Can you install a metal roof over existing shingles, or do the old shingles need to come off first?
When replacing a shingle roof with a metal roofing system, this is one of the most common questions homeowners have. In some situations, metal roofing can be installed over an existing layer of shingles, potentially reducing the amount of old roofing material that needs to be removed.
However, installing metal roofing over shingles isn’t automatically the right solution for every home.
The condition of the existing roof and roof decking is an important factor. If the decking underneath is damaged or rotting, simply covering it with a new metal roof won’t solve the underlying problem. Those areas need to be identified and addressed before the new roofing system is installed.
A full roof tear-off can also provide the installer with direct access to the roof deck, making it easier to inspect the entire surface and identify problems that may be hidden beneath the existing shingles.
Other factors can include:
The condition of the existing shingles
The number of roofing layers already installed
The condition of the roof decking Local building requirements
The specific metal roofing system being installed
Ultimately, there isn’t one answer that applies to every home. The existing roof should be evaluated first so you can determine whether installing metal roofing over the current roof makes sense or whether removing the old material is the better approach.
Thinking about replacing your shingle roof with metal? Get the existing roof evaluated before deciding on a tear-off or overlay.
Timestamps
00:00 Can You Install a Metal Roof Over Shingles?
00:28 Why Damaged Roof Decking Matters
01:23 How to Decide Between Overlay and Tear-Off
Thinking about replacing your shingle roof with metal? Contact Gator Metal Roofing for a professional roof evaluation and find out which option is right for your home.
When you’re replacing a shingle roof with metal, one question that often comes up is, do the old shingles have to come off first?
In some cases, a metal roofing system can be installed over an existing layer of shingles.
That can reduce the amount of material that has to be removed from the home before the new roof goes on.
But that doesn’t mean installing over shingles is the right choice for every house.
The condition of the existing roof matters. If there’s damaged or rotting decking underneath, covering the roof doesn’t fix that problem.
Those areas need to be identified and addressed before the new roofing system is installed.
A full tear off gives the installer direct access to the roof deck.
That makes it easier to inspect the entire surface and find problems that may have been hidden underneath the old shingles.
There are other factors to consider too, including how many roofing layers are already on the home and what local building requirements allow.
So there isn’t one answer that applies to every roof.
The important thing is having the existing roof evaluated first.
From there, you can determine whether installing metal over the current roof makes sense or whether removing the old material is the better approach.
That decision should be based on the condition of your home, not simply which one is faster.
