Repair and replacement of the metal at roof joins, walls and additions, where many roof leaks start.
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Flashing is the metal that seals each joint where a roof meets a wall, chimney, dormer or skylight. When it lifts, cracks or pulls away, meltwater and wind-driven rain get under the roof covering and into the structure. A technician traces the entry point, replaces the failed pieces in a matching metal, and checks that the joint sheds water downhill.
Flashing is the sheet metal, and sometimes membrane or cap, that seals every place a roof surface meets something else. That means the wall above a roof edge, the chimney, a dormer cheek, a skylight curb and the seam where one roof plane runs into another. Shingles and slate shed water well across open roof, but the covering alone cannot stop water at a joint. The flashing has to turn water away from the gap and back onto the roof surface, in the right direction, every time it rains.
Worcester roofs are rarely one clean surface. The three-decker belt, built mostly from the 1880s to the mid-1920s, has tight lots, porch stacks and bays that break the roof into many pieces. Older houses pick up dormers, porch roofs and side sections over the decades, and each of those changes adds joints. Local weather puts the joints under stress. Nor'easters bring wet snow and gale-force gusts through the season that runs from September to April, and the freeze-thaw cycling that works on asphalt shingles can also work on sealed edges, mortar and the caulk around a curb.
A flashing repair is usually a small job with a large effect. The first task is to find where water actually enters, which is often some distance from the stain on the ceiling. Water runs along a joint, under a lapped piece or down a wall cavity before it shows inside. Replacing the wrong piece wastes the visit, so the work starts with the joint, then the metal, and only then the finish.
Do not work on a steep, wet or snow-covered roof to look at flashing, and do not use heat tools near the joint. Avoid ladders on a frosted surface. Do not stand on the roof to clear snow or ice, and do not place heavy equipment there unless a registered professional engineer approves it, as the state's roof-collapse guidance warns. If you see sagging, a severe leak, a cracked wood member or doors popping open, leave the building and call 911 from outside.
The technician checks the attic first for staining, soft wood and rust on fasteners, then goes onto the roof to lift the shingle courses above and below the suspect joint. Each open point is marked before any metal comes off, so the repair follows the path the water takes rather than the stain on the finish.
Old metal is lifted without tearing the shingles or the masonry, and the wood under it is examined. If the sheathing is soft, the crew replaces it before the metal is reset, because new flashing laid over rotten wood holds nothing in place.
Replacement metal matches the existing type where that type is sound. Where the flashing touches the gutters or valleys, the crew keeps to one metal or a compatible pair, since mixed metals in contact with water corrode each other. Step pieces, counter-flashing and drip edges are cut to the real shape of the joint, not to a template.
Each piece is laid so that water passes over it and downhill, with the upper pieces lapping the lower ones. Shingles are woven back around the metal, and nails are placed where the lap keeps them out of the path of water.
The technician checks each joint, clears debris from the valley and gutter outlets, and notes what was replaced and in what metal. That note helps the next person who opens the same joint, and it gives the homeowner a plain record of the work.
The technician looks at the joint from the attic and from the roof, because a stain on the ceiling is usually the last place water shows itself. The open metal is often higher up the slope than the stain.
The attic is read first. The rafters and sheathing beside the chimney, dormer or wall are checked for dark staining, soft wood and rust on nail heads, and the wet area is marked. From the roof, the technician lifts the shingle courses above and below the joint and looks at the lap, the nail line and the metal edge. A loose nail, a bent flange or a crack along a bend usually tells a clear story.
Flashing should be one metal type where possible, chosen to suit the gutter and the roof covering. Dissimilar metals in contact with water corrode each other.
The National Park Service guidance on historic slate roofs says to use one metal type for flashings and gutters to avoid galvanic corrosion. Where two dissimilar metals sit in contact with water, the less noble one wastes away, and the failure appears as a pinhole or a split at the joint rather than across the whole sheet.
Not as a lasting repair. Roofing mastic and sealants harden, crack and make later work harder, so they are not a viable fix for failed flashing.
The National Park Service says this plainly for historic roofs, and the same logic holds on asphalt and metal. A thick bead of sealant can look like a fix for a few weeks and then trap moisture beneath it, where the metal and the wood can no longer dry. The sealant also hides the next leak and forces the next repair to remove it before any metal can be reset.
The price depends on how many joints are open, how steep and walkable the roof is, how the flashing is laid, and what the building and the street allow. The price is explained and approved before work starts.
