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Post by Mark Stephens Architects on Sequencing

Post HERE by YT on Sequencing and how it applies to good construction and Passivhaus delivery

U Value Calculator now available on iOS, Android & Windows phone!

icon_512Finally after months of development and testing, our U value calculator app UValue is released on Apple iOS as well as Android and Windows Phone.





Below are a few screen grabs that show the key features:

• Scalable high resolution graphics for all phones and tablets

• Ability to enter your own materials, thicknesses and conductivities as opposed to searching in scrolling lists

• Calculates for floors, walls, roofs and ceilings and adjusts the interior and exterior thermal resistance values accordingly (in accordance with DIN EN 6946 Section 5, Chart 1.)

• Available on Android, iOS & Windows Phones

• Includes settings for underground wall, rain screen or warm/cold roof constructions

• Information/settings screen

• Ability to reset all values or delete individual lines

• Adheres to Passivhaus methodology of calculating U values (excluding thermal bridging – see below)

• Links to TeachPassiv.com and additional Passivhus resources, news & FACT SHEETS

• This version totally free of charge

Screen grab showing main screen with unfilled data

Screen grab showing main screen with unfilled data

Screengrab showing main screen with data entered & resultant calculation

Screengrab showing main screen with data entered & resultant calculation

Screen grab of settings/information screen

Screen grab of settings/information screen

Why did we create the app? I was looking for a simple U value app that gave the ability of quickly entering data, allowed a quick comparison between different constructions/insulation and supplemented the PHPP U value calculations (the app is not intended to replace PHPP). I found that the app didn’t exist and we (myself and my coding maestro son Conor) decided to fill the gap in the market.

The app is free of charge and is used as a marketing aid for TeachPassiv.com and the architecture and Passivhaus Design Practice Mark Stephens Architects

The app does not currently take account of thermal bridges, this is going to be addressed in a subsequent version.

If you find any bugs or inaccuracies in the app, please do not hesitate to contact us at support@teachpassiv.com

You can read the Privacy Statement regarding the app HERE

The app is not supported or endorsed by the Passivhaus Institute, does not replace the U value calculations in PHPP and is for entertainment purposes only e&oe.

A big shout out to my sons own website who is a Games Coding Guru at GreenCheeseGames.com

Passivhaus Institute announce 2 new certificates to take account of renewables @phplusmag mentioned

The Passive House Institute has announced the launch of two new certification categories, Passive House Plus and Passive House Premium, which recognise on-site renewable energy generation.

Full details in Passive House+ magazine HERE

All 5 posts from @elrondburrell on #LovePH #Passivhaus

Link below to all 5 posts from Elrond Burrell on ‘What do you love most about Passivhaus?’:


New Fact Sheet on #Passivhaus TEAMWORK! added

A new Fact Sheet on Passivhaus TEAMWORK! has been added to the FACT SHEETS section of website

New fact sheet on #Passivhaus sequencing added…

A new Fact Sheet on Passivhaus Sequencing has been added to the FACT SHEETS section of website

New fact sheet on #Passivhaus TEAMWORK! added…

A new Fact Sheet on Passivhaus Sequencing has been added to the FACT SHEETS section of website

Does solar orientation matter? Blog post by @elrondburrell #Passivhaus

Great blog post by Elrond on whether solar orientation matters for Passivhaus:


New #Passivhaus Fact Sheet on Thermal Conductivity & u values added

Here is link to new Fact Sheet on Thermal Conductivity and u values which has also been added to FACT SHEETS section of website.

This Fact sheet is in response to recent confusion over conductivity values.

Great #Passivhaus Comfort post by @ElrondBurrell #LovePH

Great Post by Elrond Burrell on Passivhaus Comfort:

Passivhaus Comfort POST

Sneak peak of new #Passivhaus U-value App

icon_512Below is a sneak peak at the ‘in-development’ screen-grab of the forthcoming Passivhaus U-value App:


We’re in the final stages of testing, all the code is written and is being beta-tested on devices; so far all the calculations for all conditions (where Rse and Rsi are critical) are working OK.

