Repairing chimney water leaks in Fontainebleau

Earlier patches as clues

A chimney that has leaked before often carries layers of earlier repairs. Smears of sealant, patched joints and coatings each tell part of the story. They show where someone once thought the water was getting in.

We look at each patch and ask whether it is still sound or whether water is now bypassing it. A patch that failed can point straight at the path. A patch that holds can rule an area out. Tell us what you know about past repairs, even roughly.

Moisture that appears without rain

If a chimney stain or damp patch appears on dry days, rain may not be the cause. Moisture can form inside a flue when warm exhaust meets cool masonry, and plumbing or cooling lines in the attic can drip near the chimney.

Mention whether you have seen water in dry weather. It changes where we look. A flue that produces its own moisture is a lining question rather than a leak, and a pipe in the attic is a plumbing question. We say which the evidence points to.

What a leak repair estimate lists

A leak repair estimate should connect every item to the evidence behind it. Ours does, and for a chimney in Fontainebleau it lists the following.

Anything we could not confirm is marked that way. Upfront pricing covers each listed item. If something new turns up during the repair, it comes to you as a separate item for approval before any work on it.

• The symptom history and where water appeared
• The paths checked and which were ruled out
• The confirmed or likely source, with the evidence
• The repair for that source, and what it leaves out

Roof shapes that pour water at the chimney

The shape of a roof decides how much water reaches the chimney. Two roof planes may meet in a channel that ends at the stack. A broad slope may drain straight onto its back. Either one raises the load on the chimney sharply.

If your chimney sits in a spot like that, a leak may appear only in heavy rain, when the volume overwhelms the junction. We look at where water comes from on the roof as well as at the chimney. The findings say whether the roof shape is part of the problem.