Process information
| Key Data Set Information | |||
| Location | AT | ||
| Reference year | 2024 | ||
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| Use advice for data set | Scope: This EPD is based on a declared unit of 1 m of cross-laminated timber (moisture of 11.5 % at a raw density of 470 kg/m), produced at the Mayr-Melnhof Holz Holding AG production site at Gaishorn (Austria). System boundary: The life cycle assessment of average cross-laminated timber produced by Mayr-Melnhof Holz Holding AG refers to a cradle-to-gate analysis of the environmental impacts with modules C1–C4 and module D (A1–A3 + C + D). The following life cycle phases are part of the analysis: Module A1–A3 | Production stage The production stage includes the upstream burdens of raw material supply, their transports, and the manufacturing plant of Mayr-Melnhof Holz in Gaishorn am See (Austria). Main raw material inputs therefore refer to sawn timber and the production of the adhesive system. Within the plant boundaries the sorting, drying, fingerjointing, pressing and framing as well as the packaging of the product are considered. The production site is supplied with thermal energy from a biomass power plant. Furthermore, electricity is purchased as 100 % green electricity from the external grid. Direct emissions from drying are based on worst-case assumptions and are included in the study. Primary data from adhesive production was used as far as possible. The packaging of the products is considered in module A1–A3 as well. Module C1 | Deconstruction and demolition After the removal of building components overlying the product, the joints can simply be loosened by screwing or sawing and lifted by cranes to the place of removal. Required energy demand can be neglected. The actual energy demand depends on the installation of the products and can therefore vary greatly in the building context. Module C2 | Transport to disposal Module C2 includes the transport to waste treatment. In this case, transport by truck over a transport distance of 50 km is assumed. Module C3 | Waste processing In Module C3, the chipping after the removal of the products is considered. The wooden products and with them the material inherent properties leave the product system as secondary combustibles in module C3. Module C4 | Disposal The applied scenario declares the energetic recovery of the wooden products, therefore no environmental impacts are to be expected from waste processing of the products in C4. Module D | Benefits and loads beyond the system boundary Applying an European average scenario, module D describes the energetic recovery of the product at the end of life including the corresponding energy substitution potentials. | ||
| Technical purpose of product or process | Application of the products is subject to the respective national specifications. Cross-laminated timber is used in service classes 1 and 2 in accordance with EN 1995-1-1 in members with primarily static dead loads. Member resistance at normal temperature and resistance to fire are dependent on the properties of the layers, cross-sectional layup, static system and load position. Member resistance and resistance to fire must be established for the respective building in accordance with the applicable design rules. Use of wood preservatives in accordance with DIN 68800-3 is not typical and only permissible if other preservative means as per DIN 68800-2 are not sufficient on their own. Where wood preservative is used in exceptional cases, it must be regulated in the form of a national technical approval or an approval in accordance with the Biocides Directive. | ||
| Classification |
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| General comment on data set | MM-crosslam (cross-laminated timber, abbreviated as CLT or X-lam) is an industrially manufactured plane timber product for structural applications. It is used as panel or diaphragm elements and more seldomly as beams. MM-crosslam generally displays a symmetrical design and comprises at least three layers glued at right angles. MM-crosslam is supplied in various manufacturer-specific surface qualities. MM-crosslam elements are very dimensionally stable on the one hand and can also transfer loads both lengthwise and transverse to the main load-bearing direction. MM-crosslam is manufactured from spruce, fir, pine. Other coniferous species are permissible but not typical. Adhesives in accordance with 2.5 are used for gluing. MM-crosslam is manufactured with a maximum wood moisture of 15 %. MM-crosslam is manufactured in dimensions as per 2.4. | ||
| Copyright | Yes | ||
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| Data set valid until | 2029 | ||
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| Technology description including background system | To produce MM-crosslam, softwood boards are first dried to less than 15 % wood moisture, pre-planed and sorted visually or mechanically according to strength. Identified board sections with areas that reduce strength are cut out depending on the desired strength class and the resulting board sections are joined to endlessly long lamellas using finger-jointed connections. In the following pre-planing process, the lamellas are planed on four sides to thicknesses between 19 mm and 45 mm. In some cases, the lamellas are glued together using narrow side gluing to form a single-layer panel. Wood-based panels in accordance with EN 13986 can also be used during production for surface qualities. After pressing and hardening, the raw element is planed, chamfered, tied and packaged. To ensure product quality during transport to the construction site, storage or assembly, the application of a weatherproofing or wood preservative may be necessary. Technical data: The products performance values are to be declared in the Declaration of Performance based on ETA-09/0036. The performance data of the product are in accordance with the Declaration of Performance with respect to its essential characteristics according to ETA-09/0036. MM-crosslam is produced in different strength classes. For the strength class C24/T14 the following applies: Declared unit: This EPD refers to a declared unit of 1 m of cross-laminated timber produced by Mayr-Melnhof Holz Holding AG. The declared unit refers to an average density of 470 kg/m and a wood moisture at delivery of 11.5 %. | ||
Modelling and validation
| Subtype | average dataset | ||||
| LCA methodology report | |||||
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| Compliance |
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Approval of overall compliance
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Nomenclature compliance
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Methodological compliance
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Review compliance
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Documentation compliance
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Quality compliance
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| Compliance |
Compliance system name
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Approval of overall compliance
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Nomenclature compliance
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Methodological compliance
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Review compliance
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Documentation compliance
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Quality compliance
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Administrative information
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| Data generator | |
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| Time stamp (last saved) | 2024-04-09T00:00:00 |
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| Publication and ownership | |
| UUID | bb838307-4509-4d98-864a-6cb96aaa39a6 |
| Data set version | 00.02.000 |
| Registration authority | |
| Registration number | EPD-MAY-20240070-IBA1-DE |
| Owner of data set | |
| Copyright | Yes |
| License type | Free of charge for all users and uses |
| Access and use restrictions | None |
Environmental indicators
Indicators of life cycle