The cost to replace cast iron pipes with PVC significantly varies depending on factors such as the scope of the project, local labor rates, and the size of the pipes. On average, homeowners might spend between $2,500 to $15,000 for a full replacement. This cost disparity is due to the complexity of the job, which can include excavation, removal of the old pipes, installation of new PVC piping, and restoration of the affected areas. PVC pipes are favored for their durability, resistance to corrosion, and lower material costs compared to cast iron. Before proceeding, it's essential to get multiple quotes from professional plumbers to understand the full scope and cost of the project. Local building codes and permits may also affect the overall price.

Low-Density Polyethylene (LDPE) is a thermoplastic made from the monomer ethylene via a free radical polymerization process at high pressure. Its structure is characterized by a less compact and more branched configuration compared to High-Density Polyethylene (HDPE), resulting in its lower density. These short and long chain branches give LDPE its distinctive properties such as flexibility, toughness, and transparency. The branching occurs due to the conditions under which LDPE is synthesized, involving lower temperatures and pressures than those used for HDPE. This loosely packed structure accounts for its low density, as the material occupies more volume for the same mass of polymer. LDPE is widely used for applications requiring flexibility and durability, such as plastic bags, containers, films, and tubing.

For bonding wet PVC pipes, solvent cement designed specifically for wet conditions is ideal. Traditional PVC cement often requires a dry surface, but wet condition solvent cements, also known as 'wet or dry' cements, are formulated to work even in damp environments. These adhesives undergo a chemical reaction with the PVC, creating a strong bond that can handle moisture. Always ensure the surface is as dry as possible and clean from dirt or grease for the best results. An example of such a product is Oatey Rain-R-Shine Medium Blue PVC Cement. Despite being suitable for wet conditions, it’s important for the pipe to not be fully submerged or under pressure during the curing process.