When it comes to roofing, many homeowners wonder if they can just lay new asphalt shingles over the old ones. It seems like a handy way to reduce expenses and save time, but is it truly the best option? While placing new shingles on top of old ones is feasible, there are several factors to consider. Let’s examine the advantages and disadvantages so you can make the right decision for your roof and your home.
Understanding Roof Shingles
When homeowners consider residential roof installation, they may think about re-roofing by placing new shingles over old ones to save money and time. However, roofing companies usually suggest removing the old shingles first. This allows for an inspection of the roof sheathing and decking below, which could have issues like rot that might lead to future leaks. The underlayment, which shields the home from water damage, may also be compromised if not checked.
Multiple layers of old roofing can create uneven surfaces, impacting the adherence of new asphalt shingles. Furthermore, building codes often restrict the number of layers permitted, potentially leading to higher costs later if a complete tear-off becomes necessary. Home inspectors may raise concerns about houses with double-layer roofs, making buyers apprehensive about future expenses and repairs.
Selecting the right shingles means understanding how various styles and materials can affect performance and lifespan, while also recognizing common signs like curling or cracks in the existing shingles that suggest a roofing project is due.
Benefits of New Asphalt Shingles
When installing new asphalt shingles over old shingles, homeowners can benefit from reduced costs and quicker project completion. Skipping the tear-off stage allows roofing companies to start work immediately, saving time and money. However, it’s essential to ensure that the existing roofing is in good condition since damaged decking or underlayment can cause future issues.
While the option to re-roof may seem attractive, it could increase the weight on the roof structure and impact its overallstability. Asphalt shingles are effective at reflecting heat, which can help keep homes cooler and lower energy bills.
Additionally, modern asphalt shingles are built for greater durability and better resistance to severe weather, such as strong winds and heavy rain. Proper installation is recommended by contractors to prevent water from infiltrating under the shingles, safeguarding the home’s interior and the roof sheathing. Home inspectors also assess the condition of these materials during their evaluations.
Can You Put New Asphalt Shingles Over Old Ones?
Evaluating the Condition of Old Roof Shingles
When checking old shingles, individuals should look for signs such as curling, cracking, or missing pieces. These signs suggest that the old roofing may not provide adequate protection against water damage. Inspecting the current shingles allows contractors to identify potential leaks or damage that could affect the roof structure and home interior. During the inspection, they can also examine the roof decking and underlayment to confirm their condition.
Tools like binoculars or a ladder can assist in assessing the overall durability and lifespan of the roofing system, ensuring a thorough evaluation. Costs for roofing projects can increase if old shingles are not addressed, leading to higher expenses later on. Building codes might restrict the number of shingle layers permitted, making it necessary to evaluate the state of the old shingles before re-roofing.
Home inspectors frequently report on the state of residential roof installations, highlighting any issues that may need addressing to avoid future complications.
Potential Issues with the Shingle Over Method
When installing new asphalt shingles on top of old ones, significant structural concerns can arise. Adding another layer increases weight, potentially straining the roof structure beyond its capacity. This additional load can worsen damage to the roof sheathing and decking. The underlayment, which acts as a moisture barrier, may be deteriorated and go unchecked since contractors can’t properly inspect it without removing the old roofing. This can weaken the entire roofing system.
Regarding the lifespan and performance of the new roof installation, trapped water and growths like moss between the layers can compromise new shingles, leading to a shorter lifespan and reduced effectiveness in protecting the home. Code violations may also arise, as building codes often limit the number of shingle layers allowed. Homeowners must consider potential warranty issues too, as many roofing companies recommend removing existing shingles to maintain warranty validity for new shingles.
Requirements for the Shingle Over Method
Building Codes and Regulations
When considering home exterior services such as residential roof installation, following local building codes is important when deciding to put new asphalt shingles over existing ones. Many regions have rules that restrict the number of shingle layers allowed on a roof, often permitting only one or two layers. Homeowners who disregard these regulations may incur penalties, such as fines or the obligation to redo the work at their expense.
Contractors and roofing professionals usually suggest removing old shingles to ensure the roofing system is sound and that the underlayment and roof decking are in good condition. Putting new shingles over old ones can cause issues, as it hinders proper inspection of roof sheathing and may result in water damage due to deteriorated underlayment.
Additionally, this approach may seem less expensive and time-saving initially, but it could lead to higher costs and complications for future roofing projects, which raises concerns for home inspectors and prospective buyers.
Manufacturer Guidelines for New Roof Shingles
When installing new asphalt shingles over existing ones, homeowners should first assess the condition of their current shingles and the underlying roof structures, including the roof decking and underlayment. Roofing companies typically recommend removing old roofing to check the roof sheathing for any water damage. This step is important, as problems like soft spots or wear can remain hidden with a simple re-roofing.
