Tag: Energy Efficiency

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This is a Passivhaus Basics blog post that gives an overview of a specific aspect of the Passivhaus Standard.

The Passivhaus Standard requires airtight construction. What does this mean?

Essentially it means a draught-free building envelope.

A clear airtightness strategy is required to achieve this. The airtight line needs to be continuous even when formed of different materials. And it needs to be joined up, even where there are penetrations.

Sometimes airtight construction gets confused with how a building is ventilated or with ‘breathing construction.’ This post clears up these particular confusions.

And why does the Passivhaus Standard require airtight construction?

Airtight construction is draught-free construction. It is an essential part of the Passivhaus Standard to protect the building envelope, to ensure radical energy efficiency and to provide exceptional comfort.

030 What is Airtight Construction
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A passivhaus home in almost all climates across the world will include a mechanical ventilation system with heat recovery (MVHR*). This kind of ventilation system is required for both energy efficiency and for comfort. However, to many people this is an intimidating and misunderstood aspect of passivhaus. As a result, there are various concerns and misconceptions about what a passivhaus ventilation system is and how you use it.

To address some of these issues I have enlisted the help of Zehnder, a global supplier of Passivhaus Certified ventilation systems. In this post, we explore the following aspects of a residential passivhaus ventilation system:

  1. How do I control the ventilation system?
  2. What day-to-day interaction do I need to have with the ventilation system?
  3. What is the boost function and when should I use it?
  4. When should I switch the ventilation system off?

Rupert Kazlauciunas, Senior Technical Advisor at Zehnder Group UK, very kindly provided answers to my questions

In a residential passivhaus, the ventilation system can be simple to use. It will save energy and money, while ensuring comfort and excellent indoor air quality.

029 Residential Passivhaus Ventilation System
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This is a Passivhaus Basics blog post that gives an overview of a specific aspect of the Passivhaus Standard.

In passivhaus design and construction, there are frequent references to the “building envelope” and the “thermal envelope.” Neither are exclusive to the Passivhaus Standard, but both are important aspects of the standard.

A building envelope is the physical separators between the conditioned and unconditioned environment of a building including the resistance to air, water, heat, light, and noise transfer. The three basic elements of a building envelope area weather barrier, air barrier, and thermal barrier. [Wikipedia]

In simple terms, this means that the building envelope is made up of the walls, floors, roofs (or ceilings), windows and doors that separate the inside from the outside. The passivhaus building envelope is also made up of these elements, but there are some key aspects that make the passivhaus building envelope distinct.

The passivhaus building envelope requires a high-performance thermal envelope, it must be continuous and it is key to the fabric first approach.

028 What is the Passivhaus Building Envelope
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This is a Passivhaus Basics blog post that gives an overview of the Passivhaus Standard. Want to watch a 2-minute overview first? Jump to the video at the bottom

The Passivhaus Standard is often referred to as “the world‘s leading standard in energy efficient design.” And usually a description of the standard includes details of the specific technical requirements. (If you are curious about the technical requirements, I cover the key elements in this post.)

The Passivhaus Standard is indeed an international, rigorous, scientific, performance standard for the design and construction of energy efficient buildings. It applies to all kinds of buildings, not just houses. However, the Passivhaus Standard is not just about the technical requirements of energy efficient design, it encompasses:

  • Comfort
  • Energy Efficiency, and
  • Quality Assurance

It is the combination of these three key aspects that make the Passivhaus Standard what it is.

What do Comfort, Energy Efficiency and Quality Assurance mean in practical terms for a house that is certified to the Passivhaus Standard?

026 What is the Passivhaus Standard
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This blog post is a review of “Passive House Design – Planning and design of energy-efficient buildings” published in September 2014. Author and architect Roberto Gonzalo (who also wrote the 2012 title “Energy-Efficient Architecture”) and passivhaus architect Rainer Vallentin collaborated on this valuable guide for architects and designers.

This is a timely book as the delivery of passivhaus architecture accelerates around the world. As the authors note, more and more architects are finding their way to passivhaus:

…simply because it is one of the most scientifically sophisticated and practical energy efficiency standards for buildings currently available.

Thorough introductory and background material is provided for those that are new to the Passivhaus Standard. This is followed by chapters dealing with a range of subjects in suitable detail for those already familiar with the standard. Well-illustrated case studies complement both the introductory and the more advanced content.

“Passive House Design” is an extremely useful book full of beautiful photographs, clear diagrams and detailed drawings. It maintains the very high standard of presentation and technical detail that can be found in all Detail magazines and books.

Passivhaus architecture depends on the design and construction quality of the building envelope. This book guides you in designing the building envelope.

023 Passive House Design building envelope
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