Cedar shakes are a popular choice for roofing due to their natural beauty and durability. If you are considering installing cedar shakes on your roof, one question you may have is whether you can install them over existing shingles. In this article, we will explore the factors to consider and the steps involved in installing cedar shakes over existing shingles.
Factors to Consider
Before deciding to install cedar shakes over existing shingles, there are some important factors to consider:
- Weight: Cedar shakes are heavier than shingles, so you need to ensure that your roof structure can support the additional weight. It is crucial to consult with a structural engineer or a roofing contractor to evaluate the load-bearing capacity of your roof.
- Roof Condition: The condition of the existing shingles matters. If the shingles are damaged or worn out, it is not advisable to install cedar shakes over them. The new shakes will not provide a proper base and may compromise the integrity of the roof.
- Building Codes: Check your local building codes and regulations to determine if installing cedar shakes over existing shingles is allowed. Some areas might require a complete tear-off of the existing roof before installing cedar shakes.
Steps to Install Cedar Shakes Over Existing Shingles
If you have carefully considered the factors mentioned above and have decided to go ahead with installing cedar shakes over existing shingles, here are the steps involved:
1. Inspection and Preparation
Begin by thoroughly inspecting the existing shingles. Look for any signs of damage, such as curling, cracking, or missing shingles. If there are any issues, it is recommended to remove the old shingles before proceeding. Otherwise, proceed to clean the existing shingles of any debris or dirt.
2. Installation of Underlayment
It is essential to provide a proper base for the cedar shakes. Install an underlayment, such as roofing felt or synthetic underlayment, over the existing shingles. This underlayment will act as a moisture barrier and provide an even surface for the cedar shakes. Follow the manufacturer’s instructions for the installation.
3. Cedar Shake Installation
Once the underlayment is in place, you can begin installing the cedar shakes. Start from the bottom edge and work your way up the roof. The shakes should be installed according to the manufacturer’s guidelines, ensuring proper alignment, spacing, and fastening. Use corrosion-resistant nails or staples to secure the shakes.
4. Flashing and Ventilation
Pay close attention to flashing details around chimneys, skylights, and other roof penetrations. Proper flashing installation is crucial to prevent water leaks. Additionally, ensure that sufficient ventilation is provided to prevent moisture buildup in the roof space, which can lead to issues like mold and rot.
5. Maintenance and Regular Inspections
Proper maintenance is crucial for the longevity of cedar shakes. Regularly inspect the roof for any signs of damage or wear and address any issues promptly. Clean the roof periodically to remove debris and prevent the growth of moss or algae.
While it is possible to install cedar shakes over existing shingles, several factors need to be considered before making the decision. Ensure that the roof structure can handle the additional weight, the existing shingles are in good condition, and it is allowed by local building codes. If you decide to proceed, follow the proper steps for inspection, preparation, underlayment installation, cedar shake installation, and adequate flashing and ventilation. With regular maintenance and inspections, your cedar shake roof can provide lasting beauty and protection for years to come.