Built Up Roofing: Tar And Gravel Roofing Systems

Tar and gravel — also called built-up roofing (BUR) — is a traditional flat-roof system made of multiple alternating layers of asphalt (bitumen) and reinforcing felt, topped with a layer of gravel. The gravel protects the membrane from UV and physical damage, and the layered build creates a tough, redundant waterproof surface. Iron Shield Roofing installs and services tar and gravel roofs across Edmonton.

Yes — built-up roofing has a long track record on Edmonton flat roofs. Its multiple layers provide redundancy against leaks, the gravel surface shields it from UV and hail, and the heavy, durable build stands up to foot traffic and weather. With good drainage and maintenance, it's a proven long-lasting option. Iron Shield Roofing installs BUR systems suited to Alberta conditions.

A well-built and maintained tar and gravel roof commonly lasts around 20 to 30 years, and sometimes longer, thanks to its multi-layer construction. Keeping drains clear and addressing small issues early helps it reach the upper end of that range. Iron Shield Roofing builds and maintains BUR roofs to get the most from their lifespan.

Built-up roofing offers excellent durability, multi-layer redundancy against leaks, strong protection from UV and physical damage thanks to the gravel, good performance under foot traffic, and a long, proven history. Its layered design means a single point of damage is less likely to cause a leak. For many Edmonton flat roofs, it remains a dependable choice.

A tar and gravel roof is built up in place: alternating layers of hot or cold asphalt and reinforcing felt or ply sheets are applied over the deck and insulation, then finished with a flood coat of asphalt and a layer of gravel. The process creates a thick, seamless, redundant membrane. Iron Shield Roofing installs BUR to manufacturer and industry standards.

Tar and gravel is a heavier, multi-layer built-up system valued for redundancy and durability, while TPO and EPDM are lighter single-ply membranes that install faster and can be more reflective or flexible. BUR's gravel surface offers good impact and UV protection, while single-ply systems offer simpler repairs and lighter weight. Iron Shield Roofing installs all of these and will help you compare for your building.

Yes — tar and gravel roofs are repairable. Common issues like blisters, cracks, alligatoring, and flashing problems can usually be addressed without replacing the whole roof, though locating a leak under the gravel takes experience. Iron Shield Roofing inspects the roof to find the source and carry out the right repair.

The cost of a tar and gravel roof depends on the size of the roof, the number of plies, the amount of tear-off, and the complexity of drains and details. Built-up roofing involves more material and labour than some single-ply systems. Because every roof is different, the most accurate way to know is a free assessment and written quote from Iron Shield Roofing.

Yes — like any flat roof, BUR benefits from regular maintenance: keeping drains and scuppers clear, checking flashing, and watching for blisters or cracks. Ponding water is the leading cause of premature flat-roof failure in Edmonton, so drainage is a key focus. Iron Shield Roofing can set up a maintenance schedule to protect your tar and gravel roof.

Tar and gravel remains a solid, durable choice, and if your existing BUR roof is sound it can often be maintained or repaired rather than replaced. When replacement is needed, some owners stay with BUR while others move to a single-ply system — it depends on the building and budget. Iron Shield Roofing will give you an honest assessment of the best path for your roof.