Chimney Questions, Plain Answers

NFPA 211, the national standard for chimneys and fireplaces, calls for an inspection at least once a year, with cleaning when deposits build up. A fireplace used every winter weekend usually needs a sweep every year.

Gas burns cleaner than wood, but flues still collect debris, nests and corrosion. A yearly check keeps the vent clear so exhaust leaves the house.

No. We cover the floor and seal the opening before we start, and we leave the room the way we found it.

Most homes take under an hour. A tall chimney or a hard roof can take longer, and we tell you before we start.

Yes, at least at the start and the end, so we can reach the fireplace and walk you through what we found.

Yes. Call as soon as you have a date and we will fit the inspection into your schedule.

It can wait a little, but freeze and thaw cycles widen cracks every winter. Fixing a crown or a few joints early costs far less than rebuilding.

We match brick and mortar color as closely as the material allows, so the repair blends in.

Yes. Pro 1 Chimney is licensed and insured.

If the damage is limited to joints or a few bricks, repair is the right call. We only suggest a rebuild when the masonry can no longer hold.

It depends on height, access and weather. You get a time frame with your written estimate.

We choose brick and mortar color to match the house as closely as possible.

Yes. A cap is the simplest way to keep rain and animals out of the flue.

The crown is the masonry or concrete top of the chimney. The cap is the metal cover over the flue opening.

Hairline cracks can be sealed. A crown that is broken through or crumbling should be replaced.

A flue that is too big or too small for the appliance can draft poorly and build up deposits. The appliance maker states what it needs.

Yes. A stainless steel liner can run down through the old flue in most chimneys.

Their exhaust is acidic and can attack old masonry flues, so many need a liner made for that fuel.

It is the repair of mortar joints: the old mortar comes out and new mortar goes in.

We match the color and joint profile as closely as possible.

Good repointing with the right mortar lasts many years. Crown and cap work helps it last longer.

Often it is where they meet: the flashing. We check both before we say which.

Yes. A breathable water repellent can help porous brick, after the cracks and joints are fixed.

As soon as you see water. Wet masonry and wood framing get worse with each storm.

A closed or broken damper, a cold flue, a blocked flue or a firebox that is too big for the flue can all cause it. We find which one.

Yes, with a new throat damper or a top-sealing damper at the top of the flue.

We work on the chimney, flue and venting of gas fireplaces.

Most homes need it about once a year, more often for large families or long duct runs.

You can clean the lint screen and the hood. A long or bent duct is easier to clean fully with the right tools.

Yes. Crushed or plastic duct should be replaced with rigid or semi-rigid metal duct.

Mostly water and temperature. Rain soaks into small cracks, freezes, expands and pries them wider. A crown poured tight against the flue tile can also crack as the tile heats and cools.

Sealing works on hairline cracks in a crown that is still solid. If pieces move, lift or fall off, a new crown is the lasting fix.

Not for the crown itself. If the fireplace is due for a sweep anyway, we can do both on the same visit.

Galvanized is cheaper up front but rusts. Stainless steel holds up much longer in rain and salt air, so it is what we usually suggest.

It can. A screen that is too fine can clog with soot on some oil appliances, and some gas appliances call for a specific termination in their instructions. We match the cap to what is venting.

A well-fitted cap with intact mesh closes the flue, which is how most animals get in. If one is already inside, it has to come out before the cap goes on.

Yes. On a flat roof the roofing membrane runs up the side of the chimney and the counter flashing covers its top edge. We work with the roof you have so the two lap the right way.

If the metal is sound and only the sealant has dried out, resealing can work. Rusted, torn or tar-buried flashing should be replaced.

A small peaked section built on the uphill side of a wide chimney on a sloped roof. It splits the water so it does not pool behind the chimney.

If the water comes through the brick itself, it helps. Leaks at the flashing, crown or cap need those parts fixed, so we check them first.

A breathable repellent soaks in and is meant to leave the brick looking much as it did. A shiny or painted finish is a sign of the wrong product.

Coatings that do not breathe can trap moisture inside the masonry. When that water freezes, it can push the faces off the brick.

A damper mounted at the top of the flue with a rubber or silicone seal, opened and closed by a cable that runs down to the firebox. Most also act as a cover for the flue.

It is not a good idea. A damper stuck partly closed can push smoke into the room, and one stuck open lets heat out all winter.

Yes. Many vented gas log sets call for the damper to be fixed partly open, and the log set instructions say how. We set it up to match them.

Coating the inside walls of the smoke chamber with a heat-rated mortar so the surface is smooth and the joints are sealed.

Smoke moves more easily along smooth, sloped walls. Ledges and open joints slow it down, hold creosote and let heat reach the masonry around the chamber.

In most cases, no. The work is done from the firebox, through the damper opening.

Fine surface cracks are common in a working firebox. Cracks that go all the way through, open joints and loose bricks are the ones that need repair.

Firebrick is made to take high heat. It is laid with thin joints of refractory mortar, which holds up where regular mortar breaks down.

Yes, on the firebox panels and the chimney. Panels have to be the parts listed for that fireplace, so we check the model first.

Loud rumbling, a hot metallic smell, sparks or flames from the top, or afterwards, puffy creosote and cracked tiles. A quiet one may only show up at the next inspection.

Yes. NFPA 211 calls for an inspection after an event, such as a chimney fire, that could have damaged the chimney. Cracked tiles are often out of sight.

Sometimes a few tiles can be repaired. When the damage runs through the flue, a stainless steel liner is the usual fix.

