Dual Wall Corrugated Pipe for Underground Drainage System for Roof Run-Off
Dual Wall Corrugated Pipe for Underground Drainage System for Roof Run-Off We're running a downspout, an apartment building. We're using a dual wall corrugated pipe. It's smooth on the inside and corrugated on the outside. Very flexible, but yet rigid, strong. All right, let's go through the system so I can explain why we use [...]