Excavation and base work in Edmonton, depth that lasts
Almost every asphalt failure is a base failure wearing a surface. This is the part of a paving job nobody sees and the part that decides whether the visible half lasts ten years or two.
What your Edmonton asphalt base actually has to do
The granular layer spreads the weight of a vehicle over a wider area of ground and gives water somewhere to drain. When it is compacted properly it does both for decades. When it is not, it moves under load and the asphalt above it has nothing to sit on.
Compaction happens in layers for a reason. Material dumped to full depth and rolled once is dense at the top and loose underneath, and the loose part is what settles later. Thin lifts compacted in turn is slower and is what a base line on a quote is actually paying for.
Soft spots have to come out rather than be bridged. Paving over wet or organic ground buys one season, and the result is the sunken section that brings people back. Where that has already happened, replacement is what fixes it.
Graded base
How base work runs
How your Edmonton asphalt base is built
Dig to the depth the job needs
Excavation depth is set by what the surface will carry, so a lot taking delivery trucks comes out deeper than a drive carrying two cars.
Remove anything soft
Wet clay, organic material and old fill are taken out rather than compacted, because none of them gains strength no matter how many passes a roller makes.
Place and compact in lifts
Granular is placed in thin layers and each one is compacted before the next goes down, which is what produces density the whole way through.
Grade to the finished slope
The surface of the base is shaped to the fall the finished asphalt needs, because drainage is set here and cannot be corrected by the layer above.
Where it shows up
How Edmonton base failures show on the surface
Base problems announce themselves in three ways. Areas that sink, cracking that has joined into a network, and water that stands after rain. All three mean the same thing: the layer below has moved or was never dense enough.
Timing is the clue. A surface that failed within a few seasons of being laid almost always had a base problem from the start, while one that lasted fifteen years has simply reached the end. The normal lifespan is a useful comparison.
Water accelerates everything. Where drainage was never set correctly, the fall has to be fixed as part of any base work, or the new layer is on the same schedule as the old one. A winter does the rest.
Because it varies more than anything else. Two surfaces of the same area can need very different base work, and hiding that in a total makes two quotes impossible to compare.
It depends on the ground and the loads. A drive carrying cars and a yard taking loaded trucks need different depths, and the figure should be written down rather than assumed.
No. Asphalt is a wearing surface, not a structural layer. Extra depth over a weak base adds cost and weight without addressing the thing that is actually moving.
An area of wet, organic or poorly placed material that will not compact. It has to be dug out and replaced, because no amount of rolling turns it into something load-bearing.
Yes. Water that cannot run off will find a way under the surface and wash out the base from below, which is how a well-built surface can still fail in a few winters.
Only in small areas, by cutting out a section and rebuilding beneath it. Reworking the base under a whole surface means the surface has to come off first, which is why it is quoted as replacement.
The cracking pattern, the way water drains and the history of repairs tell us most of it before anything is dug. You get that read, and what acting on it would cost.
