The glass block is a unique architectural element which is compliant with the National Construction Code (NCC) fire-rating requirements and offers solutions for increased natural light, privacy, security and insulation.
Glass blocks and fire-rating
A glass block panel installed in a wall or floor is able to prevent the spread of flames and smoke for a period of 60 minutes or longer depending on the glass block used. To see our range of fire rating glass blocks, head to our fire rated glass blocks page.
|Fire resistance classification 1530.4-1997 & 1530.4-2005||Fr 60/60-
Prevents spread of smoke and fire for 60 minutes
Integrity only |
Prevents spread of smoke and fire for 90 minutes
|Fr 60/60/60 Integrity & insulation Prevents spread of smoke, fire and thermal radiation for 60 minutes||Fr 90/90/90 Integrity & insulation Prevents spread of smoke, fire and thermal radiation for 90 minutes|
|Glass block type||Standard & Pegasus||Seves BSH 20||Seves 1960F||Seves 1990F|
|Size||190 x 190 x 80||190 x 190 x 80||190 x 190 x 160||190 x 190 x 160|
|Maximum glazed area per elements||9m²||9m²||9m²||9m²|
|Thickness of glass block wall||80mm||80mm||160mm||160mm|
|Certificates & CSIRO opinions||Ibmb 3215/1507 CSIRO fco-2115||Ibmb 3571/2980 CSIRO fco-1833||Ibmb 3187/1237 CSIRO fco-1835||Ibmb 3422/2416 CSIRO fco-1835|
- The NCC requires 60 minute fire-rating for external walls and windows less than 900mm from a boundary
- In a number of states windows within 3 metres of a brush fence must be fire- rated
- If there are multiple buildings on the same property, an external wall less than 1800mm from the next building is required to be constructed with fire-rated materials.
- The various classes of commercial buildings require different levels of fire-rating. The maximum achievable fire-rating for glass blocks in vertical walls is 90/90/90
- For horizontal structures such as floor paving, the maximum achievable fire-rating for glass blocks is 120/120/90
Fire resistance level (FRL)
The FRL consists of 3 ratings in minutes: structural adequacy/integrity/insulation.
- Structural adequacy – the ability of the structure to withstand collapse within the prescribed period
- Integrity – the ability to resist the passage of flames and smoke
- Insulation – the ability of the surface not exposed to the fire to maintain a temperature below the limits specified in AS 1530.4
The NCC states that windows or glass panels in the above external walls are required to be protected with a fire resistance level of –/60/– i.e. the ability to resist the passage of flames and smoke for 60 minutes.