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We offer a wide range of glazing systems which can achieve large spans to suit most designers requirements

The glazing system must always be fixed to OTHERS structural supports which require pitching to the roof slope to acheive weathertightness.

On deep glazing (slope lengths over 3200mm) a structural intermediate purlin (by others) is usually introduced into the design at the mid span position to enable a lighter glazing bar section to be used. Because glass over this length is not available in a single peice as standard, a convenient and common place to join the glass is over the intermediate purlin.

Please note that due to the manufacturing process of our Heritage Lead Clothed Steel glazing bars, we cannot supply them in lengths exceeding 3350mm (11'-0") regardless of whether intermediate supports are provided. If the glazing is required to exceed this length then the design must incorporate a break/tier to overcome this limitation.

Our charts below show indicative spans for all our glazing bar ranges based on the glazing bars being spaced at 600mm centres and should be used for guidance only.

 
Bar Section
Depth mm
Ix-x cm4
Zx-x cm3
Maximum Span Roof Single Glazing (mm)
Maximum Span Roof Double Glazing (mm)
Maximum Span Vertical Single Glazing (mm)
Maximum Span Vertical Double Glazing (mm)
SPG5
70
408,448
11,422
4000
2400
3800
3000
SPG7
95
1.018,214
21,747
5000
3750
4800
3800
SPG10
120
1,837,643
29,225
5700
4500
5500
4400
SPG15
170
4,698,570
51,317
7500
5750
7000
5500
 
Bar Section
Depth mm
Ix-x cm4
Zx-x cm3
Maximum Span Roof Single Glazing (mm)
Maximum Span Roof Double Glazing (mm)
Maximum Span Vertical Single Glazing (mm)
Maximum Span Vertical Double Glazing (mm)
SPG2
70
17,366
3,893
2000
1600
3000
2400
SPG3
90
41,123
7,299
3500
3000
3800
3000
SPG4
115
111,709
17,848
5000
4000
4900
3850
 
Bar Section
Depth mm
Ix-x cm4
Zx-x cm3
Maximum Span Roof Single Glazing (mm)
Maximum Span Roof Double Glazing (mm)
Maximum Span Vertical Single Glazing (mm)
Maximum Span Vertical Double Glazing (mm)
BL2
52
7,532
2,245
  1750
-
2050
-
BL4
64
16,681
4,427
2250
2000
3050
2400
BL6
76
30,630
7,473
3400
2700
3550
2800
BL7
89
56,324
11,649
4200
3200
4100
3300
BL8
102
83,947
15,981
4700
3650
4500
3600
 
Bar Section
Depth mm
Ix-x cm4
Zx-x cm3
Maximum Span Roof Single Glazing
Maximum Span Roof Double Glazing
Maximum Span Vertical Single Glazing
Maximum Span Vertical Double Glazing
No. 5
45
6,650
2,376
2700
-
2900
-
No. 7
53
13,070
4,031
3250
2700
3250
3050
Due to the manufacturing process of our Heritage Lead Clothed Steel glazing bars, we cannot supply them in lengths exceeding 3350mm (11'-0") regardless of whether intermediate supports are provided. If the glazing is required over this length then the design must incorporate a break/tier to overcome this limitation.
 
 
Maximum glazing bar spans are based on the glazing bars being spaced at 600mm centres and are for guidance only. We will select the appropriate glazing bar for each contract. Spans are dependent upon the pitch of glazing, glazing bar centres, building shape, wind load, snow load, dead load and maintenance load.