# Experimental Study and Application of TPO Waterproofing Membrane Lapping Process Parameters

## TL;DR

This paper studies the best parameters for welding TPO waterproofing membranes to ensure strong and watertight seams in construction projects.

## Contribution

The study determines optimal welding temperature, speed, and pressure for TPO membranes using peel and water impermeability tests.

## Key findings

- The optimal welding temperature for TPO membranes is 400 °C, where peel strength is maximized.
- The best welding speed is 4 m/min, and the optimal pressure is 14.97 N for strong seams.
- The water impermeability test confirms the effectiveness of the optimized parameters under various pressure conditions.

## Abstract

Taking the TPO waterproofing membrane as an example, this paper studies the influence of temperature, speed and welding pressure on the welding quality of a TPO waterproofing membrane lap area through a peel test and a water impermeability test, determines the optimal construction process, and observes and compares the permeable path through laser confocal microscope. Finally, it is applied to the actual effect test in the project. The results show that the welding pressure test tool for the lap area of the waterproofing membrane is designed to meet the welding work test requirements of various lap areas of the waterproofing membrane. The peel strength increases first and then decreases with the increase in welding temperature, and the optimal construction temperature is 400 °C. The optimal construction speed is 4 m/min; at 400 °C welding temperature, the peel strength increases first and then decreases slightly with the increase in welding pressure. The optimal construction pressure is 14.97 N; under the condition of 0.2 MPa, 30 min to 0.6 MPa, 120 min, the water impermeability test of the overlapping area was qualified. In this paper, the optimal construction technology of a TPO waterproofing membrane is determined, which provides guidance for its application and promotion in engineering.