Flashing A Skylight In A Cedar Roof

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.

Flashing a skylight in a cedar roof. Epdm uses contact cement to glue the rubber to the metal. Most residential skylights sit on a raised curb made watertight with metal flashing. In other words no more than 1 above the butt of the roofing material of the next course. 1 lift up the shingles next to the skylight one at a time and brush out any dirt and debris.

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. Typical projection flashing counter flashing jack plumbing stack certi label shake or shingle joint step flashing 3 laps bottom apron flashing top head. Copper flashing and cedar roofing. The installer starts at the bottom of the skylight with the sill flashing.

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. When a skylight is installed on a flat roof then the flashing around it should be one solid piece. Flashing is installed to surround roof features such as vents chimneys and skylights. That is one of the more difficult areas to accomplish and to make sure it would last a long time without leaking.

Typical projection flashing figure 14e. The shingles must be installed close enough to the skylight so that the bottom flashing has proper coverage. 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. Some skylights come with a kit and you don t have to build the aprons and install step fl.

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

Skylight installation roof projection flashing details figure 14d. Skylight flashing figure 14b. Velux skylight flashing kits are designed to shed water without relying on sealants that can break down over time. 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.

Then press down on the roofing shingles to seal them tight.