A brown ring on the ceiling is one of those things you can stare at for days without getting any wiser. It is there, it may be getting bigger, and you do not know whether to call now or whether it can wait until after the winter.
The good news is that the patch itself tells you quite a lot. Not enough for certainty, but enough to know whether it is the roof or something else.
Five causes and how to tell them apart
The roof. Appears during or shortly after rain, is usually on the top floor and often has a clear edge because water has collected there several times. Often not directly below the source, because water first runs along the structure.
A pipe. Appears regardless of the weather and grows on dry days too. Often under a bathroom, kitchen or toilet, and usually a stain that gradually spreads rather than a sharp ring.
Condensation. Several small spots instead of one ring, often in the corners or along the edge, and worst in the cold months. See
condensation or leak.
Penetrating damp. Usually against an outside wall and running on from the wall. Comes from the facade or a wall junction, not from the roof surface.
A blocked drain. A gutter or downpipe that overflows, after which water comes in via the roof edge or the wall. See
a gutter that overflows.
“The question that gives the quickest answer is not where the stain is but when it appears.”
Fouad, owner of Astrodak Service
What the colour and shape tell you
A yellowish to brownish ring with a darker edge means water has collected there several times and came about the same distance each time. That is a recurring leak, so weather-dependent and usually the roof.
An evenly dark patch that feels damp, with no clear edge, means there is water there now. That is active and calls for action the same day. A patch with white or grey-green growth means there has been damp for some time and mould is starting. If the paint is flaking or the plaster is coming loose, the damp has already soaked into the board.
Ring with edge
recurring
weather-dependent
A leak? Do not let it spread.
A leak you leave for a season usually costs ten times as much in follow-on damage. Call or send a message: you will get an answer today, from me personally, not from a scheduler.
What you should do now
Put something underneath. A bucket and a towel. If the ceiling is bulging, deliberately make a small hole at the lowest point to let the water drain in a controlled way. That sounds wrong, but it prevents a whole board from coming down.
Take dated photos. Of the patch, of the attic and of the weather. You will need them if insurance gets involved. See
insurance for a roof leak.
Look in the attic. Directly above the stain and a few metres around it. Feel whether the roof boarding and insulation are damp, and photograph what you see.
Do not wait for better weather. A leak can almost always be repaired, even in autumn. Waiting makes the repair more expensive because timber and insulation get involved.
And if it is not the roof?
Then I will say so. I regularly come out to a damp patch that is caused by a pipe or penetrating damp, and then a roofer is not who you need. I will tell you what I think it is and who you should call in instead. That costs me half an hour and saves you a wrong bill.
If it does turn out to be the roof, the next step is
tracing the real cause. We cover Vught, Den Bosch, Boxtel, Sint-Michielsgestel and the surrounding area, the same day for emergencies. See the
page on roof leaks.
What to write down before you call
Three things speed up the search considerably. When did the patch first appear, and does it appear during the rain or only a day later? In what weather does it get worse, and which direction was the wind coming from? And is it still growing, or has it stayed the same for months?
With those three answers I can often narrow down a search area before I arrive. A patch that only gets worse with a south-westerly wind is on that side of the roof, and then we do not need to check the other half. That saves search time and therefore costs.
Frequently asked questions about damp patches
