Home |
Search |
Today's Posts |
|
UK diy (uk.d-i-y) For the discussion of all topics related to diy (do-it-yourself) in the UK. All levels of experience and proficency are welcome to join in to ask questions or offer solutions. |
Reply |
|
LinkBack | Thread Tools | Display Modes |
#1
Posted to uk.d-i-y
|
|||
|
|||
Minimum gradient of bath/washbasin waste pipe
Our bath/washbasin waste pipe emerges through the wall and then, via an
elbow, goes very slightly *uphill* for a run of a couple of feet, before another elbow joint connects to a vertical pipe to ground level. The highest point is probably an inch or so above the point where the pipe emerges through the house wall, but as far as I can estimate, is below the level of the bath plughole. Is this likely to be responsible for water that is run out of the bath ejecting the water from the washbasin U trap, or water from the washbasin flowing into the bath and/or ejecting the bath's U trap wate, with copious gurgling? And also causing very slow drainage of water from the bath (several minutes to empty the bath). I can see that even if it's not the cause of the gurgling and back flow into the bath, it's not a good idea to have water standing in the pipe because it will (and does!) freeze in cold weather: several times I've had to dismantle the pipework and pour boiling water down the section that is normally horizontal/uphill, to encourage the plug of ice to emerge. |
#2
Posted to uk.d-i-y
|
|||
|
|||
Minimum gradient of bath/washbasin waste pipe
In message , NY
writes Our bath/washbasin waste pipe emerges through the wall and then, via an elbow, goes very slightly *uphill* for a run of a couple of feet, before another elbow joint connects to a vertical pipe to ground level. The highest point is probably an inch or so above the point where the pipe emerges through the house wall, but as far as I can estimate, is below the level of the bath plughole. Is this likely to be responsible for water that is run out of the bath ejecting the water from the washbasin U trap, or water from the washbasin flowing into the bath and/or ejecting the bath's U trap wate, with copious gurgling? And also causing very slow drainage of water from the bath (several minutes to empty the bath). Seems likely. The uphill bit has to be full allowing the flow to suck. I can see that even if it's not the cause of the gurgling and back flow into the bath, it's not a good idea to have water standing in the pipe because it will (and does!) freeze in cold weather: several times I've had to dismantle the pipework and pour boiling water down the section that is normally horizontal/uphill, to encourage the plug of ice to emerge. -- Tim Lamb |
#3
Posted to uk.d-i-y
|
|||
|
|||
Minimum gradient of bath/washbasin waste pipe
On Monday, 16 April 2018 21:21:35 UTC+1, NY wrote:
Our bath/washbasin waste pipe emerges through the wall and then, via an elbow, goes very slightly *uphill* for a run of a couple of feet, before another elbow joint connects to a vertical pipe to ground level. The highest point is probably an inch or so above the point where the pipe emerges through the house wall, but as far as I can estimate, is below the level of the bath plughole. Is this likely to be responsible for water that is run out of the bath ejecting the water from the washbasin U trap, or water from the washbasin flowing into the bath and/or ejecting the bath's U trap wate, with copious gurgling? And also causing very slow drainage of water from the bath (several minutes to empty the bath). I can see that even if it's not the cause of the gurgling and back flow into the bath, it's not a good idea to have water standing in the pipe because it will (and does!) freeze in cold weather: several times I've had to dismantle the pipework and pour boiling water down the section that is normally horizontal/uphill, to encourage the plug of ice to emerge. I have some experience with uphill waste pipework. It doesn't seem to impede drainage much - but if one section's uphill, the rest may also be badly laid out, causing slow drainage. Slow drainage plus uphill = collection of muck, causing partial blockage. NT |
#4
Posted to uk.d-i-y
|
|||
|
|||
Minimum gradient of bath/washbasin waste pipe
NY expressed precisely :
I can see that even if it's not the cause of the gurgling and back flow into the bath, it's not a good idea to have water standing in the pipe because it will (and does!) freeze in cold weather: several times I've had to dismantle the pipework and pour boiling water down the section that is normally horizontal/uphill, to encourage the plug of ice to emerge. I would look to modifying that, it does need to have a constant fall, to avoid problems of freezing and blockage from dirt. It is also bound to cause the gurgling and slow drainage. |
#5
Posted to uk.d-i-y
|
|||
|
|||
Minimum gradient of bath/washbasin waste pipe
On 17/04/18 07:41, Harry Bloomfield wrote:
NY expressed precisely : I can see that even if it's not the cause of the gurgling and back flow into the bath, it's not a good idea to have water standing in the pipe because it will (and does!) freeze in cold weather: several times I've had to dismantle the pipework and pour boiling water down the section that is normally horizontal/uphill, to encourage the plug of ice to emerge. I would look to modifying that, it does need to have a constant fall, to avoid problems of freezing and blockage from dirt. It is also bound to cause the gurgling and slow drainage. 1:100 to 1:60 for turds bathwater can be steeper. -- Theres a mighty big difference between good, sound reasons and reasons that sound good. Burton Hillis (William Vaughn, American columnist) |
#6
Posted to uk.d-i-y
|
|||
|
|||
Minimum gradient of bath/washbasin waste pipe
On Monday, 16 April 2018 21:21:35 UTC+1, NY wrote:
Our bath/washbasin waste pipe emerges through the wall and then, via an elbow, goes very slightly *uphill* for a run of a couple of feet, before another elbow joint connects to a vertical pipe to ground level. The highest point is probably an inch or so above the point where the pipe emerges through the house wall, but as far as I can estimate, is below the level of the bath plughole. Is this likely to be responsible for water that is run out of the bath ejecting the water from the washbasin U trap, or water from the washbasin flowing into the bath and/or ejecting the bath's U trap wate, with copious gurgling? And also causing very slow drainage of water from the bath (several minutes to empty the bath). I can see that even if it's not the cause of the gurgling and back flow into the bath, it's not a good idea to have water standing in the pipe because it will (and does!) freeze in cold weather: several times I've had to dismantle the pipework and pour boiling water down the section that is normally horizontal/uphill, to encourage the plug of ice to emerge. A Bing search for the words of your Subject line, without surrounding quotes, would seen to offer sufficient enlightenment. -- SL |
#8
Posted to uk.d-i-y
|
|||
|
|||
Minimum gradient of bath/washbasin waste pipe
|
Reply |
Thread Tools | Search this Thread |
Display Modes | |
|
|
Similar Threads | ||||
Thread | Forum | |||
washbasin waste seal leaking ! | UK diy | |||
washbasin waste seal leaking ! | UK diy | |||
Waste from bathroom washbasin | UK diy | |||
40mm waste steep gradient required. | UK diy | |||
Sizing of waste pipe for washbasin | UK diy |