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Exterior Envelopes

Our team of engineers and architects specialize in solving and preventing performance problems associated with the building envelope

We can help you identify and resolve weather-tightness and energy-efficiency issues related to your building’s façade, roof, foundations, 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 the client’s 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 ½ 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.

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 exterior wall and façade components, such as:

  • Brick
  • Concrete
  • Natural Stone
  • Terracotta
  • Masonry
  • Steel Lintels and Shelf Angles
  • Curtain Wall Components
  • Claddings and Fascia
  • Windows and Wall Openings
  • Building Corners and Projections
  • Roof Parapet Walls
  • Cornices and Water Tables
  • Balconies
  • Terraces
  • Canopies
  • Railings
  • Miscellaneous Wall Appurtenances and Attachments

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.