Should I call a roofer or the water damage crew first?
Call both, but the water comes first. The water damage crew stops the water inside, removes it and dries the structure. A roofer is needed to find and repair the source on the roof. Both calls are worth making on the same day if the water is still coming in.
Tarping or temporary protection on the roof is a roofing job, and the roofer is the one to say what it needs. The water damage crew can tell the roofer what it has seen from inside, which often narrows the search.
Keep the roofer's written scope and any photographs of the roof. Those help with the repair and with any insurance question, and this site cannot say what a policy covers.
Why does water show up far from the leak?
Water on a roof runs along the roof deck and the framing before it drops. It reaches the ceiling at the lowest point, which can be a long way from the entry. The stain shows where the water landed, not where it came in.
The insulation holds water and carries it along the top of the ceiling. A drip in one corner can be a sign of a wet run that reaches several feet of ceiling, so the crew reads the whole ceiling, not only the stain.
This is why a roof leak takes longer to dry than it seems. The readings tell the crew when the insulation and framing are dry, and the repair waits for that.
Can the water damage be dried while the roof is still leaking?
Only partly. Drying can begin inside once the water is removed, but water that keeps entering keeps the readings high. The crew protects the rooms and removes what it can, and it says clearly when the source has to be stopped before drying can finish.
The first priority is stopping the water from reaching the rooms below. Containers, sheeting and moving belongings do that while the roofer works out the repair.
The crew does not promise the roof will stop leaking before rain returns. That is for the roofer to say, after the roof has been looked at from outside.
What about insulation and the attic space?
Wet insulation rarely dries back to a useful state, because it holds water and loses its loft. Where insulation is soaked, it is usually removed and replaced after the framing has dried. The attic space is checked by the crew wherever it can be reached safely.
Attic work is done carefully. The crew uses a safe access, keeps its footing on the framing, and avoids walking on the insulation. The readings in the attic show which areas are wet and which are dry.
Insulation replacement is a separate decision and is discussed once the framing has been read dry. The crew explains the choice and does not make it for you.
What affects the cost of a roof leak job?
The area of ceiling and insulation affected, the number of rooms below the leak, the materials to be removed, and how many days the drying takes. The roof repair is quoted separately by the roofer. The figure is explained on site and agreed in writing before any work starts.
A small stain in one room is quicker to handle than a leak that has run along a whole ceiling line into several rooms. The number of cuts and the amount of insulation to be replaced are the main drivers of the water damage side.
This site does not publish any figure for roof leak work, and neither the crew nor the roofer should give you one before the source and the scope are known.