Ice dam and icicles along the eave of a Long Island house in winter

Alec's Construction repairs chimneys in West Islip, Suffolk County — crowns, caps, repointing, spalled brick and the roofline flashing — working out of the yard in East Patchogue.

What Chimneys Do Wrong in West Islip

Canal-side chimneys take wind-driven rain from the bay on one face, and it is always the same face that fails first. The flashing at the roofline and the top three courses of brick are where we start.

Flashing Before Masonry

If there is a stain on a ceiling anywhere near the chimney, the flashing is the first suspect and the masonry is the second. Chimney flashing is a two-part detail: step flashing woven in with the shingle courses, and counterflashing let into a cut in the mortar joint and lapped over the steps so water cannot get behind it.

What is on a great many Long Island chimneys instead is roof cement, troweled over the joint by somebody who was up there for a different reason. Roof cement is brittle within a few winters, it cracks, and it hides the failure while the water keeps going in. It also has to be chipped off before a proper repair can be made, which makes the eventual job larger.

Worker on a ladder at the gutter line of a Long Island house in autumn

The Crown and the Cap Are Two Different Things

The crown is the sloped surface on the very top of the chimney, covering the brickwork around the flue tiles, and it is what keeps water out of the masonry. On a lot of houses here it is a thin skim of mortar troweled over the brick — never the right material, cracked within a decade. A proper crown is cast concrete, reinforced, sloped, with an overhang and a drip edge and a bond break at the flue tile.

The cap sits above the crown over the flue opening, and it keeps rain, snow, debris and animals out of the flue itself. It should be stainless, not galvanised: galvanised caps rust, streak the masonry below and end up in the yard. A blocked flue on a gas or oil appliance is a carbon monoxide problem, which makes the cap a safety item rather than only a maintenance one.

Repointing, and the Mortar That Matters

Failed, recessed or missing mortar joints get cut out to depth and repointed. On older chimneys the mortar has to be compatible with the existing masonry — a mortar that is harder than the brick will not let the wall move, and the brick takes the damage instead. That is a real decision, not a bag choice, and it is worth asking about.

Spalled brick gets replaced. Coating it or repointing around it leaves the failure in the wall.

Permits and Departments in West Islip

West Islip files with the Town of Islip. Repointing, crown and flashing repairs are generally maintenance rather than permitted alterations, but rebuilding a chimney above or below the roof line is a different scope, and we confirm with the department rather than assume.

Book It Before the First Fire

Masonry wants temperatures above freezing to cure, so chimney repointing and crown work are autumn jobs on Long Island and the calendar fills from September. Flashing, caps and sheet-metal work can be done later in the cold.

Free walkthrough in West Islip. Alex goes up, photographs the crown, the cap, the joints and the flashing, and you get the photos whether or not you hire us.

Frequently Asked Questions

Why does only one side of my West Islip chimney look bad?

Because one face takes the wind-driven rain off the bay and the others do not. On canal-side lots it is consistently the same elevation that spalls, loses mortar and stains first. That is normal and it does not mean the whole chimney needs rebuilding — the usual scope is repointing the weather face, correcting the flashing on that side, and getting a proper crown and cap on before the next winter.

Do I need the chimney swept as well?

Sweeping and inspection are a chimney sweep's work and they are worth booking before the first fire of the season — a build-up of creosote in a wood-burning flue is a fire risk and a blockage in any flue is a carbon monoxide risk. Our work is the structure: the masonry, the crown, the cap and the flashing. The two jobs sit alongside each other.

Can chimney work be done in winter?

Masonry repairs want temperatures above freezing for the mortar to cure properly, so repointing and crown work are autumn jobs and we book them accordingly. Flashing, caps, chase covers and sheet-metal work can be done in the cold. If you call us in January with a leak we will stop the water and schedule the masonry for the spring rather than lay mortar that will fail.

What is the first thing to check on a chimney?

The flashing, if there is any sign of a stain on a ceiling near the chimney. Chimney flashing leaks are far more common than chimney masonry leaks, and roof cement smeared over old step flashing — which is what is on a great many Long Island chimneys — is brittle within a few winters. Proper step flashing with counterflashing let into a mortar joint is the real repair.

Related Guides

Also Serving West Islip

Work With Alec's Construction

This guide is written by the crew that does the work. See Alec's Chimney Repair service — repointing, crowns, caps and roofline flashing. One crew start to finish, free walkthrough and a written estimate inside 48 hours.

Booking the cold months now: we also handle Roofing and Seamless Gutters.

Get a Free Estimate from Alec's Construction

Working across Suffolk County since 2018, one crew from start to finish. We come out, look at the actual job, and put a written number in your hand — no pressure, no obligation.

Or call (631) 312-7441

No cost, no obligation. We reply the same day.