The project complex located in Queens-NY houses three six-story tall buildings; requiring three typical architraves to be restored. Back in 2016, M+S began working on the replacement of the architrave that presented the most signs of movement.
The replacement of the architrave precast and cast in place concrete segments was recommended due to signs of movement and dislodging.
Movement along vertical panels and spalling along the bottom edge was noted during our initial visit.
Upon review of the existing architrave roofing (see below) it was clear that moisture infiltration had exacerbated the deterioration of the concrete panels below. The existing roof system had open/unsealed joints, insufficient pitch and improper termination along the building’s façade brick wall.
Investigatory probes (see photos below) were carefully conducted to determine anchorage system to the main spandrel beam and evaluate conditions of existing structure. All panels were re-secured and waterproofed upon review by M+S.
Due to the location of the dislodging segments, the installation of protection (scaffold shed) and removal of the existing panels was expedited. The sidewalk shed was necessary to keep safety and use of the main entrance active during construction.
Upon careful removal of the existing concrete segments; the existing spandrel steel beam was scraped, primed, painted, waterproofed and protected with new brick units. Wall ties were welded along the web section of the spandrel beam in order to secure the new masonry and comply with code regulations/industry standards (see progress photos below).
A new steel framed structure was designed by our structural engineers based on the dead loads, wind loads, and loads applied by the new GFRC panels. The new GFRC segments were manufactured by DeNotto Precast Inc.
The panels were manufactured using Glass Fiber Reinforced Concrete (GFRC) in order to reduce the weight of the architrave cladding. The new panels were approximately 1.25" thick; while the original panels were 4" thick.
See GFRC panels and installation in progress below.
The GFRC segment joints were carefully sealed using backer rod, primer and caulking manufactured by Sika Corporation U.S.
Upon installation; the new GFRC and the existing pier panels were coated and sealed.
A new built-in gutter was installed along the top section of the architrave. The copper gutter was waterproofed using a fluid applied system manufactured by Suprema Commercial Roofing (see below). The new built in gutter allowed proper drainage to the side gutters and also the full presentation of the new architrave crown segments.
The new downspouts along the sides of the entrance were extended away from the building walls to prevent moisture intrusion to the basement walls below the entrance.
The entrance ceiling was also replaced and two recessed lights were added to improve exterior lighting.
68 34th Street, Suite B541 | Mailbox 37
Brooklyn, New York 11232
Copyright 2015 M+S Architecture