Step Flashing

Step flashing is installed anywhere a sloped roof meets a vertical wall. Instead of using one continuous piece of metal, individual pieces of flashing are woven between each course of shingles. This layered installation helps direct water away from the wall and back onto the roof surface, where it can safely flow into the gutters.

Each piece of step flashing overlaps the shingle below it and is covered by the next course of shingles. This creates multiple layers of protection that work together to keep water out.

Properly installed step flashing is one of the most important components of a leak-resistant roofing system.

Where Is Step Flashing Used?

Step flashing is commonly installed:

• Where the roof meets a sidewall

• Along dormers

• Around roof-to-wall transitions

• Along porch roof walls

• Around chimney sidewalls (when used with counter flashing)

Any location where a roof meets a vertical wall requires proper flashing to prevent water intrusion.

Why Is Step Flashing Better Than Continuous Flashing?

Although some older homes were built using long pieces of continuous flashing, individual step flashing is considered the preferred installation method for asphalt shingle roofing systems.

Because each piece of flashing overlaps the next, water is directed back onto the shingles instead of being allowed to travel behind the wall or beneath the roofing materials.

Individual pieces also allow the roofing system to expand and contract with changing temperatures while maintaining proper water protection.

Most asphalt shingle manufacturers specify individual step flashing as part of their recommended installation details.

Typical Cost

Step flashing is typically included as part of a complete roof replacement and is not usually priced separately.

If existing step flashing is damaged, improperly installed, or incompatible with the new roofing system, it should be replaced during the roof replacement.

Benefits

• Directs water away from roof-to-wall intersections

• Helps prevent roof leaks

• Works with each course of shingles

• Allows for natural expansion and contraction

• Supports manufacturer installation requirements

• Helps extend the life of the roofing system

Why It Matters in Michigan

Michigan experiences heavy rain, wind-driven storms, snow, and repeated freeze-thaw cycles. Roof-to-wall intersections receive a large amount of water during these weather events.

Properly installed step flashing helps direct water away from these vulnerable areas, reducing the risk of leaks and protecting the roof deck, wall sheathing, and interior of the home.

Our Recommendation

At VanderLaans, we install individual step flashing in accordance with manufacturer specifications and applicable building codes.

Proper flashing is just as important as quality shingles. A roof can have the best shingles available, but if the flashing is not installed correctly, water can still find its way into your home.

Did You Know?

Many roof leaks occur where the roof meets a wall, not in the middle of the roof. Properly installed step flashing is one of the best defenses against leaks because it directs water away from these vulnerable areas one shingle at a time.