Hi,

Urgently need advise...

Our kitchen have two drainage holes, one is a normal size hole, right beside it is another smaller hole, which connects back down to the normal size one as water flows down.

My tiler was suggesting that washing machine drainage connect to the normal size, while sink connects to the smaller one. reason being he said if two pipes both drain to the same normal size hole, the cover for the drainage hole may not be fully nicely covered up (as need to cut the round drainage cover to fit the two pipes), and he said cockroaches may climb out future.

So he suggest sink to smaller one. Disadvantage is if do heavy washing of floor, water may drain slowly. Normal usage of sink is ok though.

Do u think should accept his suggestion?

Firstly, where is your WM located? inside the toilet or outside the toilet?

Mine: WM situated just outside the toilet, so the draining of water is inside the toilet.

The contracter suggested the draining into the drainage hole inside the toilet using PVC pipe connection,

but we eliminated the pvc pipe so that we can 'recycle' the draining water.

Usually the draining is thru the toilet drainage hole instead of kitchen sink's,

both the case for my parents and my parents-in-law.

Hi,

Urgently need advise...

Our kitchen have two drainage holes, one is a normal size hole, right beside it is another smaller hole, which connects back down to the normal size one as water flows down.

My tiler was suggesting that washing machine drainage connect to the normal size, while sink connects to the smaller one. reason being he said if two pipes both drain to the same normal size hole, the cover for the drainage hole may not be fully nicely covered up (as need to cut the round drainage cover to fit the two pipes), and he said cockroaches may climb out future.

So he suggest sink to smaller one. Disadvantage is if do heavy washing of floor, water may drain slowly. Normal usage of sink is ok though.

Do u think should accept his suggestion?

Same as mine. 32 year old flat. Tiler is correct.

Under normal condition, water from sink to drainage is quite constant and "small enough" - which links pvc pipe underneath sink, all the way to the "smaller size" and flush with floor level. The "potential height diffenence", "distance" and "bends" are important factors.... sink tall enough, least distance to the "stack" with least bends.....

The 2 pipes(normal and small)underneath the floor linked to the "stack" at shortest possible length.

Whether verticle or horizontal loading wm, the water drainage is rather "huge" in a "sudden" manner, depending on kg size. Drainage hole best to be "big" to cater for such application, if not, water would be overflow and those "foam"......

Edited December 20, 201213 yr by bepgof