1.2.15  External Walls

It is essential that external walls are homogenous with the frame. If, for example, a steel frame is used then it will be necessary to weld ties to steelwork in order to ensure an adequate bond.

Cavity trays are to be incorporated wherever the cavity is narrowed or bridged and below all openings. All wall ties, support, angles, etc, are to be of stainless steel and are to be concealed in the completed work.

Mastic pointing to expansion joints and at the abutment of walls and glazing shall be colour co-ordinated with the masonry. All mastic pointing shall have straight edges, an even width and a neat appearance.

All beading to render finishes shall be appropriate and non-corrosive such as stainless steel.

Design and materials shall allow for the easy removal of graffiti.

Finishes shall conform to Class 0 as defined by Buildings regulations.

Non-combustible materials (or materials treated so as to be non-combustible) shall be used, especially for all exposed and accessible construction elements and, if high levels of insulation are required, Loss Prevention Certification Board (LPCB) products approved to LPS1181 Grade A shall be used. These shall have at least 30 minutes fire integrity and 20 minutes fire insulation.