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Exterior Envelopes

Our team of engineers and architects specialize in preventing and solving building envelope problems

We can help you identify and resolve weather-tightness and energy-efficiency issues by inspecting and repairing your building’s façade, roof, foundation, fenestrations and glazing. We provide expert analysis in the assessment and design of all exterior envelope systems for commercial, industrial and high-rise residential buildings. We believe our strategic approach uncovers practical design options that provide flexibility to your financial requirements.

O&S Associates has several New York City Department of Buildings (NYCDOB) Qualified Exterior Wall Inspectors (QEWI) on staff and has filed approximately 500 Façade Inspection Safety Program (FISP) reports in the last two cycles. The FISP reports are required to be filed for all buildings over 6.5 stories high every five years in a staggered cycle. We are experienced in every type of building and wall system, whether historic, contemporary, solid masonry, cavity wall, stone, precast, curtain wall, metal panel, EIFS or a combination; we can help you.

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O&S has been conducting up-close façade inspections since 1996 for public and private entities. We perform this service from swing stage scaffolding, boom lifts, and rope access to examine all exterior wall and façade components.


O&S Associates has designed, investigated, and supervised the installation of thousands of roofing systems nationwide

We are experts in the following roofing systems:

  • Conventional Built Up (BUR)
  • Modified Bitumen
  • EPDM
  • IRMA
  • Green Roofs
  • Metal, Tile, and Shingle Systems

Our specialized infrared photography equipment, traditional exploratory test cuts, and moisture metering can identify even the most difficult to detect roofing problems in order to develop a successful roof repair or replacement strategy.

Industrial Rope Access/SPRAT

O&S has highly trained SPRAT-certified Engineers who can utilize rope access for structural inspections and non-destructive examination to solve vertical access problems in a safe, efficient, and cost effective manner.

Industrial rope access allows O&S to provide comprehensive, hands-on façade inspections and assessments at a fraction of the access costs using swing scaffolding or aerial lifts for high- and mid-rise buildings. Additionally, rope access allows for greater efficiency and flexibility in accessing a building’s façade in multiple locations versus traditional access methods which are typically limited to select locations and are time-consuming to install. It is also a great solution for buildings with sloped roof access, limited access to the roof, or buildings with limited surrounding site. If there are points to tie-off on the roof, rope access is a great option.

With O&S’s growing Rope Access Team, who are all practicing Architects and Engineers, we can continue to provide our clients with detailed and cost-effective building envelope assessment options to meet their budgets and needs.