Attic Ventilation and Ice Dams on Low-Slope Ranches
Why icicles form, and what actually stops them.
EDISON · MENLO PARK
An old roof, a second layer or an ice dam on a Menlo Park home? Repair or a new roof, one call.
Menlo Park is where Thomas Edison opened his laboratory in 1876, and the reason the whole township eventually took his name. Today it's mostly a neighborhood of mid-century homes near Route 1 and the Menlo Park Mall, which opened in 1959. Many of those houses are ranches with low-slope roofs and attics that were never well ventilated. Some have a second layer of shingles laid over the first sometime in the 1980s or 1990s. What you see on a cold week is icicles at the eaves and, sometimes, water coming in at the top of an outside wall. What it usually means is an ice dam: heat from the house melting snow that refreezes at the colder edge.

A ranch with two layers is due for a full tear-off when it's replaced. That's also the moment to fix the ventilation and add ice barrier at the eaves, so the next roof doesn't get the same ice dams.
What Menlo Park homeowners usually call about: leak and storm repair, a new shingle roof, a roof on an addition or garage, metal roofing, a flat section, or simply finding a roofer.
If you see big icicles at the same corner every winter, mention it on the call. It points the roofer at the attic before the shingles.
Why icicles form, and what actually stops them.
Why a second layer changes the next job.