ENERGY EFFICIENCY OF TIMBER HOMES PRESENTED BY: WERNER SLABBERT
WHAT IS A TIMBER HOME?
WHAT IS A TIMBER HOME?
Energy Efficiency Definitions. How to apply energy efficiency? Comparing Energy Efficiency in Homes? World Wide Trends. Carbon Footprint Definitions. The Carbon Footprint Story. Comparing Carbon Footprint of Different Materials.
Energy Efficiency Definitions
ENERGY EFFICIENCY DEFINITIONS. What is Energy Efficiency? “Is simply the process of doing more with less to accomplish the same tasks and functions as before while using less energy”.
ENERGY EFFICIENCY DEFINITIONS. What is R-Value? Measurement of the thermal resistance of a material. The HIGHER the R-Value, of a material, the GREATER its insulating effectiveness. Around most of the world, R-values are given in SI units(physical units), typically square-meter kelvin per watt or (m 2 · K/W)
ENERGY EFFICIENCY DEFINITIONS. How we calculate heat loss? To find the heat loss per square meter, simply divide the temperature difference by the R-Value. i.e.: If the interior of a home is at 20 °C, and the roof cavity is at 10 °C, the temperature difference is 10 C° (= 10 K difference). Assuming a ceiling is insulated to an R–Value of 2 (R = 2.0 m 2 K/W), the energy will be lost at a rate of 10 K/ 2 K · m 2 /W = 5 watts/per hr for every square meter of ceiling.
ENERGY EFFICIENCY DEFINITIONS. For the exact same temperature difference but with insulation of an R-Value of 1 the calculation will be as follows : If the interior of a home is at 20 °C, and the roof cavity is at 10 °C, the temperature difference is 10 C° (= 10 K difference). Assuming a ceiling is insulated to an R–Value of 1 (R = 1.0 m 2 K/W), the energy will be lost at a rate of 10 K/1 K · m 2 /W = 10 watts/per hr for every square meter of ceiling.
HOW TO APPLY ENERGY EFFICIENCY IN YOUR HOME. Energy Loss without Insulation: ≈ 25% Roof ≈ 25% Roof Summer Summer ≈ 15% Air ≈ 15% Air renewal renewal Principle of Principle of insulation insulation Walls Walls Glazing Glazing ≈ 30% ≈ 30% ≈ 10% ≈ 10% Thermal Thermal Winter Winter bridges bridges Floor Floor ≈ 10% ≈ 10% ≈ 10% Ground ≈ 10% Ground
HOW TO APPLY ENERGY EFFICIENCY IN YOUR HOME. So what do we use?
HOW TO APPLY ENERGY EFFICIENCY IN YOUR HOME. Roof Insulation :
HOW TO APPLY ENERGY EFFICIENCY IN YOUR HOME. Floor Insulation in a Timber Frame Home :
HOW TO APPLY ENERGY EFFICIENCY IN YOUR HOME. Cavity Timber Frame Wall Insulation :
HOW TO APPLY ENERGY EFFICIENCY IN YOUR HOME. Building Envelope Sealing :
HOW TO APPLY ENERGY EFFICIENCY IN YOUR HOME. Window Insulation :
LET’S COMPARE DIFFERENT HOMES. BRICK & MORTAR HOMES vs TIMBER FRAME HOMES
WORLD WIDE TRENDS
WORLD WIDE TRENDS: • “Timber frame is expected to account for 27% of new housing in the UK by 2017, according to a new report.” REF: http://www.structuraltimberawards.co.uk/news/timber-frame-heading-for-27-new-housing-market- share/ • “ Back into the woods: global construction trends show that people are returning to wooden houses .” REF: Ideologist and creator of Dores Factory Egons Garklavs tells his recent observations in global construction trends that people are returning to wooden houses. • “The quarterly European Architectural Barometer survey of 1,200 architects across six European nations showed most architects expect the use of timber frames to increase dramatically over the next five years due to the implementation of energy audits and green star ratings.” REF : http://www.building.co.uk/timber-frame-building-set-to-increase-say-architects/5041252.article
WORLD WIDE TRENDS: • “Most European countries are strong advocates for the implementation of the Kyoto protocol and thus all new buildings in Europe will undergo an energy audit and be attributed an energy rating, so that buyers have the ability to distinguish energy efficient from energy inefficient buildings. It is estimated that one-third to one-half of all GHG emissions are attributable to building construction and operation costs. REF : UK Timber Frame Association. 1-http://www.timber-frame.org/ 2-http://communiques.gouv.qc.ca/gouvqc/communiques/GPQF/Avril2006/20/c9105.html 3-Ürge-Vorsatz et al. 2007. Appraisal of policy instruments for reducing buildings’ CO2emissions. Building Research and Information. Volume 35. Number 4. July/August 2007. 4-Lowe, Robert. 2007. Editorial: Addressing the challenges of climate change for the built environment. Building Research and Information. Volume 35. Number 4. July/August 2007.
