Masonry and factory-built chimney repair in Belmere

What a rain cap does and what it cannot do

A rain cap sits over the flue outlet and keeps rain and debris from dropping straight down the lining. That spares the damper, the smoke chamber and the firebox from water that would otherwise run down inside.

Three details matter when one is chosen. On a masonry chimney, the Florida Building Code sets the open area under a rain cap at no less than four times the area of the flue outlet it serves. BIA guidance says to get the maker's information on how a manufactured rain cap affects gas flow, and it says a metal cap should be corrosion resistant. A cap that restricts the outlet, or one that rusts, trades one problem for another.

What a rain cap cannot do is protect the crown around it. Rain hitting a cracked crown still soaks into the masonry, cap or no cap. Our chimney cap replacement service fits the cap itself, and when the crown underneath is failing, your Belmere estimate says so on a separate line.

Offsets and corbeled sections in a chimney

Not every chimney rises in a straight line. Some step out from a wall or jog sideways partway up, built by corbeling, where each course of brick projects a little past the one below. The Florida Building Code limits how far a chimney may be corbeled from a wall or foundation and how far any single course may project.

It limits offsets as well. In a chimney with a clay flue liner and one wythe of masonry around it, the center of the flue above an offset may not extend beyond the center of the chimney wall below, unless approved masonry support sits under the offset.

Because the code limits both, cracks at a corbel or an offset get a closer look than cracks in a straight run. When cracks show there, the estimate says whether the section is sound enough to repair or has to be rebuilt.

Decorative shrouds on a factory-built chimney top

A shroud is a decorative metal housing set over the top of a chimney to hide the cap and pipe. On a factory-built chimney, the Florida Building Code allows one only where it is listed and labeled for that specific chimney system and installed per the maker's instructions.

The top of a factory-built chimney is part of what was tested. A shroud that encloses the cap can change conditions at the outlet, and the code ties it to the system's own listing. A catalog shroud can look right and still sit outside it.

If a shroud is already in place, the details below show whether it was made for your system. A listed one is repaired or replaced with the listed part. An unlisted one comes off, and the estimate shows the cap or listed shroud that replaces it.

• The maker and model on the chimney label
• A matching listing for the shroud itself
• An install that follows the shroud maker's instructions

The label on a relined flue

When a flue is relined with a material outside the standard list in the Florida Building Code, the code asks for a permanent label in plain view close to where the connector enters the chimney. It names the type of appliance and the fuel the flue is for, and warns against connecting anything else.

The label matters more later than on the day of the install. It tells the next buyer, home inspector or installer what the flue was built for. Without it, someone may connect a different appliance to a liner that was never meant for it, or assume a lining suits a new appliance when it does not.

If your chimney was relined and the label is missing or unreadable, it is worth putting back. Our technicians identify the lining where it can be seen and confirm what it serves. A replacement label goes on the estimate alongside any other flue repair, and if the lining cannot be identified, the estimate says so.