To make sure you receive details on when the app is released (for Apple iOS and Android) subscribe via email in the right hand widget…

Why is the Number of Passivhaus Standard Buildings Increasing via @PassivhausTrust [youtube]

New Passivhaus U-Value Calculator App in development…

icon_512TeachPassiv.com are please to announce the imminent release of a new Passivhaus App for Apple iOS and Android.

The app is a U-value calculator using the Passivhaus methodology; it has been carefully written to ensure that the surface resistance values are in accordance with EN ISO 6946 for all conditions and can also take into account constructions below ground, unheated spaces and compensation for rain screen constructions.

To ensure that you receive details of this imminent release, please follow/subscribe via email (widget on right hand side)…

Passivhaus Masterclass in Scotland: @Mark_J_Siddall @billbutch @PassivhausArch @PassivhausTrust mentioned

The Passivhaus Trust have a Masterclass covering ‘Passivhaus Delivery, ensuring quality and managing risk’ on 5th February 2015.

Full details and book available HERE

Course facilitators include:

• Mark Siddall, LEAP
• Bill Butcher
• Green Building Store and
• Kirsty Maguire

Passivhaus is cheaper than standard build @encraft_uk @Kate_de @phplusmag mentioned

A recent study by Encraft shows that taking into account the whole life cost of a house, Passive House construction is 2-5% lower than traditional construction methods.

CLICK HERE for the article and HERE for the full article.(788kb)

This article concurs with the article posted by Kate de Selincourt last year for Passive House Plus magazine that explains how the perception that Passive House is more expensive has come about.

CLICK HERE for the post & link to article by Kate de Selincourt

It should be remembered that both pieces of research are UK based and that in Ireland (where the Building Regulations are much closer to Passive House standards), the cost saving differential is much greater.

New #Passivhaus Fact sheet added – Passive House Tradesperson course @Target_Zer0 & @passiveacademy mentioned

Passive House TradespersonA new fact Sheet has been added to the FACT SHEETS section of website

Or alternatively CLICK HERE to download the Passive House Tradesperson Fact sheet.

Passive House Tradesperson Courses mentioned in the fact sheet are provided by TargetZero and Passive House Academy

TeachPassiv.com 2014 in review

The WordPress.com stats helper monkeys prepared a 2014 annual report for TeachPassiv.com.

Here's an excerpt:

A San Francisco cable car holds 60 people. This blog was viewed about 3,100 times in 2014. If it were a cable car, it would take about 52 trips to carry that many people.

Click here to see the complete report.

ps A good start and hoping to do a lot more next year, stay tuned…

The Passive House explained in Gingerbread & marshmallows

Image from Treehugger.com © Kasper Diem

Merry Christmas to all and to get you in the festive spirit, CLICK HERE (or on the image) for the Passivhaus methodology explained in gingerbread & marshmallows from Treehugger.com

#Passivhaus Fact Sheet No. 17 – Choosing a Passivhaus Builder @Target_Zer0 @passiveacademy @vikhouse @BePassive mentioned

Fact Sheet No.17 has just been released on ‘How to choose a Passivhaus builder’


This Fact sheet has also been added into the FACT SHEETS section of the website

How Brussels moved from UK style building regs to making #Passivhaus mandatory; Ireland could do same?

I saw this tweet by @MariaSfyraki recently on the Passivhaustrust website outlining how Brussels have moved from a UK style Building Regulations to mandatory Passivhaus. Is this something Ireland should consider?

