ABSTRACT
The term 'natural building materials' describes a whole group of innovative, high-performance construction materials and systems that have a series of advantages when delivering low carbon, energy efficient homes. These materials tend to have less embodied carbon than traditional materials such as brick, concrete and steel, and some have other advantages such as being hygroscopic – an ability to regulate humidity and indoor air quality. This chapter explores how they can be detailed to deliver energy efficient homes, and examines the following range of natural materials: clay blocks, hempcrete, rammed earth, cork, and straw. Each construction type has advantages, disadvantages and recommendations, which are set out alongside the illustrations. The chapter focuses on the structural system for each construction type, rather than cladding and finishes that can change depending on context. After outlining each system, it presents typical details for straw panel construction.
