Question 1

Why are NYC chimneys deteriorating so quickly?

Accepted Answer

NYC's repeated freeze-thaw cycles cause water to freeze inside masonry pores, expanding and cracking the structure.

Question 2

What is the purpose of a chimney cap?

Accepted Answer

Caps prevent water entry, keep out animals and debris, stop downdrafts, and prevent sparks from escaping—essential fire protection.

Question 3

How long does a chimney rebuild last?

Accepted Answer

A properly rebuilt chimney with quality materials and waterproofing should last 50+ years with regular maintenance.

Question 4

Do I need a permit for chimney work in NYC?

Accepted Answer

Yes, chimney alterations, especially above roof line or structural work, require DOB permits which we handle for you.

Question 5

Can a chimney be repaired if it's leaning?

Accepted Answer

Minor leaning may be repairable with steel reinforcement, but significant leaning (over 1/2 inch per foot) typically requires complete rebuilding.

Question 6

How often should brick facades be repointed (tuckpointed) in NYC?

Accepted Answer

High-exposure NYC exterior facades typically require repointing every 25 to 30 years, while exposed rooftop parapets, chimneys, and windward elevations may require service every 15 to 20 years.

Question 7

What is NYC Local Law 11 (FISP) and does my building require it?

Accepted Answer

Local Law 11 mandates that all NYC buildings taller than six stories must have their exterior walls and appurtenances inspected by a Qualified Exterior Wall Inspector (QEWI) every five years.

Question 8

Why is historic lime mortar important instead of modern Portland cement?

Accepted Answer

Historic bricks are soft and porous. Using excessively hard Portland cement creates thermal stress that crushes brick faces (spalling). We custom-mix high-calcium lime Type N mortar matching the historic elasticity.

Question 9

What causes parapet walls to lean or bow outward on NYC brownstones?

Accepted Answer

Thermal expansion and freeze-thaw cycles cause the roof-facing masonry to expand faster than the cold street side, creating cumulative eccentric pressure that tilts the wall toward the street.

Question 10

What causes window lintels to crack the surrounding brickwork?

Accepted Answer

When steel lintels over windows rust without protection, rust jacking expands their volume by up to ten times, lifting masonry above into diagonal stair-step cracks. We replace rusted lintels with galvanized or stainless steel units.

Chimney Caps & Rebuilds