Geotextile Drainage Blanket
Filtration that prevents clogging and extends the drainage system's service life
The Scenario
Every underground drainage system faces the same long-term risk: clogging. In fine, silty or clayey soils, soil particles migrate with the water flow and accumulate inside the drain — reducing flow until the system stops working, usually years after the project is finished, when the cost of reopening the trench is already high.
The Bidim® geotextile blanket solves this as a filtration layer: it retains fine soil particles (separation function) while letting water flow freely (permeability function). Techduto manufactures the full line — from the non-woven filtration geotextile to the finished product, the drain pipe already fitted with the geotextile sleeve at the factory.
Techduto Solutions for Geotextile Drainage Blanket
Recommended lines, uses, and key features
| Line | Tensile strength | Drainage use |
|---|---|---|
| GT7 | 4.7 kN/m | Filtration in low mechanical stress drainage trenches |
| RT7 to RT10 | 7 to 10 kN/m | Filtration + light reinforcement — general drainage projects |
| RT14 to RT21 | 14 to 21 kN/m | Medium reinforcement — deep trenches, machine traffic on the area |
| RT26 and RT31 | 26 to 31 kN/m | Heavy reinforcement — infrastructure projects, highways, railways |
| CC10 | 5 kN/m | Concrete surface curing and protection |
Challenges & Solutions
How Techduto solves each challenge in Geotextile Drainage Blanket
Drain clogging in fine soil
The geotextile blanket retains fine soil particles (silt, clay) on the outside, keeping them from migrating into the pipe and reducing flow over the years.
Loss of efficiency under load
The RT14 to RT31 lines keep structural integrity even under machine traffic or highway load, without puncturing or tearing during installation.
Confusion between drainage blanket and waterproofing veil
The Bidim RT/GT line is for drainage and filtration — different from the VP line, which is a waterproofing veil (reinforcement for asphalt emulsion, not filtration).
Extra field application step
Techduto supplies the drain pipe already fitted with the geotextile sleeve at the factory — no need to wrap the blanket manually on site.
How We Apply
Techduto 3-step methodology
Soil analysis
Assessment of the soil grain size at installation depth — decides whether the area needs reinforced filtration or if Techdreno KC (no sleeve) already solves it.
Line specification
Choice of tensile strength (GT7 to RT31) based on the load over the trench — machine traffic, depth, project type.
Supply and installation
Blanket in rolls or pipe already fitted with the geotextile sleeve at the factory, ready to install — reduces field steps and execution error.
FAQ
Common questions about Geotextile Drainage Blanket
Why Techduto and not a reseller: since 1986, when it built Brazil's first corrugating machine by hand, Techduto has designed and manufactured its own line of corrugated pipes — it doesn't resell, it produces. Today, with factories in São José dos Campos (SP), Recife (PE) and Primavera do Leste (MT), the engineering behind Techdreno and Drainage Geocomposite is entirely its own. See our full history →