Lifecycle Database

Engineered wood products like CLT, glulam, LVL, timber frame and trussed rafters

Cross Laminated Timber

Cross laminated timber (CLT) is an engineered wood product consisting of a number of layers of wood glued at right angles to one another.

Key Information

General Process Description 1m3 of cross laminated timber based on the UK consumption mix.
Reference Flow/
Declared Unit
1m3 of cross laminated timber, 12% wood moisture content (dry basis), average product density of 488kg/m3.
Reference Year 2013

This generic dataset has been developed with reference to CEN/TR 15941:2010 Environmental product declarations – Methodology for selection and use of generic data and has made use of data from existing databases and EPD, compensated with data from UK industry and national statistics for the specific situation related to UK consumption of timber products. With regard to methodology, the datasets are in line with the core Product Category Rules given in EN 15804+A1: 2013 Environmental product declarations – Core rules for the product category of construction products, and further detailed in FprEN 16485:2013 Round and sawn timber – Environmental Product Declarations – Product category rules for wood and wood-based products for use in construction and the draft EN 16449, Wood and wood-based products – Calculation of sequestration of atmospheric carbon dioxide.

For more detailed information:

Glued Laminated Timber

Glued laminated timber (glulam) is an engineered wood product consisting of a number of layers of wood held together with a synthetic adhesive.

Key Information

General Process Description 1m3 of glued laminated timber based on the UK consumption mix.
Reference Flow/
Declared Unit
1m3 of glued laminated timber, 12% wood moisture content (dry basis), average product density of 490kg/m3.
Reference Year 2013

This generic dataset has been developed with reference to CEN/TR 15941:2010 Environmental product declarations – Methodology for selection and use of generic data and has made use of data from existing databases and EPD, compensated with data from UK industry and national statistics for the specific situation related to UK consumption of timber products. With regard to methodology, the datasets are in line with the core Product Category Rules given in EN 15804+A1: 2013 Environmental product declarations – Core rules for the product category of construction products, and further detailed in FprEN 16485:2013 Round and sawn timber – Environmental Product Declarations – Product category rules for wood and wood-based products for use in construction and the draft EN 16449, Wood and wood-based products – Calculation of sequestration of atmospheric carbon dioxide.

For more detailed information:

Laminated Veneer Lumber (LVL)

Laminated veneer lumber (LVL) is an engineered wood product consisting of multiple thin layers of wood held together with a synthetic adhesive.

Key Information

General Process Description 1m3 of laminated veneer lumber based on the UK consumption mix.
Reference Flow/
Declared Unit
1m3 of laminated veneer lumber, 12% wood moisture content (dry basis), average product density of 488kg/m3.
Reference Year 2013

This generic dataset has been developed with reference to CEN/TR 15941:2010 Environmental product declarations – Methodology for selection and use of generic data and has made use of data from existing databases and EPD, compensated with data from UK industry and national statistics for the specific situation related to UK consumption of timber products. With regard to methodology, the datasets are in line with the core Product Category Rules given in EN 15804+A1: 2013 Environmental product declarations – Core rules for the product category of construction products, and further detailed in FprEN 16485:2013 Round and sawn timber – Environmental Product Declarations – Product category rules for wood and wood-based products for use in construction and the draft EN 16449, Wood and wood-based products – Calculation of sequestration of atmospheric carbon dioxide.

For more detailed information:

Timber Frame – Closed Panel System

Closed panel timber frames are generally pre-fabricated systems designed for use in external wall construction.

Key Information

General Process Description 1m2 of a closed panel timber frame system based on the UK consumption mix.
Reference Flow/
Declared Unit
1m2 of a closed panel timber frame system consisting of vertical and horizontal softwood beams, softwood structural noggins, mineral wool insulation, OSB or plywood sheathing and hot dip galvanised steel fixings.
Reference Year 2013

This generic dataset has been developed with reference to CEN/TR 15941:2010 Environmental product declarations – Methodology for selection and use of generic data and has made use of data from existing databases and EPD, compensated with data from UK industry and national statistics for the specific situation related to UK consumption of timber products. With regard to methodology, the datasets are in line with the core Product Category Rules given in EN 15804+A1: 2013 Environmental product declarations – Core rules for the product category of construction products, and further detailed in FprEN 16485:2013 Round and sawn timber – Environmental Product Declarations – Product category rules for wood and wood-based products for use in construction and the draft EN 16449, Wood and wood-based products – Calculation of sequestration of atmospheric carbon dioxide.

For more detailed information:

Timber Frame – Open Panel System

An open panel timber frame consists of vertical and horizontal softwood structural beams with horizontal structural noggins used to give additional stability to the system.

Key Information

General Process Description 1m2 of an open panel timber frame system in the UK.
Reference Flow/
Declared Unit
1m2 of an open panel timber frame system consisting of vertical and horizontal softwood beams and softwood structural noggins secured with hot dip galvanised steel fixings.
Reference Year 2013

This generic dataset has been developed with reference to CEN/TR 15941:2010 Environmental product declarations – Methodology for selection and use of generic data and has made use of data from existing databases and EPD, compensated with data from UK industry and national statistics for the specific situation related to UK consumption of timber products. With regard to methodology, the datasets are in line with the core Product Category Rules given in EN 15804+A1: 2013 Environmental product declarations – Core rules for the product category of construction products, and further detailed in FprEN 16485:2013 Round and sawn timber – Environmental Product Declarations – Product category rules for wood and wood-based products for use in construction and the draft EN 16449, Wood and wood-based products – Calculation of sequestration of atmospheric carbon dioxide.

For more detailed information:

Trussed Rafters

Trussed rafters are structural systems designed to support the roof of a building and consist of timber and steel connector plates.

Key Information

General Process Description Softwood spruce trussed rafter – 8m span. Fink truss for a roof with a 35° pitch.
Reference Flow/
Declared Unit
Softwood trussed rafter with an 8m span. Galvanised steel connector plates also included.
Reference Year 2013

This generic dataset has been developed with reference to CEN/TR 15941:2010 Environmental product declarations – Methodology for selection and use of generic data and has made use of data from existing databases and EPD, compensated with data from UK industry and national statistics for the specific situation related to UK consumption of timber products. With regard to methodology, the datasets are in line with the core Product Category Rules given in EN 15804+A1: 2013 Environmental product declarations – Core rules for the product category of construction products, and further detailed in FprEN 16485:2013 Round and sawn timber – Environmental Product Declarations – Product category rules for wood and wood-based products for use in construction and the draft EN 16449, Wood and wood-based products – Calculation of sequestration of atmospheric carbon dioxide.

For more detailed information:

User Guide

An overview of the lifecycle assessment work

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Glossary

Definitions of commonly used terms

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