Are you wondering if you can roof over existing shingles? The simple answer is that yes, you can.
Can I put new roof shingles over old ones?
If conditions are right, new shingles laid over old ones can be just as attractive and durable as shingles laid on bare sheathing. Installation is easier than for a tear-off job, since you can use the existing shingles as guides for laying the new ones.
Is it OK to put a new roof on top of an old roof?
Most homeowners want to know if it is possible to put a new roof over an old one. The answer is Yes. You can put new shingles over existing shingles that are in good condition. However, you can only install new shingles over asphalt shingles that meet the re-roof conditions.
Is it okay to put two layers of shingles on a roof?
Most building codes allow up to two layers of organic or fiberglass asphalt shingles. That limit pertains to roofs with up to a 4:12 pitch. When it’s time to replace your roof, there are several factors that might lead your roofing professional to recommend adding shingles on top of your existing layers.
Can you roof over an existing shingle roof Related Questions
How long does a roof overlay last?
An overlay is a viable option if the existing roofing materials have not already been overlaid. Home Reference.net notes that on average you can expect the overlay to last for fifteen or sixteen years.
What is one of the drawbacks to adding a second layer of roofing over a first?
One drawback of adding a second layer of roofing over the first is the inability to inspect the roof decking for damage, potentially leading to undetected issues that could worsen over time.
What is the best time of year to Reshingle a roof?
Fall. Fall is the universal go-to season for roof replacement. With spring’s mild temperatures and early summer’s weather consistency, fall is commonly referred to as the best time of year to replace your roof.
What is the difference between roof overlay and tear off?
Roof tear off is when the entire old roof is removed completely, and the new roof is installed in its place with all new materials. Roof overlay is when your old, existing roof remains in place and the new roofing system is installed directly over top of it.
How many times can you replace shingles on a roof?
You should realistically get around 80-85% of the life span out of the asphalt shingles. This means you can expect to get around 20 years out of your 3-tab shingle roof and around 25 years out of your architectural shingles. On the other hand, luxury shingles are thicker and should get up to around 30 years.
Is it bad to overlay a roof?
An overlay roof will have a shorter lifespan than the average asphalt roof. Since an overlay roof is made up of two layers of shingles, it traps much more heat and is prone to issues that can occur between the two layers.
How many times can you go over a roof?
At maximum, you can safely layer up to two layers of organic or fiberglass asphalt shingles for roofs with up to an 18.5-degree pitch. Any more than two layers adds too much weight to your roof. Some local building codes don’t allow overlaying at all; in those municipalities, you can only have one layer of shingles.
What is the problem with the second layer of shingles?
More Problems Down the Road Decreased lifespan: A double-layer roof will not last as long as a single layer. Both roof layers will diminish much quicker due to the increased weight, heat, and moisture. Removal costs: When the time comes to replace your roof, having two layers will require more manual work.
Is a second layer roof a good idea?
Most roofers would agree that adding a second layer or even multiple layers of shingles to your roof is NOT a good idea and cuts back on the quality of the roof.
Why can’t you have more than 2 layers of shingles?
Warranty issues: Most shingle warranties do not apply when shingles are layered over existing roofing, according to InterNACHI. Two layers of shingles trap more heat, which in turn damages the shingles and shortens the life span of the roof.
Is overlaying shingles bad?
Overlaying shingles prevents roofers from properly installing water and ice leak barriers. If you live in an area with brutal winters or other environmental concerns, water leak barriers are essential as they ensure that ice doesn’t leak under the old shingles.
Are roof overs a good idea?
Mobile home roof overs prevent damage to a healthy roof. However, if your roof isn’t in great condition, installing a mobile home roof over is like putting a band-aid over a serious wound. It may be a quick fix, but it won’t solve the underlying issue.
How much does it cost to overlap a roof?
Align the first metal roofing panel so that it overlaps the edging by 1/2 to 3/4 of an inch and is square to the roof line. Be sure the larger edge is laid so that the small edge of the next panel will overlap it.
Is it acceptable to reroof an existing roof that already has two layers of roofing installed?
It is the process where roofers install a new roof over your existing one, i.e. add a new layer of shingles, which means that there is no tearing off of the old roof. It is important to know that this process can only be done once because you can only have two layers of shingles on your roof.
How many times can you stack shingles?
A typical bundle weighs 75-80 pounds, which can quickly lead to a lot of pressure if you stack them on top of each other. Another reason to avoid stacking too many is to not risk them toppling over and becoming damaged. If you are using asphalt composite shingles, 9 stacked bundles is probably the limit.
How long will a second layer of shingles last?
The short answer: Before the existing roof leaks. Lifespans vary according to the type of roof. For instance, three-tab asphalt shingles last around 25 years, while architectural shingles last up to 30 years. A wood shingle roof can last up to 30 years, but individual shingles may need replacing before that.