Steel lintels
Most loadbearing brick or blockwork walls over openings, where the cavity insulation is continued down to the head of the window or door frame, are supported by steel section …
Head of openings in cavity walls
The brickwork and blockwork over the head of openings in cavity walls has to be supported. Because of the bonding of brickwork and blockwork over the opening it is …
Cills and thresholds of openings
A cill is the horizontal finish to the wall below the lower edge of a window opening on to which wind driven rain will run from the hard, smooth, …
Openings in walls
The practical guidance in Approved Document A in regard to openings in walls states that the number, size and position of openings should not impair the stability of a …
The length of wall ties
The spacing of wall ties built across the cavity of a cavity wall is usually 900 mm horizontally and 450 mm vertically, or 2.47 ties per square metre, and …