Tar and Gravel Roof FAQ: 10 Questions New Mexico Homeowners Ask

A tar and gravel roof, also called a built-up roof or BUR, is a low-slope roofing system made from multiple layers of roofing material and asphalt, with gravel protecting the surface. The gravel helps shield the asphalt underneath from sunlight, weather, and physical damage.

These roofs are common on older homes and buildings throughout New Mexico, and they can perform well when they are maintained properly. But they can also be confusing for homeowners because much of the waterproofing system is hidden underneath the gravel.

At Roof Repair Today, we inspect and repair tar and gravel roofs, including leaks, parapet walls, roof penetrations, blisters, exposed or deteriorated asphalt, drainage problems, and other weak areas. Here are 10 of the questions homeowners ask most often.

1. How long does a tar and gravel roof last?

A tar and gravel roof can often provide around 20 years or more of service, but there is no single lifespan that applies to every roof. Some roofing sources place well-maintained built-up roofs in roughly the 20-to-30-year range.

What matters more than the birthday of the roof is its actual condition.

We look at factors such as:

• Condition of the asphalt and roofing layers

• Amount of gravel coverage

• Drainage and ponding water

• Parapet walls and flashings

• Roof penetrations

• Previous repairs

• Evidence of trapped moisture

• Blisters, cracks, splits, or soft areas

• Maintenance history

A 20-year-old roof that has stayed dry and been maintained may be in better shape than a much newer roof with drainage or installation problems.

That is why we do not recommend replacing a tar and gravel roof based on age alone.

2. Why is my tar and gravel roof leaking?

Leaks on tar and gravel roofs often develop around flashings, parapet walls, drains, roof edges, penetrations, previous repairs, cracks, or other transitions rather than through an obvious hole in the middle of the roof.

One of the difficult things about this roof system is that the leak you see inside the house may not be directly below the place where water entered.

Water can travel between roofing layers or along the roof deck before it finally reaches the interior. The gravel also makes visual leak detection more difficult because it covers much of the waterproofing surface. Roofing professionals and homeowners discussing BUR leaks repeatedly identify this as one of the challenges of the system.

That means covering the area directly above a ceiling stain with more roofing cement does not necessarily fix the source.

A good leak inspection should look at the surrounding roof system, including parapets, flashings, penetrations and drainage—not just the interior drip location.

3. Are blisters or bubbles in a tar and gravel roof a serious problem?

They can be. A blister is a raised or swollen area in the roofing system. Blisters can develop when air or moisture becomes trapped between roofing layers and expands as the roof heats up.

A small isolated blister does not automatically mean the entire roof needs replacement. We look at its size, location, firmness and whether the surrounding roofing is still sound.

We become more concerned when there are:

• Numerous blisters across the roof

• Large or growing bubbles

• Cracked blisters

• Moisture around the affected area

• Soft roofing underneath

• Repeated blister repairs in the same area

Simply coating over a moisture-filled blister may hide the problem rather than correct it. The cause and condition underneath need to be considered first.

4. What does it mean when the black tar is exposed?

The gravel on a tar and gravel roof is there for a reason.

It helps protect the asphalt underneath from ultraviolet sunlight, heat and physical wear. When gravel moves or disappears, the exposed asphalt receives more direct exposure to the weather.

Small bare areas do not always mean the roof has failed, but they deserve attention.

We inspect exposed areas for:

• Dry or brittle asphalt

• Cracking

• Alligator-like surface patterns

• Splits

• Blisters

• Exposed reinforcing material

• Soft spots

• Previous patch deterioration

If the material underneath is still in usable condition, a localized repair may be possible. If large areas are exposed and deteriorating, the roof may need more extensive restoration or replacement.

5. Is missing or loose gravel a problem?

Some movement of loose gravel is normal, but large bare areas or gravel collecting heavily in drains and low spots should be investigated.

Gravel can move because of wind, water flow, foot traffic, previous work on the roof or deterioration of the asphalt holding it in place.

The bigger concern is what is underneath the missing gravel.

If the asphalt is still protected and in good condition, the problem may be relatively limited. If it has become cracked, brittle or badly weathered, additional repair may be needed.

Loose gravel can also collect around drains and scuppers, which can interfere with drainage.

This is another reason routine inspections matter: something that looks like a simple gravel problem may actually point to deterioration underneath.

6. Can a tar and gravel roof be repaired, or does it need to be replaced?

Many tar and gravel roofs can be repaired when the problem is localized and the surrounding roofing system is still sound.

Common repair areas can include:

• Leaks

• Weak or deteriorated sections

• Blisters and bubbles

• Cracks or splits

• Exposed asphalt

• Flashings

• Roof penetrations

• Drains and scuppers

• Parapet walls

• Previous failed repairs

The repair-versus-replacement decision changes when problems become widespread.

