Viewpoint: Ethics and the climate emergency: personal values and corporate decision making

This month's letters include an answer to a mystery wall construction, dampness in buildings and earthquake resistance research.

The light weight and prefabricated nature of cross-laminated timber make it an ideal candidate for retrofit and extension projects, argues Alex Lynes. It just needs to be detailed well for durability.

Jonathan Skinner, James Morton and Alan Dowdall of Ramboll describe their work to refine the inputs to an activity-based approach to calculating A4 carbon emissions for mass timber, and encourage the industry to go further by reporting actual fuel usage for transportation.