Chimney relining Silver Spring was the focus of this recent project in the 20910 area, where one brick chimney served both an appliance flue and a fireplace flue. The scope called for two new M-Flex stainless steel liners, new venting connections, chimney-top repairs, and exterior sealing. Because each flue served a different purpose, each one needed its own correctly sized liner system and finishing components.
The roof-level photo shows the completed chimney with a rebuilt mortar crown and protected flue terminations. However, a roof photo cannot show the new liners and smoke chamber improvements inside the masonry chimney.
Request a Free Estimate for chimney liner or masonry work in Silver Spring. Call Chelsea’s Chimney at (301) 960-5664.
A Chimney Relining Silver Spring Project With Two Flues
This chimney had two separate venting paths. One served an appliance, while the other served the fireplace. Therefore, the project was not a one-size-fits-all liner replacement.
For the appliance flue, the plan used a 6-inch by 30-foot M-Flex UL-listed stainless steel liner. The installation also included a top plate, rain cap with animal guard, mortar collar, and all new connector pipes to the appliance. Each specified venting component was UL-listed.
For the fireplace, the project used an 11-inch inside diameter by 20-foot M-Flex .006 stainless steel liner. This scope was more extensive because the crew removed the existing flue tiles and throat damper before installing the new liner system.
For homeowners comparing options, see Chelsea’s Chimney chimney and fireplace service page:
Chimney Services
Two Different Flues, Two Stainless Steel Liner Systems
A chimney may look like one structure from outside, yet it can contain more than one flue. Each flue must match the appliance or fireplace it serves. Proper sizing, approved materials, and correct connections all matter.
Appliance Flue: 6-Inch M-Flex Liner
First, we relined the appliance flue with the 6-inch M-Flex stainless steel liner. A new top plate secured the system at the chimney top. In addition, a rain cap with an animal guard helps protect the opening from rain, leaves, and wildlife.
The project also included new connector pipes to the appliance. This detail matters because the liner is only one part of the venting path. Therefore, the connection from the appliance to the flue also needs compatible, properly installed components.
The specified liner carries a lifetime warranty. As with any product warranty, homeowners should keep their project paperwork and follow the manufacturer’s terms.
Fireplace Flue: 11-Inch M-Flex Liner
The fireplace side required a larger 11-inch inside diameter liner. Before installation, the crew removed the existing flue tiles and throat damper. The crew then insulated the new stainless steel liner with UL-listed insulation.
Insulation is an important part of many stainless steel relining systems because it helps the liner perform as designed within the masonry chimney. In addition, the project included a new top tile and a new top closing damper system.
The crew also parged the smoke chamber. Parging creates a smoother transition through the smoke chamber and corrects rough or irregular masonry surfaces. Because this area sits between the firebox and flue, careful preparation matters during a complete fireplace relining project.
Homeowners can also review Chelsea’s Chimney services for Silver Spring, including chimney inspections, repairs, flue lining, and caps:
Chelsea’s in Silver Spring
How We Completed Chimney Relining Silver Spring
Chimney relining Silver Spring projects often involve more than dropping a metal liner into an existing flue. The surrounding masonry, chimney crown, termination, insulation, and vent connections can all affect the finished system.
On this project, the appliance and fireplace flues received separate liner assemblies based on their use. The fireplace flue also required tile removal, insulation, smoke chamber parging, and a top closing damper. Meanwhile, the appliance flue received new connector piping along with its new liner.
At the top, the crew finished both flues with appropriate protection. The photo shows two capped terminations above the new mortar crown. One cap includes a large screened animal guard, while the other protects the second flue opening.
For general homeowner information about accepted chimney products, see the Chimney Safety Institute of America’s Accepted Products resources:
https://www.csia.org/acceptedproducts
Rebuilding the Cracked Mortar Crown
The liner work was only part of the repair. Because cracks had developed in the existing mortar crown, the crew cut out and removed the damaged material. The scope also called for replacing any deteriorated top tiles identified during the work.
Next, the crew installed a new mortar crown with an expansion joint around the flue tile area. This joint is important because the flue tile and surrounding crown can move differently as temperatures change. The separation helps reduce stress where those materials meet.
