Wallbarn EPDM Circular Roof Outlet (Smooth Flange) - H240mm - D90mm

Wallbarn EPDM Circular Roof Outlet (Smooth Flange) - H240mm - D90mm

CIRCULAR ROOF OUTLETS ARE MANUFACTURED WITH A SMOOTH FLANGE WHERE APPLICATORS ARE BONDING OR MECHANICALLY FIXING DRAIN CONNECTORS TO THE WATERPROOFING MEMBRANE ACROSS THE FACE OF A FLAT ROOF OR TERRACE

The spigot is 250mm long and is inserted down inside of the HDPE drainpipe. This gives ample assurance that no water can back up behind the rubber and onto the deck. The spigot is slightly cone shaped and ribbed. This helps with installation into the hole, and prevents water passing back up behind the spigot.

The mouth of the shank has a series of internal serrations so the gravel guard or leaf excluder can be fitted easily and securely. Remember installers of these outlets will always need to insert leaf guards or gravel excluders (this will be a hyperlink to “accessories” page) into the moth of these connectors to prevent the pipes becoming blocked.

They are positioned throughout the roof deck at intervals approximately 25 – 30m2 apart to handle the amount of potential UK rainwater run-off.

INSTALLATION

Waterproof the area around the drainage hole. This can be done either by installing a patch around the area or by waterproofing the entire deck in the normal manner. Insert the correct size of outlet connector into the hole so that it is covering the waterproof membrane. Secure the connector either by using fixings or adhesive.
Then prepare the area for another layer of waterproofing membrane so that the outlet connector is encapsulated in a “sandwich”. To ensure that the second coat of waterproofing bonds properly, the area should be primed. Here a patch of the same type of membrane is installed and adhered across the face of the outlet connector, completely covering the flange and bonding to both it and the first layer of waterproofing membrane beneath. By doing this the water cannot get behind any parts of the connector and enter the structure.

Once the membrane / adhesive is cured a hole may need to be cut to reveal the drain pipe, and a leaf guard or gravel excluder is inserted into the hole. The outlet is then finished.

Above is an example of the circular outlet with a smooth flange, where the surround is bonded to the waterproofing membrane.

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 well at the top and also the outer diameter of the leaf guard

The circular / downpipe outlets with smooth flange are available in the following sizes: