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2 posts

Wannabe Geek

# 257137 17-Sep-2019 11:43
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So when being in NZ there is not a lot of option for a lot products in construction unless I want to import. Having products that are available in NZ is far more convenient but sometimes your using them outside there intended application. Is there a way to use a channel drain for a walk-in shower in a bathroom that is intended to be rebated into a concrete floor on a timber floor?


I have a potential design project, in it I have the ability to lower the timber joists as much as I want but is there a way to use a concrete screed on top of a membrane in order to protect the wood but still have the ability to set the drain? would I need another layer of membrane for the tiles that would go on top of the screed? The other factor to account for would be the weight of the screed. I currently have 190x45 joists @ 400 centers but like I said I have a lot of wiggle room in that department. Is it possible or am I missing something else and would the council sign off on it?


thanks for any help in advance. 

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1846 posts

Uber Geek

  # 2319146 17-Sep-2019 12:58
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What you will probably want to look at doing is use a membrane floor over a plywood substrate. The substrate is set below the bathroom floor and to fall into a drain (It doesn't need to be a channel, it could be a central drain). You will then put a timber frame topped with boards you would stand on (aka Duckboards) over the membrane (using feet to protect the membrane).


Or if that's not what you meant in your description then post a drawing of the situation and it might be a bit clearer. 

5650 posts

Uber Geek

  # 2319214 17-Sep-2019 14:46
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Seen these guys?


They have a number of solutions for wet area showers recessed into a timber joist floor.


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Wannabe Geek

  # 2319272 17-Sep-2019 16:00
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Its not 100% what I was looking for but this is a far better option than what I was looking at thanks

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