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Dewitt Non-Woven Soil Filter Fabric 4oz (3' x 360')
Dewitt Non-Woven Soil Filter Fabric 4oz (3' x 360')
Dewitt Non-Woven Soil Filter Fabric 4oz (3' x 360')
Dewitt Non-Woven Soil Filter Fabric 4oz (3' x 360')

Dewitt Non-Woven Soil Filter Fabric 4oz (3' x 360')

SKU FF4OZ-3360
$436.16 - $436.16
$436.16
$436.16 - $436.16
$436.16
Free Shipping

Dewitt · Non-Woven Soil Filter Fabric · 4 oz

Dewitt 4 oz non-woven soil filter fabric on a 3′ × 360′ roll covering 1,080 square feet. A narrow roll in the 4 oz fabric, for pipe wraps and trenches with sharper stone. Needle-punched so water seeps through while soil is held back — keeping retaining wall backfill in place and drainage pipes clear of dirt.

Weight
4 ozHeavier backfill
Roll Size
3′ × 360′1,080 sq ft per roll
Part Number
FF4OZ-3360Brand: DeWitt
Fabric
Non-wovenNeedle-punched, not woven
  • Water seeps through, soil stays out
  • Keeps drainage pipes clear
  • Holds retaining wall backfill
  • Retains strength for many years
  • Free shipping on all orders

Free Shipping - Please submit a Quote Request for quantities larger than listed below.

Quantity Price Per Unit
(Free Shipping)
1 $436.16
2+ $414.35
3+ $392.54
10+ $370.74

01 Needle-punched non-woven · 3.1 to 6 oz

Dewitt Non-Woven Soil Filter Fabric

Soil filter fabric is the solution for two specific problems: holding soil behind retaining walls in place, and keeping drainage pipes from clogging with dirt. It does both by letting water through while stopping the soil that would otherwise travel with it.

The fabric is needle-punched and not woven, which is what allows water to seep through while still keeping dirt out. Its design contains and repels dirt from eroding into unwanted areas under the pressure of gravity and water movement — and it is ruggedly built to hold heavy soil loads back.

4weights · 3.1, 3.5, 4 and 6 oz

Eighteen roll sizes across the four weights, from 750 up to 4,500 sq ft per roll.

02 What it saves you

The Two Jobs You Never Want To Repeat

Installed correctly, this fabric means you are not digging up clogged drainage lines and not rebuilding retaining walls because of soil seepage. Both are expensive, both are avoidable, and both are caused by the same thing — soil going where only water should.

03 What you get

Benefits

  • Needle-punched fabric allows water to seep through while keeping soil out
  • Keeps soil behind retaining walls, out of drainage pipes and away from other buried parts
  • Ruggedly designed to keep heavy soil loads back
  • Contains and repels dirt from eroding into unwanted areas under gravity and water movement
  • Well constructed — retains its strength for many years
  • Four weights and eighteen roll sizes, so the fabric matches the job
  • Relied upon in thousands of projects, from small backyard drainage to large commercial sites
  • Non-woven, so water passes through the fabric body rather than only at the seams
Filtration is a two-part job. A fabric that stops soil but also stops water builds hydrostatic pressure behind a wall — which is what pushes walls over. A fabric that passes water but lets fines through clogs the drain it was protecting. Needle-punched non-woven does both halves at once, and that is the whole point of it.

04 Choosing

Which Weight Do I Need?

All four weights are the same needle-punched non-woven fabric and install the same way. Heavier means more strength and more puncture resistance for holding heavier soil loads back.

3.1 oz3 sizes 3.5 oz5 sizes 4 oz4 sizes 6 oz6 sizes
WeightSpecify it when
3.1 ozLight-duty drainage work — backyard french drains, small trenches, garden drainage in reasonable soil
3.5 ozGeneral drainage and wall backfill, and the widest choice of roll sizes including a 3′ and an 8′
4 ozA step up in strength for heavier backfill, sharper aggregate or larger residential and light commercial work
6 ozHeavy soil loads, taller walls, coarse or angular drainage stone, and commercial installations
Describe the backfill, not the wall. How heavy the soil load is and how angular the drainage stone is decide the weight far more than the height of the wall does. Call (800) 524-4161 and tell us both.

05 Roll sizes

All Eighteen Rolls

Narrow rolls suit trenches and pipe wraps; wide rolls suit wall backfill and large separation layers. Match the width to what you are lining and you cut both waste and seams.

