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A Comprehensive Guide to Soft Backer Rod

July 07, 2023

Backer rods are increasingly popular among contractors. They use this versatile tool made of polyethylene foam to ensure that the doors and windows are firmly attached to their frames. Backer rods guarantee no gaps or drafts between the door or the window screens and their frames, thus allowing for easier climate control within your home. There are different types of backer rods available in the market, each with different characteristics and features. In this blog, we discuss in brief about soft backer rods. Read until the end to learn all about this versatile material.

What are the benefits of using a soft backer rod?

  • One of the primary advantages of using a soft backer rod is its ability to provide an effective seal against air, moisture, and sound infiltration. Filling gaps and voids between surfaces with soft foam rods prevents drafts and reduces energy loss.

  • In addition to insulation properties, it also acts as a cushioning material. When used in construction joints or expansion joints, it helps absorb movement caused by thermal fluctuations or structural shifts. This not only enhances the durability of the structure but also minimizes potential cracking or damage over time.

  • Soft rod proves useful during caulking or sealing projects. It serves as a backup filler behind sealants to ensure proper joint depth and width for optimal adhesion. This results in more reliable seals that are resistant to weathering and degradation.



A soft backer rod is a versatile and valuable tool for various applications in construction and sealing. Its benefits, such as proper joint filling, sound absorption, thermal insulation, and flexibility make it an ideal choice for many projects. To reap the benefits of backer rods, however, it is crucial to buy them only from trusted suppliers and manufacturers. Alcot Plastics Ltd. is a leading manufacturer of polyethylene foam products like backer rods and screening splines, among others. Contact us today to learn about our wide range of products.