176 Central Ave, Unit 8, Farmingdale, NY 11735

Estimate #3256

Town/Neighborhood: Farmingdale

Borough/County: Nassau County

Construction Type: Crawl Space and Structural Repair

Category: Waterproofing and Structural Repair

Problem: 

A property in Farmingdale had significant crawl space and structural issues, including a dirt subgrade crawl space in need of encapsulation, a concrete floor crawl space with drainage issues, rim joists requiring insulation, a ceiling needing insulation checks, a structural crack showing signs of detachment, and conduits underneath a staircase that needed securing.

Solution:

Work Area A: Crawlspace with Dirt Subgrade (Approx. 624 sq.ft coverage)

We applied a 20 mil vapor barrier over the floor and walls to encapsulate the entire crawl space. The membrane was mechanically attached and made of 100% virgin polyethylene, reinforced with virgin polyethylene ribbons for superior puncture and tear strength.

Work Area B: Crawlspace with Concrete Floor. Exterior walls (Approx. 65 LF)

We excavated the concrete floor at the wall joint to create a drain trench. We installed a Delta Dimpled Waterproofing Membrane along the foundation wall surface, extending it into a French drain system. Then, we installed a 4” diameter perforated PVC drain pipe, transitioned to the existing sump hole in the crawl space. After conducting water tests, we established a proper sump, and installed new 4,000 PSI concrete to cover the drain trench. We then applied a coating of radon seal per the manufacturer’s instructions.

Work Area C: Rim Joist in both Crawl Spaces. (Approx. 78 LF)

We prepared the rim joist and installed rolls of R-18 closed-cell polyethylene foam with reflective reinforced foil to insulate the rim joists. We hermetically sealed the rim joists with spray foam.

Work Area D: Ceiling throughout both Crawlspaces.

We inspected all insulation and ensured there was insulation throughout the ceiling. We installed pieces of fiberglass insulation as necessary, mechanically attached to the floor joist.

Work Area E: 2 Structural Crack with Signs of Detachment near the Spandrel Beams. (Approx. 7LF)

We cut into the concrete core deep slots perpendicular across the structural crack and filled them with structural Epoxy. We then installed non-corrosive carbon stitches in the slots-filled epoxy and applied a coat of Sika 107 waterproofing cement to cover the entire crack area. We applied 4.5oz reinforced fiber mesh to cover the waterproofing cement while it was still wet and applied a second coat of Sika 107 to complete.

Work Area F: Closet Underneath Staircase (3 through wall conduits).

We cleaned and raked out any foreign materials. We filled the void with high strength mortar mix and applied a coat of Sika 107 waterproofing cement to cover the circumference of the through-wall conduits. We applied 4.5oz reinforced fiber mesh to cover the waterproofing cement while it was still wet and applied a second coat of Sika 107 to complete.