Roofing

Use These Methods to Waterproof a Corrugated Iron Roof

Corrugated iron roofing is a great choice for many homes because it is lightweight, cheap and lasts for decades when properly maintained. Unfortunately, corrugated iron isn’t waterproof. It will rust if left exposed to the elements, which means it will need frequent maintenance to remain in good condition. 

An un-waterproofed corrugated iron roof will also trap moisture and cause condensation problems inside the home. To prevent these issues from occurring, you must waterproof your corrugated iron roof as soon as possible after installing it. In this article, we’ll give you tips on how to waterproof a corrugated iron roof with ease and without an expensive contractor.

How do you know if a corrugated iron roof needs waterproofing?

Waterproofing a corrugated iron roof is a critical step that many people overlook. If you don’t waterproof your corrugated iron roof, you are inviting long-term problems and expensive repairs. It is easy to determine if your corrugated iron roof needs waterproofing.

You can also test for waterproofing issues by spraying water on the corrugated iron. If water soaks into the iron, it is not properly waterproofed and needs to be remedied right away. Corrugated iron is designed to protect against light rainfall, but is not designed to withstand heavy downpours. A properly waterproofed roof will repel water and keep it off the iron.

Use caulk to seal joints.

The first step in waterproofing a corrugated iron roof is sealing the joints. The joints on a corrugated iron roof are where rust and leaks are most likely to occur, so sealing them is critical. To seal the joints, use high-quality roofing caulk and a caulking gun. Start at the bottom of the roof and work your way up, making sure to overlap the joints as you go. Make sure the roofing caulk is a color that matches the color of your corrugated iron to prevent it from being noticeable.

Apply waterproof sealant with a sprayer.

Adding a coating of waterproof sealant to the roof will greatly improve its water resistance and prevent rust. You can apply sealant using a sprayer or roller. If you use a sprayer, you will apply a thinner coat of sealant  than if you use a roller. For best results, apply a 2-3 mm (0.08-0.12 in) coat of waterproof sealant. Make sure to wear gloves, eye protection, and an air respirator when applying sealant. 

Protect the bottom of the roof with paint.

The bottom of the corrugated iron roof is often overlooked, but it must be waterproofed just like the top of the roof. The easiest way to do this is to paint the bottom of the roof with a high-quality colored waterproof sealant (we suggest using this one). You can use a brush or roller to apply the paint. It is best to use a paint that is formulated for metal like epoxy-coated iron paint.

Conclusion

Corrugated iron roofing is a great choice for many homes. It is lightweight, cheap, and lasts for decades when properly maintained. However, corrugated iron isn’t waterproof. If left exposed to the elements, it will rust and need frequent maintenance.

An un-waterproofed corrugated iron roof will trap moisture and cause condensation problems inside the home. To prevent these issues from occurring, you must waterproof your corrugated iron roof as soon as possible after installing it. Roofing sealants and liquid rubber membrane are the best ways to do this.

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