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Can you install a new metal 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 out-there queries.

For example, you’d be surprised how many people ask whether it’s possible to install a new metal roof directly over an old one.

You may be chuckling to yourself. “Who would ask something like that? Of course reroofing requires you to strip the old one first.”

Yeah, about that… we think the following information might surprise you!

new metal roof

Yes, you can install a new metal roof directly on top of an old one!

We’re going to come right out and say it: installing a new metal roof directly over an old one isn’t our preferred way of going about it.

That said, it isn’t impossible, and there may be some instances where it’s an appropriate option!

As part of metal reroofing, your new metal roof can be installed either after removing the existing roof, or directly on top of the existing roof.

OK – so it isn’t quite that simple. In some cases, we may have to do extra work (more on that later). That said, it is indeed possible.

Now, why would we do something like that?

Faster installation

Let’s get the big one out of the way: yes, installing a new metal roof directly on top of an existing one will dramatically speed up your roofing job.

Yes, metal roofing installation is dramatically faster than other types of roofing. However, that doesn’t mean that it can’t be even faster!

Installing your metal roof directly on top of your existing one cuts out a lot of work – instead of having to dismantle the old roof first, we can immediately get started on installing your metal roof and be finished sooner.

Lower costs

Being able to complete your new metal roofing installation sooner doesn’t just save you time – it also saves you money too!

Less time spent on-site means lower labour costs. And that in turn directly translates into a reduced cost for your roofing project.

What’s more, it’ll also save you the cost of disposal as well. While metal roofing is 100% recyclable, we still need to pay for a skip and transport, among other fees!

Less disruption

With traditional roofing installation, we need to remove your current roof. While we’ll cover up with a temporary cover, you’re still going to be exposed to the weather.

Metal roofing replacement – or any sort of roofing job, really – can be extremely disruptive.

Many of our clients resort to (temporarily) moving out while our roof plumbing team works on their metal roofing installation.

While there’s no way to avoid metal roofing disrupting your life in one way or another, when you install on top of an existing roof, at least you won’t have to move out completely.

By installing on top of an existing roof however, you won’t have to resort to such drastic measures.

roof plumbing


Your roof is pretty darn important – little wonder that some of the clients who request metal roofing installation on top of their current one do so because they want the extra layer of security!

While your current roof may be starting to show its age, it’s still strong enough to work as a “back-up” layer to your new roof, offering an extra layer just in case the worst happens.

Can new metal roofing be installed on top of my current one?

It depends!

Just because it’s possible doesn’t mean that it’s always the best option, or even feasible.

Whether or not we’ll be able to install your new metal roof on top of your existing one depends on a range of factors…

The amount of work that needs to be done

Carrying out metal roofing installation on top of an existing roof isn’t as simple as just nailing metal roofing sheets onto your existing roof.

In many cases it involves extra work:

  • Special fastening techniques
  • Purlins to separate old and new roofs
  • Installing additional vapour barriers

Sometimes, the amount of extra work we need to do to get this to work simply isn’t worth the effort, and can even cost you more than getting your old roof removed first.

Your home

One of the reasons that metal roofing installation is so popular? Its lower weight.

Not only does it make metal much more flexible than other roofing choices, but it also makes metal the ideal choice for homes where the frame may not be able to take the extra weight of tile.

For these homes, the weight of holding up two metal roofs at once can be too much, and the added weight can present all manner of structural problems.

Council regulations

Some councils may not look too kindly upon this particular breed of metal reroofing, and may require you to uninstall your previous roof before any new roof is installed.

Depending on your council’s regulations, you may not even be allowed to do this, and may find that your planning permit is rejected outright!

It all depends on what you need: call Watermaster Roofing for metal roofing installation in Melbourne

Your home may be able to get its new metal roof installed over your current one – you may not. It all depends.

The only way to know for sure is to get in touch with a metal roofing team.

Our roof plumbers in Melbourne don’t just look after gutters and roof plumbing – we’re also  experts in metal roofing installation.

From new metal roofing installation to reroofing projects, our team has done it all.

And that includes jobs that involve installing a new metal roof on top of an existing one.

Cap your home off with the roof it deserves – call Watermaster Roofing for metal roofing installation and reroofing in Melbourne on 1300 576 075 or click here to get in touch online.

You can also visit us for metal roofing in Melbourne: pop into our headquarters at 9/22 George St Sandringham, VIC 3191, if you prefer a more hands-on approach.

2022-05-25T09:03:32+00:00 June 17th, 2020|Metal roofing, Roof Plumbing|

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