Sofia Martinez
Roof tile underlayment is an important layer of protection installed between the roof deck and the exterior roofing tiles. It creates a water-resistant barrier that prevents leaks in the event of cracked or broken tiles. There are two main types of underlayment: asphalt felt and synthetic. Synthetic underlayment is made from plastics like polyethylene or polypropylene, which offer superior strength, elasticity, durability, and waterproofing. While synthetic underlayment is more expensive, it provides better protection and is easier to install without causing damage. When considering how to replace the underlayment, it is important to weigh the costs and benefits of different options, such as simply replacing the underlayment, removing old tiles and replacing them with new ones, or even installing a solar roof.
| Characteristics | Values |
|---|---|
| Material | Synthetic underlayment made from plastics like polyethylene or polypropylene |
| Properties | Superior strength, elasticity, durability, and waterproofing |
| Resistance | Fungi, moisture, hail, and other debris |
| Installation | Easier to install without causing damage to the underlayment |
| Cost | Expensive |
| Alternative | Asphalt felt underlayment |
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What You'll Learn
Cost of replacing plastic underlayment
The cost of replacing plastic underlayment, or roof underlayment, depends on several factors, including the type of roof, the size of the roof, the pitch or complexity of the roof, the type of underlayment material, and labour costs.
The size of the roof is a significant factor in determining the total cost of roof underlayment replacement, as many roofers charge by the square foot. Larger roofs require more material and labour to install. On average, replacing roof underlayment costs $1.60 per square foot, with prices ranging from $0.60 to $2.70 per square foot.
The type of roof will determine the best type of underlayment for your home, which will impact the total cost. For example, asphalt roof underlayment is typically roofing felt, which is inexpensive and costs around $1,700. Tile roof underlayment replacement is more expensive, costing closer to $4,200 because synthetic underlayments are better suited for tile roofs. Synthetic underlayment costs $0.30 to $0.70 per square foot, while felt underlayment, the most budget-friendly option, costs $0.20 to $0.60 per square foot. Rubber underlayment is the most expensive option, ranging from $0.30 to $0.90 per square foot, but it is the only true waterproof underlayment.
The pitch or complexity of the roof can also increase the cost of replacing roof underlayment. Steeper roofs have larger surface areas, requiring more material and labour, and they are more challenging and dangerous to work on, so labour costs may be higher. Complex roof designs with multiple angles, valleys, or dormers can increase the difficulty of installation, leading to higher labour costs.
Labour will make up a substantial portion of the total cost of replacing roof underlayment, typically accounting for between 80% and 90% of the total cost. Labour costs include removing the old roof and underlayment, which can range from $1,000 to $5,000, and reinstalling tiles, which can cost $6,500. The cost of labour can vary depending on the location, with prices higher in states with a higher cost of living and in major cities.
The national average cost to replace roof underlayment is $800 to $1,200 for a 2,000 sq. ft. roof, with most people paying around $900. However, the cost can be as high as $6,000 to $10,000 for a 2,000 sq. ft. tile roof, including removing shingles and reinstalling tiles. The cost of replacing roof underlayment can range from $300 to $8,200, or even up to $40,000 in some cases, depending on various factors.
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Synthetic underlayment options
Synthetic underlayment is a layer of laminated polypropylene or polyethylene plastic material that is placed over the roof deck to provide an extra layer of protection. It is a popular choice due to its many benefits over traditional roofing felt. Firstly, synthetic underlayment is resistant to moisture and can be left exposed to the elements for extended periods, making it ideal for drying in a roof. It also has a longer lifespan compared to felt or asphalt roofing underlayment and does not get stiff or retain its curl in cold temperatures like roofing felt. Additionally, synthetic underlayment provides improved walkability, especially when it gets wet, making it a safer option for roofing contractors. The larger roll sizes of synthetic underlayment also mean that a roof can be covered faster, requiring fewer trips to fetch additional products.
When choosing a synthetic underlayment, it is important to consider the lifespan of the product and whether it is non-adhesive or self-adhesive. The price of synthetic underlayment will typically vary depending on these factors. For example, a 25-year non-adhesive underlayment may cost $.15 to $.20 per square foot, while a 50-year self-adhesive underlayment may cost $.55 to $.65 per square foot. It is also important to ensure that the lifespan of the synthetic underlayment matches the longevity of the roofing materials. For instance, if you have a metal roof designed to last 50 years or more, you should choose an underlayment with a matching 50-year warranty.
Some specific examples of synthetic underlayment products include Sharkskin Comp®, Sharkskin Ultra SA®, and Sharkskin Ultra. Sharkskin Comp® is a high-temperature-rated non-adhesive synthetic roofing underlayment suitable for metal and shingle roofing. Sharkskin Ultra SA® and Sharkskin Ultra are also high-quality options known for their durability and longevity. These products can be fastened with capped nails to ensure they remain securely in place, especially if left exposed during the installation process.
It is worth noting that synthetic underlayment typically has a lower perm rating than roofing felt, which means that proper attic ventilation is crucial to prevent moisture buildup in the attic. However, synthetic underlayment offers superior protection, longer lifespans, and improved ease of installation, making it a preferred choice for many roofing professionals and homeowners alike.
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Advantages of synthetic over felt underlayment
While felt underlayment is a more traditional and cost-effective option, synthetic underlayment offers several advantages in terms of durability, moisture resistance, and ease of installation.
