Wallbarn TPE Circular Roof Outlet (Perforated Flange) – H240mm – D125mm

Wallbarn TPE Circular Roof Outlet (Perforated Flange) – H240mm – D125mm

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.

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).

Wallbarn code	Category	D1	D2	D3	D4	H
120-040-240-040	40mm	235	26	24	31	240
120-040-240-060	60mm	235	48	43	53	240
120-040-240-075	75mm	320	65	61	70	240
120-040-240-080	80mm	280	69	64	74	240
120-040-240-090	90mm	320	77	73	82	240
120-040-240-100	100mm	300	89	84	94	240
120-040-240-110	110mm	320	91	87	96	240
120-040-240-125	125mm	320	114	109	119	240
120-041-240-125 SPECIAL FOR HDPE PIPE	125mm	320	111	106	116	240
120-040-240-140	140mm	380	127	122	132	240
120-040-240-150	150mm	380	136	131	141	240
120-040-240-160	160mm	380	146	141	151	240
120-040-240-200	200mm	440	185	180	190	240