Why is My Metal Roof Leaking?

Do you think you have a leak in your roof? Check out these 9 things that may be causing your roof to leak.

Why is my roof leaking

There are a number of reasons a roof could be leaking and it needs repair.  A few reasons below:

1. Rusty screws?

Rusted roof screws

Sometimes you’ll find that screws on the roof have rusted out or the rubber seals at the bottom of the screw have deteriorated and need replacing.

2. Rusty vent caps

A rusted metal roof vent

Over time it’s not uncommon for the tops of steel roof vents to rust out, or for the vertical piping of a roof vent to rust.  When this occurs the metal can begin to flake and crack opening up holes for water to leak through.  If water is leaking down through say a ceiling vent of a ceiling fan then it’s highly likely that your roof flue has a leak.

3. Silicon deterioration

Although silicon is considered very durable, under harsh conditions and over a long period of time silicon can deteriorate and eventually crack or flake.  Cracks in the silicon can then allow water to seep through causing leaks in your roof.

As you can in the photo above light is shining through the silicon around this roof vent. If this silicon was to break up or deteriorate over time water would start entering the roof space.

4. Air conditioning flashing

A common area where leaks occur is around the base of where rooftop air conditioning protrudes from the roof.  If you suspect there is a leak around the air conditioning unit it’s worthwhile checking the metal or lead flashing around the base of the unit.

Roof flashings around an air conditioning unit

In particular, check at the back of the unit where the water comes down the roof and deflects off the unit.  It’s at the back where the water will usually pool up and either go back up under the roof or soak down through a hole in the silicon.

5. Pitch of roofs

Often the pitch of the roof can be too lower or under the recommended pitch level for your roof type.  If you use tiles water can often blow up under the tiles or if its metal roof sheets it has been known for the water to run under the lip of the sheet and into the roof space. 

Therefore it’s important to ensure that your pitch is above recommended guidelines and that if you are running a low pitch roof that you turn down the end of your sheets so any water drips directly into the gutter.

6. Sheets not turned up?

If you have colorbond metal roof sheeting the top of the roof sheets need to be turned up to stop the water from blowing up under the ridge caps and into your roof space. Therefore, if you notice that the water is entering around your ridges this could be your cause.

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