One day it is dry, the next there is water on the ceiling, and then it stops again. An intermittent leak that only shows up during heavy rain or high wind is one of the most common calls we get, and one of the most frustrating problems a homeowner can have. The roof looks fine most of the time, which is exactly what makes it hard to pin down.
These leaks are rarely random. There is almost always a specific reason water gets in only under certain conditions, and finding it is what we do. If you have one of these, Warren Thompson & Son can track it down before it does real damage.
It Takes Enough Water to Reach the Gap
A small crack or a tiny gap in the flashing may shed a light drizzle without a problem. It is only when the rain comes down hard and fast that enough water pools or runs to reach the weak spot and push through. That is why your leak seems to wait for the worst storms. The defect is always there. The conditions to expose it are not.
Wind-Driven Rain Changes Everything
Most roofs are built to shed water running downhill. They are not built for water being driven sideways and upward by a strong wind. Wind-driven rain can get under shingles and behind flashing in ways that ordinary rain never would. This is why a leak might appear during a windy storm and stay hidden during a calm, steady rain.
The Usual Suspects
Flashing is the most common culprit. The metal around your chimney, skylights, and vents is where most leaks start, and a small failure there can stay quiet until the conditions are right. Cracked or missing shingles, worn pipe boots around vents, and clogged gutters that let water back up under the roofline are the other frequent offenders.
The tricky part is that water does not always come in where it shows up inside. It can travel along the decking or a rafter and drip down feet away from the actual entry point. This is why chasing the stain on your ceiling rarely leads you to the real problem.
Why You Should Not Wait
An intermittent leak is still a leak. Every time it rains hard, a little more water gets into your roof structure. Over time that means rotted decking, ruined insulation, mold, and stained ceilings. The damage is progressive, and the longer it goes, the more it costs to fix. A problem that starts as a simple flashing repair can turn into a structural one if it is ignored long enough.
How We Find It
Finding an intermittent leak takes experience and a methodical approach. We inspect the likely entry points, trace the path the water is taking, and test our way to the source rather than guessing. Once we know where it is getting in, the repair is usually straightforward. The hard part is the detective work, and that is where decades on local roofs pays off. The folks at Family Handyman also have a helpful primer on how leaks travel if you want to understand the basics.
Tired of putting a bucket out every time it storms? Call Warren Thompson & Son at (908) 774-9229 and we will find the source. We are open seven days a week.
