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Washington WSDOT  Geotextile Fabrics

Miragrid 2XT Geogrid
Mirafi 2XT Geogrid
Washington WSDOT - 9-33.2(2) - Geogrid - 12' x 150' Roll - 2XT
Miragrid 2XT Geogrid
Mirafi 2XT Geogrid
Washington WSDOT - 9-33.2(2) - Geogrid - 12' x 150' Roll - 2XT

Washington WSDOT - 9-33.2(2) - Geogrid - 12' x 150' Roll - 2XT

$1,221.58
Mirafi G100N Drainage Composite
Washington WSDOT - Prefabricated Drain Mat - Table 8 - 4' x 50' Roll - G100N
Mirafi G100N Drainage Composite
Washington WSDOT - Prefabricated Drain Mat - Table 8 - 4' x 50' Roll - G100N

Washington WSDOT - Prefabricated Drain Mat - Table 8 - 4' x 50' Roll - G100N

$510.47
Mirafi FW700 Geotextile Fabric
Washington WSDOT - Ditch Lining Fabric - Table 4 - Woven - 12' x 300' Roll - FW700
Mirafi FW700 Series Geotextile Fabric
Mirafi FW700 Geotextile Fabric
Washington WSDOT - Ditch Lining Fabric - Table 4 - Woven - 12' x 300' Roll - FW700
Mirafi FW700 Series Geotextile Fabric

Washington WSDOT - Ditch Lining Fabric - Table 4 - Woven - 12' x 300' Roll - FW700

$2,160.87
Mirafi 600X Geotextile Fabric
Mirafi 600X Geotextile Fabric

Washington WSDOT - Separation Geotextile Fabric - Table 3 - Woven - 15' x 300' Roll - 600x

$1,244.59
Mirafi 160N Geotextile Fabric
Mirafi 160N Geotextile Fabric
Mirafi 160N Geotextile Fabric
Mirafi 160N Geotextile Fabric

Washington WSDOT - Ditch Lining Fabric - Table 4 - Nonwoven - 15' x 300' Roll - 160N

$1,440.03
Mirafi 160N Geotextile Fabric
Mirafi 160N Geotextile Fabric
Mirafi 160N Geotextile Fabric
Mirafi 160N Geotextile Fabric

Washington WSDOT - Permanent Erosion Control Fabric - Moderate Survivability - Class A, B, & C - Nonwoven - 15' x 300' Roll - 160N

$1,440.03
Mirafi 160N Geotextile Fabric
Mirafi 160N Geotextile Fabric
Mirafi 160N Geotextile Fabric
Mirafi 160N Geotextile Fabric

Washington WSDOT - Underground Drainage Fabric - Moderate Survivability - Class A, B, & C - Nonwoven - 15' x 300' Roll - 160N

$1,440.03
Mirafi 180N Geotextile Fabric
Mirafi 180N Fabric
Mirafi 180N Geotextile Fabric
Mirafi 180N Fabric

Washington WSDOT - Permanent Erosion Control Fabric - High Survivability - Class A, B, & C - Nonwoven - 15' x 300' Roll - 180N

$1,590.62
Mirafi 180N Geotextile Fabric
Mirafi 180N Fabric
Mirafi 180N Geotextile Fabric
Mirafi 180N Fabric

Washington WSDOT - Soil Stabilization Geotextile Fabric - Table 3 - Nonwoven - 15' x 300' Roll - 180N

$1,590.62
Mirafi 180N Geotextile Fabric
Mirafi 180N Fabric
Mirafi 180N Geotextile Fabric
Mirafi 180N Fabric

Washington WSDOT - Separation Geotextile Fabric - Table 3 - Nonwoven - 15' x 300' Roll - 180N

$1,590.62
Mirafi 180N Geotextile Fabric
Mirafi 180N Fabric
Mirafi 180N Geotextile Fabric
Mirafi 180N Fabric

Washington WSDOT - Underground Drainage Fabric - Low Survivability - Class C - Nonwoven - 15' x 300' Roll - 180N

$1,590.62
Mirafi 140N Geotextile Fabric
Mirafi 140N Fabric
Mirafi 140N Geotextile Fabric
Mirafi 140N Fabric

Washington WSDOT - Underground Drainage Fabric - Low Survivability - Class A & B - Nonwoven - 12.5' x 360' Roll - 140N

$1,266.67
Mirafi FW404 Geotextile Fabric
Washington WSDOT - Soil Stabilization Geotextile Fabric - Table 3 - Woven - 15' x 300' Roll - FW404
Mirafi FW404 Series Geotextile Fabric
Mirafi FW404 Geotextile Fabric
Washington WSDOT - Soil Stabilization Geotextile Fabric - Table 3 - Woven - 15' x 300' Roll - FW404
Mirafi FW404 Series Geotextile Fabric

Washington WSDOT - Soil Stabilization Geotextile Fabric - Table 3 - Woven - 15' x 300' Roll - FW404

$2,415.90
Mirafi FW404 Geotextile Fabric
Washington WSDOT - Underground Drainage Fabric - Moderate Survivability - Class A - Woven - 15' x 300' Roll - FW404
Mirafi FW404 Series Geotextile Fabric
Mirafi FW404 Geotextile Fabric
Washington WSDOT - Underground Drainage Fabric - Moderate Survivability - Class A - Woven - 15' x 300' Roll - FW404
Mirafi FW404 Series Geotextile Fabric

