Frequently Asked Questions
Why does my West Slope gravel driveway keep getting worse every winter?
Water running down the grade separates fine particles from coarse ones and moves them downhill with each storm. Over time the base loses its fine material, which is what holds the structure together, and what remains is loose rock sitting on a surface that has lost its bearing capacity in the wettest sections. Adding more rock on top of that process delays it by a season or two but does not stop it because the drainage that would stop it was never built into the driveway in the first place.
Do you excavate out the old material or add new rock on top of it?
We excavate out the failed material. Adding new aggregate on top of a compromised base produces the same failure on a slightly longer timeline because the base problem is still there. The old surface and whatever depth of base material beneath it has lost its structure comes out completely, the subgrade is inspected and corrected where needed, and then new base material is placed and compacted in lifts before the surface aggregate goes on. That sequence costs more up front but does not require a repeat rebuild in three seasons.
What are water bars and do I need them on my driveway?
A water bar is a shallow channel cut diagonally across the driveway surface that intercepts sheet flow running down the grade and diverts it to the side before it gains enough volume to erode the base material. On a West Slope hillside driveway of any significant length, water bars are typically needed at intervals determined by the grade and the amount of drainage area feeding the surface. They need periodic re-cutting as vehicle traffic gradually fills them in, but that maintenance is simple compared to managing a driveway base that has been eroded by uncontrolled surface flow for years.
What aggregate size works best on a steep gravel driveway?
Angular, well-graded crushed aggregate compacts to a surface where particle shapes interlock and resist displacement under vehicle traffic. Round washed rock rolls freely on a grade under tires and migrates downhill. The specific gradation — the blend of fines, mid-range, and coarse particles — depends on the slope angle and how much traffic the driveway carries. We recommend aggregate based on the conditions of the specific driveway rather than applying a single standard specification to every hillside job in the area.
How is a gravel driveway rebuild on a West Slope grade priced?
Cost depends on driveway length, grade, existing base depth that needs to come out, cross-drain locations and sizes needed, and the condition of the subgrade once the failed material is removed. On a hillside lot where material removal requires hauling off the property rather than redistributing on-site, haul-off volume affects cost. A driveway that looks like a simple resurface from above sometimes turns out to have three feet of failed, uncompacted material under the surface once excavation begins. Diagnosis before pricing is what keeps the final cost from diverging significantly from the initial estimate.
How long does a gravel driveway rebuild take, and when should it be done?
Most residential driveway rebuilds on West Slope properties take one to three days for a crew with the right equipment, not counting any permit review time. The best window for the work is late spring through summer, when soils have drained and the subgrade can be evaluated and corrected without working in standing water. Driveways rebuilt during the wet season often encounter saturated subgrade that cannot be properly compacted, which means the base may not reach design density before the surface aggregate goes on. Spring and summer scheduling also allows the completed base to consolidate through a dry period before the first winter traffic loads hit it.
