Custom Weatherization LLC

Custom Weatherization LLC is an insulation contractor serving Allentown, Pennsylvania and surrounding communities. The company holds a 4.9-star rating from 19 client reviews, reflecting consistently positive experiences across residential and commercial projects. Founded in 2006, Custom Weatherization has built its reputation on a building-science approach to home performance, offering diagnostic testing alongside installation services. Their team handles projects ranging from attic insulation upgrades to comprehensive air sealing and moisture management.

What distinguishes Custom Weatherization from typical insulation contractors is their diagnostic-first methodology. They employ blower door testing to quantify air leakage and follow ASHRAE standards when assessing combustion appliance safety. Their service menu covers four distinct insulation types: blown-in, spray foam, and injection foam for different cavity configurations, plus heat pump water heaters for energy-efficient domestic hot water. The company also addresses ventilation systematically, installing ridge vents, gable vents, soffit vents, and foundation vents to control moisture throughout building assemblies.

Reviewers describe specific technicians by name who handled their projects. One homeowner recounted that Robert and Otis spray-foamed their two-car garage, noting the application was neat and even with thorough cleanup afterward. Another reviewer mentioned Dylan and Oz insulating crawl spaces, installing a bathroom exhaust fan, and sealing basement areas around doors. A third customer described working with Rob Moux on estimates following a UGI Save Smart program energy audit, with crew members Neil and Omar completing all recommended work and verifying proper functionality of exhaust systems.