The illustrations and explanatory notes in Part 2 of this guide demonstrate the application of the building enclosure functions in high performance retrofit. The assemblies and details illustrated represent configurations commonly found in wood framed New England homes. Part 2 is structured into three sections:
Retrofit Assemblies are the basic building blocks of a retrofit project. They define the basic strategies for major building enclosure components such as roofs, walls, foundation walls, etc. The strategies of the retrofit assemblies selected for a particular project determine the strategies for Transitions between Retrofit Assemblies and for Interruptions to the Retrofit Assemblies.
The illustrations and notes for Transitions between Retrofit Assemblies show how the critical control functions are transferred between major component assemblies. Maintaining continuity of the control function through transitions is essential to performance.
Interruptions to Retrofit Assemblies are building elements, service penetrations, or other "holes" generally occurring in the field of an assembly that pose a challenge to continuity of the control functions. Examples of these interruptions include windows and doors, deck attachments and exhaust ducts. Special attention is needed at interruptions to ensure that control functions are not lost.
Lapses in the control functions, particularly lapses in the water and air control functions, lead to problems.
Throughout the illustrations, Water Control System components, Air Control System components, Vapor Control System components, and Thermal Control System components are clearly designated.