This drawing is to demonstrate a simple and inexpensive method of taking heat from one building to another or to protect underground pipes from freezing, by using 4" flexible corrugated drain pipe for a conduit.
THIS METHOD ALLOWS YOU TO REPLACE LINES OR WIRES WITHOUT DIGGING
AN EVEN BETTER METHOD IS TO COVER THE CORRUGATED PIPE WITH RIGID SPRAY FOAM RIGHT IN THE DITCH.
Spray on Foam / Trench Foam Products
Spray polyurethane foam has an aged R-Value of approximately 7.0 per one inch thickness (depending upon application). It provides more thermal resistance with less material than any other type of commercial insulation.