Click HERE to open the document

6 posts on Part L, #ThermalModelling #BRegs & #Passivhaus @BRegsBlog mentioned

The following 6 posts are on who should certify Part L compliance, the BER Assessor? Part L compliance with the Building Regulations with regards to Thermal Bridges/Modelling and Thermal Bridging and Passivhaus

1. From the Bregs Blog admin team – 3 Things Design Certifiers should know about certifying Part L

2. My opinion piece on the BRegs BlogSI.9 and Part L | Are specialist ancillary certifiers needed? Part 1

3. Follow-up Part 2 opinion piece on the BRegs BlogSI.9 and Part L | Are specialist ancillary certifiers needed? Part 2

4. On MarkStephensArchitects.comThe basics of Part L Thermal Modelling Building Regulation compliance – Part 1

5. On MarkStephensArchitects.comThe basics of Part L Thermal Modelling Building Regulation compliance – Part 2

6. On MarkStephensArchitects.comThe basics of Part L Thermal Modelling Building Regulation compliance & Passivhaus – Part 3

Reminder that a series of Passivhaus Fact Sheets are in the FACT SHEETS section of website and that the above information is specifically related to Ireland and may not apply to other countries.


All advice online is remote from the situation and cannot be relied upon as a defence or support – in and of itself – should legal action be taken. Competent legal and building professionals should be asked to advise in Real Life with rights to inspect and issue reports on the matters at hand.

#Passivhaus Fact Sheet 16 – #PHPP Hitting Airtightness Requirements

This Fact Sheet (below) focusses on Airtightness and it’s relevance in PHPP

Fact Sheet No. 16 – PHPP ‘ Airtightness – Hitting the target’ – Click to download pdf (907Kb)

#Passivhaus Fact Sheet 15 – #PHPP Hitting Primary Energy Requirements

This Fact Sheet on ‘Hitting Primary Energy Requirements in PHPP’ was harder to write than that on Space Heating Demand as there’s a lot of variables concerning frequency of use and energy consumption figures; I have however tried to keep it to the single sheet (in line with all the other FACT SHEETS in the FACT SHEETS section and also to provide information for those new to Passivhaus as well as the more experienced practitioners (who I know read the blog and I welcome any corrections from these highly skilled readers). Link below to Fact Sheet No. 15:

Fact Sheet No. 15 – PHPP ‘ Primary Energy Demand – Hitting the target’ – Click to download pdf (299Kb)

Fact Sheet No.14 – PHPP Hitting Space Heating Demand for #Passivhaus

This new Fact Sheet (also in FACT SHEETS section of website) gives a few methods of hitting (and bettering) the Passivhaus Space Heating Demand requirements. It focusses on alternative strategies that may not be obvious in addition to improving u-values, airtightness etc…

Fact Sheet No. 14 – PHPP ‘Hitting the target (1-5)’ – Click to download pdf (341Kb)

There will be additional Fact sheets covering other PHPP areas in due course, watch this space…

Book now for UK 2014 Passivhaus Conference

Bookings are now being taken for the 2014 UK Passivhaus Conference

Fact Sheet 13 – Passivhaus Cavity closers – openings

Fact Sheet 13, focusses on typical detailing of Passivhaus cavity closers at openings:

Fact Sheet No. 13 – Case Study – Cavity Closers (Openings) – Click to download pdf (493Kb)

Again this is included in the FACT SHEETS section of web site

Fact Sheet 12 – Case study on Cavity Closers: @passivhausnews mentioned

Passivhaus Fact Sheet Number 12 which is the second in the case study series focuses on cavity walls and how they are closed at the eaves:

Fact Sheet No. 12 – Case Study – Cavity Closers – Click to download pdf (566Kb)

This fact sheet is also included in the FACT SHEETS section of the web site

#Passivhaus analysis of integrating timber beams into the airtight layer

Interesting document HERE on how timber beams should be integrated into a Passivhaus airtight construction.

