When it comes to roofing, many homeowners focus on the visible elements like shingles, flashing, and gutters. However, there’s a critical component hidden beneath the surface that plays a vital role in protecting your home from the elements – roof underlayment.
In this blog post, we’ll break down:
- What roof underlayment is
- Why it’s important
- Signs that indicate you need to replace it
- The pros and cons of synthetic underlayment vs felt underlayment
- The cost considerations associated with different underlayment styles
What is Roof Underlayment?
Roof underlayment, also known as roofing felt or simply underlayment, is a crucial layer installed between the roof deck (plywood or OSB) and the roofing material (shingles, tiles, metal panels, etc.). Its primary purpose is to provide an additional barrier against moisture infiltration, protect against wind-driven rain, and improve the overall durability and longevity of the roofing system.
Why is Roof Underlayment Important?
- Waterproofing: Roof underlayment acts as a secondary barrier against water infiltration. Even if your shingles or roofing material fail to keep water out, the underlayment can prevent leaks and water damage to the structure of your home.
- Weather Protection: It serves as a safeguard against harsh weather conditions, including heavy rain, snow, and wind. This extra layer can help protect your roof from damage during storms.
- Condensation Control: Underlayment also helps manage moisture within the attic space. It can prevent condensation from forming on the underside of the roof, which can lead to mold growth and wood rot.
- Enhanced Durability: Roof underlayment provides additional support to the roofing material, enhancing its durability and preventing it from tearing or getting damaged during installation or maintenance.
Signs You Need to Replace Your Underlayment
Over time, roof underlayment can deteriorate due to exposure to the elements. Here are some signs that indicate it’s time toreplace your underlayment:
- Visible Damage: Check for tears, holes, or wrinkles in the underlayment. These can compromise its effectiveness.
- Moisture Issues: If you notice water stains or moisture in your attic, it may be a sign that the underlayment has failed.
- Roof Age: If your roof is approaching or has surpassed its expected lifespan, it’s a good idea to inspect and potentially replace the underlayment.
- Roofing Replacement: When you’re replacing your roofing material (shingles, tiles, etc.), it’s a good time to replace the underlayment as well.
Synthetic Underlayment vs. Felt Underlayment
Now that we understand the importance of roof underlayment let’s comparetwo common types: synthetic underlayment and felt underlayment.
Synthetic Underlayment
Synthetic underlayment is a relatively newer technology in the roofing industry. It’s made from materials like polyethylene or polypropylene, which are lightweight, durable, and resistant to moisture. Here are some of the pros and cons of synthetic underlayment:
✅ Pros of Synthetic Underlayment:
- Lightweight: Synthetic underlayment is much lighter than traditional felt, making it easier to handle during installation.
- Durability: It is highly resistant to tearing and can withstand harsh weather conditions, including UV exposure.
- Moisture Resistance: Synthetic underlayment does not absorb moisture, reducing the risk of mold growth and rot.
- Installation Efficiency: It’s available in large rolls, which can cover more area, and it often lays flatter and smoother, reducing the risk of wrinkles.
❌ Cons of Synthetic Underlayment:
- Cost: Synthetic underlayment tends to be more expensive than felt.
- Environmental Impact: Some synthetic materials may not be as environmentally friendly as natural felt.
Felt Underlayment
Felt underlayment, also known as asphalt-saturated felt paper, has been a staple in roofing for many years. It’s made from organic or fiberglass materials impregnated with asphalt. Let’s explore the advantages and disadvantages of felt underlayment:
✅ Pros of Felt Underlayment:
- Affordability: Felt underlayment is generally more budget-friendly compared to synthetic alternatives.
- Tradition: Many roofing professionals are familiar with felt underlayment, and it has a long history of use in the industry.
- Weight: While it’s heavier than synthetic underlayment, the added weight can help hold it in place during installation.
❌ Cons of Felt Underlayment:
- Moisture Absorption: Felt underlayment can absorb moisture over time, potentially leading to mold growth and degradation.
- Durability: It is more prone to tearing and wear during installation and exposure to the elements.
- Environmental Concerns: Some felt underlayments contain organic materials that may not be as environmentally friendly as synthetic options.
The Cost of Different Underlayment Styles
The cost of roof underlayment can vary significantly based on the material, quality, and brand. Here’s a general overview of the cost considerations for synthetic and felt underlayment:
Synthetic Underlayment:
On average, synthetic underlayment can cost between $0.15 to $0.50 per square foot. While it’s more expensive upfront, its durability and moisture resistance can result in long-term savings on potential repairs.
Felt Underlayment:
Felt underlayment is typically more affordable, ranging from $0.08 to $0.25 per square foot. However, it may require more frequent replacement, which can increase long-term costs.
It’s essential to factor in the total cost of your roofing project, including the underlayment, when making your decision. While synthetic underlayment may have a higher initial cost, it can offer better protection and durability in the long run, potentially saving you money on future repairs.
Get Your Roofing Underlayment Installed By A Top-Notch Roofing Contractor
Choosing the right roof underlayment is a crucial decision that can impact the longevity and performance of your roofing system. Synthetic underlayment offers several advantages in terms of durability and moisture resistance, while felt underlayment is a more budget-friendly option. Consider your specific needs, budget, and climate when deciding which underlayment material is the best fit for your roofing project. Regardless of your choice, investing in quality underlayment is a wise decision to protect your home from the elements and ensure a long-lasting roof.
Contact Northface Construction to get your underlayment installed correctly!