What a weed membrane is actually for
It's easy to assume the stabilising grid our gravel guide already prices and a fabric membrane are two versions of the same product. They're not, and they don't do the same job. The grid is plastic cells that sit inside the gravel layer itself, holding stone in place against vehicles and rain so it stops migrating sideways toward the edges, the exact failure mode behind that guide's own topping-up figure. A membrane is a fabric sheet laid flat underneath the whole gravel layer, between the stone and the soil, and its real job is separation: stopping fine soil particles from working their way up into the gravel, and stopping the gravel itself from slowly sinking into softer ground underneath. Bovees' own driveway-base guide calls this “pumping” or “fines intrusion”, the hidden cause behind ruts and soft spots that “seem to appear from nowhere” years after a gravel driveway goes down, when the real cause sat at the bottom of the base since the day it was built. A membrane addresses that slow, downward failure; the grid addresses the faster, sideways one. A driveway could reasonably use both.
What it actually costs
Same 6 m × 3 m driveway strip (18 m²) our gravel guide's own worked example uses, priced at each retailer's own published rate per square metre.
| Option | What it includes | Cost |
|---|---|---|
| Budget non-woven mat, installed once | Saxon 0.9m×10m Non Woven Weed Control Mat, 2 rolls at $1.59/m² | $29 |
| Budget non-woven mat, over 10 years | Relaid roughly every 2 to 4 years as it tears and degrades, 3 to 5 layings total | $87–$145 |
| Digging up & relaying the gravel for each remat (labour only) | All Stake Supply's own $40–$80/m² professional gravel-driveway labour rate, applied to our 18 m² strip for the 2 to 4 remats the mat above needs | $1,440–$5,760 |
| Budget mat, full 10-year total incl. relaying labour | Mat cost above plus the labour to dig up and relay the gravel each time, a cost the mat price alone doesn't show | $1,527–$5,905 |
| Commercial 140gsm woven fabric, installed once | Strol Landscape Pro 120, tear-resistant, rated for use under sharp stone, at $2.45/m² | $44 |
| Commercial 140gsm woven fabric, over 10 years | No relaying needed inside a 10-year window on the retailer's own rating | $44 |
The 10-year figures assume the cheap non-woven mat is relaid at the midpoint of its own 2-to-4-year rated life; the heavier 140 gsm fabric is rated to outlast the full 10-year window once, so its 10-year total is the same as its install cost.
Cheap matting costs more over time, and does a worse job of the one thing people buy it for
On the numbers above, the heavier commercial fabric is the cheaper buy over any real ownership period, the same “budget option isn't actually cheaper” shape this site's other DIY-vs-hire guides keep finding. Saxon's basic non-woven mat, the kind sold for garden beds, runs $1.59 a square metre but is rated for only 2 to 4 years before it tears and needs relaying, per AllStakeSupply's own weight-based lifespan table for weed matting in Australian conditions. Relay it two to four more times over a decade and the mat's own cost climbs to $87 to $145. Strol's Landscape Pro fabric, a 140 gsm woven product Bunnings markets specifically as “tear-resistant, ideal for use under sharp stones” and backs with a 10-year warranty, sits above AllStakeSupply's own 110-to-130 gsm bracket, rated at 10 to 15 years. Buried under a compacted gravel layer rather than left exposed the way a garden application often is, it's a reasonable one-off cost across the full 10-year window this table compares.
The real gap is bigger once the digging is counted
Relaying a mat means digging the existing gravel off the strip, laying the new mat, then putting the gravel back on top, real labour that costs money even when the mat itself is cheap. AllStakeSupply's own separate driveway cost guide puts professional gravel-driveway labour at $40 to $80 a square metre, so a single dig-up-and-relay across our 18 m² strip runs $720 to $1,440, and the budget mat needs two to four of those over a decade. Add that to the mat's own $87 to $145 and the honest 10-year cost of the cheap option is $1,527 to $5,905, well past the $87 to $145 the mat price alone suggests. That's enough to make the commercial fabric's one-off $44 look cheap rather than merely competitive. Hiring a landscaper isn't the only option: doing the digging yourself skips that cost, though not the two to four weekends of lifting and relaying gravel it takes over a decade, against a mat that costs $15 more once and never needs touching again.
