By William Stanwix, Alex Sparrow
Hempcrete is a construction fabric with first-class homes. it truly is made of lime and hemp shivs (a waste product from hemp fiber growing); it may be used for partitions, flooring, and for roof insulation; it truly is breathable, soaking up and emitting moisture to manage inner humidity and keep away from trapped moisture and mildew development; it presents first-class acoustic and thermal insulation and thermal mass; it truly is light-weight and reduces building expenditures; and it is environmentally friendly-it locks up CO2 for the lifetime of the construction, and the hemp does not require agrochemicals or pesticides in its cultivation. Read more...
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Additional info for The Hempcrete Book : Designing and Building with Hemp-Lime
Hemp spraying machine. containing pieces longer than 20mm was found to block the hose on the spraying machine. The hemp and binder slurry are mixed together at the nozzle of the sprayer. Due to the force with which it is projected out of the nozzle, sprayapplied hempcrete adheres firmly to the surface on to which it is sprayed. Usually this surface is a permanent internal shuttering board, from which the hempcrete is gradually built out to the desired wall thickness in several passes. There is no need for a shuttering board on the other face of the wall – all that is required is the skill to build up a flat wall.
Most highly efficient insulation materials are responsible for very high carbon emissions in their manufacturing process, and in many cases are made from the very carbon-based petrochemicals the use of which we are trying to limit. In addition, these materials are often made many thousands of miles away from the location in which they are used, and are therefore respon sible for significant fuel use in their transport. 55 The Hempcrete Book: Chapter 4: Key concepts in sustainable building To properly assess a material’s embodied energy means conducting a thorough LCA of the carbon emissions associated with it at every stage during its life.
It was the desire to create a cement with a similar grey colour to that of many stones that was the driving force behind the first innovation in artificial cements. The most significant development was the patenting of Portland cement, by Joseph Aspdin, a Leeds bricklayer, in 1824. Portland cement is formed by the burning of specific quantities of limestone and clay-containing materials at very high temperatures. Since it has many of the same setting properties as natural cements, it took a Significantly, in contrast to those made from lime, mortars and renders made from Portland cement have very little permeability to moisture vapour.