Water Proofing Membranes

Tar felt, also known as roofing felt or bituminous felt, is a type of building material commonly used as an underlayment in roofing applications to provide waterproofing and additional protection to the roof structure. Here's an overview of tar felt:

1. Composition: Tar felt is typically made from organic materials such as cellulose fibers or fiberglass saturated with bitumen, a sticky and viscous petroleum-based substance. Bitumen acts as a waterproofing agent, providing a protective barrier against water infiltration.

2. Thickness and Weight: Tar felt is available in various thicknesses, typically ranging from 1 mm to 5 mm or more, with heavier weights offering greater durability and weather resistance. Common weights include 15 lb (pound), 30 lb, and 40 lb felt, referring to the weight per 100 square feet of material.

3. Waterproofing: The primary function of tar felt is to provide waterproofing for the roof structure, preventing water from penetrating through to the underlying materials such as plywood or roof deck. The bitumen in the felt forms a tight seal around roofing nails and penetrations, helping to keep the roof watertight.

4. Protection: In addition to waterproofing, tar felt also provides an additional layer of protection against damage from wind, hail, and other environmental elements. It acts as a cushioning and reinforcing layer between the roofing material (such as shingles or metal panels) and the roof deck.

5. Installation: Tar felt is typically installed in overlapping layers, starting from the eaves and working upward towards the ridge of the roof. Each layer is secured in place with roofing nails or staples, with the upper layers overlapping the lower layers to shed water effectively. Proper installation is crucial to ensure maximum waterproofing and protection.

6. Compatibility: Tar felt is compatible with a wide range of roofing materials, including asphalt shingles, wood shakes, metal roofing, and tile roofing systems. It can be used on both steep-slope and low-slope roofs, making it a versatile choice for various roof designs and configurations.

7. Durability: When properly installed and maintained, tar felt can provide reliable waterproofing and protection for many years. However, its durability may be affected by factors such as exposure to UV radiation, temperature fluctuations, and mechanical damage.

8. Cost-Effectiveness: Tar felt is generally an affordable roofing underlayment option compared to synthetic alternatives such as synthetic underlayment or self-adhering membranes. It offers a cost-effective solution for homeowners and contractors looking to enhance the performance and longevity of their roofing systems.

9. Regulations and Standards: Tar felt must comply with industry standards and regulations governing roofing materials, such as ASTM (American Society for Testing and Materials) standards and local building codes. Compliance ensures that the product meets minimum performance requirements for waterproofing and durability.

10. Maintenance: Regular inspection and maintenance of the roof, including the tar felt underlayment, are essential to ensure its continued effectiveness. Maintenance tasks may include checking for tears or punctures, repairing damaged areas, and keeping the roof surface clean and free of debris.