Tar and Gravel Roof Cost: 2026 Installed Price Calculator
Mike Martin, MA CSL, is the founder and construction cost editor of RemodelingExpense. His residential construction experience informs the site’s cost research, calculators, and homeowner project guidance.
Tar and gravel roof cost ranges from $5.00 to $10.00 per sq. ft. installed, with most 1,500 sq. ft. tar and gravel roof replacements costing about $7,500 to $15,000.
This estimate is for a gravel-surfaced built-up roof system used on low-slope roofs, flat roof sections, garages, additions, porches, and small commercial-style roof areas. It is not for EPDM, TPO, PVC, modified bitumen, basic roll roofing, asphalt shingles, metal roofing, or tile roofing.
Enter your ZIP code and roof square footage below to estimate local material, labor, and installed cost.
Cost Calculator
Tar and Gravel Roof Cost Calculator
Tar and gravel roof cost depends on roof square footage, built-up roofing layers, hot asphalt or bitumen, gravel surfacing, flood coat, roof drains, scuppers, parapet walls, edge metal, flashing, insulation, cover board, roof weight, odor, access, tear-off, recover versus replacement, permits, and local labor rates.
Your estimated cost
For 1,500 sq. ft.
$7,500 – $15,000
About $5 – $10 per sq. ft.
Use your estimate as a starting point, then compare real prices from local contractors.
| Cost item | Low estimate | High estimate |
|---|---|---|
| Material | $3,000 | $6,000 |
| Labor | $4,500 | $9,000 |
| Estimated installed cost | $7,500 | $15,000 |
| Installed cost per sq. ft. | $5 | $10 |
Why your price may change
- Local labor rates vary.
- Material quality affects the price.
- Old material removal, repairs, permits, or code updates can add cost.
- Hard-to-reach areas, complex layouts, rush jobs, or premium contractors may cost more.
Estimate includes local labor adjustments and may differ slightly from rounded national cost examples.
Tar and Gravel Roof Cost vs Value
Tar and Gravel Roof may recover about 35%–55% of its cost.
Bottom line: A tar and gravel roof is a gravel-surfaced built-up roof system for low-slope roofs, offering a traditional multi-ply asphalt roof assembly with a protective gravel surface.
Worth it: Low-slope roofs where the owner wants a traditional tar and gravel roof, built-up roofing layers, flood coat, gravel surfacing, and a familiar flat roof system.
Skip it: Roofs where odor, access, hot asphalt work, added roof weight, or gravel maintenance is a concern, or where EPDM, TPO, PVC, modified bitumen, roll roofing, shingles, or metal better match the project.
ROI ranges are planning estimates and should not be treated as an appraisal. This is only an estimate. Real resale value depends on your home, neighborhood, market, project quality, and buyer demand.
How to Measure Tar and Gravel Roof Area
Use roof square footage, not interior floor space. A low-slope roof, flat roof section, garage, addition, or porch may need more material than the building footprint once parapet walls, edge details, drains, penetrations, flashing, gravel surfacing, and waste are included.
Tar and gravel roof estimates should also account for built-up roof layers, flood coat, gravel surfacing, insulation, cover board, roof drains, scuppers, edge metal, roof-wall transitions, access, and whether the old roof must be removed.
Tar and Gravel Roof Cost Factors
Contractor Reality Check
A tar and gravel roof is a specific built-up roof assembly, not just a generic flat roof. A complete quote should explain the number of layers, hot asphalt or bitumen work, flood coat, gravel surface, insulation, flashing, drains, edge metal, tear-off, disposal, roof access, and warranty coverage.
What to Confirm Before You Sign
- Built-up roof layers and reinforcing plies
- Hot asphalt, bitumen, or approved adhesive method
- Flood coat and gravel surfacing details
- Insulation, cover board, and roof deck condition
- Roof drains, scuppers, edge metal, and flashing details
- Parapet walls, skylights, pipes, HVAC curbs, and penetrations
- Recover versus full tear-off and disposal
- Odor, access, cleanup, material warranty, and labor warranty
Common Tar and Gravel Roof Add-On Costs
| Item | Typical Added Cost |
|---|---|
| Old roof tear-off and disposal | $1.50 – $4.00 per sq. ft. |
| Roof decking replacement | $70 – $150 per sheet |
| Rigid insulation or cover board | $1.50 – $5.00 per sq. ft. |
| Drain, scupper, or edge metal work | $500 – $3,500+ |
| Flashing around curbs or penetrations | $300 – $2,500+ |
Tar and Gravel Roof Cost by Type
| Tar and Gravel Roof Type | Installed Cost per Sq. Ft. | Best For |
|---|---|---|
| Basic tar and gravel roof | $5.00 – $7.00 | Simple low-slope roofs with limited penetrations and easy access |
| Tar and gravel roof with tear-off | $6.00 – $9.00 | Replacing older flat roofing before installing a new gravel-surfaced BUR system |
| High-detail tar and gravel roof | $8.00 – $10.00+ | Roofs with parapets, drains, curbs, skylights, insulation, or more flashing work |
Cost by Roof Size
| Roof Area | Estimated Installed Cost |
|---|---|
| 750 sq. ft. | $3,750 – $7,500 |
| 1,000 sq. ft. | $5,000 – $10,000 |
| 1,500 sq. ft. | $7,500 – $15,000 |
| 2,000 sq. ft. | $10,000 – $20,000 |
Is a Tar and Gravel Roof Worth It?
A tar and gravel roof is usually worth it for low-slope roofs where a traditional gravel-surfaced built-up roof system makes sense. It can be a good fit for garages, additions, porches, flat roof sections, and small commercial-style roofs. It may not be worth it if odor, access, hot asphalt work, added roof weight, or gravel maintenance is a concern, or if EPDM, TPO, PVC, modified bitumen, roll roofing, shingles, or metal better matches the project.
Related Roofing Cost Guides
References
- GAF: Built-Up Roofing Systems
- CertainTeed Commercial Roofing
- GAF: How to Measure a Roof
- InterNACHI: Flat Roof Inspection
Last Updated: 6/19/26
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