What's actually happening
Tarmac is stone aggregate held together by a bitumen binder. Fretting happens when that binder oxidises, hardens and loses its grip on the stone at the surface, letting individual chippings work loose under traffic and weathering.
It always starts at the very top layer and, left unaddressed, gradually works its way deeper.
Common causes
New tarmac can shed a small amount of loose chippings in its first few weeks — that's the rolling-in process settling and is normal and self-limiting.
Genuine fretting later in life is usually down to UV and weathering breaking down the binder over years, a poor-quality or under-bitumen mix used at installation, or fuel and oil spills locally softening and dissolving the binder around a stain.
Diagnosing how serious it is
Run your hand across the surface. If it feels gritty and sheds a little dust and stone but the surface underneath is still solid and holds its shape, that's early-stage fretting and can usually be arrested rather than replaced.
If you can see individual stones detaching and leaving visible pockmarks, or the surface has gone noticeably lighter grey and rough over a wide area, the binder loss has gone deeper and a localised seal won't hold.
- Fine dust and occasional loose stone: normal early settling, monitor it
- Gritty surface, dust on your hands, shape still solid: early fretting, sealable
- Visible pockmarks where stones have come away: advanced, needs resurfacing
- Fretting concentrated around a stain: localised binder breakdown from a spill
Repair options
Early fretting can often be arrested with a bitumen-rich sealant or rejuvenator applied across the surface, which re-coats the exposed stone and locks it back down.
Where fretting has gone deeper, the only reliable fix is to plane off and resurface the affected area with a fresh wearing course, since a sealant applied over already-loose stone won't bind properly.
Preventing it recurring
Sealing every few years protects the binder from UV degradation and is genuinely worthwhile on older tarmac. Dealing with oil and fuel spills quickly, before they soak in, avoids the localised breakdown that causes patchy fretting.
Frequently asked questions
Is a small amount of loose chipping on new tarmac normal?+
Yes, in the first few weeks. It settles down once the surface has been trafficked and doesn't indicate a fault.
Can fretting be stopped without replacing the tarmac?+
If it's caught early, yes — a sealant or rejuvenator can bind the loose surface stone back down.
Why does fretting appear worse in patches?+
Localised fretting is usually tied to a spill, standing water, or an area that gets more sun exposure or traffic than the rest of the drive.
Does fretting mean the base has failed?+
Not necessarily — fretting is a surface binder issue and can occur on a perfectly sound base. Cracking with level changes is the sign to check the base instead.
How long does resurfacing take compared to a full rebuild?+
Resurfacing only the wearing course is considerably quicker than a full excavation and rebuild, since the base stays untouched.
Ask us whether it needs sealing or resurfacing
Give us a call on 0191 743 3072 or send photos by email and we'll tell you honestly how far the fretting has gone.