Facade Systems | Archive Titles

Item	W/m of facade	G-value	Height	System
1	100	0.05	2.6	Passive chilled beams or displacement systems
2	200	0.10	2.6	Active chilled beams
3	300	0.15	2.6	Low-capacity fan coil units or all air system
4	400	0.20	2.6	High-capacity fan coil units but with poorer building energy performance

	Description	Cost/m²	Comments
A	Unitised curtain wall, high- performance coated glass sealed units with G-value of 0.25, solid spandrel panels	£650/m²	Based on table above, this solution will not achieve compliance and will require additional solar control measures
A1	Unitised curtain wall, as described in A, but 50% solid panels in addition to spandrel panels	£750/m²	Should be capable of achieving G-values of 0.15 and 0.20, possibly with less dark high-performance glass, thus cost-effective
A2	Unitised curtain wall, high- performance coated glass sealed units with G-value of 0.25, solid spandrel panels	£800/m²	Should be capable of achieving G-values of 0.15 and 0.20, possibly with less dark high-performance glass, thus cost-effective
A3	Unitised curtain wall, as described in A, but with external brise soleil (horizontal blades to south, vertical to east and west)	£850/m²	Should be capable of accommodating a G-value of 0.10, including high-performance glass
B	Unitised curtain wall, as described in A2, but with greater density of brise-soleil for improved solar shading Unitised “externally” ventilated cavity double wall facade, with cavity depth about 100mm. This solution does not require mechanically conditioned air in the cavity. Wider walk-in cavity facades attract a cost premium	£1100/m²	This option comprises motorised venetian blinds within the cavity, which requires electrical and BMS supply. For a 3.8m storey height and no spandrels, a minimum G-value of 0.10 should be achieved with blinds closed