Synthetic underlayment is made from high-tech materials such as polypropylene, polyethylene, polyester, or fiberglass, which provide strength and longevity. It is typically moisture-resistant and, when installed correctly, offers better protection from harsh weather conditions than felt. Synthetic underlayment is less prone to wrinkling and cracking, making it ideal for areas with high wind exposure. It is also more resistant to UV rays, with some types offering UV resistance for up to six months. This extended UV exposure tolerance is especially beneficial when a roofing project cannot be completed immediately.
The lightweight nature of synthetic underlayment makes it more manageable for roofers, reducing physical strain and promoting a quicker, more efficient installation. The lighter weight also puts less pressure on the roof deck, improving the roofing system's overall strength and lifespan. Additionally, synthetic underlayment is highly resistant to tearing and can better withstand harsh weather conditions, including heavy rain, strong winds, and intense temperatures.
In terms of moisture management, synthetic underlayment does not absorb moisture, reducing the risk of mold growth and rot. This is in contrast to felt underlayment, which can absorb moisture over time, potentially leading to mold growth and degradation. Synthetic underlayment provides a sturdy barrier that effectively withstands heavy rain, keeping the underlying structure dry and well-protected.
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Repair or complete replacement
The first step in deciding whether to repair or replace the plastic underlayment of your roof is to assess the extent of the damage. If the plastic underlayment has only minor damage, such as small holes or tears, it may be possible to repair it by patching the affected areas. However, if the underlayment has suffered extensive damage, degradation, or has simply reached the end of its lifespan, complete replacement may be necessary.
The lifespan of underlayment typically ranges from 12 to 20 years. If your roof is approaching or has exceeded this age, it may be wise to consider a complete replacement, especially if you are experiencing frequent leaks or other issues.
When it comes to repairing plastic underlayment, small patches can be inserted in a V-shape and stapled to the roof trusses, providing a temporary solution. However, if the underlayment has failed completely, a full replacement is usually the only correct option. This process typically involves removing the existing roof tiles, installing new underlayment, and then replacing the tiles.
It is important to note that repairing or replacing plastic underlayment can be a challenging task. It may require scaffolding and must comply with building regulations. It is always recommended to consult with a professional roofer or tradesperson to assess the specific needs of your roof and ensure a safe and proper repair or replacement.
In terms of replacement options, there are two main types of underlayment: asphalt felt and synthetic. Asphalt felt underlayment is manufactured by soaking a base material in asphalt to create a water-resistant barrier. While it is less expensive, it does not offer the same level of protection as synthetic underlayment. Synthetic underlayment, made from durable polymers like polyethylene or polypropylene, provides superior strength, elasticity, and durability. It is also resistant to moisture and fungal growth, making it a longer-lasting and more effective option.
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Regulations and requirements
When replacing the plastic underlayment of roof tiles, there are several regulations and requirements that must be considered to ensure compliance with local laws and standards. Here are some key points to keep in mind:
Planning Permission and Building Regulations:
In most cases, planning permission is not required for simply replacing roof tiles, especially if the work adheres to existing building regulations. However, it is crucial to consult your local authority to understand any unique restrictions they may have regarding the type of tile or underlayment used, and whether specific approvals are necessary.
Building Control and Like-for-Like Replacements:
Building control requirements can vary depending on the extent and nature of the replacement work. In some cases, if the replacement involves more than 25% of the building envelope or 50% of the roof, building control approval may be needed. However, if it is a like-for-like replacement, meaning no changes to the type of tiles or underlayment, building control may not be required, as one UK example illustrates.
Insulation and Ventilation Requirements:
Insulation and ventilation regulations, such as Part L of Building Regulations in Surrey, UK, may mandate minimum standards for energy efficiency. This could include upgrading insulation during roof work and maintaining adequate ventilation space above the insulation to prevent water ingress.
Material Selection and Local Codes:
The choice of underlayment material must often comply with local council codes and building regulations. Climate plays a significant role, with high-performance water-resistant underlayment being necessary in areas with heavy rainfall or snow, and UV-stable underlayment for extreme heat.
Historic Preservation Standards:
If working on a historic building, it is essential to consult with a qualified preservation professional. Procedures for rehabilitating historic buildings must meet federal standards and current environmental regulations, ensuring that any products or methods used are compliant and appropriate.
Safety and Maintenance:
Safety standards and maintenance requirements must be adhered to during roof work. This includes establishing rules for foot traffic on the roof, securing ladders to prevent accidents, and conducting inspections after exposure to severe weather conditions.
It is important to consult with roofing professionals, local authorities, and, if applicable, historic preservation experts to ensure compliance with all relevant regulations and requirements for your specific project.
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Frequently asked questions
Roof tile underlayment is the layer of protection installed between the actual roof and the exterior layer of roofing tiles. It creates a water-resistant barrier that protects the roof in case of water leaks, cracks, or breaks.
There are two main types of underlayment: Asphalt felt and Synthetic. Asphalt felt is manufactured by soaking a base material in asphalt to create a water-shedding barrier. Synthetic underlayment, on the other hand, is made from plastics like polyethylene or polypropylene, offering superior strength, elasticity, and durability.
Typically, underlayment lasts between 12 and 20 years. However, factors such as exposure to harsh weather conditions or foot traffic can accelerate its deterioration. Regular maintenance and inspections are crucial to identify when replacement is necessary.
Some signs that indicate the need for underlayment replacement include persistent roof leaks, cracked or broken tiles, and visible deterioration of the underlayment material. If you suspect any issues, it is advisable to consult a professional roofer for a thorough inspection.
Synthetic underlayment offers enhanced durability, strength, and resistance to moisture and fungal growth compared to asphalt felt. Its lightweight nature makes it easier to install without causing damage. Synthetic underlayment also provides superior waterproofing performance, ensuring your roof remains protected from water infiltration.
