A rest bend is in affect a 90 (or 87.5) degree bend usually situated at the base of a soil vent pipe, a drop shaft or beneath a downstairs toilet, the main difference from a standard 90 degree or quarter bend as they are also known is that they are long radius and they have a foot or support fin on their base.
Full Answer
What is a rest Bend?
Rest Bends – These are used to connect soil stacks and ground floor sanitary appliances to the underground drains. It allows anything coming from the toilet pan to pass through to the drains.
Where should a rest BEND be used?
It's typically used at the foot of a soil stack to change the direction of flow from vertical to horizontal. It connects the soil and vent system to the underground drainage system. This rest bend comes with a moulded plastic foot so it's self-supporting.
Can you put a bend in a sewer pipe?
If you have to make a 90-degree bend, use two 45-degree fittings and put a small piece of straight pipe between the fittings, if possible. It's fine to have a larger-radius (sweep) 90-degree bend at the base of a vertical drainage stack where the wastewater starts to travel horizontally.
What is a soil stack?
The horizontal pipe transports used water and waste away from a property by joining with a vertical pipe on the outside of the building, this vertical pipe is known as a soil stack. The soil stack pipe is the long vertical pipe that spans the full length of a building.
How deep should a soil pipe be buried?
Pipes should be either: bedded on granular material, minimum 100mm deep, or. laid directly on the trench bottom, where the trench bottom can be accurately hand trimmed with a shovel but is not so soft that it puddles when walked on.
Can I run rainwater into a drain?
Wastewater pipes should not be connected to the rainwater system. If the rainwater gutters and gullies are connected to the wastewater drain, rainwater could overwhelm the drain and cause flooding.
Can a toilet drain have a 90?
You can have a 90-degree fitting under a slab, but it needs to be either at the base of a stack, as I've already described, or it can be under a toilet that sits on a slab.
Is there a maximum slope for sewer pipe?
For 4-inch PVC piping and a building sewer less than 50 feet long, the minimum slope is 1 inch in 8 feet, or 1/8-inch per foot, and the maximum is 1/4-inch per foot. For sewers longer than 50 feet, the slope should be 1/4-inch per foot.
How far can a toilet drain run horizontal?
Only 3 total water closets are permitted to discharge into any 3 inch horizontal drain in the UPC. The IPC does not have this limitation. It's 4 inches on the inlet of the fitting and 3 inches on the outlet. The plumbing code never allows a drain to be reduced in size in the direction of flow.
Why does my soil stack smell?
The soil vent pipe is too small or has a cowl fitted that is too restrictive to air flow, causing a 'syphon' effect when water is flushed down the drains and creating a semi vacuum in the pipe. This pulls water out of the trap, causing an imperfect seal and allowing the smell to leak back through the plug hole.
What happens if a soil pipe is not vented?
Soil vent pipes are a critical part of any drainage system. Without a vented pipe, a vacuum would build up behind the wastewater as it moves down the pipe. This would force the water out of u-bends, in turn allowing foul odours and gases to enter the property.
How many fixtures can you have on 2 vents?
The Plumbing Code states that a vent can handle 24 fixture units.
Can you have a bend in a soil pipe?
Bends. Bends at the base of stacks should be of long radius. Two 45° bends may be used as an alternative.
How do you bend a drain pipe?
Place the container with sand into the oven or on the stove and turn the heat up to 431 degrees Fahrenheit. Stir the sand to allow the heat to distribute evenly. Pour the sand back inside the pipe and let it sit for about 50 seconds to two minutes. Then bend the pipe gently until you get the desired angle.
Can you bend SDR 35 pipe?
Uni-Bell's recommendation is that offset at the joint OR uniformly bending the pipe is allowable; however, Uni-Bell does not recommend both on the same length of pipe. Using our 8” SDR 35 sewer pipe as an example, the pipe can be uniformly curved along the barrel of the pipe.
Why are rest bends prone to root ingress?
These bends are prone to root ingress mainly because they extend up to ground level, shallow root systems will work their way through disturbed ground such as a driveway sub-base before entering the system and growing down into the main line drainage.
What is a 90 degree bend?
A rest bend is in affect a 90 (or 87.5) degree bend usually situated at the base of a soil vent pipe, a drop shaft or beneath a downstairs toilet, the main difference from a standard 90 degree or quarter bend as they are also known is that they are long radius and they have a foot or support fin on their base.
Why does the first pipe snap on a concrete pad?
Even if the guy who installed your system went belt and braces and installed a proper rest bend bedded on a concrete pad we still find that the first pipe downstream of the bend can settle and snap adjacent to the rigid construction of the rest bend, this is usually due to vehicle movement or simply because there was no specification for pipe bedding on the rest of the clay drainage system downstream of the soil vent pipe.
What to use instead of a bend on old clay?
Another favourite trick used on the old clay systems would be to use a junction instead of a bend with the unused upstream collar being capped off with a piece of slate and a mortar plug as shown in the image above right, often used where a 100mm branch line meets a 150mm main line as it not only saved using a bend it also saved the additional cost of using a 100mm to 150mm adaptor pipe
How many degrees of bends are there in clay?
You tend to find that the older clay systems were made up of 30, 45 and 90 degree bends with anything less being accomplished by opening up the joints slightly on straight sections of pipe work, because the joints were sealed with sand and cement it was easy enough to slightly off set each pipe and still maintain a water tight joint.
How many degrees of turn can a drainage system bend?
Simply enough these are the changes of direction on a drainage system which are usually available from 11 ¼ to 90 degree in most materials, long and short radius bends are available and they can be plain ended as shown below left (clay) or single or double socket (underground plastic).There are also adjustable bends available in plastic that allow you to achieve 0 to 30 degrees of turn.
Do bends take pounding?
As already mentioned these bends do take a pounding with the steady and constant flow of water passing through them and as a result there will usually be water loss from at least one joint, this water loss into the sub-soil then undermines the bend or the half brick supporting it causing further movement and more water loss, and so it goes on until the lot collapses.
