Level 1 sweep and inspection to the NFPA 211 annual standard - flue, crown, cap, and flashing checked and photographed
Chimney sweep logs do not sweep chimneys. They loosen some creosote - which then falls where a brush and vacuum still have to collect it.
Before
After
Before
After
Before
AfterGelco Flue Liner Replacement: The Northampton Owner’s Guide
We stock and install Gelco-compatible flue liner replacement parts right here in Northampton, with most complete liner swaps running $1,900 to $3,400 installed depending on length, diameter, and chimney accessibility. We keep the common Gelco liner diameters on the truck, so in many cases we can handle the job the same week we come out to look. Here’s the scenario we see most often: the liner looked fine during the last sweep, but six months later there’s rust flakes piling up at the cleanout door, or the furnace draft feels weak, or the CO detector started chirping near the flue path. The Gelco liner didn’t fail overnight. It has been thinning out for years, and now the pinholes are talking.
What matters in Northampton specifically is the freeze-thaw cycle. Old brick chimneys pull in moisture, the liner sweats, and the stainless starts to go. We see it more in the rowhouses near Lincoln Avenue and the older colonials out toward the borough line than we do in newer builds. The liner style Gelco is known for works well until it doesn’t, and when it doesn’t, you need a straight answer on replacement, not a lecture.
Key Takeaways
- We match your Gelco liner by measuring the old one, not by guessing from the model badge.
- Most Northampton replacements take one day, start to finish.
- You get camera footage of the old liner before we touch anything. If it doesn’t need replacing, Wendell will say so.
- Every liner job carries the 90-Day Done Right Promise in writing.
Which Gelco Models This Applies To
Gelco built their name on flexible stainless and aluminum liners, and the replacement path depends on which family yours came from. The common ones we run into in Northampton are the Gelco Flex series in 5.5-inch, 6-inch, and 7-inch diameters, plus a handful of rigid stainless sections from the Gelco line used for furnace and boiler venting. The liner diameter is the critical measurement. If your old liner is 6-inch, a 5.5-inch replacement won’t just slide in and call it a day. It changes the draft math, and on an oil or gas appliance, that means flue gas sitting where it shouldn’t.
Find the ID tag. Gelco liners usually carry a small metal tag near the top connector, and it lists the diameter and sometimes the alloy. If the tag is gone, we measure the inside diameter with a gauge and match the replacement to what’s actually there. One gotcha worth knowing: some Gelco liners were sold as “316 alloy” and some as “304.” For wood-burning fireplaces in Northampton, where creosote gets damp and acidic, 316 lasts noticeably longer. We tell homeowners that up front, because paying the difference once beats replacing the liner twice. We’re an independent chimney company that installs and services Gelco products, along with DuraFlex and HeatShield. We’re not tied to any one brand, so if a different liner matches the chimney better, we’ll tell you.
Signs Your Gelco Flue Liner Replacement Is Failing
- Rust flakes or discolored dust at the cleanout. That’s the inner wall of your liner sloughing off. Once you see visible rust at the base, the liner is usually compromised at multiple points higher up.
- A draft that used to be fine and now isn’t. If the fireplace smokes back into the room on days when it never used to, pinholes in the liner may be letting outside air into the flue path and breaking the draft column.
- CO detector activity near the flue path. A failing liner doesn’t just vent poorly. It can leak. If the detector near the furnace or water heater closet has gone off, treat it seriously and have the liner inspected before the next burn.
- Visible cracks or gaps at the liner joints. On rigid Gelco sections, the seam points fail first. You might see them with a flashlight from the cleanout or from the top of the chimney.
- Moisture stains on the chimney interior walls. A liner that’s thinned out lets moisture condense inside the chimney chase, and that moisture wicks into the surrounding masonry and shows up as damp spots.
Replacement Cost & What’s Included
For a Gelco flue liner replacement in Northampton, expect $1,900 to $3,400 installed. The spread comes down to three things: how many feet of liner the chimney needs, what diameter we’re matching, and how much of the old liner has to be cut out before the new one goes in. An 18-foot run of 6-inch 316 stainless costs more than a 12-foot run of 5.5-inch 304. Straight swaps with good chimney access land at the lower end. Jobs where the old liner is collapsed or the chimney crown needs repair wind up higher.
Every estimate includes the liner itself, the top plate and rain cap, the labor to remove the old liner and install the new one, and a camera inspection after the fact so you can see it’s in right. We give you the price before a single tool comes off the truck, and the number on the invoice matches the number on the quote. That’s not a promotion. That’s just how Wendell has run Top Hat Chimney since 1999. And every liner replacement carries the 90-Day Done Right Promise in writing. If it’s not right, one call brings us back.
DIY or Call Us?
You can check the cleanout door for rust flakes. You can shine a flashlight up the flue from the bottom and note whether the walls look solid. You should absolutely keep an eye on the CO detector near the appliance. But pulling a Gelco liner and feeding a new one is not a Saturday-afternoon job. You’re working on a roof, sometimes in Northampton’s shoulder-season weather, and you’re handling a stainless flex liner that wants to kink if it’s fed wrong. A kinked liner in a live flue is worse than the old one you pulled out. And if the liner serves a furnace or boiler, a bad venting job doesn’t whimper. It puts carbon monoxide into the house.
If you’re not sure whether the liner is actually bad, call (484) 859-1367 and ask for a camera inspection. We’re glad to come out, run the camera, and show you what we see. If it does not need doing, Wendell will tell you. If it does, he’ll get it done right.
FAQs
A 316 stainless Gelco liner in Northampton typically lasts 15 to 25 years, while a 304 liner in a wood-burning flue can start showing pinholes in 10 to 12 years. The freeze-thaw moisture cycles and damp creosote in this area accelerate corrosion more than dry climates do. Call (484) 859-1367 and we’ll tell you which alloy makes sense for your chimney.
Small pinholes can sometimes be addressed with a patch or a resleeve in a short section, but most Gelco liners that show visible rust at the cleanout are compromised across several feet and a patch just buys time. The honest answer depends on what the camera shows. A free second opinion on any written estimate is always on the table.
Most Gelco flue liner replacements in Northampton are finished in one day, including removal of the old liner, the new liner install, and the post-install camera check. Taller chimneys or ones with a failed crown can stretch into two days. We’ll tell you the schedule before we start.
We keep common Gelco-compatible liner diameters on the truck in 5.5-inch, 6-inch, and 7-inch, along with top plates and caps. If your chimney needs an uncommon size or a rigid section, we can usually have it in hand within a few days and schedule the install right after. Call (484) 859-1367 to confirm what’s available for your specific liner.
Call Top Hat Chimney for a Straight Answer
If you’ve got a Gelco liner that’s failing or you’re not sure it is, call (484) 859-1367. A live person answers, around the clock, and it may well be Wendell himself. We’ll set up a camera inspection, show you what’s actually going on inside that chimney, and quote you a fair price before any work begins. We serve Northampton and the surrounding communities with the same straightforward approach we’ve used since 1999. No pressure, no mystery invoices, and no job done until it’s done right.
Written by Wendell Pike, Owner, Top Hat Chimney at Top Hat Chimney, serving Northampton and nearby areas.