Laying weed mat under gravel is the single most effective way to stop weeds from pushing through driveways, pathways and garden beds. Without a barrier between the soil and the aggregate, weed seeds germinate in the moist layer beneath the stone and force their way up within weeks.
The right weed mat blocks light, lets water drain through, and keeps your gravel surface clean for years. The wrong choice tears during compaction, traps water, or breaks down before the job pays for itself.
This guide covers why weed mat belongs under every gravel surface, which type and weight to choose, and how to install it properly. All Stake Supply has stocked weed mat products from their St Marys NSW warehouse for over 48 years.
Gravel on bare soil looks good for about a month. Then weeds appear. Seeds blow in, settle between stones, and germinate in the damp soil underneath. Without a physical barrier, you end up pulling weeds from gravel every few weeks or spraying herbicide repeatedly.
A layer of weed mat between the soil and the gravel solves four problems at once.
Already have a gravel area with weed problems? You can lift sections of gravel, lay weed mat underneath, and replace the stone. It is more work than doing it right the first time, but still worth it. See our guide on how to lay weed mat for the full process.
Not every weed mat suits gravel applications. The fabric needs to handle the weight of aggregate, resist puncture from angular stones, and last for years without UV degradation.
Woven polypropylene (PP) is the standard choice for under-gravel installations. The interlocked weave creates a strong, tear-resistant sheet that lets water drain through while blocking light. For residential paths and garden beds, 85gsm woven weed mat (1.83m x 50m) handles the job well. For driveways and high-traffic areas, step up to 110gsm woven weed mat (5m x 100m) for extra puncture resistance.
Nonwoven geotextile is a bonded synthetic sheet with higher puncture resistance than woven fabric. It works well under driveways that carry vehicle traffic, but drains more slowly than woven mesh. Use it when the primary concern is preventing gravel from mixing into a clay subgrade rather than weed suppression alone.
Never use solid plastic sheeting under gravel. Black builders film, tarps and polyethylene sheets block water completely. Rainwater pools on the surface, the gravel shifts, and the soil underneath goes anaerobic. If you need to understand more about what works and what does not, read does weed mat work for a detailed breakdown.
Use this table to match the right product to your project.
| Application | Recommended Mat | Minimum GSM | Gravel Depth | Expected Lifespan |
|---|---|---|---|---|
| Garden bed with decorative pebbles | Woven PP | 85gsm | 50mm | 5 to 10 years |
| Residential pathway | Woven PP | 85gsm | 50 to 75mm | 8 to 12 years |
| Gravel driveway (cars) | Woven PP or nonwoven geotextile | 110gsm | 75 to 100mm | 10 to 15 years |
| Commercial car park | Nonwoven geotextile | 150gsm+ | 100 to 150mm | 15 to 25 years |
| Temporary access track | Woven PP | 85gsm | 50mm | 3 to 5 years |
Proper installation makes the difference between a gravel area that stays clean for a decade and one that grows weeds within months. If you have not laid weed mat before, our full weed mat installation guide covers the basics.
Remove all existing weeds, grass and debris from the area. For persistent perennial weeds like couch grass or kikuyu, treat with a non-selective herbicide and wait for full die-off before laying any fabric. The Australian Department of Agriculture provides guidance on identifying and managing common invasive weed species.
Rake the soil level and remove sharp rocks or roots that could puncture the mat. On soft or uneven ground, compact the subgrade with a plate compactor or hand tamper before continuing.
Unroll the weed mat across the prepared surface. Where two sheets meet, overlap them by at least 150mm. On driveways and high-traffic areas, increase the overlap to 200mm.
Cut the mat with a sharp utility knife. Leave a 50mm upturn along any edges that meet a hard surface like a retaining wall, edging strip or building foundation. This creates a tray that stops gravel from spilling out and prevents weeds from creeping in at the edges.
Secure the mat with steel fastening pins every 300 to 500mm along edges, joins and any cuts. Use three pins per square metre across the main body of the mat.
On slopes, pin every 300mm and lay sheets from top to bottom so the upper sheet overlaps the lower one. This lets water flow over the join rather than underneath it.
Use a wheelbarrow to distribute gravel across the mat. Do not dump a full load onto one spot because the concentrated weight can tear the fabric. Spread each load with a rake as you go.
For gravel driveways that need extra stability, lay an EconoGrid40 porous paving grid over the weed mat before filling with gravel. The honeycomb cells lock the aggregate in place and prevent ruts from forming. Read more in our guide on how to make a gravel driveway solid.
These are the errors we see most often. For a broader list, read our article on common mistakes to avoid when using landscape fabric.
A properly installed weed mat under gravel requires very little upkeep. Any weeds that do appear are usually growing in organic debris that accumulates on top of the gravel, not pushing through the mat itself.
Permeable ground cover fabrics also play a role in stormwater management. The CSIRO notes that permeable surfaces reduce urban stormwater runoff, which is one reason councils and developers specify woven weed mat under gravel rather than solid plastic.
All Stake Supply stocks woven polypropylene weed mat in multiple widths and weights from their St Marys NSW warehouse. One order, complete delivery anywhere in Australia. Contact the team for trade pricing and bulk orders.
Yes. Weed mat under gravel prevents weed growth, stops the aggregate from sinking into the soil, and reduces long-term maintenance. It is standard practice for driveways, pathways and decorative gravel areas across Australia.
Woven polypropylene weed mat at 85gsm or above is the best choice for most gravel applications. It is strong, permeable, UV stabilised, and lasts 5 to 15 years. For heavy vehicle traffic, use 110gsm or a nonwoven geotextile.
Install weed mat before laying the gravel and maintain a minimum gravel depth of 50mm. Remove leaf litter regularly so organic matter does not build up on the surface and create a growing medium for wind-blown seeds.
Weed mat should go underneath the gravel, not on top. Placing it on the surface creates a trip hazard, looks untidy, and exposes the fabric to UV degradation. If weeds are already a problem, lift the gravel, lay the mat on the cleared soil, then replace the stone.
Woven polypropylene weed mat lasts 5 to 15 years under gravel depending on the GSM weight, UV exposure at edges, and the type of aggregate above it. Heavier mats (110gsm and above) consistently outlast lighter ones.
Yes. Pebbles are lighter than crushed gravel and provide less compression on the soil, which makes it even easier for weeds to push through. Always lay weed mat before spreading decorative pebbles.