Please do not. Smoke can trap or injure the animal, and a nest in the flue can catch fire or push smoke back into the house.

Some chimney-nesting birds are protected. If there is an active nest with young, removal may have to wait until they leave, and we tell you plainly when that is the case.

A well-fitted cap blocks the flue, which is the usual way in. We also check the crown and flashing for other gaps.

Gas exhaust carries a lot of water vapor. In a cold or oversized flue it condenses into an acidic liquid that wears away clay tiles and mortar from the inside.

Not necessarily. A water heater left alone in a large flue built for a boiler can draft poorly. It often needs a smaller liner sized to it.

No. Boiler and water heater flues have their own sizing and liner type. A fireplace should have its own flue, so when both share one chimney, each flue is handled on its own.

Most insert makers call for a liner from the insert to the top of the chimney. It keeps the exhaust in a flue sized for the unit and makes cleaning easier.

Wood gives a real fire and needs regular sweeping. Gas is cleaner and easier to run, and needs a gas supply at the fireplace. We go through both with you.

Most masonry fireplaces in good shape can. A cracked firebox or a damaged flue gets fixed first, and some very shallow openings will not fit a standard unit.

No. We work on the venting and the chimney. If we see a problem with the burner or controls, we tell you so you can call a gas appliance technician.

NFPA 211 calls for chimneys, fireplaces and vents to be inspected at least once a year. That includes the vent on a gas fireplace.

A little condensation when the unit first starts is normal and clears as it warms up. Black soot that keeps coming back is worth a look.

Some removals do, depending on how much comes down and on the building. We tell you what your job needs before we start.

Yes. Taking it down below the roof line and closing the roof is a common choice. The part inside the house can stay.

In attached homes one chimney can serve more than one house. We check that first, because it changes what can come down.

Water soaks into the brick, freezes and expands, and the face breaks off. Mortar harder than the brick and coatings that trap moisture make it worse.

Older brick sizes and colors can be hard to find. We look for the closest match in size, color and texture and talk you through how close it will look.

No. Tuckpointing repairs the mortar joints. Brick replacement swaps out the bricks themselves. Many chimneys need a bit of both.

It depends on the stove. Each one carries a label and a manual with its clearances to walls, ceilings and furniture. Some makers allow less space with a listed heat shield, and only in the way the manual describes.

Most codes and stove makers call for a wood stove to have a flue of its own, not one shared with a boiler or water heater. Your local code has the final word, and we check it before we plan the job.

Many towns require one for a new wood stove and its chimney. We tell you what your town asks for before work starts, so the install can pass any inspection it needs.

NFPA 211 calls for chimneys and vents to be inspected at least once a year and cleaned when deposits build up. Oil-fired flues usually collect more soot than gas flues and tend to need cleaning more often.

Leave the boiler off. A puffback can coat the flue and the vent pipe with soot, so the flue should be cleaned and the burner checked by your heating technician before the boiler runs again.

No. We work on the flue, the chimney and the vent pipe connection. The burner and controls belong to a heating technician, and if we see something there, we tell you.

A general home inspector looks at what can be seen from the roof and the room. A chimney inspection goes into the flue itself, which is where cracked tiles, gaps and deposits usually hide.

Either can. Sellers often book before listing so repairs can be done or priced up front. Buyers often prefer their own inspection. Whoever books gets the written findings.

That is for the buyer and seller to agree on. Because each repair is listed separately with its own estimate, it is easier to decide what gets fixed now and what gets credited.

Humid air brings out the smell of creosote in the flue. When the house is closed up with the air conditioning on, air can also be drawn down the chimney and carry that smell into the room.

It can help as a last step, after the flue is clean. On its own it only masks the smell, and the deposits or the damp that cause it are still there.

A creosote smell points to deposits that should be swept. A smell of exhaust near a boiler or water heater is different: open a window, have the appliance checked and make sure your carbon monoxide alarms work.

It lets the house take in air without pulling it down the chimney. That tells us the house is short of air, which can be helped, but a window left open all winter is not a real fix.

A strip of metal fixed across the top of the fireplace opening. It makes the opening smaller, which helps when the opening is too large for the flue it feeds.

Yes. A chimney that ends low on the roof or close to a taller part of the house can draft poorly, especially in wind. Adding height can be the fix, and we check that against local code.

Codes set a minimum height above the roof and above anything within a set distance of the chimney. Your local building code and the appliance instructions give the exact numbers, and we measure against them on site.

Yes, as long as the brick below is sound enough to carry it. If the top courses are loose, they are rebuilt first, and the extension goes on top of that.

Matched brick and mortar blend in with the rest of the chimney. A metal extension is quicker but looks different, so we show you both options before you choose.

If one or two parts are worn, repair is the right call. We suggest a rebuild only when several parts have failed together, and we explain why in the written estimate.

Yes, within limits. The opening has to suit the flue above it, so we size the new firebox to the flue and tell you what that allows.

The work is inside the opening and at the hearth. The mantel and face brick can often stay, and we tell you before we start what has to come off and what will be put back.

Not quite. The cap is the hood over the flue that keeps rain out. The spark arrestor is the mesh screen around it. Most caps combine the two, but some only have the hood.

Yes. Creosote and soot build up on the mesh, and a clogged screen chokes the draft and pushes smoke into the room. That is why the screen is cleaned along with the flue.

Gas appliances do not throw embers, and some gas appliance makers call for a specific termination at the top. We follow those instructions and keep fine mesh off flues where it does not belong.