Is It Normal for There to Be Screws Through Flashing Into Stucco on a New Roof?

If you have just invested in a new roof, seeing exposed screws driven through your metal counter-flashing directly into your stucco siding can be alarming. In the world of high-quality roofing, the "best" way to install flashing involves hiding fasteners or tucking metal into a groove. However, whether or not it is "normal" depends on the specific type of flashing used and the age of the stucco. Here is the technical breakdown of when screws are acceptable and when they indicate a shortcut.

1. Understanding the Two-Part Flashing System

In a professional stucco-to-roof transition, there are usually two layers of metal:

• Step Flashing: L-shaped pieces of metal that go under the shingles and up behind the stucco (installed before the stucco is applied).
• Counter-Flashing (Cap Flashing): A second layer of metal that sits on top of the stucco to cover the top edge of the step flashing. This is what you see from the ground.

2. When Screws are "Normal" (Surface-Mount Flashing)

If the roof is being replaced on an existing home where the stucco is already dry and hard, roofing contractors often use surface-mount counter-flashing.

• The Method: The metal is placed against the stucco, and screws (often with neoprene washers) are driven through the metal into the wall to hold it tight.
• The Sealant: If your contractor used screws, there must be a "caulk flange" or a bead of high-grade polyurethane sealant along the top edge of the metal. The screws provide the mechanical pressure to keep that seal tight against the uneven surface of the stucco.
• Is it ideal? It is "normal" for a standard roof replacement, but it is not the "premium" architectural method.

3. When Screws are "Not Normal" (Reglet Flashing)

On high-end installations or new construction, you should not see screws in the face of the metal. Instead, contractors use a reglet joint.

• The Method: A shallow groove (kerf) is cut into the stucco using a diamond blade. The top edge of the flashing is bent and "tucked" into this groove.
• The Fastening: The metal is held in place by friction or small hidden clips, then sealed with a bead of mortar or caulk inside the groove. This creates a much cleaner look and a more permanent water barrier.

4. The Danger of "Pinning" the Metal

One reason why screws through the face of the flashing can be problematic is thermal expansion.

• Metal expands and contracts significantly as it heats up in the sun.
• If a long piece of flashing is pinned tightly to the stucco with multiple screws, the metal may "buckle" or "oil-can."
• This movement can eventually pull the screws loose or crack the surrounding stucco, leading to capillary action where water is sucked behind the metal.

5. What to Look for During a Roof Inspection

If your new roof has screws through the flashing, check for these three "Red Flags":

1. Missing Washers: Screws should have rubberized washers. A plain drywall screw or wood screw will rust and leak immediately.
2. Lack of Sealant: If the screw is there but there is no "lap" of caulk over the top of the metal, water will simply run down the wall and go behind the flashing.
3. Cracked Stucco: If the screws were driven too hard, they might have "spalled" or cracked the stucco finish, which allows moisture into the wire lath system behind the wall.

Conclusion

Is it normal to have screws through flashing into stucco? Yes, for a standard retrofit or roof replacement, surface-mounted flashing with screws is a common industry practice. However, it is a secondary method compared to a reglet-tucked flashing. If your contractor used screws, ensure they are corrosion-resistant, equipped with neoprene washers, and backed by a continuous bead of solar-stable sealant. If the screws are bare and the metal is loose, it is a defect that needs to be addressed before the next rainstorm.