From BREADrev Jan 21, 2021 Thankyou Jeremy for sharing.

A slideshow presentation of how we started building wood-fired rocket ovens for bakers

Build your own barrel oven. The barrel oven – is a do-it-yourself cost effective way to get an oven if you can’t afford to buy one. Made from three barrels and extra pieces of metal. This is a great starter oven.

Contact info Contact info BREADrev WESTERN CAPE, South Africa

• +27 83 299 9809Mobile
• jeremy@breadrev.com

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Oct 20, 2017

Introducing the Walker Stoves Tiny Masonry Cook Stove.  This wood fired stove features a stove top, oven, water heating, and space heating all in a small footprint.  Easy to follow Rocket Stove and Cook Stove plans available here: https://walkerstoves.com/ My Clay/Sand Mortar Mix Recipe: 3 parts dry sharp sand by volume, 1 part dry ground fire clay by volume. Add water to desired consistency.  Thanks Matt for sharing video; Easy to follow Rocket Stove and Cook Stove plans available here:  https://walkerstoves.com/

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Aug 14, 2017

Thanks Paul Weaton - for I have answered the "what is a rocket mass heater?" question hundreds of times.   This is my attempt to make a very short answer.  Sure, there is a hundred times more info .... maybe a thousand times more info ...   but the function of this video is to give a quick idea of what it is.  We start with the idea of a conventional wood stove.  The fire is typically around 1000 degrees F.  Heat is extracted immediately.   Smoke goes up the chimney due to a thermosiphon.  This design has the problem of creosote leading to chimney fires.  So if you insulate the chimney, the chimney gets hot enough that the creosote burns much more often - thus reducing the risk.  But the downside is that more heat leaves the house through the chimney.     We shift the design to insulate the fire box.  With temperature now at 1800 degrees F, the creosote and the smoke are burned.  The exhaust is mostly steam and CO2.  We can now safely extract more heat.   We add a stubby chimney so we can push the exhaust wherever we want.  We add a mass to absorb heat.  That's it.  A rocket mass heater.    And then we add some pictures of pretty rocket mass heaters.    Thanks Paul Weaton for shaing videot

 http://permies.com

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May 1, 2022

A rocket mass heater claims to heat a home with one tenth the wood of a conventional wood stove.  HOW is that possible? Let's start by looking at the label on conventional wood stove.  This label is allowed to have 16 extra percentage points to compensate for some of the heat that goes up the chimney.  So a wood stove that says it is 75% efficient, is actually 59% efficient.  Different testing facilities compete to measure the efficiency of a wood stove, so they work hard to produce numbers better than their competitors.  Legitimately.  They might use especially dry wood, or there could be a little extra air pressure in a test lab - things that could plausibly happen in an optimal home scenario.  So the resulting numbers are higher than if their competitor had done the same test and yet still fall within a space of being legit.  But this means that most people using a 59% efficient wood stove will probably operate it at 20% efficiency on average.  And most people putting a big green log on just before bed with dampers set low might be getting less than 3% efficiency.  And when the fire is down to just embers, the stove might continue to pull heat out of the house, resulting in negative efficiency.  It is pretty easy for a rocket mass heater to compete with 3% efficiency.  And even easier to compete with negative efficiency.  When using a conventional wood stove properly, the law requires an exit temperature of at least 350 degrees.  350 to 600 degrees is the most common.  No matter how efficient the burn is, that's a LOT of heat going outside.    Rocket mass heaters typically test at 93% efficiency.  That is without adding the 16% for going up the chimney.  And the exhaust temperature tends to be 70 to 140 degrees.  Since the mass holds the heat through the night after an efficient burn, people are not attempting to set up an inefficient burn through the night.  Most people shifting from conventional wood stoves to rocket mass heaters report heating their homes with one tenth the wood.  Some people have shifted from modern, super efficient wood stoves that they were using very wisely - and those people report heating with 75% to 80% less wood.  Heat your home with one tenth the wood, one hundredth the smoke and wake up to a warm home.   Safer, cheaper, cleaner, easier and more luxuriant than a conventional wood stove.   Safer, cheaper, cleaner and better for the environment than natural gas or electric heat.  bernal brothers animation https://permies.com/bernal  Thanks Paul Weaton for shaing video

 http://permies.com

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Thanks Respirabuilt for sharing this video Jan 6, 2025

At RespiraBuilt, we specialise in creating innovative hempcrete solutions to shape healthier, more sustainable living environments. Our eco-friendly hemp blocks are designed to revolutionize construction by providing superior insulation, energy efficiency, and carbon-negative benefits.

Link: https://www.respirabuilt.com.au/

We produce a new topic each month so tune in.

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Mar 7, 2025 

Thanks Jeremy for sharing this video: Join me, Jeremy from Environmentarian, as I explore a stunning hempcrete home in Malua Bay, built for resilience and sustainability after the devastating 2019 bushfires. Designed by Kirsty Wulf of Shelter Building Design and built by Jace from JV Building & Contractors, this home showcases innovative fireproofing, thermal efficiency, and sound insulation—all thanks to hempcrete.  

Will Brain from Hempcrete Victoria joins us to discuss the cast-in-place and prefabricated hempcrete block methods used in this build. His company, Respirabuilt, provides affordable prefabricated hemp solutions for fire-prone areas.  

 🌿 Key features of this home: 

✅ Hempcrete walls – fireproof, breathable, and energy-efficient 

✅ Smart design – positioned for natural light and thermal mass benefits 

✅ Bushfire resilience – non-combustible materials and ember-proofing 

✅ Sustainable living – carbon-sequestering materials and rainwater collection  

 More Hemp Building Resources 

🔗 Hemp Building Directory https://hempbuilding.au

🔗 Environmentarian https://environmentarian.au 

About Jeremy Thomas of www.environmentarian.au  

Jeremy has Business and Building Design Diplomas. 

