A building’s thermal performance is now as important an aspect of the building’s design and construction as its structure. Energy prices and climate change are often cited as the principal reasons for the increased energy and CO2 reduction standards required of our built environment. Less known is the fact that insulation can also play a major role in our health, safety, comfort and wellbeing.
When higher levels of thermal performance are required, this has a significant impact on building physics and other dynamic elements of a building’s performance.
Woodfibre insulation has a number of properties that enables it to provide a multifunctional role within the construction of a home. When specified and installed correctly, woodfibre provides protection against summertime overheating, enhanced acoustic performance and moisture control. The latter provides a building fabric with additional insurance against potential moisture problems that could otherwise undermine the integrity of the building and the health of the occupants.
Woodfibre is highly sustainable, locking up considerably more CO2 than is produced in manufacture. It can therefore play an essential part of a strategy for mitigating climate change.
This document provides information for specifiers and procurement specialists working on social housing projects. It is designed to help with the specification of wood fibre insulation within a social housing context. It provides performance criteria and indicates what needs to be considered when specifying woodfibre insulation.
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New-Build
Zero Carbon Homes—Zero Carbon Timber Solutions for Wales
What is the zero carbon timber housing solution for Wales?
This document proposes a range of timber build solutions. Results are based on the analysis of an appropriate and future proofed definition for ‘zero carbon’, followed by design and calculation to develop an understanding of the quantifiable factors of embodied and operational carbon. Using a fabric first approach, an examination of existing and alternative timber construction methods, materials and systems offers a range of developed timber solutions that are capable of meeting the target fabric specification. These include information on whole carbon emission and offsetting calculations for a range of key typologies demonstrating the routes to Zero.
The detailed report presents findings from the Home-Grown Homes Project including actions for further detailed design, training and skills, technical development and testing, design and modelling tools. These may be relevant for designers, manufacturers, specifiers and clients.
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Timber Cladding—Specification Guidance for Social Housing
Timber cladding has become increasingly popular, mainly for its sustainability credentials and low environmental impact: It has a low carbon footprint as it requires less energy to produce than any other construction material and helps lock carbon into the building fabric. It is made from renewable material – wood – and can be reused, recycled or used as fuel at the end of its service life. Timber cladding is widely available from sustainably managed forests and can be sourced locally.
With correct detailing, proper installation and appropriate materials, timber cladding will provide a long lasting decorative and functional façade to any type of development, new build or existing stock.
This document provides information for specifiers and procurement specialists working on social housing projects. It is designed to help with the strategic selection of timber cladding as an external rainscreen in a social housing context. It provides performance criteria for specifying timber cladding and indicates what needs to be considered to achieve these in practice. The document highlights performance benefits across a range of intended design outcomes and is designed to help ensure that timber cladding is used appropriately. Timber cladding should not be viewed in isolation and should be considered very early on in the design process when specifying details and deciding on what build system to use.
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Making the Right Choices—A Guide to Improving the Build Quality of New Build Timber Frame Social Housing
Making the right decisions for the benefit of a building’s long term performance and user experience can be compromised by cost, lack of experience, and poor understanding of timber frame construction.
This guide aims to highlight some of the key points to consider along the pathway of designing, constructing and maintaining timber frame housing.
These points have been compiled reflecting on experience gained by delivering BMTRADA’s frameCHECK on-site quality consultancy service.
By helping the reader understand more about the consequences of some of the decisions to be made during construction.
This report has been compiled as part of the Home-Grown Homes Project, which looked into the way that timber is specified and used in construction, with its focus being on manufacturing. The aim of this document is to help all those involved with timber frame construction to deliver better performing and longer lasting homes.
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Embodied Carbon Guidance for Welsh Social Housing Developers, their design teams, contractors and suppliers
This guidance has been written for those wanting to both increase their knowledge of Embodied Carbon in the housing sector and to understand how to reduce it. The target audience encompasses key stakeholders within Welsh social housing organisations including development and asset managers, their design teams, contractors and suppliers.
Clear and authoritative guidance is provided on how to procure and undertake an Embodied Carbon assessment, what benchmarks can be set, tools that can be used and how Embodied Carbon can be reduced. Examples are provided to show how others have tackled Embodied Carbon within their organisations and projects, with a focus on housing. Where relevant, other guidance and useful information is signposted.
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Authors: This guidance has been produced for Woodknowledge Wales on behalf of the Home-Grown Homes project. The document was authored by Jane Anderson of ConstructionLCA Ltd together with Katherine Adams, The Alliance for Sustainable Building Products.
Publication date: December 2020
Grŵp Cynefin video about benefits of building with timber
Video from Grŵp Cynefin explaining the benefits of choosing to build with timber. In this video see the project under way at the former Buckley Medical Centre, in the town centre. The £2.2m two-storey timber-framed building will comprise 14 two- and ten one-bedroom apartments and is being developed in partnership with Flintshire County Council.
Home-grown Timber Construction
Cwrt Rhos Fynach, Rhos on Sea
Quality homes designed, constructed and built from Wales’ woodland resource by local companies, to meet our housing needs – surely a win, win, win for our economy, environment and society?
Cwrt Rhos Fynach, Rhos on Sea was designed by Cru Architects, for Wales and West Housing Association to meet the needs of Conwy Borough Council in North Wales. Housing up to 26 residents in 11 flats, it was constructed and built by Williams Homes (Bala) Ltd using home-grown timber.
Benefits Of Using Home-Grown Timber
The Rhos on Sea project demonstrates that in Wales we have the raw materials and technical capacity to create a modern high performance and sustainable built environment. The project presents a model that if repeated all over Wales using a multitude of offsite techniques[1] available to clients would transform the quality and sustainability of the built environment and create additional economic and social value. This projects gives more confidence to an emerging Welsh industry that aspires to supply both the Welsh and English markets.
Wales has 13.8% forest cover. The European average forest cover is 37%. Increasing the forest cover of Wales would be good for bio-diversity, water, air, amenity, flood prevention and soil health. It could also supply a sustainable construction resource for our future generations.
85% of timber used in construction is imported. This means that there is a substantial market demand to enable expansion of the UK timber industry. Increased production of home-grown timber is good because:
- It improves the balance-of-trade,
- It creates employment – particularly in rural areas
- It encourages forest planting, which is good for the environment.
Increasing forestry and increased construction timber form part of climate change mitigation strategies. Forests provide a permanent carbon store. When timber is used in long life applications such as a construction beam, a carbon store is then created in buildings. Both forests and construction timber can be accounted for in a way that helps Wales meet its climate change commitments.
The Rhos on sea projects contributes to climate change mitigation in 3 key ways. (1) The high performance housing reduces operational energy consumption. (2) The use of homegrown timber creates carbon store that can be quantified and accounted for to help Wales meet its climate change commitments. (3) The indirect stimulation to forest planting is a further benefit, although difficult to quantify.
The Rhos on Sea apartments demonstrate that home-grown timber is suitable for use in modern timber frame construction. The project demonstrates that with a motivated client, it is entirely possible to construct modern affordable high performance Welsh houses in a way that stimulates the development of Welsh businesses and the local timber industry and creates confidence about future demand.
[1] Open panel, closed panel, pre-insulted panel, volumetric etc.
Homegrown Timber in UK Construction – Case Studies, Volume. 1
The projects showcased here represent a snap-shot of what’s happening throughout the whole of the UK, but with an emphasis on projects in Wales – from housing to retail, simple homes and social housing to high end self-build, as well as offices and schools.
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