Fact Sheet 11 – Case Study 1: Passivhaus Cavity Wall insulation UK/Ireland

Fact Sheet 11, The first of the Case Studies looks at comparisons & differences to Passivhaus cavity wall insulation between UK and Ireland:

Fact Sheet No. 11 – Case Study – Cavity Wall Insulation – Click to download pdf (334Kb)

Again this is included in the FACT SHEETS section of web site

#Passivhaus Fact Sheet No.10 out on Thermal Bridges

Fact Sheet Number 10 is out on Thermal Bridges:

Fact Sheet No. 10 – Thermal Bridges – Click to download pdf (321Kb)

Again this is included in the FACT SHEETS section of web site

#Passivhaus professionals reach over 4000 in world ! via @phplusmag

If there’s any evidence that Passivhaus is not a fad is that the number of Certified Passivhaus Designers/Consultants (of which Mark Stephens Architects are one) now reaches over 4000 as reported by Passive House + Magazine

For the full article and details CLICK HERE

Fact Sheet No. 9 – Enerphit for Passivhaus retrofitting projects is out!

The latest Passivhaus Fact Sheet (No. 9) on the Passivhaus Enerphit Standard (276Kb) is ready to DOWNLOAD

Again this is included in the FACT SHEETS section of web site

Passivhaus Fact Sheet No. 8 out – Building Certification ( @ElrondBurrell mentioned again!)

Fact Sheet Number 8 on Passivhaus Building Certification is out:

Fact Sheet No. 8 – Building Certification – Click to download pdf (290Kb)

Again this is included in the FACT SHEETS section of web site

Fact Sheet No. 7 on why you need MHVR is out

Fact Sheet No.7 Why MHVR? is out (and also in the Fact Sheets section of website

Excellent post by @ElrondBurrell on why #Passivhaus certification is essential

Excellent post by @ElrondBurrell on why #Passivhaus certification is essential, below:


Fact Sheet No.6 is out – Why do you need triple glazed windows for #Passivhaus? @Green_Books mentioned

Fact sheet No. 6 is out and as promised it’s getting more technical, the sheet refers back to previous posts on this subject on MarkStephensArchitects.com and if you like your physics & maths there are some example calculations given.


Any errors on the maths let me know, I remember there were some discrepancies over location irradiation figures.

This Fact Sheet is also included in the Fact Sheets section of the website

Fact Sheet No.5 Ready – Passivhaus Construction

We’ve added Fact Sheet No.5 on Passivhaus Construction to the FACT SHEETS section.

Now that’s the ‘Fundamentals’ dealt with, it’s time to get technical…

Fact Sheet No.4 on Passivhaus design is out: @ParsonsWhittley @zowark featured

Fact Sheet Number 4 on Passivhaus Design is out, next one will be on Passivhaus construction…


Special thanks to:

Zeno Winkens for
Clauson House Co. Wexford, Winkens Architecture

Isover Energy Efficiency Award 2013 WINNER
Finalist Irish Building and Design Awards Sustainable/Green Project of the Year 2014
Finalist The Green Residential Building Green Awards 2013


Chris Parsons of Parsons + Whittley Architects for the 3 dwellings at Burnham Overy Staithe for Hastoe

You can download the Fact sheet HERE or via the FACT SHEETS section where you can download the previous sheets.

TeachPassiv #Passivhaus Fact Sheet No. 3 out: The Passivhaus Design Team

Fact sheet No. 3 out now: The Passivhaus Design Team

Details who you should appoint and why to build your ultra-low energy Passivhaus.

#Passivhaus Fact Sheet No. 2 out: Common Passivhaus Misconceptions

Fact Sheet Number 2 is out, click on link below & is also added into FACT SHEETS section:

Fact Sheet No. 2 – Common Passivhaus Misconceptions (258Kb)

Fact Sheet No.1 – What is a Passivhaus?

After hearing that I have passed my Certified Passivhaus Consultant/Designer exam; I am now focussing on developing the TeachPassiv website. This starts with a series of ‘Fact Sheets’ on Passivhaus design, methodology & execution. And where best to start is at the beginning with ‘What is a Passivhaus’:



Welcome to a brand new web site developed by Mark Stephens Architects to impart knowledge and information on the design and construction of Passivhaus buildings.

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