Roofing felt or felt paper is a protective barrier, and the roofer will place a protective barrier between the shingle and the roof deck of the house. Although people generally accept this form of roof protection, there are several theories that show that this kind of felt is unnecessary and sometimes harmful to the roof.
Use felt Paper on the Roof
In many cases, Builders merchants who replace the roof will use felt paper as a protective barrier before installing the roof panel. The coating can prevent moisture, if left in place, can improve the fire resistance of the roof. If the roof leaks, felt paper can trap the moisture before it enters your house. The manufacturer’s warranty and building regulations may even require felt paper to be installed on the roof under shingles.
However, moisture protection is only possible when the entire roofing felt is complete, and when nailing the shingles into the roof deck below, it is impossible to achieve moisture protection. Therefore, some inspectors and builders merchants expressed doubts about the nature of felt paper. If other measures are taken, professional roof installation opportunities may not use felt paper, but if felt paper is used as part of the project, any work will be safer for the roofer.
Overheated roof
In some region, using felt paper as a roof cushion can cause the roof to overheat. Roofing felt can generate heat between the roof terrace and shingles, shortening the life of the roof and limiting the value of your investment in a new roof. Roofers who help you save money by installing a second layer of roof tiles on existing floors will cause the same problem for your home. In addition to postponing the removal of shingles to a later date, the second layer of shingles also collects heat on the roof and can void the warranty for the new shingles. If there are multiple shingles, repairing the leak can cause further problems.
As long as the roofing felt is not exposed to a damp environment for a few days, it gets wet and retains its integrity. It decomposes in sunlight and a lot of continuous moisture. As long as the wetted roofing felt can be covered with shingles, as long as it is dried first, the surface underneath will not get wet and will not wrinkle, blow or tear. If the felt is still damp, it can tear when the shingles are installed. If the surface underneath is wet, mold and mildew can form, causing the sub-surface and roofing felt to collapse. The folds and air bubbles in the felt create hot air pockets that can damage the shingles over time, and the cracks can affect the ability of the felt to protect the roof.
There are three common roofing felts, including asphalt-saturated felt, rubber asphalt and synthetic non-asphalt fibers.
Asphalt Saturated Felt
For the past two decades, asphalt-saturated felt has been the only ideal type of pillow on the market. The term “roof felt” was actually coined from this pillow model. It is made from a blend of cellulose blends (e.g. asphalt, asphalt and polyester). Asphalt-saturated felt is well known for its flexible base layer called Basemat. Basemat is filled with asphalt to improve the water resistance of the lower layer. Asphalt-saturated felt can be used on the entire roof deck, which increases the rigidity of the deck. This improves the durability of the deck against severe weather such as snow storms, heavy snow and extreme heat conditions.
Rubber Asphalt
This is the most expensive roofing felt. It is made of rubber polymer and asphalt and thus improves water resistance. Use a unique adhesive to coat this lower layer on the roof terrace. The flexibility of rubber asphalt makes it an ideal choice for elements with hot and cold weather. Some unique features that make rubber asphalt an excellent roofing felt are sound absorption, fiberglass reinforcement and water resistance. An advantage of this liner is that it can be applied to the patch in the event of a leak.
Non-asphalt Synthesis
This is the preferred type of lining for most roofers and owners. Unpaved synthetic materials are tear-resistant due to the wear-resistant plastics from which they are made. Such plastics include polypropylene and polyethylene. The incorporation of glass fibers into these compositions can improve their strength, water resistance and elasticity. The asphalt-free plastic felt is designed for the entire roof terrace. Manufacturing companies have used non-asphaltic synthetic materials as the basic model for basic materials. They have also been used with other waterproof products.