A new shared paper on "Mono-material wood wall: Novel building envelope using subtractive manufacturing of timber profiles to improve thermal performance and airtightness of solid wood construction" has been published in Energy and Buildings.
The paper documents the development of a highly sustainable mono-material wood building system that acts as structure, enclosure and insulation using only timber, achieving compliance with stringent German energy saving standards: No insulation, no glue, no screws, just wood.
Abstract
This research seeks to improve the energy performance of solid-timber building envelopes by introducing air chambers into construction elements to increase thermal insulation values and using all-wood joinery to reduce air permeability. This paper documents the development of a construction system that minimizes non-wood materials to reduce embodied energy and facilitate dismantling and low-impact disposal of building components. The developed system satisfies structural, thermal, and airtightness requirements with a pure wood primary construction system.
Sawing deep slits into solid timber profiles introduces air chambers which reduce thermal conduction across the building envelope. Tabulations demonstrate a potential thermal conductance reduction of over 30%, with measured conductance values confirming calculations. The slits have the added benefit of reducing internal stresses which can cause deformations that reduce energy performance over a building’s lifetime. The construction system implements all-wood joinery to minimize use of glues, binders, and metal fasteners. CNC milling gives the precision necessary to achieve airtightness values within required building norms with minimal use of weatherproofing sealants, tapes, and gaskets. Custom design-to-fabrication software generates unique interlocking component geometries which facilitate an assembly process that results in good building energy performance without specialized installation training for its construction. Results are measured through standard tabulation, physical testing of laboratory samples, and built projects, with two iterations of the system being implemented in full-scale demonstrator buildings.
Congratulations to first author Oliver Bucklin and coauthors Achim Menges (ICD), Felix Amtsberg (ICD), Hans Drexler (Jade University), Angela Rohr (Jade University), Oliver David Krieg (ICD)!
Please find the full open access paper here