Contractors advise that shingles should lie flat on a solid surface for optimal performance; uneven old shingles may hinder the installation of the new ones. Moreover, maintaining the warranty on new roof shingles often hinges on correct installation techniques, such as limiting layers to no more than two and ensuring compliance with local building codes. Home inspectors might flag installations that do not meet these standards, potentially impacting future repair costs and projects. A comprehensive evaluation can help homeowners avoid more costly repairs later.
Alternatives to Using the Shingle Over Method
Complete Roof Replacement
When choosing home exterior services for asphalt shingles, factors like the state of the old shingles and the overall integrity of the roofing system are important. Contractors usually recommend a complete roof replacement to ensure proper inspection of the underlayment and roof decking, as keeping the old shingles can conceal damage to the roof sheathing.
Although homeowners might consider re-roofing to save money and time, this choice can result in higher costs later when both layers require removal. A full replacement boosts the home’s value and performance by ensuring a strong roof structure that effectively prevents water infiltration. The standard steps in a complete roof job include removing the current shingles, checking the roof decking for soft spots, and installing new roof shingles for long-lasting protection. Building codes may impact this decision, as some areas limit the number of layers permitted, making it important for homeowners to consult with a roofing company.
Home inspectors often assess these factors, and any signs of poor workmanship can deter potential buyers when selling the property.
Benefits of Installing a New Roof
Installing new shingles over old shingles can initially save money and reduce project time by skipping the tear-off process. However, it may not address deeper issues like deteriorated underlayment or roof decking that can threaten the overall roofing system. Roofing companies often recommend tearing off old roofing to inspect roof sheathing for any soft or rotting spots. If water gets through old shingles, it can damage the new ones.
A new asphalt roof can significantly improve energy efficiency by properly sealing the home and preventing leaks, leading to long-term savings on energy bills.
Cost Considerations
Cost of New Roof Shingles
When homeowners consider installing new asphalt shingles, several factors influence the overall cost. One major consideration is whether to re-roof by installing new shingles over old shingles or to do a complete tear off. While skipping the tear off may save money and time initially, the roofing company often recommends a full removal to inspect the roof decking and underlayment. This inspection ensures there are no issues with the roof structure.
Ignoring this can lead to more expensive repairs later if the current shingles have problems, like moss or soft spots in the roof sheathing.
Additionally, the project’s cost can increase if the building codes in the area limit the layers allowed or if local contractors need to dispose of extra materials from multiple layers. Home inspectors may also flag double layers during home evaluations, which could deter potential buyers in the future.
Long-Term Financial Implications
Considering long-term financial implications, investing in new asphalt shingles rather than maintaining old shingles can lead to better outcomes. Over time, opting for a full roof replacement instead of a re-roofing project saves homeowners from the costly process of tearing off multiple layers later. Contractors often recommend removing old roofing to ensure a solid foundation.
If roof decking or underlayment shows signs of wear, leaving old shingles can lead to water damage, increasing futurerepair expenses. This also affects the roof structure, risking sagging and the need for costly fixes.
Additionally, new shingles often improve energy efficiency, reducing utility bills in the long run. While the upfront cost of a roofing job might seem high, homeowners might find that investing in a quality installation pays off by avoiding expensive repairs down the road, keeping maintenance needs in check, and possibly enhancing property resale value. Home inspectors note these advantages, making proper roofing decisions important for home exterior services and overall affordability.
FAQ
Is it permissible to install new asphalt shingles over existing ones?
Yes, it’s permissible to install new asphalt shingles over existing ones if there is only one layer already. Ensure the current roof is in good condition, and use a starter strip and proper underlayment. However, check local building codes for specific regulations.
What are the benefits of putting new shingles over old shingles?
Adding new shingles over old ones can save on labor and disposal costs, reduce time for installation, and provide additional insulation. For example, you can improve energy efficiency and cut down on noise with thicker shingle layers, while keeping your roof’s existing structure intact.
Are there any downsides to layering asphalt shingles?
Yes, downsides include increased weight, which can strain the roof structure, and reduced lifespan due to heat retention. Instead of layering, consider replacing old shingles. If you layer, ensure your roof can support the extra weight, and use high-quality shingles to mitigate potential issues.
How many layers of asphalt shingles can a roof safely support?
Most roofs can safely support one layer of asphalt shingles, while some can handle two layers if they are in good condition. It’s best to check with a roofing professional for your specific roof’s capability before adding layers.
Will putting new shingles over old ones void the warranty?
Yes, installing new shingles over old ones can void the warranty. Always check with the manufacturer for specific requirements. For example, some warranties require a complete tear-off of old shingles. To ensure coverage, it’s best to remove old shingles before installing new ones.
