TGD A 2012 – 1.1.3.18 – Openings and chases in walls

1.1.3.18 The number, size and position of openings should not impair the stability of a wall or the lateral support provided by a buttressing wall to a supported wall. Construction over openings and recesses should be adequately supported and the ends of lintels and beams should be provided with adequate bearing. All window and door lintels should have a minimum bearing length of 150 mm. In certain circumstances e.g. beam bearings, it may be necessary to provide padstones or longer bearings.

TGD A 2012 – SUBSECTION 1 PART 3 1.1.3.18-21