The base, not the blade, decides whether artificial grass is flat in year five. A proper install removes the old lawn and 2–4 inches of soil, grades for drainage, lays a weed barrier, then compacts 3–4 inches of aggregate in lifts before the turf ever goes down. Ripples and dips trace back to an inadequate or under-compacted base. The warranty covers the fiber, never the prep — so the cheapest bid, which is cheap because it skipped base depth, is usually the most expensive turf you will ever buy.
Why does the base matter more than the turf?
Because the base is what holds shape over time, and the turf only follows it. The blade color, pile height, and face weight you compare in the showroom decide how the lawn feels on day one. The compacted aggregate underneath decides whether it is still flat, still draining, and still seamless in year five. A premium turf laid over a poor base fails; a mid-grade turf over a proper base holds. In this trade the honest line is short: the base is the entire job.
That is not a slogan — it is where the money and the failures both live. The price gap between two installers quoting the same Lake Havasu City yard is almost never the turf roll. It is base depth, compaction labor, and infill quantity, all of which are buried by the time you walk the finished lawn. Which is exactly why they are the first things to get cut on a low bid.
The proper install sequence, in order
A correct artificial grass install follows a fixed order, and skipping or thinning any step is where problems start. The sequence is excavate, grade, barrier, base, compact, turf, seam, anchor, infill. Each step depends on the one before it — you cannot fix a soft base with good seam work, and you cannot fix a poor grade with extra infill.
- Remove the old lawn and 2–4 inches of soil. Strip grass, roots, and enough native soil to make room for the aggregate base without raising the finished grade above walkways or door thresholds.
- Grade for drainage. Shape the subgrade so water runs to where you want it. In the desert the rain is rare, but a pet-rinse and the occasional monsoon still need somewhere to go.
- Lay the weed barrier. A geotextile barrier over the graded subgrade keeps weeds from pushing up through the seams later.
- Add 3–4 inches of aggregate. Class II road base or decomposed granite, spread evenly across the whole area.
- Compact in lifts. Run a plate compactor over the aggregate in layers, wetting as needed, until it is solid and dead flat. This is the step cheap installs cut.
- Lay, seam, and anchor the turf. Roll the turf the same nap direction, seam the panels, and anchor the perimeter and seams with nails or staples on the firm base.
- Infill. Brush in silica or coated sand to ballast the blades upright and protect the backing.
Base depth and compaction — the numbers that matter
A proper install uses roughly 3–4 inches of compacted aggregate — Class II road base or decomposed granite — over a graded, weed-barriered subgrade. Skipping base depth is the number-one reason cheap installs ripple and dip within a few years. The depth gives the surface structure; the compaction in lifts is what keeps that structure from settling unevenly under foot traffic and seasonal moisture.
Drainage is the second half of the base. Quality turf backings flow more than 30 inches of water per hour through their perforations, but that only helps if the base under them drains too and the subgrade was graded to move water out. A flat, non-draining base traps water at the seams — bad for the look, worse for a pet yard where odor and standing moisture compound. Good base prep is depth, compaction, and drainage together, not one of the three.
Infill — the part people forget
Infill is the silica or coated sand brushed down between the blades after the turf is laid, and it does two jobs: it ballasts the blades so they stand upright, and it shields the turf backing from UV. Under-infill a lawn and the blades mat down early and the backing degrades faster in the desert sun. It is cheap material, so when an installer skimps on it to win a bid, you pay for it in a lawn that looks tired years before it should.
Pet systems take this further with an antimicrobial infill and a more permeable backing to manage odor — a system, not just more sand. If you have dogs, the infill spec is part of the quote you should be reading, not an afterthought. More on that in our pet turf comparison.
Why the cheapest bid is the one that ripples
The cheapest bid almost always wins on price by carrying the lowest base depth and the least infill — the two costs the customer cannot see at handoff. The turf on top can be identical to the more expensive quote. What differs is buried, so the bid looks like a bargain right up until the base settles and the seams telegraph it.
We had a homeowner take the cheapest bid on a backyard a few years back. The installer laid turf over thin base with no real compaction. By the third year it had rippled and dipped at the seams, and the only fix was tearing it out and re-basing — the expensive way to learn the base is the job. The warranty did not help: a UV warranty covers the fiber fading, not a base that was never compacted. A 15-year warranty on turf laid over loose dirt is marketing, because the failure will be the base, and that is prep the manufacturer never touched.
When DIY actually works — and when it's a money pit
DIY turf can genuinely work for a small, flat, low-traffic area, as long as you respect the same sequence: excavate, grade, barrier, 3–4 inches of compacted aggregate in lifts, then seam and infill. Rent the plate compactor; do not skip it. Where DIY turns into a money pit is large yards, slopes, real drainage problems, or pet zones — exactly the situations where the base and drainage work is most of the labor and most of the ways it goes wrong. Those are the jobs that ripple when the prep is rushed.
If you are not sure which kind of yard you have, that is the honest first phone call. Related reading: lawn replacement and turf install, what actually drives artificial grass cost in Lake Havasu City, and the pet turf vs regular turf breakdown. Send a photo of the yard and we will tell you honestly whether turf pencils out — and which steps the base has to get right.