His most recent start up Environmentarian focuses on morally conscious biz and web dev, a flagship project is the Hemp Building Directory at hempbuilding.au.   

We produce a new topic each month so tune in.

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CSIRO Study Exposes Why Australian Homes Are Leaking Energy (Passive House Fix!) Mar 7, 2025

 #SustainableBuilding #PassiveHouse #Airtightness

Did you know the average Australian home is leaking up to 30 air changes per hour? That means every 40 minutes, all your heated or cooled air is replaced with outdoor air, wasting energy and costing you money!  In this video, I break down the shocking findings from CSIRO’s latest study on airtightness in Australian homes. 

We’ll cover:  

✅ Why air tightness is crucial for energy efficiency & comfort

 ✅ The hidden dangers of poor air sealing (and how it harms your health) ✅ How Australian homes have improved— but still have a long way to go ✅ The Passive House approach & why it reduces energy use by 3x  🔗 Read the CSIRO study here: CSIRO Air Tightness Report 

 🔗 Learn more about Passive House design & our approach: www.borlandarch.com.au

Thanks for sharing.

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Sustainable Building Materials

United Nations • Climate change refers to long-term shifts in temperatures and weather patterns. Human activities have been the main driver of climate change, primarily due to the burning of fossil fuels like coal, oil and gas.

Dec 21, 2024

This webinar explores which building materials are the most sustainable options for your build or renovation. This is part of the “Introduction to Sustainable Building” series presented by energy experts Renew on behalf of Bass Coast Shire Council and South Gippsland Shire Council.

Following the annual Sustainable House Day on Sunday 4 May 2025, the Webinar Series provides an enriching continuation of the conversation around sustainable and energy-efficient homes. These sessions take place online during May, featuring expert panels and speakers addressing key topics in sustainable living. Designed to delve deeper into practical solutions and innovations, the sessions empower homeowners and enthusiasts to make informed decisions for a greener future.https://sustainablehouseday.com/2025-featured-homes/

See other https://sustainablehouseday.com/listing/geoffs-hemp-house/

Geoff’s house is a highly thermally efficient 8.8 star hemp house with exposed slab on ground and slab edge insulation. It uses passive solar design. The main roof faces due north, tilted up at 20 degrees and is designed to take 20KWh of PV panels (it currently has 11KWh installed) and has 1.0m eaves to east and west. There are south facing clearstory windows for summer ventilation plus a heat recovery ventilation system. All external windows and doors are double glazed with FSC hardwood frames.Designed by Earlx2 Architechture📷This house achieved a NatHERS rating of 8.8 stars using NatHERS accredited software (BERSPro). Find out how the star ratings work on the Nationwide House Energy Rating Scheme (NatHERS) website.

ENERGY AND WATER EFFICIENT FEATURES SUSTAINABLE & RECYCLED MATERIALS INSULATION SPECIFICATIONS RENEWABLE ENERGY SPECIFICATIONS COSTS AND COST SAVINGS HOUSE DESIGN SPECIFICATIONS GARDEN AND WASTE REDUCTION HEALTHY HOME FEATURES

📷

Following the annual Sustainable House Day on Sunday 4 May 2025, the Webinar Series provides an enriching continuation of the conversation around sustainable and energy-efficient homes. These sessions take place online during May, featuring expert panels and speakers addressing key topics in sustainable living. Designed to delve deeper into practical solutions and innovations, the sessions empower homeowners and enthusiasts to make informed decisions for a greener future.

Each week focuses on a distinct aspect of sustainability, offering in-depth discussions and Q&A opportunities. Past topics have included:

• Design and Planning: Steps for creating functional, sustainable home designs.
• Building Materials: Insights on reducing embedded carbon and choosing eco-friendly materials.
• Heating and Cooling: Principles of passive solar design and optimizing energy efficiency.
• Technology for Sustainability: Transitioning to all-electric systems and selecting the right solar solutions.

Sessions are hosted via Zoom and typically feature a mix of experts, sustainable builders, and homeowners sharing firsthand experiences. Recordings are made available afterward, ensuring accessibility for those who may have missed the live discussions.

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Jun 28, 2021

In the summer I leave the wood feed for the rocket mass heater wide open.  In the day, I keep the windows closed, and during the night I keep the windows open.    At night, the temperature outside is a little colder than the temperature inside.   Since the temperature in the barrel is all about the same, the “p-trap” action is disabled.   The warmer air in the vertical exhaust moves up and outside.   This pulls air in through the wood feed, past the barrel, through the mass and out the roof.  Air is moving, slowly, through the whole system.  As dawn approaches, the mass has been cooled a bit - pretty close to the coldest point at dawn.    During the day, the temperature outside is warmer than inside.   A cold plug happens.   Air no longer moves through the system.    At the hottest point of the day, people tend to gather near the rocket mass heater since it is now the coolest part of the house.   The mass feels quite cool.    Doing the thing about opening the windows at night is an old technique that cuts about seven to ten degrees off the hottest part of the day.  I think leaving the wood feed open all the time, cools the room about five to seven degrees more at the hottest part of the day.  Zero electricity - entirely passive.   Video and animation by Bernal Brothers Studio  Music Carmen Suite no. 2 - 2. Habanera (For recorder ensamble - Papalin) Creative Commons. Thanks Paul Weaton for shaing video

 http://permies.com

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