Passive solar design is a very premise on how to use the sun to heat your home in the winter. This fantastic video by Community Rebuilds intern Rebecca Barrett sums up the fundamentals.
It’s so simple, right?
All the houses I build with my company Hartwyn use these design principles.
Largest windows are on the South side and are sheltered from the hot midday summer sun. Thermal mass in the form of earthen floors, clay plasters or rammed earth walls store the heat from the sun. Highly insulating natural fibres keeps the warmth inside to keep you cosy.
Sculpted by hand from a mixture of clay, sand and straw, building houses out of cob is a full mind and body experience; one that requires patience. But these homes are worth the wait!
Building on ancient traditions, today’s timber framers and selective loggers are forging a sustainable future. Visit the people behind some of the most intriguing wooden structures in British Columbia
It seems counterintuitive that a framework packed with straw bales could create such a sturdy home. In fact, the straw acts as a natural vapour permeable insulation that allows these buildings to breathe.
A rammed earth wall is durable, energy efficient, and made from the most abundant material on the planet. Learn how these builders and homeowners applied this ancient technique to create timeless contemporary homes.
**I don’t agree with adding cement to a rammed earth wall. It doesn’t need it, and it actually changes the way the walls handle moisture for the worse while making the walls too rigid. Cement has been added over the years because people don’t understand. It’s such a shame!
We are fundraising to contribute towards the large cost of buying a truck for FTGU to allow them to transport materials for the rebuild of Bandevi School which was destroyed in the 2015 earthquake. Currently, funds which should be getting spent on materials are being spent on transport of materials to the remote building site. Buying this truck will create 3 more jobs and will allow FTGU to continue investing in the Ghumarchowk community for years to come. To raise the money needed, we are offering you the chance to be a part of the school. Making bricks in our brick machines which were hand-built by Nick is a labour intensive, slow process but the bricks are very strong and will hopefully save childrens’ lives in the event of another earthquake. The 6 new classrooms will safely house approximately 450 students. How can you help? Sponsor a brick for £5.00 and be part of something truly amazing. We will spray your name on the brick(s) and send you a photo to show you what you’re supporting. Sponsor more than 50 bricks, and we will put your name on a plaque above the entrance to the school, your legacy will live on forever! Thank you for helping us to help this much deserving community. www.facebook.com/ftguinternational
Below is a quick reference of the benefits of clay plasters!
Environmental benefits of clay plaster
if you make your own base plaster, material can be sourced locally, with lower or no transport costs / emissions
unlike gypsum (and lime, although lime re-absorbs CO2 on setting), no firing required, so lower energy use / emissions
clay doesn’t set chemically like gypsum does – it just dries; so at least for the base coat, if it dries, you can wet it and knock it back up again, which means less waste
no nasty chemicals
Benefits for the building
breathability: clay plasters prevent excess moisture in vulnerable buildings. Clays are hygroscopic – they absorb moisture if humidity is high, hold it without being damaged, and when humidity falls, release moisture back to the air. So they maintain a consistent humidity, and minimise damp, and moulds caused by condensation
gypsum on the other hand absorbs moisture, but it’s not breathable, as it doesn’t let moisture out again, and it gets damaged in the process – it moulds, and / or the plaster can blow, and fall off
clays can be used with / over other breathable materials without taking away their breathability
flexibility: clay is soft and pliable, and can move, like lime, without cracking; it can cope with situations where you get minor movements, and so is excellent in old houses
gypsum on the other hand is not flexible, and cracks with any minor movements
protection of timbers: lime absorbs moisture through capillary action, but with clay, there is a chemical attraction that draws moisture in – and because clay absorbs moisture at a faster rate than lime or timber, it takes moisture away from the timbers of the building, protecting them from damp, mould, rot and insects
plus as clay absorbs moisture, it seals and prevents water from passing right through into the structure of the building. Moisture is held and released when the air around it dries. This is why clay can be used to line a pond – clay allows so much moisture in and then provides a barrier
aesthetic: clay plasters are beautiful in their texture and the way they reflect light, and they have an organic, natural feel.
Health benefits from using clay plaster
clay plasters maintain a consistent relative humidity of around 50-60%, which is beneficial for people with asthma or other respiratory problems, but detrimental to dust mites, which reduces problems associated with allergies
they contain no nasty chemicals, and are able to absorb toxins and thus improve indoor air quality. Of course, you’ll try not to use toxic cleaners or buy toxic househould products, but in this day and age, it’s difficult to avoid toxins completely, and so clay plasters can help
you have to be in a room with a clay plaster to understand how beautiful, sensuous, natural, earthy (add your own epithet here) they are. They just make you feel good
Clayfest 2017, 12-17th June, Lincoln Castle, Lincoln, UK
EBUKI have just announced this years’ Clayfest and conference. This year to be held in Lincoln, home of the ‘mud and stud’ building technique.
Workshops at Clayfest
The workshops cover a broad range of topics taught by the experts in their fields, topics including:
Light-Earth Construction; Clay and Natural Fibre Composites
Earth, earth-lime and hot mixed lime mortars
The Steppe Oven: Food Without Wood
Earth and Fibre: Experiments with Forms and Finishes
Mud and Stud
Cob Workshop, Basics to Mobius Strip
Earth Plasters, Decoration, Colour and Textures..
Earth Building UK & Ireland Conference 2017
Conference this year continues with the theme of Clayfest, building bridges. How do we respect tradition, learn from tradition, teach tradition, adapt tradition to bring a new generation of builders, designers, developers and clients to a better understanding and respect for materials which have almost perfect credentials in the circular economy, cradle to cradle materials which can be used and re-used almost indefinitely. Earth as a material has powerful properties and yet what people too often think of are it’s weaknesses. Other building materials also have weaknesses but have been more successful in projecting their strengths, what can we learn from this and how do we project that knowledge and understanding? Hearing from speakers working in and out of the earth building world we will plot a course to better understanding, better networks, building bridges to better building.
It’s sure to be a great week, hopefully I’ll see you there!