19 April 2021

Steel Roof Components and Accessories

To better understand steel roofing and how they work, let's start with some steel roofing components, common accessories and other important roofing terms and definitions.

Steel Roof Components

Steel roof components consist of several types of designs and certain coating materials, in general, a steel roof has the following components:

1. Coal / Steel Sheet

Long steel coils, continuous steel coils that have been treated or coated with paint. All steel roofs begin as steel coils or sheet metal, which are then rolled, cut, and rolled into panels for installation.

2. Panel

Panels are pieces of rolled steel that have been formed into the desired profile / ribbing structure and are ready to be joined together to form a roof.

3. Seam

The side ribs where two steel panels are joined and connected. The sheets are formed using a rollformer and then either hammered together or mechanically joined.

4. Profile

Steel panels are formed into. The profile is what determines how the panels fit and connect together. 5. Rollforming Equipment

5. Rollforming Equipment

Machines, whether stationary or portable equipment, that mold and shape the coils into individual panels.

Steel Roof Mounting Accessories

Supporting materials in the case of a steel roof mounting system, the material is very complex so that the steel roof has the ability to be usable because it is supported by the following supporting materials:

1. Underlayment

Underlayment is a layer of material that sits under the steel panels and provides protection from water and humidity, high temperatures, and steam. Underlayments are generally mounted mechanically or self-adhering with glue support on the roof deck. Although there are many types of undercoat, the commonly felt material is synthetic (polypropylene or polyethylene), fully adhering leather and sticks.

2. Clips

Clips are used to attach steel roof panels to the roof deck. Clips are placed on the sheet section of the lower panels, which are then attached to the roof deck by fasteners. After the clips are placed on the bottom panel, the top panel is placed on top of the clips and the two panels are either attached together or mechanically inserted into place, securely attaching them to the structure.

3. Fasteners

Fasteners are screws used to attach the steel roof to the roof deck during installation.

4. Rivet

Rivets are similar to fasteners, but require a special rivet gun to install.

5. Sealent

Sealants are used during installation to seal water, dirt, wind, and other substances that can enter small crevices, making the roof as tight as possible. The sealant, which is usually made of silicone or polyurethane, comes out of the tube as a flexible sealing compound which dries after application. Most of the sealants are available in colors that match the roof panels.

6. Butyl Tape

Butyl tape is used in the same way as sealants by sealing gaps and joints in steel roofs. It is also commonly used for pruning purposes. It differs from sealants in that it is in the form of one or two sided tape and a compression seal.

7. Clamps

Clamps are small metal parts that are fastened and attached to the top of the steel roof in the lining. These clamps have screws at the top which are used to attach additional roofing items such as snow retention systems, solar panels, satellite dishes, signs, air conditioning units, etc.

8. Pipe Boot

The pipe boot is a cone-like fitting that is installed around the exhaust pipe that exits through the roof. These products are usually made of EPDM rubber (silicon is also available for high temperature applications). The pipe boot, which can be purchased in a color that matches the roof, is cut to fit the diameter of the exhaust pipe and then sealed onto the pipe and steel surface.

9. Fascia

Trim just under the roof that runs the perimeter of the structure to help keep water flowing into the structure.

10. Drip Edge

A long piece of metal attached so that water flows into the gutter and away from the fascia.

11. Eave

A portion of the roof that extends past the supporting walls.

12. Valley

The internal angle at which the two sloping roof planes meet.

13. Hip

The external corner or overhang where the two sloping roof panels meet.

14. Ridge

The highest part of the roof where at least two roof panels have come to a point (usually a horizontal line).

15. Gable

The triangular part of the wall between the sloping edges of the roof. Trim that occupies this article is usually called "gable or rake trim".

16. Cricket

Mounted saddle construction that is installed between the chimney and the roof surface to prevent the build-up of dirt and water.

17. Flashing

Sheet metal used to seal various parts of the roof, e.g. Chimneys, valleys, etc., and provide extra weather firmness.

18. Curb

Accessories used to attach extras (air conditioning unit, fan, signs) and provide a level support structure on a sloping roof.

19. Roof Decking

Attached base or foundation and roofing material. Common roof deck materials are metal, plywood, and oriented strand board (OSB).

20. Pitch

The slope of the roof, measured using the rise of the roof divided by its run.