Materials for drainage, waterproofing and civil engineering
Introducing CHIHAI: Materials for Drainage, Waterproofing and Landscape Projects
Get to know our material range and the project information that helps us support your next enquiry.
The Short Answer
CHIHAI brings together a range of geosynthetic materials for water management, barrier systems and landscape construction. Our work starts with matching the role of each material to the project requirements.
A Product Range Built Around Material Functions
Our company materials describe Langfang Runwan Plastic Products Co., Ltd. as a business combining geosynthetic material development, production, sales and construction services. Based in Wen’an, Langfang, Hebei, the company focuses on drainage, water storage and seepage-control applications.
The range includes HDPE dimpled drainage boards, HDPE geomembranes, water storage drainage boards, nonwoven geotextiles and recycled HDPE granules. Landscape products such as grass paver grids and tree wrap complement this range. Each product has a different role, so selection begins with the function required in the construction assembly.
| Material family | Typical role | What to discuss |
|---|---|---|
| Drainage boards and cells | Provide space for water movement or storage | Profile, loading conditions and discharge route |
| Geomembranes | Act as a low-permeability barrier | Material grade, thickness and joining requirements |
| Geotextiles | Support filtration, separation or protection | Soil compatibility and required performance |
| Recycled HDPE granules | Feed plastic board and geosynthetic manufacturing | Material grade, color and extrusion requirements |
From Materials to Applications
Our stated focus includes environmental barrier systems, roof greening, landscape construction over underground structures and drainage or salt-removal works. We discuss how the materials connect to the surrounding structure and how water leaves the system, rather than treating a roll or panel as an isolated item.
For a planted deck, that may involve discussing the filter fabric, drainage layer, protection and waterproofing together. For a below-ground wall, it means understanding the wall surface, backfill, drainage path and outlet. The project designer remains responsible for the final assembly and performance requirements.
How to Start a Product Enquiry
Share the application
Tell us whether the material is for a basement wall, roof garden, landscape deck, lining system or other use.
Send the specification
Include the material type, dimensions, required tests and any relevant project drawings.
Confirm the supply scope
Provide the quantity, destination, packaging preferences and required delivery schedule.
Discuss compatibility
Identify the adjacent layers and the installation method so the proposed materials can be reviewed together.
Common Questions
Can several materials be supplied for one project?
Our range covers complementary material functions. Send the complete material schedule so the required combinations can be discussed.
Where can I discuss my project?
Use the enquiry form below or visit our Contact page to share your drawings, quantities and destination.
Products
Explore Geosynthetic Materials
Related Reading
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Choosing a Drainage Board for Foundations
Match the drainage board, filter layer and outlet arrangement to the needs of a below-ground wall.
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Roof Garden Drainage Layer Guide
Explore the roles of filtration, drainage, protection and waterproofing beneath a planted roof or landscape deck.
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Need Help with Your Project?
Share your application, material specifications and quantity with our team.