Custom Masonry Fireplace Build (Rumford)

A masonry fireplace is the one feature a home is built around, and the one most often built wrong. Get the firebox geometry, throat, and smoke chamber slightly off and you own a beautiful fireplace that smokes the room every time you light it. Prime Chimney Experts builds masonry fireplaces — including tall, shallow Rumford designs prized for radiant heat — the way a premium brand should: engineered to draft correctly the first time and crafted in firebrick and refractory mortar to last generations.

Drafting is physics, not luck. The Rumford geometry that throws heat — tall opening, shallow firebox, sharply angled covings — only works when every ratio is honored: the opening-to-flue area, the throat dimension, the smoke shelf, and a smoke chamber corbeled to a smooth, symmetric slope. We lay the firebox course by course in firebrick set in refractory mortar to spec, parge the smoke chamber smooth so it streamlines draft instead of catching creosote, and size the flue to the opening. This is the engineering most masons skip — and the entire reason our fireplaces pull cleanly.

The build is a full system, not just a pretty face. We pour a code-depth reinforced footing to carry the mass, set the steel lintel over the opening, stack and bed clay flue tile (or run a listed liner) plumb course by course, build the chase or stack, and form-and-pour a proper overhanging crown with a drip edge so water sheds clear of the brick for the life of the chimney. In a tight modern home we recommend — and run, where local code calls for it — a dedicated outside combustion-air intake so the firebox draws makeup air from outdoors rather than starving the room.

Finish is where a PCE fireplace announces itself: the firebox laid clean and true, the hearth extension built to the code-required projection, the surround detailed to the design. Because we control the structure beneath the finish, the visible work sits on something sound — no hairline-cracking firebox, no settling hearth, no crown that sheds water down the face. We sequence each stage to cure and be inspected before the next, and we pull the build permit and coordinate rough-in and final inspections.