Multiple recurring leaks, extensive deterioration, wet roofing materials, widespread soft areas, poor drainage or a damaged roof deck can make continued patching less practical. Industry guidance similarly emphasizes the difference between isolated defects and system-wide failure when deciding whether to repair or replace built-up roofing.

At Roof Repair Today, our goal is to identify what is actually wrong before recommending a direction. An older roof does not automatically need replacement, and a newer roof is not automatically repairable.

7. Can you put a roof coating over a tar and gravel roof?

Sometimes—but not every tar and gravel roof is a good coating candidate.

A coating can make sense when the existing roofing system is sufficiently sound and dry and can be properly prepared for the coating product being used.

Before recommending a coating, we want to understand what is underneath it.

Problems such as trapped moisture, wet insulation, widespread blisters, loose roofing materials, failing flashings or serious structural issues should not simply be covered over. Industry guidance warns that coatings are not substitutes for correcting underlying moisture or failed roofing components.

Proper preparation can include removing or managing loose gravel, repairing defects, addressing flashings and penetrations, correcting appropriate drainage issues and preparing a suitable surface for adhesion.

The right coating also depends on the existing roof and the manufacturer's requirements.

A roof coating can be a restoration option. It should not be treated as a magic layer that makes every old flat roof new again.

8. How often should a tar and gravel roof be inspected and maintained?

We recommend keeping an eye on a flat roof regularly and having it professionally inspected periodically, especially after significant weather or when you notice a change inside the home.

Drainage deserves particular attention.

Leaves, dirt and roofing debris can collect around drains and scuppers. Ponding water and blocked drainage are common concerns on low-slope roofs, and industry maintenance guidance emphasizes keeping drainage paths clear.

A tar and gravel roof inspection should typically look at:

• Gravel coverage

• Exposed asphalt

• Blisters and cracks

• Soft or weak areas

• Parapet walls

• Flashings

• Penetrations

• Drains and scuppers

• Ponding areas

• Previous repairs

• Interior evidence of moisture

There is one important limitation homeowners should understand: the gravel can hide portions of the roofing surface.

During a basic visual inspection, we cannot automatically see every inch of the membrane or every condition beneath the gravel. Gravel may need to be moved in selected areas, and additional investigation may sometimes be necessary before the condition underneath can be confirmed.

9. How much does tar and gravel roof repair cost?

There is no responsible single price for tar and gravel roof repair without looking at the roof.

The cost can change significantly depending on:

• Size of the damaged area

• How much gravel must be moved

• Number and condition of the roofing layers

• Leak location

• Parapet or flashing work

• Roof penetrations

• Drainage problems

• Whether insulation or decking is wet

• Access to the roof

• Previous repairs

• Whether the problem is localized or widespread

Tar and gravel leak repairs can also require more diagnostic work because the visible interior leak may not identify the actual exterior entry point.

National and local online pricing guides show very wide ranges for flat-roof work, reinforcing why an inspection is more useful than a generic price-per-repair figure.

Roof Repair Today does not want to guess at a repair price without understanding what actually needs to be fixed. A proper inspection lets us define the repair area and recommend the appropriate scope.

10. What are the warning signs that a tar and gravel roof may be failing?

Do not judge a tar and gravel roof only by whether it is currently dripping.

Warning signs can appear both outside and inside the home.

Watch for:

• Repeated roof leaks

• Water stains on ceilings or walls

• Blisters or bubbles

• Large areas of missing gravel

• Exposed or badly cracked asphalt

• Alligator-style cracking

• Soft spots

• Sagging areas

• Persistent ponding water

• Deteriorated parapet walls

• Open or damaged flashing

• Problems around pipes, vents, skylights or HVAC equipment

• Repairs that repeatedly fail

• Moisture or damaged materials below the roof

These conditions do not automatically mean the entire roof has failed. They are signs that the roof deserves a closer inspection.

One of the most important things we look for is whether problems are isolated or widespread. A localized weak spot may be repairable. Multiple failures across different areas can point to a larger problem with the roofing system.

Need a Tar and Gravel Roof Inspection in New Mexico?

If you have a tar and gravel roof in Albuquerque, Santa Fe, or a nearby New Mexico community, Roof Repair Today can help determine what condition it is actually in.

We inspect tar and gravel roofs for leaks, blisters, exposed or deteriorated asphalt, parapet problems, roof penetrations, drainage concerns, weak areas and previous repairs. We can then help you understand whether targeted repair, preventive maintenance, restoration or replacement should be considered.