Waterproofing the bathroom - help!

[Lonks]

We are at the stage of waterproofing our bathroom and I just needed some advice on the procedure. We have installed a bath/shower that has 2 brick steps that have been cement rendered. The father in law has been doing this work us (nice bloke!) but needs us to do the waterproofing before the weekend. He has suggested that we only waterproof the corners around the floor of the bathroom (concrete) and apply membrane to the entire enclosed bath area up to 1800mm high on the walls. We have bought gripset waterproofing membrane and the gripset RF fabric (and primer of course), and after reading the instructions it looks like we only apply the fabric to the corners/joins and just apply the membrane to the rest.

I just need some re-assurance here that we are doing the right thing - I always thought waterproofing included basically the entire bathroom - but the father in law reckons we don't even need to do waterproof the entire brick step area.

Any thoughts? Suggestions? Any help is greatly appreciated

[ThePope]

and after reading the instructions it looks like we only apply the fabric to the corners/joins and just apply the membrane to the rest.

I just need some re-assurance here that we are doing the right thing - I always thought waterproofing included basically the entire bathroom - but the father in law reckons we don't even need to do waterproof the entire brick step area.

Yes that sounds about right, there's no need to do the entire bathroom.
I'd run some around the joint between brick step and bath aswell.

[Pulse]

AS 3740 covers waterproofing of residential areas. There are specific requirements for waterproofing. The shower up to 1800, and the hob and out onto the floor. You also need appropriate bond breakers in all corners. I've recently tried an external deck and now have new respect for waterproofing after several leaks developed. I followed instructions explicitly as found in the standard and still had leaks. Is it a ground floor or first floor bathroom?

Pulse

[Lonks]

Thanks for the responses!

Pulse, the bathroom is on the ground floor so luckily we won't have any problems with leaks going through to another level.

[ThePope]

I've recently tried an external deck and now have new respect for waterproofing after several leaks developed. I followed instructions explicitly as found in the standard and still had leaks.

Been wondering how you got on with your deck, did you manage to overcome your setback.

[Pulse]

with a few buckets for now, Will get it all done, inspected by council and then organise a waterproof shade sail I think.

Cheers
Pulse