32mm waste - gradient of fall

[tnarg999]

Does someone know the minimum fall you should have on a 32mm waste pipe for a washing machine. The run from the washer to the drain is about 5 metres.

Thanks

 

[crash3903]

6mm for every 300mm

this is to make sure the water goes out by having a slight fall and the waste does not back up if it is too much of a fall

 

[tnarg999]

Thanks crash - this is the absolute minimum you can get way with? So for my 5 metres I am looking at 100mm fall.

 

[seco services]

unless you want blockages from your w m

 

[crash3903]

Thanks crash - this is the absolute minimum you can get way with? So for my 5 metres I am looking at 100mm fall.

yep - the reason for this is to assist with water disposal - if the fall is too much you risk having material waste being left behind as the water flows away

hth

 

[gigz]

By the way it should be 38mm for a washing mashine

 

[tnarg999]

gigz - thanks for that. Is the 38mm in a reg somewhere?

cheers

 

[Bahco]

By the way it should be 38mm for a washing mashine

OR even 40 mm

 

[gigz]

Bacho wrote :

OR even 40 mm

Its 38mm oop north (summit to do with the cold weather)

 

[tnarg999]

Bahco - thanks - again though is 40mm a building reg or is it just common practice?

Tnarg

 

[gigz]

Cant quote the regs but if you ask for a washing machine stand pipe it'll be 38 mm (OR 40mm eh bacho )

 

[blondini]

The run from the washer to the drain is about 5 metres.

Isn't 5 metres a bit too long for an unvented waste run in 40mm?

 

[crash3903]

technically yes - in practice the max should be 3 mtrs but this should be ok

 

[Bahco]

Isn't 5 metres a bit too long for an unvented waste run in 40mm?

Good call. If you get any drainage problems then fit an anti vac trap.

Who is this BACHO