In Manville about one home in four is a two-family house, and in Raritan Borough, North Plainfield and Bound Brook it is about one in six. Water that gets in over the upstairs unit can run down a wall and show up first in the apartment below. With your tenant's okay we look in both units before we decide where the repair goes.
Attached houses are the other common case. In Bedminster 41 percent of homes are attached, and in Bernards Township 22 percent. Your roof shares a line with the house next door, so a stain in your ceiling can start at that seam. We check it before we blame your shingles, and if the source is on a roof the association owns, we tell you.
North Plainfield's median house dates to 1954, and 64 percent of its homes were built before 1960. On roofs that old, the weak points are where something comes through or two slopes meet, and many have been patched with tar more than once. Below the Highlands, storms swing between rain and snow, and the slush in those valleys freezes again overnight.
So the stain is where we start, not where we stop. We follow the water to the spot it enters and show you photos before any repair.