It may be surprising that just these three systems — mechanical, electrical and plumbing (MEP) — can make up as much as 15% of the total environmental footprint of a building's materials. Even more important is the operation of these systems, particularly mechanical and plumbing. In many cases, pipes and ducts are run willy-nilly after a home has been designed. The frequent result: high energy and water bills. These details are examples of how MEP systems must be integrated into a home's design and then installed according to the design for optimal performance.

Up to 40% of a home's heat loss or gain comes through air leakage. To make matters worse, that same air almost always carries moisture with it that can condense as it cools on its way into or out of the house. Then comes mold, rot — ugliness. These details offer solutions to the most common home air leaks. Only performance testing — usually with a blower door or fog machine — can identify the leaks in your buildings, but acting on this collection will address the lion's share of air leaks in most homes.

Further Resources

Blog: Blower Door Basics

Blog: Pinpointing Leaks With a Fog Machine

Video: Blower-Door-Directed Air Sealing