A wood insert installed to its manual in Lake Sunset

Clearances measured from the insert body

Each insert manual carries a clearance table for combustible materials around the unit. The Pacific Insert guide measures from the insert body and gives separate minimums for an adjacent sidewall, a mantel, top facing and side facing, with a drawing of each.

Those numbers apply to your chosen model only, which is why we never quote an installation from a general rule. At the inspection we measure every combustible surface near the opening and compare it with the table, and anything that falls short appears in the estimate with the fix we propose.

• Wood mantel shelf above the opening
• Wood or painted trim at the sides
• A wall that meets the fireplace at a corner
• Shelving or cabinets built beside the hearth

The first fires and paint curing

A new insert's paint cures during its first fires, and that can produce a smell. The Pacific guide notes that smoke detectors may sound more often during this period, and it tells owners not to disconnect them.

We explain the break-in fires your manual describes and suggest opening windows for fresh air while the paint cures. The odor fades as the curing finishes, and a smoke alarm that sounds during that time should be left connected, with the room ventilated instead.

An insert for occasional evenings

Not every owner wants an insert to heat the house. Some want a cleaner, more controllable fire for a handful of cool evenings, with the flame behind glass and less room air pulled up the chimney.

That is a perfectly good reason to install one, and it steers the choice toward smaller fireboxes, larger glass and simple controls. We plan the installation around how you will actually use the fireplace, and we will say so if a gas or electric option would suit those few evenings better.

Water in the firebox before installation

Staining, rust on the old damper or a damp firebox floor are signs that water is entering the flue. An insert placed into a wet fireplace inherits that problem, and its steel body is less forgiving of standing water than brick.

When we see signs of water, we trace the likely source at the top of the chimney and include the fix in the scope. The liner cap then keeps rain out of the insert itself once the work is done.