Guides

The Truth is Out There (Window Specifications)

Posted by on Aug 15, 2016 in Guides | Comments Off

The Truth is Out There (Window Specifications)

(Post by Karl and Liam)   Glazing Frame Evidence Required for Passivhaus.pdf (97.9 KiB, 1,071 hits)   Glazing Frame Specifications for Passivhaus.xls (87.0 KiB, 945 hits) In a darkened basement there is a series of files, full of mystery and unanswered questions. The investigations held within these files are frequently hampered by a wall of secrecy which surrounds the subject matter. At every turn there seem to be half-truths and prevarication, with questions being sidestepped or overlooked. However, the investigators aren’t looking for proof of alien abductions, a vast...

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New PHPP Guide: Formulae to Make Solid Shading Transparent

Posted by on Nov 9, 2015 in Guides, news, Of interest | Comments Off

New PHPP Guide: Formulae to Make Solid Shading Transparent

Dear all, We have published a guide to applying a transparency factor to objects in the shading sheet in your PHPP. Let’s say you are modelling a line of trees in your PHPP. The spreadsheet assumes that they are completely opaque, but this isn’t true – some degree of light always gets through. This guide shows you how to apply some transparency to those trees, making your shading more accurate. It is also useful for modelling non-solid fences, brise-soleils and pergolas. Download link:  PHPP Formulae to Make Shading Transparent (220.1 KiB, 1,463 hits) Hope you...

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The new residential TFA rules

Posted by on Jan 7, 2013 in Guides | Comments Off

PHPP Version 7, introduced earlier this year, contains some significant changes with regard to what’s counted as Treated Floor Area (TFA). The UK builds the smallest homes in Europe, and smaller buildings can struggle within the Passivhaus methodology. Unlike the UK convention, where the floor area is taken as everything within the external walls (including partitions and stairs), Passivhaus considers the actual rooms within the home. As the heating energy demand within PHPP is measured per m2 of TFA, a building with a small TFA will generally have proportionally greater heat loss areas...

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10 most common PHPP mistakes

Posted by on Oct 25, 2012 in Guides | Comments Off

WARM have now certified 21 Passivhaus schemes. We like to see the designer’s PHPP as early as possible so we can perform an initial check. Unfortunately this can sometimes be a painful experience as PHPP offers so many ways to make a mistake, and is rarely forgiving when you do. So I thought I’d go through the top 10 most common (and significant) PHPP mistakes. If you have a project you think you’d like certified we’d be happy to quote for an initial PHPP check as part of our standard certification fee. 1. Entering multiple casement windows in one row It’s ok to enter two identical window...

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A guide to Volume Calculations for Passivhaus Air Tightness Testing and the Difference with the UK Method

Posted by on Aug 11, 2011 in Guides | Comments Off

UK Methodology The UK standard measures Air Permeability, in m3/hr/m2@50Pa (the q50 measurement), or in other words the air leakage per square metre of building envelope. The ATTMA (Air Tightness Testing and Measurement Association) TS1 standard defines the building envelope as everything within the air barrier line ‘along the line of the component to be relied upon for air sealing’. This could be anywhere within the building envelope (even the external render). This is a measure of building envelope airtightness. Passivhaus Methodology The Passivhaus standard measures the Air Change Rate...

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