How To Install a Roof Safely

Due to unfavorable weather, snow, or defective ventilation systems, your roof may deteriorate or may suffer damages. Excessive rain and the resultant pooling of the water are some of the sources of roof expansion, contraction, or rotting. Here are some tips that you need to know about Roof Drain Installation to avoid the depreciation of your roof. You can eliminate roofing demolition by introducing effective roof drainage systems. Proper planning is crucial for construction projects so that your money and time don’t go down the drain (no pun intended). Having equitable tools and materials make this process quite easy as well. 

Drain installation varies for different roofers in Albuquerque. In the case of a flat roof, install the drain on the actual rooftop and then link the drains. Whereas in the case of a low slope roof, this system of linking the drains may not work as it makes the water flow into the sewer system. When selecting a roof drain system, you have to consider various factors such as roof construction type, roof size, pitch, drain location, drainage rate, load requirement, safety load, and expected rainfall volume. For successful flat roof drain installation, you must follow the following basic steps.                                                                      

  • Find low spots on a flat roof
  • Analysis of particulars for roof drain installation
  • Choose a side or bottom passage for roof draining.
  • Consider installing roof drains that fit your space.
  • Select appropriate drain pan.
  • Roof drain installation procedure.
  • Plumbing and piping.

This article will discuss the above factors to install a deck-mounted flat roof drain system. You can implement this method if you are planning to build a drain system on new construction or want to replace the drain on an existing flat roof.

1. Finding Low Spots on a Flat Roof

You can easily find low spots on your roof as debris settles there and causes the area to discolor. You may mark the low spot by placing bricks or can mark them o that they are easily identifiable after the rooftop gets dry. You can pour some water on your dry roof and examine the direction of water flow. Water will flow towards the lowest spot on the rooftop. You can also use a tennis ball that rolls out to the bottommost place; to find the deficient site.

2. Analysis of Particulars for Roof Drain Installation

For facts analysis, firstly, determine the distance and direction of your roof beams. They are 16″ or 24″ in the wood-framed roof. Rafters are farther apart in steel and concrete roofs. You may analyze it by

  • Finding blueprints.
  • Making a test hole.
  • Making an educated guess.
  • Looking in attic space if it’s not open beam ceiling.

3. Choose A Side Or Bottom Passage Roof Drain.

The process of choosing a side or bottom passage of roof drain is critical. You have to measure the vertical distance between the ceiling and the roof. While doing so, you must consider attic space, open beam, closed beam, or limited space. Usually, we use the bottom outlet drain for apartments and restaurants. You may choose a side outlet roof drain if you have minimal space between the roof and the ceiling. In the case of the open beam, you may go for the bottom outlet roof drain.

4. Consider Installing Roof Drains That Fit Your Space

Use a small diameter (8-1/2″) bottom outlet roof drain if you have 13″ of vertical space, and your beams are 16″ far apart. If you have vertical space of 13″ or more and rafters are 24″ apart, then opt for a bottom outlet roof drain having 12″ or 15″ diameter.

If you have 8″ of vertical space and rafters are 16″ far apart, you may use a side outlet roof drain having an 8-1/2″ diameter. You may go for a 12″ or 15″ side outlet roof drain; if you have 8″ or 10″ vertical space and your beams are 24″ far apart.

5. Select Drain Pan

This step is crucial because selecting the wrong roof drain pan may leave you in tremendous trouble. While selecting drain pan, you must know about:

  • Sump receiver
  • Deck plate
  • Roof drain sump pan

We use a sump receiver for thick or insulated roofs where insulation is usually one or two inches. The deck plate is also suitable for thick rooftops, but it doesn’t need an under deck clamp while the sump receiver needs it. Here deck plate is directly fastened to the roof drain. It makes the roof drain installation process quick and easy. The roof drain sump pan is suitable for all types of roof thicknesses.

6. Roof Drain Installation Procedure

The installation procedure consists of the following steps:

  • To receive the sump receiver cut a big hole in the flat roof.
  • Attach both the roof drain pan and roof drain. Then make the association between the sump section and the flat roof.
  • Fix the pulley tightly with screws.
  • Blocking your roof drain may help prevent deflection as it provides support.

7. Plumbing and Piping

You must hire engineers for roof drain designing. They may help you prevent any damage to your property, protect electrical wiring, and save your maintenance cost through their unique plumbing techniques. Engineers will review the plumbing and piping settings and will suggest changes if required.

Importance of Roof Drain Installation

Proper drainage helps transport rainwater quickly and safely away from your roof. Water may follow gravity in pitched roofs, but in the case of flat roofs, gravity won’t work. We require proper drainage installation for flat roofs. A slight pitch on flat roofs makes the drainage successful. 

Architects and engineers also consider the water weight factor, which adds a considerable burden on the building. If it is left unchecked, it may result in collapse or damage to the roof. Standing water in depressions of the rooftop may cause the demolition of your structure. Concrete and wood may sink due to water load and compressing of the insulation. This condition may worsen, and more water will accumulate on the roof.


Protect your building from the damaging effects of rainwater, snow, or other poor ventilating systems. It would help if you scrutinized constructing a proper roof drainage system. For this, you must have a do’s and don’ts guide for roof drain installation. You should hire an engineer to overlook this matter.