Revisions to PPG3 and Part L of the building regulations have precipitated significant development programmes by manufacturers of the affected components. The usage of heavy-duty lintels has increased, with sales increases of 100 mm cavity lintels of 20% being reported. Numerous cavity tray designs are also appearing, with increasing use of cavities of 100 mm and above. Self-supporting upstands are now available which accommodate cavities up to 150 mm. Materials and designs for dpc applications are also evolving, as moisture ingress is considered a common problem in modern buildings.