaves). If an L-bend style run of metal flashing is not used, water can circle the last shingle or come in during a sideways rain and end up up your roof’s edge.

Your wood fascia boards will most likely rot or mold out if you don’t use a drip edge. If your roof deck is not built to handle water, they can ruin your home’s drywall and cause it to crack.

2.  Flashing of valleys

The roof deck will then be covered with felt underlayment and shingles will be laid over it. In the valley, two sections of roof combine to form an angle dip.

Without valley flashing, almost all roof leaks occur in valleys and shingles begin to erode. There are two shapes of this flashing: V and W. In fact, it should overlap a bit at the drip edge. All seams must be sealed with roof cement, and nails should be placed at the edge of the valley flashing.

3.  Flashing for Vent Pipes

Typically, round pipes pass through your roofs by way of this type of flashing. A cylindrical base lies flat on top of the roof and is capped with a flange at the bottom.

Vent pipe flashing around all pipes/flues protruding out of your roof is absolutely essential since they are a major source for roof leaks when left unprotected.

4.  Flashing of steps

In order to prevent water from flowing past the chimney where it touches the roof, step flashing is necessary around it. A different type of flashing is also used around skylights.

Step flashing is a “scale-like” arrangement of pieces that can be stacked down the roof. Water can avoid leaking under the flashing by using galvanized roof nails and roofing cement under each step.

There are many different styles and colors of metal roofing for roofing at Ridgeline Construction Roofing & Exteriors: Shingle & slate, Tile, Shake, Vertical panels, Standing seam. Feeling uncertain? Check out their website. You can rely on them for assistance. Through the selection process and installation process, their experienced team will provide you with the best guidance.

Roof cement can be applied to the tops of step flashing that can be screwed into the brick or stone along the steps of the flashing, creating a staircase-like effect.

A metal flashing can be purchased in different metals, but it has to be rust-proof. Additionally, different thicknesses and grades offer different wind resistances.

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