There are loads of purposes that roof drains fulfil especially in the rainy and prolonged wet areas. It is vital to maintain these roof drains so that they can work properly. Roof drains are usually subjected to regular wear and tear along with heavy weathering. As a result, all the parts like rings, domes, clamps and sump pans may crack or even break. It can corrode over time therefore you may need to replace it. To buy it is vital for you to know the model of the drain.
Few characteristics of the drain are important to be known while you are replacing one. Have a glance at these characteristics:
1) Colour of the roof drain
One of the easiest methods to identify the correct roof drains' manufacturer is thoroughly by colour. Remember that every 4 biggest roof drain manufacturers use some unique colour for all the products - a) Blue b) Mustard Yellow c) Red c) Green
2) Size of drain rings
For finding the right model for the replacement of the roof drain, measure the size of the drain ring. Here are the 5 methods to measure it. Have a look:
a) Measure the slots of the bolts across the drain ring at 180° directly if it is a- 4-bolt drain ring
b) Measure distance in between the bolt slots, as these tools go around the drain ring's inside part - 3- or 5-Bolt drain ring
c) Measure the distance in between the drain ring’s the inside edge of gravel stop at 180°. It will help you to get inside diameter.
d)Measure the distance in between the outside edges of the ring at 180 °. It will lead you to get the outside diameter. You can Include any flange that can extend beyond the gravel stop.
e) The Lug style drains are measured calculated like the bolt-style drains but, here you need to measure from the centre point of the pad’s dimple
3) Dimensions of the roof drains
See the mentioned measurements with the connection types that can also help you when you need to search for the right model.
a) Sump Bowl Size: It is shaped like a bowl underside of the roof drain. It helps in funnelling water into an outlet pipe. From this sump bowl to the opposite side, the most used and common sizes are - 8, 12 or 15 inches.
b) Diameter of the outlet: The drain outlet joins to the drain leader and the diameter of the standard outlet pipe typically is 2- 6, 8, 10 or 12 inches.
c) Type of the outlet connection: The common connection designs are -: iron pipe, no-hub, caulk and push-lock.
What are the steps for sizing roof drains on a building?
1) Determine 1-hour rainfall rate
2) Choose the number of roof drains and then calculate every drain's roof area that is sloped
3) You have to size the "vertical storm drainage piping".
Getting water out from the roof is vital and, for buying the correct roof drain it is necessary to keep all the above points in mind. An efficient roof drainage system with good quality roof drains can effectively prevent both short-term and long-term damage to your roof.
