The following table details the back fill requirements for fire resistant metal door frames under AS1905.1-2005.
Under the current Australian Standard AS1905.1-2005, EVERY fire resistant metal door frame is required to be back filled.
| Wall Type | Doorset Type | Maximum Door Leaf Size in mm | Frame Thickness in mm | FRL up to |
|---|---|---|---|---|
| Masonry - Built in or Retrofit | MINI Single Leaf | 2350 x 1200 | 1.1 | ---/120/30 |
| MAXI Single Leaf | 2400 x 1200 | 1.4 | ---/120/30 | |
| Masonry - (Built in only) | MAXI Single Leaf | 3500 x 1200 3000 x 1500 |
1.4 | ---/240/30 |
| Masonry - Built in or Retrofit | MAXI Double Leaf | 2400 x 2400 | 1.4 | ---/120/30 |
| Masonry - (Built in only) | MAXI Double Leaf | 3500 x 2400 3000 x 3000 |
1.4 | ---/240/30 |
| Plasterboard | MINI Single Leaf | 2350 x 1200 | 1.1 | ---/120/30 |
| MAXI Single Leaf | 2400 x 1200 | 1.4 | ---/120/30 | |
| MAXI Single Leaf | 3000 x 1500 | 1.4 | ---/180/30 | |
| MAXI Double Leaf | 2400 x 2400 | 1.4 | ---/120/30 | |
| Hebel Wall | MINI Single Leaf | 2350 x 1200 | 1.4 | ---/120/30 |
| MAXI Single Leaf | 2400 x 1200 | 1.4 | ---/120/30 | |
| MAXI Double Leaf | 2400 x 2400 | 1.4 | ---/120/30 | |
| Rapidwall Wall Systems | MINI Single Leaf | 2350 x 1200 | 1.4 | ---/120/30 |
| MAXI Single Leaf | 2400 x 1200 | 1.4 | ---/120/30 | |
| MAXI Double Leaf | 2400 x 2400 | 1.4 | ---/120/30 | |
| FRAMES FOR THE DOORS AS DETAILED ABOVE ARE REQUIRED TO BE BACK FILLED TO BE IN ACCORDANCE WITH THE REQUIREMENTS OF AS1905.1-2005 | ||||
Previous revisions of this standard allowed for frames in certain circumstances to be unfilled but due to more stringent testing under AS1530.4, it is now required for all fire resistant frames to be backfilled if certified in accordance with the provisions of AS1905.1-2005 unless evidence of a test or opinion in accordance with AS1530.4-2005 can be provided to support the installation.
If you have existing installations that pre date 2005 and would like to find out the requirements at that time we would recommend you seek the advise of a fire engineer or building certifier or contact your fire services provider who may be able to assist.