3.1 oz — three sizes
Part numberRoll sizeSq ft
FF4360-3.14′ × 360′1,440
FF6360-3.16′ × 360′2,160
FF12.5360-3.112.5′ × 360′4,500
3.5 oz — five sizes
Part numberRoll sizeSq ft
FF3360-N3′ × 360′1,080
FF4360-N4′ × 360′1,440
FF6360-N6′ × 360′2,160
FF8360-N8′ × 360′2,880
FF12.5360-N12.5′ × 360′4,500
4 oz — four sizes
Part numberRoll sizeSq ft
FF4OZ-33603′ × 360′1,080
FF4OZ-43604′ × 360′1,440
FF4OZ-63606′ × 360′2,160
FF4OZ-12.536012.5′ × 360′4,500
6 oz — six sizes
Part numberRoll sizeSq ft
FF6OZ-32503′ × 250′750
FF6OZ-42504′ × 250′1,000
FF6OZ-62506′ × 250′1,500
FF6OZ43604′ × 360′1,440
FF6OZ12.536012.5′ × 360′4,500
FF6OZ1515′ × 300′4,500

06 Where it goes

Applications

Behind retaining walls Wrapping drainage pipe French drains Trench drains Around buried drainage parts Drainage stone separation Wall backfill Slopes & embankments Backyard drainage projects Large commercial sites
Dewitt has been manufacturing high quality landscape fabric for many years and produces some of the finest fabrics on the market, relied upon in thousands of projects ranging from small backyard drainage work to large commercial installations.

07 Installation

Getting It Right

The phrase that matters in the manufacturer's own description is if installed correctly. Filter fabric is unforgiving of shortcuts because the failure is invisible until the drain blocks or the wall moves.

Behind a wall: line the excavated face and the base before the drainage stone goes in, carrying the fabric up high enough that backfill soil cannot spill over the top edge into the stone. Then place the stone against it and backfill.

Around a drain: wrap the pipe and the surrounding stone completely, so water enters through the fabric from every direction and fines cannot reach the perforations. Overlap generously and never butt the joints.

The top edge is where installations fail. If the fabric stops below the level of the backfill, soil simply washes over the top and into the drainage stone — and the fabric below it makes no difference at all. Carry it up and fold it over.

08 Free shipping, every order

DeWitt Fabric Shipping

Shipping is free on every order, at any quantity. The map shows standard ground transit times for DeWitt fabric.

Transit times on the map are in business days, are approximate, and are specific to DeWitt fabric only. The day the order ships is not counted as a transit day.

Map of United States ground transit times in business days for DeWitt fabric orders

09 Buying from us

Why Buy Soil Filter Fabric From Landscape Discount

Genuine DeWitt product

DeWitt has been manufacturing high quality landscape fabric for many years. We never substitute another brand or fabric without the explicit consent of the customer.

Four weights, eighteen rolls

3.1 oz through 6 oz in widths from 3′ to 15′, so the fabric matches the job rather than matching what we happen to hold.

Straight answers on weight

Tell us the soil load and the drainage stone and we will tell you which weight covers it. Over-specifying costs money; under-specifying costs a drain or a wall.

We answer the phone

When you call you quickly reach a helpful, live person happy to answer your product and order questions. (M-F 5:00 am - 3:00 pm Pacific Time)

10 Common questions

Soil Filter Fabric FAQs

What does soil filter fabric actually do?
Two things at once: it lets water seep through, and it keeps soil out. That combination is what holds soil behind a retaining wall in place and stops drainage pipes clogging with dirt.
Which weight should I choose?
3.1 oz for light-duty drainage such as backyard french drains and small trenches. 3.5 oz for general drainage and wall backfill, with the widest choice of roll sizes. 4 oz for heavier backfill or sharper aggregate. 6 oz for heavy soil loads, taller walls, coarse angular stone and commercial work.
How much do I need?
Work out the area you are lining in square feet and match it to a roll — the eighteen sizes run from 750 up to 4,500 sq ft. Allow extra for overlapping the joints, which are not optional on a filter layer.
Why non-woven rather than woven?
Non-woven is needle-punched, so water passes through the body of the fabric rather than only at the weave. Woven fabric has higher tensile strength but far lower flow through the fabric, which is the wrong property for a filtration layer.
Does it go behind the wall or under the stone?
Both. Line the excavated face and the base before the drainage stone goes in, and carry the fabric up high enough that backfill soil cannot spill over the top edge into the stone.
How do I wrap a drainage pipe?
Wrap the pipe and the surrounding stone completely, so water enters through the fabric from every direction and fines cannot reach the perforations. Overlap the joints generously rather than butting them.
What is the most common installation mistake?
Stopping the fabric below the level of the backfill. Soil then washes straight over the top edge into the drainage stone, and the fabric below makes no difference at all. Carry it up and fold it over.
Can I use it as a weed barrier?
It is designed as a buried filtration and separation fabric rather than a surface product. For weed control in an exposed bed a woven weed barrier is the right tool, since it is built to be walked on, planted through and exposed to sun.
Will it clog over time?
A correctly specified and correctly installed filter fabric passes water while holding fines back at its face. Problems come from soil bypassing the fabric at the top edge or at open joints rather than from the fabric itself.
What does shipping cost?
Nothing. Shipping is free on every order, at any quantity.