How to Install Roof Pipe Flashing

What You'll Need
Aluminum roofing nails
Aluminum flashing
Rain collar
Quick dry epoxy

One of the many important aspects to consider when making sure your house is waterproof is roof pipe flashing. It is essential that roof flashing be dealt with in a meticulous manner to ensure that no water leaks in through the roof. Ideally, the installation of roof flashing should be taken care of before the laying of any shingles etc that you may plan to use. Pipe flashing will stop any water from leaking into the joints between the roof and the pipe. The following systematic guide will conduct you through the installation of pipe roof flashing to ensure maximum protection. 

Step 1 - Choose the Material

Flashings are available in a variety of materials: copper, aluminum, lead, stainless steel, zinc etc. Copper is the best choice in terms of durability, but is one of the most expensive of materials and also difficult to install. Aluminum is the most common material used for roof flashings because it is durable, cheap and easy to install due to its softness and ability to hold shapes. In addition, aluminum sheets (easily available from hardware stores) offer the flexibility of choosing pre-cut sizes to fit your needs.  

Step 2 - Prepare the Flashing

The flashing should have a hole in it that is pre-cut according to the diameter of the pipe. If this is not the case, you can cut it yourself, but it is advised to have it cut when you buy it. Aluminum flashing is easier to cut so it will not take much time, however, you should be careful not to wound yourself. The hole in the flashing will be a bit smaller than the pipe diameter to prevent any leaks due to the space between the pipe and the flashing. Aluminum’s malleability will come in handy here too. Make sure you are wearing gloves at all times during the whole flashing process. 

Step 3 - Slide the Flashing

Slide the flashing over the pipe making sure that the flashing is closely sitting on the surface of the roof. As the hole in the flashing is slightly smaller than the pipe, you will be able to have a close fit around the pipe.  

Step 4 - Nail it in

Using your hammer, nail each side of the flashing to the roof so that it is securely fitted. Nails should always be of the same material as the flashing in order to avoid any reactions with opposing metals. Now, apply the quick dry epoxy, or any reliable sealant, to the nails. Cover them completely so the nail holes do not become passages for water seepage.  

Step 5 - Fix the Rain Collar

Slide the rain collar over the pipe and close to the flashing. Then, twist the screw to fasten the collar in place over the flashing. This will add a level of protection to your roof and give your flashing a longer life.  

Remember, safety first. Make sure that you take all necessary precautions to avoid any careless accidents.