Whether it's a question about specifications, code regulations, product usage or installation, the 1-800-NATIONAL Construction Services hotline offers help from these experts:

Jim Farrell

Jim brings over 30 years of construction experience to our 1-800 NATIONAL team, serving as a project manager and GC/owner's representative in various residential and commercial projects, including Class A commercial high and mid-rise construction, healthcare facilities, mixed-use facilities, single-family residential, multifamily and senior living communities. His knowledge brings extensive planning, pre-construction, design, construction and project completion experience to the team. Jim has a degree in Structural Design and Construction Engineering/Construction Management and Electrical Engineering.

Sam Halverson

Sam brings to the 1-800 NATIONAL team more than 20 years of architectural experience developing projects from conception through their final construction for numerous commercial, educational and institutional clients. He has extensive experience related to project schedules, budgets, drawings, permits, bids and specifications. Sam is a member of the systems testing team and the creator of multiple highly-regarded technical resources such as The PURPLE Book®, The SoundBook® and The Wood Book™. He has a Bachelor of Architecture Degree from UNC Charlotte.

Krista Karlson

Krista brings 30 years of architectural expertise to the 1-800-NATIONAL team, specializing in multifamily and civic projects. During her career, she has worked for both large and small architectural firms, developing her proficiency in design and construction of municipal, commercial, residential, higher education and mixed-use projects. Krista is LEED certified and a member of the American Institute of Architects. She holds a Master of Architecture and a Bachelor of Architecture from the Savannah College of Art and Design.