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Hemp lime is a lightweight construction material that can be used for walls, insulation of roofs and floors and as part of timber-framed buildings. It provides very good thermal and acoustic performance, and offers a genuinely zero-carbon contribution to sustainable construction. Hemp masonry is breathable and is able to absorb and emit moisture, leading to much healthier buildings. Comprehensive guidance on using this novel material for housing and low-rise buildings is given for the first time in this book, which is full of practical information on materials, design and construction. It is fully illustrated and includes case studies and design details, and explains how the use of hemp-based material can capture and store carbon dioxide in the fabric of buildings. The guide is the output from a Defra-funded study commissioned by the National Non-Food Crops Centre. CONTENTS
Foreword - Marianne Suhr
1 Introduction
What are zero-carbon buildings? Searching for alternatives. UK government policy. History of hemp building. An outline of hemp lime construction. Methodology of the study. Performance of hemp lime. Supply of materials for construction. Glossary
2 What is hemp construction?
Non-food crops. Hempcrete or hemp lime? Construction of walls. Timber frame. Blockmaking. Finishes and spraying. Renovating existing buildings. Sourcing materials and DIY? Acceptance and accreditation of hemp
3 Case examples of hemp lime buildings
Adnams brewery. Timber frame foundry. Barn conversion. Self-build renovation of bungalow. Two-storey extension. Social housing. Exhibition stand at Ecobuild. Office. Summerhouse. Extension to traditional cottage. WISE Building, CAT
4 Growing hemp for building 5 Building construction techniques
Timber frame construction for walls. Wet or dry construction? Offsite construction. Wall details. Methods of placing. Block construction. Roof construction. Footings and ground floor slabs. Surface finishes. Membranes. Fixings. Renovation and use in historic buildings. Plastering with hemp and lime. Timber frame and hemp model
6 Mixes and materials
Specifying hemp. Specifying lime-based binder. Further notes on lime
7 Durability, moisture, ventilation, indoor air quality and thermal performance
Ventilation. Thermal performance. Continuity of insulation. Thermal mass and comfort. Overall thermal performance. Cavity walls, roofs and floors. Air tightness. Summary 8 Scientific issues related to hemp lime
9 Structures, fire and acoustics
Structures. Structural overview. Future research. Resistance to bending and shear. Time-dependent deformation. Structural performance. Superstructure design. Roofs. Internal walls. Foundations. Site preparation and moisture resistance. Fire regulations. Acoustics regulations
10 Life cycle and carbon sequestration
Initial considerations. Potential tools. What is life cycle assessment? What is embodied carbon? Issues for further consideration. Assessing hemp-based building products. BRE environmental profiles method. Ecopoints score. Embodied energy and embodied carbon. Environmental product declarations. Cement and concrete. Extracts from life cycle analysis carried out in France. Summary
11 Natural products for use in conjunction with hemp lime
Spraying hemp onto permanent shuttering. Using other natural insulations. Other crop-based materials. Related products in more detail
12 The advantages of hemp and lime
Government energy targets for housing and building. Modern methods of construction. Costs. Future development and information sources. Main advantages of hemp construction
References and notes
Appendices.
Resistance to compression and stress-strain properties. Thermal measurements
Useful contacts
Index
Book weight: 430g
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