Introduction

Shed felts, often referred to as roofing felt or underlayment, is a crucial component of any roofing system. It serves as a protective layer beneath the shingles or tiles, providing essential functions such as waterproofing, drainage, and ventilation. While often overlooked, shed felt plays a vital role in ensuring the longevity and integrity of your roof.

Understanding Shed Felt

Shed felt is typically made from organic materials like bitumen or tar, combined with cellulose fibers. These materials are bonded together to form a flexible, waterproof sheet. It’s available in various thicknesses and weights, each suited for different roofing applications and climate conditions.

Key Functions of Shed Felt

Waterproofing: Shed felt acts as a barrier against moisture penetration, preventing water from seeping into the roof structure and causing damage.

Drainage: It helps channel rainwater away from the roof surface, reducing the risk of leaks and water damage.

Ventilation: Shed felt can contribute to proper roof ventilation by allowing air to circulate beneath the shingles, preventing moisture buildup and mold growth.

Protection: It provides a protective layer for the roofing materials, shielding them from UV rays, wind, and other environmental factors.

Types of Shed Felt

Bitumen Felt: The most common type, bitumen felt is made from a combination of bitumen and cellulose fibers. It’s available in various grades, including standard, heavy duty, and extra heavy duty.

Polyester Felt: This type is reinforced with polyester fibers, making it more durable and resistant to tearing.

Glass Fiber Felt: Similar to polyester felt, glass fiber felt offers enhanced strength and durability.

Choosing the Right Shed Felt

Selecting the appropriate shed felt depends on several factors:

Roof Pitch: Steeper roofs require a heavier-duty felt to withstand the increased weight and water pressure.

Climate: Regions with harsh weather conditions may necessitate a more robust felt to resist wind, rain, and snow.

Roofing Material: The type of roofing material (e.g., shingles, tiles) will influence the felt’s thickness and compatibility.

Building Code Requirements: Local building codes may specify minimum felt requirements for roofing projects.

Installation of Shed Felt

Installing shed felt is a relatively straightforward process that can be completed by homeowners or professionals. Here’s a general overview:

Preparation: Clean the roof surface to remove debris and ensure proper adhesion.

Laying: Start from the bottom of the roof and lay the felt strips overlapping each other, following the manufacturer’s instructions.

Securing: Secure the felt with roofing nails or adhesive, ensuring it’s firmly attached to the roof deck.

Ventilation: If required, install ventilation strips or baffles beneath the felt to promote airflow.

Maintenance and Care

While shed felt is a durable material, it requires minimal maintenance to ensure its longevity:

Regular Inspections: Inspect the roof for any signs of damage, such as tears, holes, or water leaks.

Prompt Repairs: Address any damage promptly to prevent further deterioration and potential water damage.

Roof Cleaning: Keep the roof clean to remove debris that can hinder drainage and promote moisture buildup.

Common Shed Felt Problems and Solutions

Leaks: If you notice leaks, inspect the felt for tears or holes. Repair or replace the damaged section as needed.

Sagging: Sagging felt may be due to improper installation or deterioration. It should be replaced to prevent further issues.

Moisture Buildup: Ensure proper ventilation to prevent moisture buildup and mold growth.

Damage from Storm: After a severe storm, inspect the roof for any damage to the felt. Repair or replace damaged sections.

Frequently Asked Questions About Shed Felt

What is shed felt?

Shed felt, also known as roofing felt or underlayment, is a protective layer placed beneath shingles or tiles on a roof. It serves as a barrier against moisture, provides drainage, and enhances ventilation.

What is shed felt made of?

Shed felt is typically made from organic materials like bitumen or tar, combined with cellulose fibers. These materials are bonded together to form a flexible, waterproof sheet.

What are the different types of shed felt?

The main types of shed felt include:

Bitumen Felt: The most common type, made from bitumen and cellulose fibers.

Polyester Felt: Reinforced with polyester fibers for added durability.

Glass Fiber Felt: Reinforced with glass fibers for strength and durability.

How thick should shed felt be?

The thickness of shed felt depends on the roof pitch, climate, and roofing material. Steeper roofs and harsher climates may require thicker felt.

How is shed felt installed?

Shed felt is typically installed by laying it over the roof deck, overlapping the strips and securing them with nails or adhesive. Proper ventilation is essential to prevent moisture buildup.

How long does shed felt last?

The lifespan of shed felt varies depending on factors like quality, installation, and maintenance. With proper care, shed felt can last for many years.

Can I install shed felt myself?

While it’s possible to install shed felt yourself, it’s recommended to consult a professional roofer for proper installation and to ensure it meets local building codes.

What are the signs of damaged shed felt?

Signs of damaged shed felt include leaks, sagging, moisture buildup, and damage from storms.

How often should I inspect my shed felt?

Regular inspections are recommended, especially after severe weather or if you notice any signs of damage.

Can I replace shed felts without replacing the shingles?

Yes, shed felts can be replaced without removing the shingles. However, it’s important to ensure proper adhesion and ventilation.

Is shed felts expensive to replace?

The cost of replacing shed felts depends on factors like the roof size, type of felt, and labor costs. It’s generally less expensive than replacing the entire roofing system.

Conclusion

Shed felts is an essential component of any roofing system, providing vital protection against moisture, enhancing drainage, and contributing to overall roof performance. By understanding the different types of shed felt, choosing the right product for your specific needs, and following proper installation and maintenansce practices, you can ensure the longevity and integrity of your roof.

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