Neither grade stops weeds on its own. A membrane only blocks roots reaching up from the soil below. It does nothing about windblown seed that lands and roots in the dust and organic debris that settles on top of any gravel driveway over the years, and Bunnings' own weed-matting advice is candid that it “stops some weeds” rather than all of them. House Digest's review of the same product found something worse than that in one respect: once seeds do root on top of a fabric layer, their roots tangle into the mesh as it degrades, and a weed rooted into degraded mesh is genuinely harder to pull than the same weed growing straight into bare gravel. Its own advice, use the heaviest fabric available, is the same conclusion this page's own numbers land on for a different reason. Regularly clearing leaves, dust and soil off the surface does more for a weed-free gravel driveway than which fabric sits underneath it.
Common questions
Does a weed membrane stop weeds growing through a gravel driveway?
Only partly. It blocks weed roots reaching up from the soil underneath, but does nothing about windblown seed that lands and roots in dust and debris that settles on top of the gravel over time. Bunnings' own advice on weed matting is that it stops some weeds, not all of them, and a degrading mesh can actually make surface weeds harder to pull once their roots tangle into it.
What's the difference between a weed membrane and the stabilising grid in your gravel driveway guide?
Different products doing different jobs. The stabilising grid sits inside the gravel layer and holds stone in place against vehicles and rain, cutting how often the driveway needs topping up, our gravel vs concrete vs pavers guide prices that. A weed membrane sits underneath the whole gravel layer, on the soil, and stops fine soil migrating up into the gravel or the gravel itself sinking into soft ground over years, a separate, slower failure mode.
Is cheap weed matting worth buying for a gravel driveway?
Not on the numbers, no. A budget non-woven mat for our 18 m² worked strip costs $29 but is rated for only 2 to 4 years, relaying it over a decade brings the mat's own cost to $87 to $145. A heavier 140 gsm commercial fabric costs $44 once and is rated to outlast a full 10-year window without a single relaying.
Does relaying a cheap weed mat cost more than the mat itself?
Yes, usually by a wide margin. Relaying means digging up the existing gravel, laying the new mat, then putting the gravel back, and AllStakeSupply's own published rate for that professional gravel-driveway labour is $40 to $80 a square metre. Applied to our 18 m² strip across the 2 to 4 remats the budget mat needs over a decade, that's $1,440 to $5,760 in labour on top of the mat's own $87 to $145, an honest 10-year total of $1,527 to $5,905 against the commercial fabric's one-off $44.
Does the same 'check the real numbers before assuming which option costs less' pattern show up anywhere else on this site?
Yes, painting runs into a mirror version of it. Our paint coats guide finds the opposite intuition breaks down there: adding a primer coat, the step that looks like the safe extra spend, actually costs more ($130–$156) than skipping it for a third topcoat ($63–$90), the reverse verdict to weed matting here (the cheap option costs more, not less) but the same underlying discipline: don't trust the sticker price, do the sum.
Sources
Weed mat lifespan by fabric type and gsm weight, and the cost case for a heavier fabric: All Stake Supply, How Long Does Weed Mat Last?, the same supplier our gravel vs concrete vs pavers guide already cites. Professional gravel-driveway labour cost ($40–$80/m²), the figure behind this page's own dig-up-and-relay estimate: All Stake Supply, How Much Does a Gravel Driveway Cost?. Budget non-woven mat pricing: Bunnings, Saxon 0.9 x 10m Non Woven Weed Control Mat. Commercial 140gsm fabric pricing, tear-resistance and warranty: Bunnings, Strol 2 x 20m Landscape Pro 120 Weedmat. Fines-intrusion/separation function of geotextile fabric under gravel: Bovees, Geotextile Fabric for Gravel Driveway Bases. Weed matting's own limits and installation advice: Bunnings, How To Install Weed Matting. Roots tangling into a degrading mesh: House Digest, Why Landscaping Fabric Isn't a Long-Term Solution for Preventing Weeds in Gravel. Worked driveway strip and reinforcement-grid figures: same sourcing as our gravel vs concrete vs pavers guide, linked above. All fetched July 2026.