Outdoor fireplaces

An outdoor fireplace is the single most expensive thing per square foot of enjoyment in this trade, and it is also the one most likely to be built wrong in a way that cannot be fixed afterwards.

Unlike a patio, a fireplace does not float. It is a tall, heavy, rigid masonry structure, and it needs a footing below the 42-inch frost line the same way a deck post does. A fireplace built on a patio base will move, and when a chimney moves it cracks.

Why fireplaces smoke, and why it is not fixable later

A fireplace draws because the flue area, firebox opening, throat and smoke chamber are proportioned to each other. Get that geometry wrong and the unit pushes smoke into the seating area instead of up the chimney. There is no accessory that fixes it — the correction is rebuilding the firebox.

This is the most common failure we are called to look at on fireplaces built by general contractors rather than masons. Ask specifically how the flue is sized relative to the opening. If the answer is vague, walk.

Footing, because this one cannot float

A patio at 11 inches deep rides frost movement as a single flexible mass. A seven-foot masonry chimney cannot. It needs a poured footing below frost depth — roughly 42 inches in southeast Michigan — sized for the mass above it.

A fireplace set on the same base as the surrounding patio will heave differentially from that patio, open a gap at the hearth, and eventually crack through the firebox. We have seen it, and the repair is a demolition.

Fireplace or fire pit?

Be honest about which you actually want, because the price difference is four to five times.

A fire pit seats people in a circle, everyone gets heat, and it suits a group. A fireplace seats people in an arc facing one direction, gives you a vertical architectural feature and a mantel, blocks wind, and directs smoke up and away rather than into whoever is downwind. If your patio is exposed and windy, or you want the structure to define an outdoor room, the fireplace earns its cost. If you want to sit around a fire with six people, the pit is better and cheaper.

Where it goes matters more than what it looks like

Prevailing wind in this county is generally from the west and northwest in winter. Placing a fireplace so it blocks that wind turns a patio into a genuinely usable shoulder-season space. Placing it on the wrong side turns it into an ornament.

Clearance from the house, the roofline and any overhanging branches all constrain placement, and a chimney needs to terminate high enough to draw properly rather than eddy against a nearby wall. We work that out before anything is priced.

What we will tell you to skip

Pizza-oven inserts get used a handful of times a year in this climate and add real cost. Television mounts above an outdoor firebox expose electronics to heat and weather and we generally advise against them. Neither is a bad idea if you genuinely want it — but buy them knowing how often they will actually be used.