HOLZRAUM SYSTEM is a design and consulting partnership combining decades of experience in architectural, structural and heavy timber design, high performance and passive house construction, CADCAM (computer aided manufacturing) for wooden structures and software development for streamlining design and manufacturing processes. Formed as a Passive House consulting and building envelope design to manufacturing firm, HOLZRAUM SYSTEM was based on our commitment to working with builders and architects to achieve unmatched comfort, superb air quality, extreme building resiliency, and among the lowest embodied  + operational carbon footprints in the building envelope industry.


HOLZRAUM SYSTEM  works with architects, engineers, builders and developers and connects them with our manufacturing processes and efficiencies in order to provide building envelope analysis and consulting if needed and the complete integration of project design intent, passive house principals and cost-effective offsite manufacturing.  Holzraum System keeps the envelope design and planning process connected - always maintaining alignment between client, engineering and manufacturing perspectives. As we create a precise and comprehensive single 3d model of your structure we apply our building science training and Wufi static and dynamic software tools, eliminating thermal bridging, achieving superb air-tightness and delivering highly vapor-open moisture profiles in our exterior wall and roof assemblies in order to eliminate risks of mold conditions and assembly decay and assure the safest, healthiest indoor air quality possible. 


HOLZRAUM SYSTEM PERFORMANCE ENVELOPES are built with only wood-based materials allowing nature to deliver extremely high-tech benefits that synthetics just can't touch.

Vapor Open Exterior Insulation

Wood fiber’s natural ability to store and release moisture and its high vapor permeability of 20 perms allows the wall and roof assemblies to provide between 2x and 4x the drying capacity when compared to outside layers for typical plywood or OSB sheathed assemblies.

Health and Indoor Air Quality 

Indoor air quality starts with how the structure is built and what products were used to build it.  Holzraum System's use of only natural and fully breathable layers in our wall and roof assemblies insures that synthetic chemicals are not introduced into the structure and that unhealthy conditions like mold and rot won't develop during occupancy.


Thermal Storage Capacity

Compared with conventional insulation materials like glass wool or foam, wood fiber insulations come with an  especially high density. This creates a phase shift or delay in thermal transfer time through the fabric of the building so that the midday temperatures only reach the internal side when it's already cooler outside. 


Moisture Management | Hygric Buffering 

Holzraum wooden assemblies are completely hygroscopic and can absorb, store, and redistribute water -  acting as a moisture buffer. When the air is very dry, the materials will release moisture into the indoor air (by evaporation). Eliminating low permeability layers like foam insulation allows the movement of excess moisture through the envelope instead of trapping it within the wall or roof assemblies where it can cause problems like mold, rot, and reduced insulating capacity.


Carbon Sequestration = Carbon Smart

Building construction and operation represent a large portion of annual CO2 emissions. Wooden assemblies trap carbon, significantly reducing your project's embodied energy footprint while also reducing operational energy by employing passive house strategies.

Chain of Custody Material Sourcing - PEFC Certified

A critical requirement to delivering our envelope's extremely low carbon footprint is to ensure sustainable material sourcing.  All structural and non-structural framing elements in Holzraum System interior/exterior wall panels, roof panels and floor panels is PEFC certified material.

Reducing Embodied Energy + Operational Energy Demand Is The Answer.  For many years our research and our guts were telling us that focusing solely on reducing operational energy through passive house strategies while ignoring the embodied energy of foam insulation and other synthetic building materials just seemed counter-intuitive.  The more we learned and the more closely we compared wooden assemblies to conventional high performance assemblies the more we realized how right we were.  The fact is that many of the high performance and passive house buildings we have insulated with foam don't look so great in the lens of a 50 year life-cycle...for more info check out this awesome article on

Beyond Energy Efficiency: Why Embodied Carbon In Materials Matters




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