Insulation stops heat escaping by blocking conduction. But it can’t do its job properly if heat is also being carried away by unwanted air movement. Kate de Selincourt talked to Mark Siddall and asked him to explain how thermal bypass may undermine building performance – and what we can do to prevent it.

From concept to handover, we describe what needs to happen at every RIBA stage for a successful airtightness test.

​Flat roofs can carry more risk of condensation and moisture damage. Here’s how, by using the right design and choice of products, you can achieve a safe and dry flat roof construction using the hybrid or ’compact’ roof principle.