The number and length of the joints matter most. A single chimney counter-flashing is a different job from a wall-to-roof run across an addition with many step pieces. Access is next. A steep three-decker roof, a tight side yard or a shared drive changes how the crew sets up and how long the work takes, and the height of the building adds time on a high section. Metal type and the amount of cutting and fitting matter too, as does whether masonry, stucco or siding around the joint must be opened.
Note where the leak shows, when it happens, and whether it follows wind or a thaw. Photograph the stain and the ceiling if it is safe to do so.
Wind-driven rain points to a joint on the windward side of the house, and a leak that appears only during a thaw points to ice and meltwater at a valley, chimney or wall. Write down the date of each occurrence and the weather at the time. Those notes make the diagnosis faster and help the technician decide which joint to open first.
A brick chimney that crosses a pitched roof takes counter-flashing set into the mortar above the base flashing, with step flashing at each shoulder. The work is in the mortar as much as the metal, so the two are repaired together. A good flashing set under a cracked crown still lets water into the masonry, which is why the crown is checked too.
Where a roof runs into a vertical wall, step flashing is woven shingle by shingle with the courses, each piece lapping the one below it. It is one of the most common repairs on additions and rear sections, where the wall above the roof was often built at a different time from the roof below it. Each step has to be read as part of a single path.
Valleys carry more water than any other part of a roof, and the metal in them is worked hard by rain and snowmelt. Repair means reseating or replacing the valley metal and the shingle courses that lap it. The technician also checks the valley metal against the gutters, since the National Park Service guidance on historic roofs warns against mixing metals that touch.
Worcester's three-decker houses are tall and close-built, with porches, bays and rear sections that put one roof against another. Each meeting of roof and wall is a flashing line. In a three-decker, a failed joint can show its first stain on an upper floor while the open metal sits above it, under the eave or against the wall where the next roof begins.
Central Massachusetts winters work on joints in a particular way. The National Weather Service describes nor'easters as most frequent and most violent between September and April, and they bring heavy wet snow and gale-force gusts. A winter that alternates snow, thaw and refreeze pushes meltwater into any joint that has begun to loosen, so flashing that held through one season can open in the next.
Older flashing in this housing stock can be a mix of metals and of generations. An old lead-coated copper piece may sit beside a newer section, or a gutter may be a different metal from the valley it drains into. A technician checks the metals before choosing a replacement, because the National Park Service advice on mixing metals applies to any roof of this age.
Tell us what's happening and we'll tell you honestly whether it's a quick fix, and what roof flashing repair should cost.
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Tracing a leak from the ceiling stain back to where the water actually enters the roof.
Repair of the metal and mortar joint where a brick chimney passes through the roof, and of the crown above it.
Repair of leaking skylight curbs, flashing and seals, and installation of new units, on Worcester roofs that take heavy winter snow.
Installation and repair of gutters and downspouts that carry meltwater off Worcester roofs before it can refreeze at the eaves.
Slate on a late-1800s or early-1900s Worcester roof is usually worth repairing rather than replacing.
A homeowner can look from the attic, note where daylight or staining appears, and take photographs. Sealing from the roof is different. Sealant tends to trap moisture and hide the real entry point, and a loose piece lifted to apply it can crack further. If water is coming through the ceiling, call a technician before the next storm rather than painting a product onto the surface.
Water follows the framing and the underside of the roof deck before it drops, so the stain may sit several feet from the joint. Wood carries moisture along rafters and under sheathing, and insulation can hold water against the framing. Diagnosis starts from the stain and works back to the source.
A short crack or a single lifted piece can often be replaced locally. Where the metal is corroded, distorted or worn through, replacing the detail is usually the better answer. The decision depends on the metal type, the joint and the condition of the wood beneath it, and the technician explains which applies.
Snow that sits against a wall or at a chimney can melt and refreeze at the edge of the metal, pushing water back under it. Massachusetts guidance warns about heavy snow on flat and low-pitched roofs, and a homeowner should never stand on the roof to clear it. A technician repairs the joint after the thaw so the metal can be seen and fitted properly.
Minor roof repairs can need a permit in Massachusetts unless the building official considers the work an ordinary repair. Work that alters or repairs a structure needs one under the state building code. Worcester's Department of Inspectional Services can say which applies. Phones are answered 24/7, and a visit the same day happens only when a technician is free.
Coverage depends on the policy and the cause. The state's Division of Insurance says ice-dam damage may be covered if it was sudden and not caused by a lack of maintenance. Photograph the damage before any work begins, and ask the insurer about the wording of the policy.