Wallbarn TPE Extra Long Circular Outlet (Perforated Flange)

Wallbarn TPE Extra Long Circular Outlet (Perforated Flange)

WALLBARN SUPPLIES A RANGE OF OUTLETS AND DRAIN CONNECTORS TO HELP ENSURE THE WATERPROOFING INTEGRITY OF THE ROOF DECK IS MAINTAINED AROUND THE DRAIN HOLES AND INTO THE RAINWATER OUTLET PIPE.

Wallbarn can also supply drain connectors with a 600mm long shank, where outlet pipes are passing through things such as thick insulation or industrial metal roofs.

Fitted and secured in exactly the same way as the standard drain connector, being sandwiched between two layers of waterproofing membrane, they are designed to pass through the entire section of roof and into the downpipe, and so eliminate the need for multiple connections and extension fittings (which always carry the risk of leaks around each connection).

TPE is a compound of EPDM and polypropylene, developed as a cost effective way to waterproof and protect drainage holes and outlets on roofs and balconies in conjunction with bituminous waterproofing membranes. The material is tough, flexible and durable.

It is UV stable and resistant to deterioration by normal atmospheric elements and ground salts. It can withstand temperature of 120°C and will not become brittle at very low temperatures.

These outlets, collars and vents are ideal for SBS and APP bituminous membranes, including built-up (felt), mastic asphalt, hot melt and other liquid applied membranes.

They are designed to be sandwiched between two layers of waterproofing membrane and installed whilst those two layers are still tacky, to ensure that an over-and-under bond is created, producing a secure fix.

The drain connector is used for downpipes and circular / downpipe outlets on a roof or terrace within the main body of the concrete deck.

The idea is that the concrete deck is fully waterproofed around the hole and into the hole with a first layer / coat of membrane. The connector is then inserted into the hole, and a second coat / layer of membrane is installed on top of the flap (flange).

The connectors are manufactured with a perforated flange – this is a series of holes around the profile, so the membrane oozes through to bond to itself in a sandwich situation, ensuring a very secure bond

It is essential that the connector does not come into direct conatct with the bare concrete, as this risks the chance of water passing beneath the rubber profile and ingressing into the structure. The connector sits between two layers of waterproofing.

For two coat liquid applied membranes this can be achieved fairly easily without disruting the waterproofing process. For membranes such as felt, best practice follows that an area around the hole is covered with one layer of felt (which is fully bonded to the deck in a patch), and then the main element of the felt membrane is laid down as normal onto the deck, and the areas which overlap the patch are torch bonded together, achieving a full watertight bond.

The shank or pipe is manufactured to a slight cone shape, making it easier to press into the hole and helping to prevent the connector rising out of the hole.

There are two rings (4) on the shank which help to ensure that as it is pressed into the hole no water can pass back up the pipe, acting as a further drain trap.

At the mouth of the shank there are a series of ribs and serrations (3) along the inside, which ensure a leaf-excluder or gravel-excluder can be fitted into the connector securely.

These drain connectors are designed to sit inside an HDPE drainpipe with a snug fit. It is important, when measuring, to ensure that the outer diameter of the Wallbarn drain connector can fit inside the inner diameter of the pipe, especially when some HDPE pipes are measured in inches rather than metric.

They are measured as follows:

H is the height of the spigot or pipe

D1 is the outer diameter of the flange or surrounding ring

D2 is the inner diameter of the pipe at the top

D3 is the inner diameter of the pipe at the bottom

D4 is the outer diameter of the pipe at the top

which needs to be smaller than the inner diamter of the HDPE drainpipe (which is often measured in imperial measurements).