Open or sandy mortar joints
Mortar washing out lets water into the wall.
Parapet wall repair and rebuilding in New York, NY
The low wall around a flat roof takes weather from both sides and the top. When its joints open or its flashing fails, water runs down inside the wall and shows up on the top floor.
- We answer 24/7
- Repoint, rebuild, reflash
- Street-facing parapets
Quick answer: Parapet repair in New York, NY ranges from repointing open mortar joints and renewing the roof-side flashing to taking down and rebuilding a leaning or bulging parapet. Street-facing parapets also fall under the city's annual observation rule, and an unsafe condition has to be corrected within 90 days.
What the job involves
Why parapets fail before the rest of the wall
A parapet is exposed on both faces and the top, so it gets wetter and goes through more freeze and thaw than any other part of the building. Mortar washes out, brick faces spall, and the steel anchors that tie coping and wall together rust and expand.
On the roof side, the membrane turns up the wall as base flashing, with counter flashing lapped over its top. When either fails, water gets behind the membrane and into the wall. Repairing the roof without the parapet leaves the leak where it was.
Your options
Repoint, partial rebuild or full rebuild?
| Option | When it fits | What to know |
|---|---|---|
| Repointing | The wall is plumb and the bricks are sound; only the joints have failed. | Least disruptive. The mortar has to suit the brick. |
| Partial rebuild | Top courses loose, cracked or out of line. | Unsound courses come down; new ties and flashing go in. |
| Full rebuild | The whole parapet is leaning, bulging or unstable. | The biggest job, often with sidewalk protection and filings. |
Cost factors
What parapet repair costs depend on
Repoint or rebuild
Repointing costs far less than taking down and rebuilding courses.
Length and height
Linear feet of wall and how many courses are affected.
Access and protection
Street-facing work can need a sidewalk shed or netting.
Brick and mortar matching
Salvaged or matched brick and a compatible mortar.
Flashing
New through-wall and roof-side flashing.
Permits and approvals
Filings, and Landmarks review in historic districts.
Variations of the job
Parapet work we do
Leaning or bulging parapet
A parapet out of plumb or bulging has lost its bond or its ties. It is checked for stability, and a section that is unsafe is taken down and rebuilt rather than patched.
Open mortar joints
Joints are ground out to a sound depth and repointed with mortar matched to the brick. Mortar harder than the brick makes the brick itself crack, so the mix matters.
Parapet rebuilding
The unsound courses come down, bricks are salvaged where possible, and the wall is rebuilt with new ties and a through-wall flashing under the coping.
Inside-face flashing
The roof-side flashing is renewed up the wall and under a counter flashing or the coping, so water running down the wall is shed onto the roof, not behind it.
Local conditions
The annual parapet rule and what it means for repairs
Since January 1, 2024, every New York City building with a parapet facing a street, sidewalk or other public right-of-way needs that parapet observed once a year, whatever its height, with detached one- and two-family homes exempt. It closes a gap, since the facade inspection program leaves out low-rise buildings. When an observation finds an unsafe condition, the repair has to be done within 90 days.
How it runs
How parapet work runs
- 1
Look up close
From the roof, with photos of cracks, bulges and open joints.
- 2
Protect the public
Sidewalk protection where street-facing work needs it.
- 3
Repair the masonry
Repoint or rebuild the unsound sections.
- 4
Flash it
Through-wall flashing, coping and roof-side flashing.
- 5
Record it
Photos and notes to keep with the building's records.
Warning signs
Parapet problems you can see from the roof
Cracked or spalling brick
Freeze and thaw breaking the face off bricks.
A wall out of plumb
Leaning or bulging means lost bond or failed ties.
Loose or cracked coping
Water gets straight into the top of the wall.
Flashing pulled away from the wall
Water running behind the membrane.
Stains on top-floor walls
Water traveling down inside the masonry.
Questions we hear
Parapet wall questions
If it has a parapet facing a street, sidewalk or other public right-of-way, very likely yes, whatever its height. Detached one- and two-family homes are exempt.
It is not filed with the Department of Buildings. The owner keeps each report for six years and provides it if the department asks.
An unsafe condition has to be reported, the public protected with a shed, fence or netting, and the condition corrected within 90 days.
Clear sealers and coatings can trap moisture in brick and speed up spalling. The joints, flashing and coping have to be repaired properly.
Both. The masonry, the coping and the roof flashing work as one system, which is why they are repaired together.
Related services
Related roofing work
Coping Stone & Cap Replacement
Cracked clay tile, loose stone and rusted metal caps let water straight into the top of a wall. We reset, replace and flash coping.
Learn moreRoof Flashing Repair
Base flashing, counter flashing and pitch pockets fail long before the open field of the roof does. Often the most cost-effective fix on a building.
Learn moreChimney Flashing & Repair
Step flashing, counter flashing and crowns where brick meets roof, repaired so the chimney stops feeding water into the top floor.
Learn moreParapet cracked or leaking?
Call and we will look at it up close and tell you whether it needs repointing or rebuilding.