Renovation Store in Kanagawa Prefecture, Yokohama | What is Roof Overlay (Roof Cover Method)?
Hello!
This is Yamanaka from Kakeru Koumuten Co., Ltd., a specialist in exterior renovations located in Aoba-ku, Yokohama, Kanagawa Prefecture!
Here, we provide information about the roof overlay (cover method) offered by Kakeru Koumuten. Please take a moment to read through it for your reference!
Roof Overlay (Cover Method)
The roof overlay (cover method) involves leaving the current roof almost intact and placing a new roof on top of it, effectively covering it.
As the name suggests, it is a method of covering a roof with another roof. Therefore, the roof becomes double-layered. Since the roof is installed over the existing one, it is also referred to as “overlapping roofing.”
Advantages of the Overlay Method
Since a “new roof” is placed over the “current roof,” demolition work is almost unnecessary, meaning that very little waste material is produced.
This is its most significant feature, leading to various advantages.
The only parts that require demolition and waste disposal are typically the ridge cap, making it more cost-effective compared to complete roof replacement.
In 2004, regulations regarding the concentration of asbestos in raw materials were changed (for more details, please refer to the Ministry of Health, Labour and Welfare website).
Building materials used in constructions completed before 2004 may contain asbestos. Asbestos-containing materials are difficult to demolish due to their high environmental impact, resulting in high costs for both demolition and waste disposal. The overlay method, which produces almost no waste, is ideal for such roofs.
You may be wondering, “Is it safe to live in a building that uses asbestos-containing materials?” Rest assured, as long as there is no destruction or crushing, it will not disperse into the air.
If you are unsure about the type of roof on your home, please feel free to consult us.
Additionally, the construction can be completed in a shorter time frame compared to painting or complete roof replacement. A shorter construction period means lower labor costs, which in turn makes the overall cost more affordable.
This also reduces the psychological anxiety of having to live in an unusual environment.
If scaffolding is set up, you may experience inconveniences such as difficulty entering and exiting or being unable to open windows. Being able to return to your normal life in a short period is a significant advantage.
Unfortunately, there are also disadvantages to the overlay method.
Tile roofs are not suitable for the overlay method.
For typical residential roofs, metal and slate (color best, colonial) are suitable for the overlay method, but tile roofs are not. Additionally, installing solar panels becomes more challenging. While it is not impossible to work with tile roofs or solar panels, it is often more cost-effective and easier to handle through other construction methods.
Please feel free to contact us for details on which roofs are suitable or unsuitable for the overlay method.
Depending on the condition of the roof’s deterioration, it may not be possible to carry out the construction.
If the underlying structure of the roof is deteriorated, it must be repaired. If you proceed with the roof overlay method without repairs, it will be left as is, and in such situations, the overlay method cannot be performed.
Construction Process (Roof Overlay Method)
1. Demolition of Existing Roof Ridge
Remove unnecessary ridge flashing for the overlay method.
2. Installation of Roofing (Waterproof Sheet)
Install a waterproof paper called asphalt roofing over the original roof.
※The photo shows adhesive roofing. It is Tajima Roofing’s Tadi Self.
3. Main Construction
New roofing materials will be installed.
4. Installation of Purlins
Once the roofing materials are installed, purlins will be installed. There are also resin purlins that are resistant to corrosion, which we recommend.
5. Installation of Ridge Flashing
After the installation of the purlins, the ridge flashing will be installed.
6. Caulking Treatment
Caulking treatment will be performed to prevent moisture from entering through the seams of the metal.
7. Completion of Roof Overlay Method
As you can see, the roof overlay (cover method) has fewer processes compared to a roof replacement project.
This not only shortens the construction period but also has the advantage of saving on costs such as waste removal!
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