When selecting compound base mats for waterproofing or roofing systems, precise thickness and GSM (grams per square meter) specifications are key to ensuring compatibility, durability, and performance.
However, exact customization details—such as tailor-made thickness or coating weights—often depend on supplier data or project-specific requirements. Below, we summarize the typical ranges, influencing factors, and how to obtain exact specifications for your project.
Typical Market Ranges
Thickness:
Most compound base mats range from about 1 mm up to several millimeters, depending on both the base material and surface coating.
-
Fiberglass or polyester bases usually start around 1.0–2.5 mm.
-
Cementitious or bituminous coatings can significantly increase total thickness, with heavier options available upon request.
GSM (Mass per Unit Area):
Base mats commonly fall within tens to low hundreds of gsm, though reinforced and high-performance variants can exceed 300–900 gsm.
The final GSM value is determined by:
-
Base fabric density
-
Coating thickness and type
-
Reinforcement layers (if applicable)
Factors Influencing Thickness & GSM Options
-
Membrane System Compatibility
Whether you use SBS/APP modified bitumen or other waterproofing systems, the base mat must align with the membrane’s flexibility and bonding requirements. -
Substrate & Installation Conditions
Environmental factors like temperature, substrate moisture, and adhesion requirements directly affect the recommended thickness and GSM. -
Handling & Flexibility Needs
-
Lighter mats allow for easier handling and longer rolls.
-
Heavier mats offer enhanced durability but may require specialized installation tools.
-
How to Obtain Precise Specifications
To receive an accurate quotation or custom range, please share the following details:
-
The membrane system you plan to use (e.g., SBS/APP modified bitumen)
-
The substrate and installation environment (temperature, humidity, etc.)
-
Any specific flexibility or strength requirements
Once we have this information, we can:
-
Compare multiple supplier datasheets to identify standard and custom options
-
Prepare a concise supplier inquiry template requesting thickness/GSM ranges, MOQs, and lead times
-
Provide a comparison checklist tailored to your project conditions
Would you like us to prepare a targeted inquiry template or a side-by-side supplier comparison?
Contact Us
Weifang Guanlong Waterproof Material Co., Ltd.Your reliable partner for high-quality materials and professional support.
📞 Phone/WhatsApp: +86 18263668883
🌐 Website: glwaterproof.com/product/
📧 Email: guanlinguoji@126.com
