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floor drains

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Andy Hall is offline

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floor drains

On 2007-04-20 23:16:21 +0100, said:

Hello,

I hear it is fashionable to fit a drain to the bathroom floor.

Perhaps it's become fashionable here.. in most other countries, and
especially in the Nordic area, it's been commonplace for decades.

It's only starting to happen here now that people are growing beyond
the idea of having carpet on the floor and that it is perfectly
possible to create a reliably sealed surface on a wooden floor.

This
could be useful if you splash in the bath. How does this work? Do you
just use a shower trap in the floor?

The floor needs to be constructed with appropriate sealing and surface.
Normally something similar to a shower trap is used. In some
installations, the bath and or shower is sufficiently close to the
floor drain that there is simply a pipe from the appliance waste under
the floor and leading into the floor drain with no trap at the
appliance. A single trap from the floor drain then connects to the
soil pipe.

It's also popular in other countries in smaller houses for the laundry
equipment to be in one of the bathrooms. Then dirty clothes, the
means to clean them and to clean the person are all in one place.

I presume it has its own pipe to the soil stack, as otherwise surely
it would flood every time you emptied the bath!

Do you make a slight (i.e. unnoticeable) slope of the floor towards
the drain?

Essentially yes.

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Dave Liquorice Dave Liquorice is offline

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floor drains

On Mon, 23 Apr 2007 14:14:16 GMT, wrote:

I'm confused about this. Why doesn't the bath water flood up through
the drain when the plug is pulled out in this scenario?

'cause the outlet from the floor drain is bigger than the inlet from the
bath, thus can handle a larger flow out than in.

--
Cheers
Dave. pam is missing e-mail

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Andy Hall is offline

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floor drains

On 2007-04-23 15:14:16 +0100, said:

On Fri, 20 Apr 2007 23:30:44 +0100, Andy Hall
wrote:

In some
installations, the bath and or shower is sufficiently close to the
floor drain that there is simply a pipe from the appliance waste under
the floor and leading into the floor drain with no trap at the
appliance. A single trap from the floor drain then connects to the
soil pipe.

I'm confused about this. Why doesn't the bath water flood up through
the drain when the plug is pulled out in this scenario?

Because the exit to the soil pipe via the trap in the floor is larger
(typically 75mm) than the pipe from the bath (typically 40mm)

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