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Can you install a new roof on top of an old one?

When it comes to metal roof installation, our team of roof plumbers in Melbourne get a lot of common questions.

A lot of these questions revolve around heat (not an issue) or noise (a non-issue nowadays).

Sometimes however, we get some more peculiar queries.

This can include prospects asking if it’s possible to install a new metal roof directly over an old one.

new metal roof

Yes, you can install a new metal roof directly on top of an old one… but it’s not a good idea!

And if someone says they can, then you need to speak to us!

We stand firmly against the idea of installing a new metal roof over an old one. 

At Watermaster Roofing, we strongly believe that installing a new metal roof over an old one isn’t the best course of action.

While it’s technically feasible to install a new metal roof over an old one, it’s a decision that comes with significant considerations and potential drawbacks.

We believe that a thoughtful and well-executed roofing project begins with a clean slate, ensuring the long-term durability and integrity of your home.

While it’s not entirely impossible, there are several reasons why we discourage this practice. These are three major compromising factors:

1) Structural integrity

Carrying out a metal roof installation on top of an existing one isn’t a straightforward process. It often requires additional steps to ensure structural integrity and prevent potential issues down the line.

2) Weight concerns

Metal roofing is favoured for its lighter weight compared to traditional options like tiles.

However, stacking two metal roofs on top of each other can strain the supporting structure of a house. This extra load may lead to unforeseen structural complications.

3) Regulatory hurdles

Different councils have varying regulations regarding roofing installations. Some may not permit the installation of a new roof over an old one, requiring the removal of the previous roof before a new one can be put in place.

Adhering to local regulations can be a minefield, but it’s crucial to avoid potential legal issues.

Metal roof replacement FAQ

Is it quicker to install a new roof over an old one?

While installing a new metal roof directly over an old one might seem like a shortcut to faster installation and cost savings, it’s important to remember that quality and durability are paramount.

The extra work (and therefore time) involved in ensuring a stable installation can often outweigh any perceived benefits.

Are there situations where installing a new roof over an old one is a good idea?

While it’s technically possible, our recommendation leans towards a clean slate. Starting fresh avoids potential complications that can arise from the added weight and structural considerations of installing over an existing roof.

Can installing over an old roof affect my new roof’s lifespan?

Yes, it can. Over time, issues from the existing roof can impact the new one. A thorough assessment and proper replacement on a clear surface ensure the new roof’s longevity and performance.

What’s the impact on insulation and energy efficiency when installing over an old roof?

Installing a new roof over an old one can affect insulation efficiency and ventilation. It’s preferable to start anew, allowing for proper insulation installation and maximising energy efficiency.

Can I maintain a warranty when installing over an old roof?

Warranty terms can vary, but some manufacturers may void warranties if new roofing is installed over an existing one. Starting with a clear surface may ensure your warranty remains valid.

roof plumbing

Want to speak to an expert about your re-roofing project?

At Watermaster Roofing, we strongly advise against the practice of placing a new metal roof over an existing one.

Instead, we recommend a comprehensive approach that includes removing the old roof to ensure a solid foundation for your new metal roof.

Your home deserves the highest level of quality workmanship and attention to detail.

For all your metal roofing needs in Melbourne, whether it’s a new installation, a re-roofing project, or help with gutters and roof plumbing, you can trust our team to deliver exceptional results.

For expert advice and impeccable metal roofing in Melbourne, contact Watermaster Roofing today.

Reach out to us at 1300 576 075 or visit our headquarters at 9/22 George St Sandringham, VIC 3191. Our dedicated team is here to help you make the right choices for your roofing needs.

2023-09-01T04:56:32+00:00 June 17th, 2020|Metal roofing, Roof Plumbing|

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