Smoke chamber parging and repair in Parramore

Fine surface cracks after curing

Depending on the application and curing conditions, small surface cracks or crazing may appear on a chamber coat after it cures or after use. The maker's data sheet describes these as of no functional concern.

We mention this before the job so it is not a surprise. At the next inspection, we look at the surface again. Crazing is one thing, and a crack that opens, lifts or drops material is another. The second kind is covered by our workmanship warranty.

Yearly inspection of a parged chamber

NFPA 211 expects every chimney, fireplace and vent to be inspected yearly at the least. A parged chamber belongs in that yearly look like every other part of the fireplace.

At each visit, we check the coat for cracks that have opened, areas that sound hollow and any buildup that has returned. We also check the shelf and damper seat. Most years the answer is a routine note, and the written record helps spot any change early.

• Coat surface and edges
• Smoke shelf and damper seat
• Buildup since the last visit

Keeping harsh cleaners off the coating

Some products sold for chimneys work by chemical action on deposits. The warranty conditions of the chamber coating we follow state that corrosive chimney cleaners must not be used on the repaired chamber.

If you use any chimney treatment, tell us what it is at the inspection. We will say whether it suits a parged chamber. In most homes, regular sweeping with the right brush and burning dry wood keep the chamber in good order without chemicals.

How a chamber rebuild proceeds

A rebuild removes failed chamber masonry and replaces it with new solid masonry laid to the required thickness and slope, then finishes the inside surface smooth with refractory mortar. The damper and the first flue tile are protected or reset as part of the work.

It is a bigger job than parging, with more time, more material and sometimes access from both the firebox and the roof. The written estimate describes each stage, and we walk you through it before you decide.

Naming the product in the estimate

Two chamber quotes can look alike until you ask what goes on the walls. We write the product name into every chamber estimate, along with the walls it covers and the planned thickness.

That lets you compare quotes fairly and keep a record for future inspections. If a different product would suit your chamber better once we open it up, we explain why before making any change to the plan.