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 glued laminated timber (moisture of 11 % at a raw density of 466 kg/m). The results refer to a representative average of glued laminated components including special shapes and represent the typical product variety of the company. The data basis for the preparation of the LCA is based on the production data of Wiehag Timber Construction GmbH in Altheim (Austria). The production site represents 100 % of the total production of Wiehag Timber Construction glued laminated timber. System boundary: The life cycle assessment of average glued laminated timber produced by WIEHAG 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 WIEHAG Timber Construction GmbH in Altheim (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 planing as well as the packaging of the product are considered. The production site is supplied with internally produced thermal and electric energy from the companys own timber gasification heat and power plant complemented by biomass boilers. Furthermore, electricity is internally produced by the own photovoltaic system. The remaining 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 | WIEHAG GLT is primarily used as a load-bearing structural glued construction product in residential and industrial buildings, as well as in timber engineering projects and even bridge construction. In general, the glulam is not treated with chemical wood preservatives. The use of preventive chemical wood preservation according to DIN 68800-3 is unusual and only permissible if structural wood preservation according to DIN 68800-2 is not sufficient on its own. If, in exceptional cases, a preventive chemical wood preservative is used, this must be regulated by a general building authority approval or approval according to the Biocidal Products Regulation. | ||
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| General comment on data set | WIEAHG Timber Construction glued laminated timber*1) is a dimensionally stable, homogeneously glued product which is used for load-bearing structures, primarily in timber engineering. WIEHAG glued laminated timber consists of at least 2 laminations/boards and is manufactured from kiln-dried softwood in accordance with the harmonised European EN 14080 product standard and includes also glued solid timber as well as composite components made of glulam and glulam with universal finger joints and special forms based on the German manufacturing and design standard for timber structures DIN 1052-10. *1) Called WIEHAG GLT in the remainder of this text, this term stands for glued laminated timber, glued solid timber, glulam composite components, glulam with universal finger joints and special forms of glulam. | ||
| Copyright | Yes | ||
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| Data set valid until | 2029 | ||
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| Technology description including background system | WIEHAG GLT is made of softwood, predominantly spruce and fir, from sustainable forestry in accordance with PEFC or FSC standards. The wet sawn timber delivered fresh from the sawmills passes through the stacking and sorting system first. This system sorts the selections into packages with intermediate strips according to the visual characteristics of the wood. The slats are then kiln-dried in drying chambers to an average wood moisture content of about 11 % and made ready for production in an air-conditioned warehouse. During the production process, the wood moisture content and the curvature or twist of each individual wooden lamination is measured and fed to the pre-planing system or sorted out immediately, depending on requirements. In the downstream process, the laminations are evaluated visually or mechanically, depending on the wood characteristics, in order to detect the strength-relevant features. These features, which have a significant impact on the strength and rigidity of the board laminations, are marked and cut out according to the quality requirements. The boards, once sorted by strength, are finger-jointed into a continuous lamination, planed to size and cut to the desired length as specified in the lamination plan (truss structure). After the finger-joint has cured in lamination storage, the adhesive is applied to the flat side and bonded in various pressing systems for straight and curved structural components to form a raw truss (the semi-finished product). After the curing process, the structural components are planed to size and glued again depending on the product type. This allows the fabrication of composite components with large dimensions or complex load-bearing structures. Depending on the finishing stage, woodworking equipment is then used to process the components in accordance with the design drawings. The GLT surfaces are finished to the customer's requirements and can be treated for protection against weather and assembly damage, or with a wood preservative. Technical data: The product's technical performance data are declared along with its essential characteristics in the declaration of performance in accordance with the EN 14080 harmonised product standard and are available for download from www.wiehag.com at any time. The table below lists example structural data in accordance with EN 14080 for GL 24h to GL 30h/c. Declared unit: This EPD refers to a declared unit of 1 m of glued laminated timber produced by WIEHAG. The declared unit refers to an average density of 466 kg/m and a wood moisture at delivery of 11 %. | ||
Modelling and validation
| Subtype | average dataset | ||||
| LCA methodology report | |||||
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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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| Time stamp (last saved) | 2024-04-05T00:00:00 |
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| Publication and ownership | |
| UUID | ba8e3b37-f28b-4778-9e4c-336102cf589b |
| Data set version | 00.02.000 |
| Registration authority | |
| Registration number | EPD-WIG-20240079-IBB1-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