Holzraum System
Pennsylvania building-enclosure consultancy specializing in factory-ready timber assemblies and Passive House detailing.
What they're known for
Holzraum's Single Integrated Manufacturing Model coordinates timber structure, enclosure layers and factory instructions; its XP20 assemblies incorporate vapor-open wood-fiber insulation.
Holzraum System works with architects, builders and off-site factories to translate Passive House enclosures into manufacturable timber assemblies. Co-founders Ilka Cassidy and Steve Hessler combine enclosure consulting, digital design-for-manufacture modeling and prefabrication coordination through the firm's Single Integrated Manufacturing Model. Holzraum contributed energy modeling and prefabrication expertise to Red Clay Passive and develops XP20 wood-fiber wall and roof assemblies with independent factory partners.
Capabilities
- Passive House enclosure consulting
- Design for Manufacture and Assembly (DfMA)
- Single Integrated Manufacturing Model coordination
- Factory Ready structural and thermal panel design
- Timber system and moisture Management detailing
- OFF Site fabrication integration and education
Performance focus
- Airtight and vapor Open enclosures
- Wood Fiber enclosure assemblies
- OFF Site Passive House construction
Notable products
We haven't catalogued their full line in the directory yet. These are the entries worth knowing.
- Catalog entry
XP20 Wall and Roof Assemblies
Vapor-open wood-fiber panel assembly system produced through partner factories for low-energy projects
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Sources
Facts verified November 2026. Compound is an independent editorial directory and is not affiliated with this company unless stated.