What is UL 790 Class A?
What is UL 790 Class A?
UL 790 evaluates the ability of the roof assembly to resist a simulated fire source originating from outside the building on which the roof coverings are installed.
What is a Class A fire rated roof?
Class A is the highest rating, offering the highest resistance to fire, and unrated is the worst. Examples of a Class A roof covering include concrete or clay roof tiles, fiberglass asphalt composition shingles and metal roofs. An example of an unrated covering is an untreated wood shake roof.
What is roof type A?
Aluminum Shingles A popular metal roofing choice for homeowners after standing seam roofs, this is an interlocking roofing system that is fire, wind and impact resistant. Lightweight compared to other types of roofing materials.
What is a UL rating on a roof?
UL developed a test to rate the strength of roofing materials called the UL 2218 Impact Rating, which is the test that determines if a roofing material is Class 1,2,3, or 4.
Are all asphalt shingles Class A?
Due to the materials used in their construction, most asphalt shingle roof assemblies have a Class A fire resistance rating. Fire resistance is based on two test standards: UL 790 and ASTM E 108. There are three levels of fire resistance; Class A is the highest level.
Are solar roof tiles fire resistant?
Solar roof tiles are also made to be fire resistant, the same of which can’t be said for solar panels. Solar panels do have the benefit of being able to be removed after installation.
Is Class 1 and Class A fire rating the same?
What is a Class A or Class 1 fire rating? A class 1 fire rating is the best fire rating of materials that can be achieved. Class A fire ratings indicate a flame spread rating somewhere between zero and 25.
What is a Class A roof type?
Common Class A roof coverings include asphalt fiberglass composition shingles, concrete and flat/barrel-shaped tiles. Some materials have a “by assembly” Class A fire rating which means, additional materials must be used between the roof covering and sheathing to attain that rating.
What is the difference between Class A and Class C roofing?
This standard includes three classes of fire exposure: • Class A roof coverings, which are effective against severe fire test exposures • Class B roof coverings, which are effective against moderate fire test exposures • Class C roof coverings, which are effective against light fire test exposures.
What is a Class A assembly?
Class A roof assemblies are those that are effective against severe fire test exposure. Class A roof assemblies and roof coverings shall be listed and identified as Class A by an approved testing agency. Class A roof assemblies shall be permitted for use in buildings or structures of all types of construction.
What are the four fire classifications for roof coverings?
Your roof can have one of four fire ratings classifications: Class A, Class B, Class C, or unrated. A Class A roof is ideal for fire protection and may be required by your building codes depending on your place of residence.
What class is a 30 year shingle?
30 year impact resistant shingles vary in strength from class 1 to class 4. The type of class determines the material and the resistance of the shingle. Generally class 4 is the highest level of protection making the shingle less susceptible to hail damage or damage from other storms or weather debris.
Which shingles are not fire rated?
Class A is the most fire-resistant and should be the choice of anyone living in wildfire-prone areas. Common Class A roof coverings include asphalt fiberglass composition shingles and concrete or clay tiles.
What is Class A roof material?
Is Class A fire rating 1 hour?
With a flame spread of 25 or less, cellulose has a Class 1 Fire rating. Walls with cellulose insulation are one-hour (or greater) fire walls and can help control the spread of fire.
How long is a Class A fire rating?
Class A – Flame-spread 0-25, smoke developed 0-450. Class B – Flame-spread 26-75, smoke developed 0-450. Class C – Flame-spread 76-200, smoke developed 0-450….Exterior Wall Construction.
| Description of Finish | Time (minutes) |
|---|---|
| 5/8-inch Type X gypsum wallboard | 40 |
| Double 3/8-inch gypsum wallboard | 25 |
What are the 3 main types of roofs?
Three Common Roof Designs and Their Advantages
- Hip. A hip roof has slopes on all of its sides. The roof doesn’t have even a single vertical side.
- Gable. A gable roof features two sloping sides that meet at the top to form a ridge.
- Flat. A flat roof has an extremely low pitch and is almost horizontally level.
What is an A frame roof called?
A-frame. Half-hipped (clipped gable, jerkinhead): A combination of a gable and a hip roof (pitched roof without changes to the walls) with the hipped part at the top and the gable section lower down.
