Nehil · Sivak, P.C. was founded in 1991 by Thomas E. Nehil, P.E. and Jerome A. Sivak, P.E. We bring over fifty years of combined experience in structural engineering to bear on our projects.


We are active members of the Precast Concrete Institute (PCI), the Post-Tensioning Institute (PTI), the American Society of Civil Engineers (ASCE), the Association for Preservation Technology (APT), National Trust for Historic Preservation (NTHP), the American Concrete Institute (ACI) and the Timber Framers Guild (TFG). Mr. Nehil serves on the Prestressed Concrete Committee of ACI, where he was principal author of the report on "Corrosion of Unbonded Single Strand Post-Tensioning;" the Parking Structure Committee, where he is active in developing the new parking structure design standard manual; and the Strength Evaluation of Existing Buildings Committee, where he is subcommittee chair working on revisions to Chapter 20 of the Concrete Building Code regarding strength evaluation. He also co-chairs the Technical Activities Committee of the Timber Frame Engineering Council at the TFG.

We have found our structural engineering skills combined with our knowledge of durability problems in masonry, steel, concrete and wood structures provide us with powerful tools for providing durable designs for new buildings and identifying and addressing the causes of problems in existing buildings.


We provide structural engineering design services to architects, developers, contractors and industrial clients for new construction of residential, commercial, educational and industrial facilities. We are knowledgeable in the design of steel, concrete, masonry and timber systems.

We provide engineering design and shop drawing preparation services to precast concrete producers for architectural and structural precast concrete systems.

We provide engineering design services to traditional heavy timber frame producers. We design the timber structural system, all-wood joinery or metal connections, the lateral bracing or shear wall systems, and the foundations.

We provide consulting engineering services for evaluation, modification and repair of existing structures. These include paper plants, food processing plants, warehouses, hospitals, university and school buildings, churches, office buildings, hotels, apartment buildings, facades, supported plazas, parking structures, and stadiums. We have performed numerous investigations of older structural systems to determine load carrying capacity and to develop renovation or adaptive reuse construction documents. These have often included buildings for which no design drawings were available and in which structural systems and materials were used which are now obsolete.

We provide investigations of masonry and concrete facade problems. Buildings we have evaluated have ranged in age from five to 150 years.

We provide expert service consulting to attorneys to assist with dispute resolution in cases where our expertise is appropriate.