Wereham Village Hall

Support for the airtightness and vapour control of the Wereham Village Hall Passive House Project.

The Passive House standard has a strenuous target of an air change rate of below 0.6. With thoughtful design by the architects Parsons & Whittley and careful installation by the contractors Walker Construction, as well as the support of Passive House Systems Ltd, a final airtightness test of Wereham Village Hall revealed an exceptional air change rate of 0.33ACH.

Passive House Systems Ltd have supported the design & construction of the airtightness with training and technical support from the beginning to the end of the project.

wareham village hall

Passive House Systems – registered training providers with Engineers Ireland and our training counts towards structured CPD with different organisations.

Our construction consultant & airtightness installer training instructor, Jason Healy, carried out our full day CPD training with Walker construction, covering the importance of a continuous airtight & vapour control layer, selecting the appropriate material for the situation and correct application.

The training covered the theory of airtightness as well as a practical application. It concluded with a review of the construction drawings of the village hall. Furthermore – it opened a discussion about its specific airtightness requirements.

Site managers, installers, foremen, electricians, plumbers and surveyors. Many individuals in a variety of roles attended the training.

Jason Healy commented:

“People would assume that the airtightness training would only benefit installers but this isn’t the case. For airtightness effectivity, it also has to be designed, specified and installed correctly. It also needs proper maintenance and repairs if damaged throughout construction such as penetrating the airtight layer with services. Achieving high levels of airtightness can be difficult. Having the entire design and construction team working towards that goal is essential”.

Walker Construction stated:

“Passive House Systems team showed the highest level of expertise from the initial meetings. They showed us the products and discussed their advantages. Free training session was provided for the operatives installing the products. Their sales team provided next day deliveries, knowledge of the products and safety data information. All of this has aided us throughout the project.”

The project Architect, Chris Parsons noted:

“Walker construction seemed to have a good grasp of the materials and techniques by the time we got to site”.

Passive House Systems Ltd’s Architectural Technologist, Martin O’Keeffe, carried out a thorough analysis of the airtight layer from the construction drawings, highlighting potential problems, offered solutions and created a bespoke & complete airtight and vapour control design for the project.

Martin commented:

“The design of the AVCL (Airtight Vapour Control Layer) was very complete and effective, I review many construction drawings with poorly specified or ill conceived airtight designs but it was clear that Parsons & Whittley incorporated airtightness into their design from the very beginning and required only minor alterations”

Test engineer Vince May from Anglia Air Testing, carried out the airtightness test. The final test result achieved an air permeability (AP50) of 0.27m3.h.m2, over 35 times more efficient than the regulation standard of 10m3.h.m2. Achieved air change rate (ACH50) of 0.33ach, determines almost half of the leading Passive House Standard of 0.6ach.

This Wereham Village Hall project is an excellent example of the airtightness that can be achieved with the appropriate designers & builders as well as the correct materials & technical support.


We’re pleased to have been a part of this project and look forward to working with Parsons & Whittley and Walker construction in the future.