The new crown then needed time to cure. Therefore, the crew wrapped it with plastic during the curing stage. After curing, the crew returned to seal the expansion joint with NP1 and document the finished work with final photos.
A sound crown helps shed water away from the chimney structure. In Maryland, that matters because masonry faces rain, humidity, winter moisture, and repeated freeze-thaw cycles. Small cracks can allow water into the crown and surrounding masonry, so timely repair helps limit continued weather-related deterioration.
Schedule an Inspection if you see crown cracks, damaged flue tiles, or signs of chimney leakage. Call Chelsea’s Chimney at (301) 960-5664.
Chimney Relining Silver Spring Included Exterior Sealing
The project also addressed J-channel sealing on two sides of the chimney exterior. First, the crew cleaned debris from the channel. Then, the crew sealed the channel with white exterior caulk.
This step is separate from relining the flues, yet it supports the same goal. It addresses known openings and transitions where exterior weather exposure can become a problem. Good chimney repair often means looking at the complete system rather than treating one visible defect in isolation.
Finally, the crew removed job site debris from the crown removal, tile work, and other repairs. Clean-up is an important part of a professional project, especially when the work includes masonry demolition and flue tile removal.
What the Finished Chimney Shows
From the roof, the finished work presents a straightforward result: a brick chimney, a new mortar crown, and two protected flue openings. The left termination has a larger screened cap, while the right termination has a round rain cap and guard.
However, the visible finish represents only part of the job. Inside the chimney are two separate stainless steel liner systems. The fireplace side also includes insulation, a parged smoke chamber, and a top closing damper system. The appliance side includes new connector pipes to complete its venting path.
This is why a roof photo alone cannot tell the full story of a chimney’s condition. An inspection can evaluate accessible chimney components, while a Level 2 inspection includes a video scan of the flue. The NFPA 211 industry standard requires a Level 2 inspection when a chimney is being relined.
Chelsea’s Chimney has CSIA Certified Technicians, a CCR Certified Chimney Reliner, and OSHA-trained personnel. The company is licensed, bonded, and insured under MHIC #115994, and Saturday appointments are available.
Why This Silver Spring Chimney Project Matters
A relining project should match the venting system to the fireplace or appliance it serves. In this Silver Spring home, that meant using two liner sizes and two different installation approaches within the same chimney.
In addition, the crew did not stop at the liners. The scope included the cracked crown, top tiles, smoke chamber, damper system, caps, connector pipes, and exterior J-channel sealing. Addressing these items together created a more complete chimney repair.
This chimney relining Silver Spring project shows why liner work can extend beyond the liner itself. The chimney top, masonry, insulation, connections, and fireplace components may all need attention based on inspection findings.
For additional chimney services throughout Montgomery County, visit:
Chelsea’s in Montgomery
Chimney Relining Silver Spring FAQs
Why would one chimney need two different liners?
A masonry chimney can contain separate flues for different fireplaces or appliances. Because each flue serves a different venting need, a professional matches the liner size and configuration to that specific system.
Is stainless steel commonly used for chimney relining?
Yes. Stainless steel is a common material for relining masonry chimneys. The correct alloy, size, insulation method, and installation details depend on the appliance or fireplace and the existing chimney.
Why remove old clay flue tiles before installing a new liner?
Tile removal may be needed when the existing flue does not provide enough space for the correctly sized liner and required insulation. It can also be part of correcting damaged or unsuitable flue conditions. A professional inspection determines the proper approach.
What does smoke chamber parging do?
Parging smooths rough or irregular masonry in the smoke chamber. That creates a cleaner transition from the firebox toward the flue and supports proper restoration when this area needs repair.
Why does a chimney crown need an expansion joint?
The flue tile and mortar crown can expand and contract at different rates. An expansion joint allows some separation between those materials and helps reduce stress at the crown-to-tile connection.
Do I need a Level 2 inspection for chimney relining?
Yes. The NFPA 211 industry standard requires a Level 2 inspection for relining. It includes a video scan of the flue and provides a more detailed look at the chimney system before major changes are made.
Request a Free Estimate for chimney relining Silver Spring, crown repair, or related chimney work. Call Chelsea’s Chimney at (301) 960-5664.