Washington WSDOT - Underground Drainage Fabric - Moderate Survivability - Class A - Woven - 15' x 300' Roll - FW404

$2,415.90
Mirafi FW404 Geotextile Fabric
Washington WSDOT - Underground Drainage Fabric - Low Survivability - Class A - Woven - 15' x 300' Roll - FW404
Mirafi FW404 Series Geotextile Fabric
Mirafi FW404 Geotextile Fabric
Washington WSDOT - Underground Drainage Fabric - Low Survivability - Class A - Woven - 15' x 300' Roll - FW404
Mirafi FW404 Series Geotextile Fabric

Washington WSDOT - Underground Drainage Fabric - Low Survivability - Class A - Woven - 15' x 300' Roll - FW404

$2,415.90
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Solmax DOT Standard Specification Product Chart (click image to expand)

Washington WSDOT  - Geotextile Uses

Washington projects span saturated coastal marshes and tidal flats around Puget Sound, dense glacial tills and outwash on the lowlands, lahar- and ash-derived soils near volcanoes, steep Cascade passes, and arid basins east of the mountains. Add “atmospheric river” rain events, spring snowmelt, wildfire burn scars that shed debris, and freeze–thaw in the interior, and you get subgrades that can soften, pump fines, rut, scour, or settle. Geotextiles are the quiet engineering layer that helps pavements, structures, and drainage systems keep performing.

Separation and stabilization. On new lanes, shoulder widenings, and rehab work, WSDOT commonly places a woven geotextile between native subgrade and granular base. The fabric stops fine soils—glacial silts, clayey tills, and coastal sands—from migrating into the aggregate under traffic, spreads loads, and preserves base thickness. Where subgrades are very soft or saturated (marsh edges, floodplain approaches, utility cuts), crews first roll out geotextile to create a working platform so haul trucks and pavers don’t punch through. On exceptionally weak ground, fabric is often paired with a geogrid to boost stiffness and speed construction.

Filtration and drainage. Water drives many failures west of the Cascades and after cloudbursts east of them. Nonwoven geotextiles line underdrain and edge-drain trenches, wrap perforated pipe, and separate drainage stone from surrounding soils behind retaining walls and backwalls. Matching apparent opening size (AOS) and permittivity to local soils—tight tills on the Puget Lowland versus cleaner sands in river terraces—lets water move while fines stay put, reducing clogged outlets, wet spots, and shoulder drop-offs. In cold districts, a nonwoven over open-graded aggregate also forms a capillary break, limiting upward moisture that fuels frost heave and weakens base layers in winter.

Riprap underlayment and scour control. Where flows concentrate—culverts, storm outfalls, river bends, and coastal works—geotextiles serve as underlayment beneath riprap or armor stone. A robust nonwoven filter is placed on the prepared bed or slope before rock placement. It prevents subgrade soils from piping through rock voids during high velocities, tidal drawdown, and debris-laden floods, helping the armor “lock in” and protecting embankments at bridge approaches and channel transitions on rivers such as the Skagit, Snohomish, Yakima, and Columbia.

Structures and MSE walls. WSDOT corridors include many mechanically stabilized earth (MSE) walls and grade separations. Geotextiles act as joint and face filters, tucked behind panel or modular block joints so backfill fines don’t migrate to the face while preserving drainage continuity. The same concept applies at wingwalls, backwalls, and around penetrations, where a filter layer protects weeps and outlets without trapping water.

Pavement interlayers. Asphalt-impregnated nonwoven geotextile under overlays improves waterproofing and slows reflective cracking—important where heavy rain, studded tires in mountain passes, and wide thermal swings accelerate pavement aging. On chip seals used in preservation, paving fabrics limit water intrusion into the base and subgrade with minimal added thickness.

Temporary erosion and sediment control. During construction, geotextiles appear in silt fence, curb socks, inlet protection, and check structures. They filter runoff while trapping fines—critical for stormwater compliance in salmon-bearing watersheds and urban corridors. At site entrances, stabilized construction exits typically include a nonwoven geotextile beneath coarse stone; the fabric spreads wheel loads and prevents the rock from punching into wet soils, reducing track-out.

Liner protection and containment. Heavy nonwoven geotextiles cushion geomembranes in stormwater ponds, lined swales, salt- and sand-shed pads, and deicing-brine containment, protecting liners from puncture by angular aggregate and construction traffic.

Field practice that makes it work. Prepare subgrades smooth, remove protrusions, avoid wrinkles; orient rolls correctly; lap or sew seams as required (more overlap on very soft ground); anchor with pins or the first lift; and cover promptly to limit UV, rain, and construction damage. Selection stays function-driven—woven for stabilization and tensile capacity; nonwoven for filtration, drainage, and protection—tuned to Washington’s soils, hydraulics, and traffic demands.

Bottom line: on WSDOT projects, geotextile isn’t “landscape fabric.” It’s a purpose-chosen engineering layer that stabilizes variable subgrades, controls water and fines through extreme wet seasons and freeze–thaw, protects structures and channels, and stretches pavement service life statewide.

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Washington WSDOT