WORLD WIDE TRENDS: • It is a well known fact that in America on average 95% of all new houses are built in Timber Frame. • In Australia an average of 85% of all new homes are Timber Frame. • In New Zealand 87% of all new homes are Timber Frame.
CARBON FOOTPRINT. Its not only about energy efficiency of your home; have you ever asked yourself what the environmental impact was of the material used to build your home?
Carbon Footprint Definitions
CARBON FOOTPRINT DEFINITIONS . What is carbon footprint? Carbon foot printing is a sub-set of a broader measure, the ecological footprint, which itself is a measure of the human demand on the Earth’s ecosystem and compares that demand to the Earth’s ecological capacity to regenerate resources and provide services. Carbon foot printing calculates ‘ the amount of GHG emissions caused by a particular activity or entity’ (British Standards Institution (BSI), 2008). This is commonly also referred to as global warming potential (GWP) and is measured in tonnes (or kilograms) of carbon dioxide equivalent (CO2eq.).
CARBON FOOTPRINT DEFINITIONS. What is embodied energy? Embodied energy is the energy consumed by all of the processes associated with the production of a building, from the mining and processing of natural resources to manufacturing, transport and product delivery.
The Carbon Footprint Story CO² ¡ CO² ¡ CO ² Origin Transport Manufacturing
The Carbon Footprint Story CO² ¡ CO² ¡ CO² ¡ Transport Distribution Transport
The Carbon Footprint Story Timber is a negative carbon footprint building material . For every m ³ of pine at least 1 tonne of carbon is stored in the cellulose of the timber.
LET’S COMPARE DIFFERENT MATERIALS. COMPARING BRICK & MORTAR HOMES TO TIMBER FRAME HOMES – 100m ² REF – timber.net.au, ‘The Australian Timber Database’
LET’S COMPARE DIFFERENT MATERIALS. COMPARING BRICK & STEEL TO TIMBER – 300m ² CONCRETE TIMBER STEEL REF - NZ Wood is a major promotional and development programme to promote New Zealand forests and wood resources to improve our economy, society and our whole way of life.
The Carbon Footprint Story SO HOW MUCH DID YOUR HOME DAMAGE THE EARTH?? CO² ¡ Site
SUSTAINABILITY For every tree that is used 3 new trees are planted in sustainable plantation.
Courtesy of Eco Log Homes
Courtesy of Eco Log Homes
WHY ARE WE NOT SPECIFYING AND BUILDING MORE TIMBER HOMES IN SOUTH AFRICA WHEN THE REST WESTERNISED WORLD IS BUILDING SUSTAINABLE AND ENEGRY EFFICIENT HOMES???????
THANK YOU FOR PARTICIPATING. FOR ANY FURTHER IMFORMATION, YOU ARE WELCOME TO VISIT MY WEBSITE : www.rustichomes.co.za
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