Roofing Terms

Roofing Terms Can Help You Understand More About Your Roof

Your Common Roofing Terms Start Here


One of the most important roofing terms to know is ACV. ACV is the replacement cost minus the depreciation over time. Hypothetically, if a homeowner tried to sell their roof today, it would be the dollar amount they could expect to receive in the market place.


RCV stands for Replacement Cost Value. Essentially, this term can be boiled down to the sum of the entire cost of a project, minus the deductible, to replace your roof.


Supplements are any items required to complete a roofing or construction job correctly that the insurance might have accidentally missed or will pay for once incurred. This means the insurance company will reimburse VISION CONSTRUCTION once we provide proof that we completed your roof using that item.

A permit is a great example: permit requirements and costs vary widely with each city, so most insurance companies expect this to be a supplement item. We pay for project permits directly, which could be anywhere from $20 to $150.  We will submit the permit receipt to the insurance company, who then releases an additional check to cover the cost of the permit.

VISION CONSTRUCTION works with your insurance company to work out what’s fair for each project. For example, it might cost us $300 to remove and replace the flashing around your chimney, an item that the insurance might agree to pay only $275 for.

Since there might be some back and forth with pricing requests, discussing supplements may take a few weeks to several weeks, depending on the project.


The amount that homeowners need to pay before your insurance agrees to pay the rest of the claim. This is agreed upon in contract when you first choose your insurance policy.


Most types of property depreciate over time: cars, roofs, furniture, equipment, etc. Depreciation is defined as a reduction in the value of an item with the passage of time, due in particular to wear and tear.


Eaves function to keep rainwater away from the walls of your home. They are also known as the edges of the roof that overhang the face of a wall.

Ice Dam

In the winter, melting snow on the upper roof and in the valleys runs down toward the eaves as water. When it reaches the cold eaves and gutters, it refreezes. The continual thaw and re-freeze process create ice dams. The result is water backing up under the roof shingles or behind fascia boards where it can soak through the roof decking or wall sheathing, causing damage to attics, ceilings, and walls.


The surface that is fastened directly to your rafters – that your roofing material fastens to.


In some situations, can be felt paper or synthetic materials. Felt is a resin paper dipped in oil. There are common issues with felt drying out or ripping. We don’t use this, mainly due to the ineffectiveness and lack of durability. Synthetic materials are used to provide a barrier against water damage and leakage and offer breath-ability.

Ice and Water Shield

Ice and Water Shield is a layer underneath your roof to protect your home from ice and water damage. It’s quickly become the gold standard for creating leak-free roofs in all climates.


Flashing is just material—usually aluminum or galvanized steel—that’s used over joints in roof and wall construction to prevent water seeping in and causing damage. Depending on the style of your house’s roof, you probably have it in the valleys, around the chimney and pipes, and around any dormer windows or skylights. Most damage shows up either in flashing that’s deteriorating due to weathering and oxidizing, or in flashing that has come loose.

Ventilation is Another Important Roofing Term


This system both pulls in external air and exhausts internal attic air. This provides continuous airflow to eliminate damaging conditions like humidity and excessive heat. In the summer, ventilation minimizes heat buildup so air conditioners have to run less and heat doesn’t damage the roof structure or the shingles. In the winter, ventilation balances temperatures to reduce the water damage from ice dams.

You need a roofing company that knows roofing terms in Olathe, KS, and the surrounding areas. Call VISION CONSTRUCTION at 888-360-8474 to speak with our staff about making an appointment today!