Cape Cod houses are everywhere in the towns around Elizabeth: a story and a half, a steep roof, and often a dormer or two on the front or a wide shed dormer across the back. The upstairs rooms are tucked under the roof itself. That design packs a lot of house into a small footprint, and it creates two common roof problems: leaks where dormers meet the main roof, and upstairs rooms that are hard to keep cool.
Where Capes Leak
- Dormer walls. Each side of a dormer meets the main roof along a wall. That joint relies on small pieces of metal called step flashing, woven in with the shingles. When they rust, or when someone sealed the joint with caulk instead, water gets in.
- Dormer valleys. Where a dormer roof meets the main roof, water from two directions joins in a valley.
- Chimneys. Many Capes have a chimney through the steep front or back slope.
- The knee wall spaces. Behind the short walls upstairs are small attic spaces. Leaks often show there first, out of sight.
Why the Upstairs Runs Hot
In a Cape, the sloped ceilings upstairs sit almost directly under the roof. There's often little space for insulation and less for air to move. In summer, the sun heats the shingles, and that heat comes straight into the bedrooms. The same heat cooks the shingles from below, shortening their life. In winter, warm air leaking into those spaces can melt snow on the roof and form ice at the cold edge.
What a Reroof Can Change
A replacement is the best chance to improve how a Cape roof breathes:
- New step flashing at every dormer wall, not reused or caulked.
- Intake vents low on the roof and exhaust at the ridge, with a clear path for air between them where the framing allows.
- An ice barrier along the eaves and in every valley.
- Checking the knee wall spaces for wet insulation or wood while the roof is open.
Insulation upgrades may involve a separate trade, but planning them with the roof makes sense. Lighter, more reflective shingles can also help in summer; the U.S. Department of Energy explains how they work: Cool asphalt shingles.
Look Before You Call
If you can safely open the small doors to the knee wall spaces, take a flashlight and look after a rain. Stains on the roof boards or damp insulation show the roofer where to start.
Questions
Why does my Cape leak only in certain storms?
Wind-driven rain from one direction can push water behind dormer flashing on that side. Note the wind direction when it leaks.
Is a shed dormer harder to roof than a small one?
It has a longer, lower roof that drains slowly, and it meets the main roof along a longer line. Both need careful work.
Can the upstairs be made cooler without a new roof?
Sometimes, with better attic ventilation or insulation. A roofer can tell you what's possible from the outside and when it's best done with a reroof.
Around Elizabeth
Capes fill whole streets in Union, Kenilworth and Clark. Shingle roof repairs are covered on shingle roofs.
Mansard, Gambrel and Steep Older Roofs
Unusual shapes, and what they ask of a roofer.
Putting Solar on an Older Roof
Why the roof usually comes first.