A good roofer should be an expert at installing roofing, of course. But roofing jobs need more than roofing—they also need flashing. Even if roofing is perfectly installed, a flashing error can lead to major leaks and rot.

屋顶工应该安装闪烁：

• At the perimeter of most roof planes, including at eaves, rakes, valleys, and ridges;
• At penetrations like vent pipes, chimneys, and skylights;
• Where roofs meet walls or dormer cheeks;
• 在滴水可能导致腐烂的地方。

Code requirements

In the 2018 International Residential Code, flashing requirements can be found in Section R903.2. According to the IRC, “Flashings shall be installed at wall and roof intersections, wherever there is a change in roof slope or direction and around roof overhangs. A flashing [kickout flashing] shall be installed to divert the water away from where the eave of a sloped roof intersects a vertical sidewall.”

The terms used to describe roof flashing usually refer either to the location or purpose of the flashing. Flashing types include dripedge, kick-out flashing, step flashing, ridge flashing, chimney flashing, vent pipe flashing, valley flashing, skylight flashing, and flashing associated with roof-mounted PV arrays.

Flashing profiles (and flashing methods) vary depending on the type of roofing being installed. Roofers who install asphalt shingles usually use generic flashing pieces that are widely available, while installers of less common types of roofing (including metal roofing and concrete tile roofing) may need to buy proprietary flashing profiles from the roofing manufacturer or bend their own flashing pieces with a brake.

直到1970年左右，所有屋顶闪烁都是由金属制成的，包括铜，铅，镀锌钢或铝制。然而，近几十年来，塑料材料，橡胶材料和剥皮产品已经开始代替某些类型的传统金属闪光。

For information on different flashing materials, see…