Dawnus, in conjunction with our partners, Architype  and WSP have launched our bespoke approach to Passivhaus School Design and Construction - Patrwm 21.

Our partnership has completed two 21st Century Passivhaus Schools and we have a further three projects at design stage.

It is the intention of our team to expand the model to include other building types such as care facilities, accommodation, offices and visitor centres.

Patrwm 21

Patrwm 21 is the name given to our Passivhaus business model. The name derives from the Welsh word for Pattern (Patrwm); it reflects our pattern book approach to 21st Century School design and construction.

Our model is based on a single integrated team of Design and Construction professionals who work together with our Clients to develop a solution that reflects the individual project objectives. The solution is made bespoke to the site, building size, the material pallet preferred by our Client, and the end user group(s). By applying the same approach to each scheme we are able to predict and guarantee the high quality, sustainable outcomes we will achieve - and the cost.

One Team - One Approach - Bespoke Solutions -  Predictable Outcomes

What is Passivhaus?

Passivhaus is the world’s most rigorous energy and comfort standard,  underpinned by a robust certification process.

Passivhaus reduces energy by good design instead of carbon off-setting, while optimising the internal environment. It combines a few simple parameters
to create a highly efficient design.

We use the Passivhaus Planning Package (PHPP) as a design optimisation tool to achieve the thermal energy target of 15kWh/m2/year.

  • Designing the building form and orientation, to maximise efficiency, utilise solar gain, and prevent overheating.
  • Achieving robust airtightness to reduce heat loss, avoid external air penetration, and prevent condensation risk.
  • Simplifying detailing to eliminate ‘thermal bridges’ and create a robust
    building fabric.
  • Providing continuous fresh air, prewarmed by heat recovered from extract air, through Mechanical Ventilation with Heat Recovery (MVHR).

This approach achieves:

  • a 70-90% Reduction of energy in use
  • significant improvements in indoor air quality

To find out more visit the Patrwm 21 website  www.patrwm21.com and/or download our leaflet here.

Parc Y Tywyn Primary School