We work extensively with architects to ensure that doorway circulation areas, clear widths and latch side clearances are correct under AS1428.1. We also do a lot of work to make sure accessible toilets are appropriate, with pan, basin and shower circulation areas, fixtures, and fittings designed in accordance with AS1428.1. So, why are many of these elements incorrect when we go to building sites?
In rare instances, we find that a few architects simply don’t apply AS1428.1 properly. Some even use older versions of the code. More often than not, there are design and construction coordination issues.
We often review CC drawings. However, design changes within the construction documentation will sometimes occur after our review, such as enlarging a room or repositioning a riser adjacent to certain doors or accessible toilets. Sometimes, these changes hurt AS1428.1 compliance and are not picked up.
In other situations, the contractor’s workshop drawings may be imperfect based on incorrect assumptions or knowledge of AS1428.1, even though the construction documentation is fully compliant.
My point is that quality control within a project needs to be more rigorous, and perhaps another review of documentation may be required as added insurance.
Also, within accessible toilets, wash basins are allowed to encroach into the pan circulation area by no more than 100mm when the basin is in front of the pan. It is important to note that no encroachment is allowed when the basin is at the side of the pan.
What is important to note is that the basin projection from the rear wall cannot be less than 430mm. In the marketplace, the best accessible basins have a 450mm projection. Make sure this projection is designed into your accessible toilets to get the right internal dimensions.
