BUR/Tar & Gravel
What is BUR?
Popular in North America for more than 100 years, built up roofing (BUR) systems are composed of alternating layers of bitumen (asphalt) and fabrics called roofing felts. The felts are reinforced with either glass-fiber mats or organic mats (ply sheets) and when joined with the bitumen form a durable roofing membrane. The number of “plies” on a roof implies the number of layers, i.e. “four plies” denotes a four-layer flat roof membrane system.
What are the advantages of BUR?
1. UV resistance A built-up roof is highly resistant to UV radiation. The natural rocks act as a perfect barrier to protect the under layers from the destructive UV rays.
2. Ease of repair A built-up roof is very easy to repair, you can easily make that patch any size you want without affecting aesthetics
3. Very low maintenance If done properly built-up roofs have a very long life span with little to no maintenance
4. Impact resistance With a thick layer of gravel on top a built-up roof is very resistant to hail
5. Puncture resistance A built-up roof is highly resistant to damage from foot traffic, accidental damage, debris, etc.