296 Denton Ave, Lynbrook, NY 11563
Estimate #3322
Town/Neighborhood: Lynbrook
Borough/County: Nassau County
Construction Type: Residential
Problem: Foundation A in the property at 296 Denton Ave was under excessive compressive pressure due to improper installation of support columns within the crawl space. This led to the development of structural cracks and issues of settlement.
Solution:
Work Area A: Foundation Wall (Foundation A) Structural Crack
Our team began by relieving the pressure on Foundation A. We cut the concrete, excavated and installed two 12″L x 12″W x 16″H reinforced concrete footings made of high strength 5,000 PSI cement. On these new footings, we installed two four-inch diameter concrete filled steel columns with steel plates on top and bottom. We fabricated a 4” hot rolled steel I-beam with high compressive PSI and installed it on top of the steel columns. We then targeted the crack, using diamond blades to chase it, removing loose, damaged, and foreign materials to expose the bare concrete. Every 12 inches along the crack, we cut deep slots into the cinder block core, filled these slots with structural epoxy, and installed non-corrosive carbon stitches. Each stitch can pull 6,500 pounds, adding structural integrity. A coat of Sika 107 PSI waterproofing cement covered the entire repair area, followed by 4.5 oz reinforced fiber mesh. A second coat of Sika 107 completed the waterproofing process.
Work Area B: Center Beam Settled Area
In this area, we again cut the concrete, excavated, and installed a 12″L x 12″W x 16″H reinforced concrete footing made of high strength 5,000 PSI cement between the two existing steel columns. We then phase jacked the beam a little to the pressure point of deflection. A four-inch diameter concrete filled steel column was installed on the new footing with steel plates on top and bottom.
Work Area C: Cut Beam Near the Laundry Area
We connected a new beam to the existing damaged beam and extended it to the foundation wall. The beam was connected with a special U channel and galvanized structural bolts. We used Simpson Strong tie to attach the beam to the foundation wall. A square was cut in the raised platform to enable us to install a new column to support the new beam. We cut the concrete, excavated, and installed a 12″L x 12″W x 16″H reinforced concrete footing made of high strength 5,000 PSI cement. A four-inch diameter concrete filled steel column was installed on the new footing with steel plates on top and bottom.