If you are searching for a fireplace builder, it is important to know the warning signs of an outdoor fireplace that may be unsafe or poorly built before problems turn serious.
A fireplace builder can help identify safety issues early and prevent costly repairs or hazards.
Outdoor fireplaces add warmth, comfort, and atmosphere to patios and backyards. They create a place to gather with family and friends during cooler evenings. But when an outdoor fireplace is built incorrectly or not maintained properly, it can become a safety risk instead of a feature you enjoy.
This guide walks through five clear signs that your outdoor fireplace may need professional attention. Understanding these signs helps you protect your home, your guests, and your outdoor space.

Why Outdoor Fireplace Safety Matters
Outdoor fireplaces deal with open flame, heat, gas lines, and masonry. When any part of the system is installed incorrectly, the risks increase.
Unsafe fireplaces can lead to:
- Fire hazards
- Gas leaks
- Structural collapse
- Smoke exposure
- Damage to nearby structures
Many issues start small and are easy to overlook. Spotting the signs early can save money and prevent dangerous situations.
Sign 1: Cracks in the Masonry or Firebox
Cracks are one of the most common warning signs of a poorly built outdoor fireplace.
Small surface cracks can be normal over time, but larger cracks or growing gaps are not.
Watch for:
- Cracks in the firebox walls
- Gaps between stones or bricks
- Loose or shifting masonry
- Pieces of mortar falling out
These issues can allow heat or flame to escape into areas that are not meant to handle it. Water can also enter cracks, freeze, and cause more damage over time.
A professional fireplace builder in Delaware County, PA can determine whether cracks are cosmetic or a serious safety concern.
Sign 2: Smoke Blowing Back Toward Seating Areas
An outdoor fireplace should direct smoke away from people and structures.
If smoke blows back toward seating areas, it often points to poor design or installation.
Common causes include:
- Incorrect firebox depth
- Poor chimney height or placement
- Improper airflow design
- Blocked or undersized vents
Smoke backflow makes the fireplace uncomfortable to use and can expose people to harmful smoke.
If you notice smoke lingering or moving toward the house or seating area, stop using the fireplace until it is inspected.
Sign 3: Gas Smells or Inconsistent Flames
For gas outdoor fireplaces, gas issues should never be ignored.
Warning signs include:
- Smell of gas near the fireplace
- Flames that flicker, sputter, or burn unevenly
- Delayed ignition when turning the fireplace on
- Pilot light that frequently goes out
These issues may indicate improper gas line installation, poor connections, or faulty components.
Gas problems are serious safety risks. If you notice these signs, turn off the fireplace and contact a professional immediately.
Sign 4: Signs of Water Damage or Rust
Outdoor fireplaces are exposed to rain, snow, and moisture. When water is not properly managed, damage follows.
Look for:
- Rusted metal components
- White powder on masonry surfaces
- Stained stone or brick
- Soft or crumbling mortar
Water damage can weaken the structure and shorten the lifespan of the fireplace. It also increases the risk of cracks and shifting materials.
Proper installation includes drainage planning and material choices that handle outdoor conditions well.
Sign 5: The Fireplace Was Not Built to Code
One of the most overlooked safety issues is improper installation that does not meet local codes.
Outdoor fireplaces must follow guidelines related to:
- Clearance from structures
- Proper foundation depth
- Venting and airflow
- Gas line placement
- Firebox materials
If your fireplace was built without permits or inspections, there is a higher chance it does not meet safety standards.
A qualified fireplace builder in Delaware County, PA understands local codes and builds fireplaces that meet these requirements from the start.
How Poor Construction Affects Outdoor Fireplace Performance
A poorly built fireplace does not just pose safety risks. It also affects how well the fireplace works.
Common performance problems include:
- Difficulty starting or maintaining a fire
- Uneven heat distribution
- Excessive smoke
- Rapid wear and tear
These problems often trace back to shortcuts taken during construction or lack of proper planning.
Professional design and installation reduce these issues and improve long term performance.
Can You Fix an Unsafe Outdoor Fireplace?
In many cases, yes. The solution depends on the problem.
Minor issues may involve:
- Replacing damaged mortar
- Sealing cracks
- Adjusting airflow components
More serious problems may require partial rebuilds or structural reinforcement.
A fireplace builder can inspect the fireplace and recommend the safest and most cost effective solution.
When to Stop Using Your Fireplace
Some signs mean you should stop using the fireplace immediately.
These include:
- Strong gas odors
- Large or expanding cracks
- Loose masonry pieces
- Flames reaching areas outside the firebox
Continuing to use an unsafe fireplace increases the risk of injury or property damage.
When in doubt, it is best to pause use and schedule a professional inspection.
How Proper Design Prevents Fireplace Safety Issues
A well-built outdoor fireplace starts with proper design.
Key design elements include:
- Correct firebox size and depth
- Proper chimney height and placement
- Quality materials rated for heat
- Stable foundation and footing
- Adequate clearance from nearby structures
These details work together to create a fireplace that is safe, efficient, and durable.
Skipping any of these steps can lead to the problems discussed earlier.
How Often Should an Outdoor Fireplace Be Inspected?
Even well built fireplaces benefit from regular inspections.
A general guideline is:
- Visual checks before each season
- Professional inspection every one to two years
- Immediate inspection if problems appear
Routine inspections help catch small issues before they become safety hazards.
About Kelly Masonry and How We Can Help
Kelly Masonry works with homeowners throughout Delaware County, PA to design and build outdoor fireplaces that are safe, functional, and built to last. Our team understands proper masonry construction, ventilation, and material selection for outdoor fireplace projects.
Whether you are concerned about an existing fireplace or planning a new one, we help evaluate safety, address issues, and create outdoor fireplaces that fit your space and lifestyle.
If you are looking for a trusted fireplace builder in Delaware County, PA, contact Kelly Masonry to discuss your outdoor fireplace project and ensure your outdoor space is safe and enjoyable for years to come.





