A built-up roof is also known as BUR, and it is the most general roofing material utilized on low slope roofs. Thats made from different layers of reinforcing bitumen and fabric and completed with a top layer of aggregate, like gravel and stone. A built-up roof is known for flat or low slope roofs due to creating a continuous sealed surface. The built-up roof concept is for over 100 years, although the installation and method are different from that time.

Types of a built-up roof

Modern built-up roof goods incorporate a definite insulation layer for better energy efficiency. The roofing is of three parts:

• Bitumen material
• Ply sheets
• One or more surfacing items

The bitumen, if hot, means it is hot, so it melts during installation, and if cold, it is like an adhesive, which is not liquefied. The cold built-up roof can apply or spray with a squeegee. No toxic fumes are out during application and do not rely on the weather. Better than the hot built-up roof.

The ply sheets of the built-up roof are fabrics that reinforces with organic or fiberglass materials. Each ply sheet is on top over cold or hot bitumen to bind it to the ceiling. Usually, the width is about 36 inches.

Surfacing materials create the top layer and include more beautiful gravels or small stones, relying on the functions. It gives a finishing look and protects from sunlight and damage from falling or flying debris. It makes the built-up roof safe to walk on.

The built-up roof has a lifespan of 15 to 30 years, but some constructions last up to 40 years. It tends better in warmer climates than in the cold.

Pros of the built-up roof

The built-up roof serves to give excellent ultraviolet and waterproofing protection. All thanks to the top layer aggregate. They are fire-resistant. The built-up roof has low maintenance and costs less to maintain.

Repairs of built-up roofs

Issues in built-up roof remedied with simple maintenance:

Open joints – repairing seams or joints that's separated, add cement under the enclosed seam and ensure to hold it down, so it adheres to the substrate. It this does not work out, try cutting significant pieces of felt, and place them over the open joint. Protect them with nails, and then coat the nails with roofing cement. Lastly, spread a little gravel on the glue and let it dry.