Client Location: Jericho, NY
Project Focus: Structural Crack Repair, Chimney Waterproofing, and Oil Line Sealing

Overview

When a homeowner in Jericho, NY discovered cracks in their boiler room and along the chimney wall, they contacted Zavza Seal LLC to deliver a robust and lasting solution. The structural issues, if left untreated, had the potential to worsen with seasonal shifts and moisture intrusion. Our team promptly assessed the damage and executed a multi-phase, high-strength waterproofing and structural repair project both inside and outside the home.

Client Concerns

• Visible structural cracks in the boiler room and chimney exterior.
• Deterioration around the chimney duct sealed with outdated furnace cement.
• Potential moisture infiltration at the oil line wall penetration.
• Long-term concerns over foundation stability and energy efficiency due to leaks and poor sealing.

Scope of Work

Our certified waterproofing specialists designed a comprehensive repair plan using 7,050 PSI waterproofing cement, fiberglass mesh, and liquid rubber for maximum durability.

1. Boiler Room Chimney Duct Repair

• Removed deteriorated furnace cement around the chimney duct.
• Filled the exposed voids with high-strength cement.
• Applied 7,050 PSI waterproofing cement to reinforce and seal the surface.
• Installed 4.5 oz fiberglass mesh to add flexibility and crack resistance.
• Finalized with a second coat of waterproofing cement, ensuring a secure, watertight finish.

2. Structural Crack Inside Boiler Room

• Chased and thoroughly cleaned the full length of the structural crack.
• Applied 7,050 PSI waterproofing cement as the base repair material.
• Installed a layer of 4.5 oz fiberglass mesh to reinforce the crack zone.
• Finished with another coat of waterproofing cement, locking in the repair for long-term structural integrity.

3. Oil Line Wall Penetration Repair

• Cleaned the area around the oil line to prepare for proper sealing.
• Sealed with two coats of 7,050 PSI waterproofing cement, sandwiching fiberglass mesh for durability and pressure flexibility.

4. Exterior Chimney Crack Waterproofing

Note: All work was completed from the exterior.

• Excavated along the chimney to access the visible crack (Exhibit A).
• Cleaned the structural crack thoroughly.
• Repaired the crack using two layers of 7,050 PSI waterproofing cement with fiberglass mesh between them.
• Applied a coating of liquid rubber for added moisture resistance.
• Installed a delta membrane to shield the area from future water penetration.
• Backfilled to the original grade, restoring the exterior to its prior condition.

Challenges Addressed

• Multi-surface sealing: Our team successfully treated cracks across concrete, masonry, and mechanical penetrations.
• Interior + exterior coordination: Repairs had to be precisely timed to avoid weather delays and ensure continuity between indoor and outdoor fixes.
• Durability & compliance: Only industrial-grade materials—including 7,050 PSI cement and fiberglass mesh—were used to ensure code-compliance and long-term protection.

Results

✅ All structural cracks sealed to prevent further foundation degradation.
✅ Chimney duct area fully reinforced with new cement and waterproofing agents.
✅ Oil line penetration sealed to prevent moisture and air leakage.
✅ Exterior chimney crack waterproofed and membrane-protected for lasting durability.
✅ Client peace of mind restored with clear communication and visible repair results.

Conclusion

This project in Jericho, NY showcases Zavza Seal LLC’s expertise in structural crack repair, boiler room waterproofing, and chimney restoration. Whether the damage is inside your home or on the exterior, we use advanced materials and proven techniques to protect your property from water damage, energy loss, and structural instability.

Call to Action

Are you noticing cracks in your boiler room, around your chimney, or near utility penetrations?

Trust Zavza Seal LLC, your go-to contractor for waterproofing and structural crack repair in Jericho, NY, and across Long Island, Queens, and Brooklyn.

📞 Call us today for a free estimate or 📩 book an inspection online!