Roof Drain Direction

Since water tends to collect in the center of the roof this can be an effective means of eliminating it.

Roof drain direction. As water drains down the steep slope at the wye it can create a siphon effect such that water will be sucked out of the trap. An interior drainage system makes use of several drains spaced across the surface of the roof most commonly near its center. Each drain is connected to an unseen system of pipes or gutters beneath the surface of the roof. Roof drains must be firmly secured to the roof with an underdeck clamp otherwise due to snow loads rain loads and reg ular expansion and contraction the drain will work in and out of the roofing causing roofing membranes to flex and fail.

The drain is typically placed along the edge of the roof but it can be placed anywhere that you think it will do the most good. For a large roof it is recommended to have drains placed at multiple locations within the area of the roof. Inner drains are found many times on large building roofs. Connecting a trap to a vertical drain with a wye fitting and a 45 degree elbow seems like a good idea.

This will cause heavy drainage issues from your gutters and downspouts. The drains are usually placed near the center of the building. Or smaller in size have the ability to flow more water to the piping than the piping can handle using 33 for the vertical and full flow for the horizontal. These drains are distinguished by having higher rims.

And the empty trap will allow sewer gas to flow into your home. As we will see in steps 3 4 the size of the roof drain lines is dependent on the square feet of the roof area being served by each roof drain. Residential homes may also have this type of commercial roof installed. Where you place your flat roof drain is very important.

They attach to pipes that drain the water down through the building s roof. The drainage system of any roof can be located at the edge or in the middle of the roof. In addition to the primary roof drains there will also be overflow drains which are used for redundancy and sized in the same manner. Scuppers are open holes or channels cut into the roof edge or parapet.

The flow through the roof drain is very efficient directing the water into the drain. The most logical place to put the drain is at the lowest area of the roof. Scuppers are commonly used on flat roofs that have a parapet or other type of perimeter barrier enclosing the roof. The roof is sloped toward the scuppers and water simply drains out through the scuppers.

The end result is roof drains 6 in.