THE IRON-CLAD TRUTH:
Made on American Soil. Made for American Soil.
Underground Installation
When it comes to underground installation, cast iron pipe and fittings have no equal. Installation is simpler, durability higher – up to 10x higher than comparable PVC – and you can trust that American-made cast iron meets the industry’s product standards. So when you’re determining the cost of your next project, remember this important truth: The cost of the material is NOT the cost of the installation.
Cast Iron Soil Pipe
This rigid material does not depend on sidefill stiffness, so the trench can be as narrow as the installer needs to make joint connections.
Thermoplastic Pipe
As a flexible material, plastic pipe is dependent on sidefill stiffness to limit deflections. ASTM D2321 recommends a trench width of the pipe outside diameter plus 16 inches. Additionally, special requirements for compaction and backfill material is needed to limit deflection.
Cast iron is up to 10x stronger than all thermoplastic counterparts, so it does not need the compaction of the sidefill to support the pipe wall.
Resources
View All
CISPI Brochure
All too often, the perceived cost advantages of plastic over cast iron are not what they seem. This brochure will help it all make sense, by comparing six areas that can add cost and complexity: fire resistive construction, crush and deflection underground, thermal expansion/
CISPI Cast Iron Soil Pipe & Fittings Handbook
This newly updated handbook features the latest technical specs, installation guides, manufacturing details, layouts and other useful information for putting cast iron soil pipe and fittings to work for you.
CISPI 301
Standard specification for hubless cast iron soil pipe and fittings for sanitary and storm drain, waste and vent piping applications.