The New York City Department of Buildings requires that owners of buildings taller than 6 stories have their buildings’ exterior walls and appurtenances inspected once every 5 years by a qualified Registered Architect or Professional Engineer. The R.A. or P.E. must then file a technical report with the Façade Inspection Safety Program (FISP) of the Department of Buildings.
Scott Henson Architect has performed LL11 compliance inspections and report submissions for over 100 buildings, providing assessment to address necessary and recommended repairs. Properties inspected by Scott Henson Architect range from 20th Century skyscrapers to smaller buildings, some of them landmarked, dispersed throughout the 5 boroughs of New York City.
CitySpire, designed by Helmut Jahn, was the second tallest concrete tower in the world when it was built in 1987. As the tallest mixed-use tower in New York City, the LL11 repair program developed by SHA required careful planning and execution. The scope of work on this 75-story skyscraper included the repair of the curtain wall, stone panels, windows, and structural concrete.
Scott Henson Architect LLC was retained to perform the exterior repairs of this 1961 masonry condominium building, and was responsible for the design of a complete restoration and waterproofing program for 220 concrete balconies that met the board’s maintenance and budgetary goals.
Failed patching from the previous repairs was removed and replaced with a new concrete restoration mortar. The new mortar was custom mixed to match the precise content and strength of the original concrete providing maximum compatibility and adhesion. The existing sleeve-post railings were replaced with new aluminum railings anchored to the slabs using sleek stainless steel pins embedded in the concrete, eliminating their vulnerability to water intrusion and corrosion.
Finally, the newly repaired concrete slabs were fully enveloped for protection against future cracking. A fleece-reinforced membrane was installed on the balcony decks and a breathable water-repellent mineral coating was applied to the underside of the balconies.
Scott Henson Architect was retained to assess the conditions of this East Village brick and timber-framed building’s roof. After a thorough investigation that included inspections and probes, we were able to determine the origination and causes of ongoing leaks. We have since been hired to address these issues, for which a full roof membrane replacement of the main roof and bulkheads is necessary. The repair program includes the replacement of all perimeter and bulkhead base flashing, penetration flashing, drains, and insulation.
Scott Henson Architect was retained to perform an exterior conditions assessment of the building at 241 Eldridge Street, a condominium originally built in 1900. In addition to determining that the building needed a new roof, new windows, and terra-cotta repairs, it was discovered that the original mortar in the brick masonry walls had almost completely disintegrated, leaving massive cavities filled only with dust. The cost of re-building the walls was prohibitive, so after extensive research, SHA provided the board with an alternative. SHA’s proposal utilized a mortar injection technology never used before in the US but common in Europe. The new mortar was injected into the voids through holes drilled into the brickwork, stabilizing the wall from the inside out. The contractor worked for two months drilling the 1435 holes necessary to pump 128 gallons of mortar into the deteriorated walls, saving the condominium both the time and exorbitant cost of reconstruction. The restoration was a success and was featured in the New York Times as well as Habitat Magazine.
This building is located between Grand Street and Broome Street in the SoHo Cast Iron District. It was designed by architect J. Morgan Slade for retail use and was completed in 1882. The neo-Grec style street façade is composed of painted cast iron detailing.
We were contracted to perform a full exterior inspection and restoration plan under special agreement with the NYC Landmarks Preservation Commission.
These two ten-story brick and terra cotta buildings have undergone exterior restoration as part of the New York City LL11 repair program. The buildings, built in 1912 and 1913, are located in Morningside Heights and serve as residences for Columbia University.
The scope of work included exterior masonry repairs, structural steel repairs, sill and lintel replacement, limestone and terra cotta restoration, and corner reconstruction.
This building dates from 1860 and is built primarily in stone and utilizes the same round-arched Italianate detailing that appears on early cast-iron facades. It is located in the SoHo Cast-Iron Historic District. It was masonry buildings such as this, in fact, that inspired many of the first prefabricated cast-iron facades.
We were retained to perform the exterior restoration as well as sidewalk vault and light repairs, and the renovation of the storefront bulkhead and entrance, all in compliance with the Landmarks Preservation Commission. The sidewalk vault and cast-iron sidewalk lights were repaired and restored to enable future use. The owner of the building wanted to conserve the neglected and weathered appearance of the building’s façade. Accordingly, all interventions to the building were very subtle.
The Mercantile Building is an art deco skyscraper designed by the New York architectural firm of Ludlow and Peabody.
When it was completed in 1929 the 48-story tower was the fourth tallest building in the world. The building’s original owner was Frederick William Vanderbilt.
SHA directed a full exterior restoration program which included terra cotta repairs, the restoration of the copper mansard roof, the installation of a new roof membrane, masonry repairs, and a window replacement program.
We are currently working on the exterior restoration program at the 900 Grand Concourse. Located in the Grand Concourse Historic District near Yankee Stadium, the building was originally constructed as a hotel whose notable guests included Babe Ruth and Mickey Mantle and is currently programmed for senior housing.
The present restoration includes reconstruction of the original brickwork, terra-cotta urns and stone repairs, reconstruction of the masonry parapets and new roofing membrane. The project is currently under construction and completion is scheduled for Fall 2017.