Blanket
Understanding the concept of a “blanket” in the context of roofing repair and replacement is crucial for homeowners. It doesn’t refer to a literal textile, but rather to the underlying protective layer installed directly beneath your shingles, metal panels, or other primary roofing material. This underlayment acts as a secondary line of defense against water infiltration, especially in challenging conditions or if the primary roofing material is compromised. The cost of this critical component can fluctuate based on several factors. The type of material used for the blanket—whether it’s asphalt-saturated felt or a synthetic underlayment—significantly impacts price. Synthetic options, while often more durable and easier to install, generally come at a higher cost. The overall square footage of the roof will naturally increase the total material cost. Furthermore, the complexity of the roof design, including the number of valleys, hips, and dormers, can affect the labor involved in properly installing the blanket, potentially leading to higher expenses. The condition of the existing roof deck also plays a role; if repairs or replacement of the underlying plywood or OSB are necessary, this adds to the overall project cost.
The Blanket Installation Process
The process of installing a roofing blanket is a fundamental step in ensuring the longevity and integrity of your roof system. It begins after the old roofing material and any deteriorated underlayment have been completely removed and the roof deck has been inspected and prepared. If the deck requires any repairs, such as replacing damaged plywood or OSB, this is addressed first. Once the deck is sound, the underlayment, or blanket, is laid down. For traditional asphalt-saturated felt, rolls are typically overlapped and fastened to the deck. Synthetic underlayments are also rolled out and secured, often with specific fastening patterns recommended by the manufacturer. The edges of the underlayment are carefully overlapped to create a continuous waterproof barrier, ensuring that water is directed away from the roof deck and towards the gutters. Special attention is paid to areas prone to water accumulation, such as valleys and around penetrations like chimneys or vents, where additional layers or specialized flashing might be incorporated into the blanket installation for enhanced protection.
When considering a full roof replacement, especially if you are exploring options like metal roofing, the underlayment is a vital component that works in tandem with the chosen metal panels to create a robust shield. Even for smaller roof repair near me projects, ensuring the existing underlayment is in good condition or replacing it as part of the repair is a wise decision to prevent future issues.
Assessing Proper Blanket Installation
Evaluating whether the roofing blanket was installed correctly is key to a durable roof. A well-installed blanket should create a continuous, unbroken layer across the entire roof deck. Visually inspect the surface after the primary roofing material has been installed; you should not see any gaps or exposed areas of the roof deck through the underlayment. Pay close attention to the overlaps; they should be consistent and properly sealed or fastened according to the manufacturer’s specifications to prevent water from seeping underneath. In areas like valleys, the blanket should be installed with sufficient overlap and integration with the flashing to handle water flow effectively. If you notice any rippling or wrinkling in the underlayment material, it could indicate improper installation, potentially compromising its ability to shed water. A reputable roofing contractor near me will ensure this underlayment is meticulously applied as a crucial preparatory step for your new roofing material.
The selection of the right underlayment material and its proper installation by your chosen roofing contractor are critical for the overall performance and lifespan of your roof. It’s a foundational element that underpins the effectiveness of your primary roofing system, whether that’s asphalt shingles, tile, or metal roofing.
Last updated: September 1, 2026