Our photo shows the bottom end of a single-piece of (damaged) sloped-roof-wall flashing. Step Flashing at Roof-Wall Abutments - Steep Slope Roofs? Use of Continuous Single-piece Solid Metal Flashing vs. Our photo above shows leak stains on the interior of the building wall where this log wall-roof-flashing installation had no counterflashing. Installing step flashing but no counterflashing at a sloped-roof to sidewall abutmentįlashing against irregular sidewalls such as this up-state New York cabin (above left) can require some thought.Īgainst a curved log wall where counter-flashing is needed, we'd need to use custom-formed lead counterflashing as is done on tile roofs, or cut a reglet into the wall deep enough to bend the counterflashing and hook it into the wall to keep wind-blown rain and wall run-down rain from moving behind this step flashing. The new shingle courses have to line up exactly with the original shingle course/step flashing placement, the old step flashing is often bent-up during old shingle removal, making it hard to get the new shingles to lay flat.Īs we see in our step flashing re-use at re-roofing time photo (left) the installer cut the new shingles too long so they have two reasons to be buckled, lifted, and vulnerable to wind-blown rain leaks at this building wall. Re-Using Step Flashing When Re-Roofing?Īt re-roofing time, when the old shingles are to be torn off, it's not always so easy to re-use the original step flashing that extends up under the building siding. See CAULKS & SEALANTS More Questonable or Ugly Roof-Wall Flashing Examples Exposed nails in flashing, not sealedīelow we illustrate that using a single piece of metal flashing where the uppermost edge of a shed-roof abuts a vertical building sidewall works fine, though the use of exposed nails (see our photo below) may form leak or wear points in the roof.īelow we discuss the very different case of the use of single-piece versus step flashing at the abutment of the side of a sloping roof to a building sidewall. Just above, at a similar abutment of a roof to a vertical wall, we illustrate a proper installation of flashing, in this case lead, installed at the abutment of a lower roof to a masonry wall on a building near Goodrich Castle in Ross on Wye in Herefordshire in the U.K. That lip is then set into a reglet or groove, in this case cut into the mortar joint of the brick wall above.Ībove the flashing lip the groove is sealed with mortar or with a sealant to prevent water from running behind the flashing and to hold it in place. To install the roof-wall flashing above the builder bent the top edge of the flashing into a 90-degree lip about 2 cm in width. Proper Roof-Wall Flashing Example: horizontal roof abutting vertical wall Use metal step flashing and counter-flashing where a lower shigle roof abuts a side-wall.
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