Princeton Engineering and Solar

Solar, Structural, Electrical and Site Engineering

Civil Site


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iRooF TM

Instant Roof Framing Analysis

Roof Framing Analysis for Rooftop Solar Installations

Use the online iRooF TM data intake form to enter field data and the proposed array on the roof structure.

Even use your tablet or smartphone to submit projects from the field!

For one low fee per project iRooF TM gives you:

  • Error checking on your plan set's framing and electrical designs
  • Review of your plans for structural upgrades, code conformance and electrical design
  • iRooF TM structural engineering report with our Professional Engineer's Seal AND e-Signature
  • Our Professional Engineer's Seal AND e-Signature on your Plan Set
  • Completed standard building permit forms

  • tells you if the roof can support a PV solar installation
  • identifies problems and tells you how to strengthen a weak roof
  • specifies minimum racking lag bolt requirements

Use iRooF TM as a design tool, performing different layout trials to minimize any required supplemental roof structure.


  • The iRooF TM structural engineering report is signed / sealed / eSigned by our licensed Professional Engineers.
  • Your structural AND electrical plans are reviewed then signed / sealed / eSigned by our licensed Professional Engineers.
  • Standard building permit forms are automatically filled in by iRooF TM.
  • We also offer Post Installation document review and certifications.

iRooF TM is used by:

  • Solar Contractors
  • Permitting Teams
  • Licensed Engineers
  • Registered Architects

iRooF TM offers 4 types of structural analysis:
  • Standard Roof Framing
  • Truss Roof Framing
  • Roof Analyses for No-snow Areas
  • Ground Mounts
iRooF TM 's large database of equipment and building materials includes:
  • PV Solar Modules
  • Solar Rack Mounts
  • Roofing Materials
  • Framing Lumber Species

Princeton Engineering offers iRooF TM in 34 states: AL, AZ, CA, CO, CT, DC, DE, FL, GA, IL, IN, LA, MA, MD, MI, MN, MS, NC, NH, NJ, NM, NY, NV, OH, OR, PA, RI, SC, TX, UT, VA, VT, WI and WV. These active licenses are highlighted in orange in the below map. Pending licenses are shown in green.


Princeton Engineering and Solar

35091 Paxson Road
Round Hill, VA  20141
Tel:  540.313.5317
Fax: 877.455.5641

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