Flashing A Skylight In A Cedar Roof

Skylight installation roof projection flashing details figure 14d.

Flashing a skylight in a cedar roof. Roof flashing is a thin material usually galvanized steel that professional roofers use to direct water away from critical areas of the roof wherever the roof plane meets a vertical surface like a wall or a dormer. In other words no more than 1 above the butt of the roofing material of the next course. Step flashing is laced over each course of asphalt shingles cedar shakes and shingles and most alternative steep sloped roofing materials no more than 1 above the weather exposure of the roofing being installed. The installer starts at the bottom of the skylight with the sill flashing.

Copper flashing and cedar roofing. 2 using a caulking gun loaded with a tube of roofing cement force the mastic up under the shingle where the metal flashing meets the roofing felt the thick black paper under the roofing material. The shingles must be installed close enough to the skylight so that the bottom flashing has proper coverage. Epdm uses contact cement to glue the rubber to the metal.

Properly installing a skylight requires detailed skylight flashing. Skylight flashing figure 14b. Typical projection flashing figure 14c. That s when the rubber roof gets attached to the flashing with adhesives.

After a row of roofing material is installed over the bottom edge of the underlayment the sill flashing is placed at the bottom of the skylight. Flashing is installed to surround roof features such as vents chimneys and skylights. 1 lift up the shingles next to the skylight one at a time and brush out any dirt and debris. Then press down on the roofing shingles to seal them tight.

Typical projection flashing counter flashing jack plumbing stack certi label shake or shingle joint step flashing 3 laps bottom apron flashing top head. A crucial part of our complete system. If it s carefully removed when the old roof is torn off it should be reusable. We offer a variety of skylight flashing systems to ensure a weathertight fit for virtually all roof types and slopes.

That is one of the more difficult areas to accomplish and to make sure it would last a long time without leaking. If not you ll have to buy new flashing 50 to 100 either from the skylight manufacturer or from a roofing company that has a metal fabrication shop look under roofing in the yellow pages or online. Copper is a popular flashing material with wood roofs although some experts caution against using copper in direct contact with red cedar or its runoff since the soluble tannins in cedar can etch copper and in extreme cases lead to perforation of the flashing within 10 to 20 years see also flashing wall details copper and metal choices for metal roof systems copper. Typical projection flashing figure 14e.

Most residential skylights sit on a raised curb made watertight with metal flashing.