PDS Threshold

The PDS Threshold Seal is designed to provide a reliable soundproofing and sealing solution for doors installed over uneven floors or carpeted surfaces. If the gap beneath your door slab is less than 1/2", the PDS Threshold can be used as a standalone door seal. However, for maximum acoustic performance, it is most effective when paired with an Automatic Door Bottom (ADB Surface or ADB Mortised).

Unlike a standard threshold, the PDS Acoustic Threshold creates seal redundancy and a dead air space between the door bottom seal and the threshold seal, significantly improving STC performance and reducing sound transmission through the door assembly. This makes the PDS Threshold ideal for recording studios, offices, theaters, and residential soundproofing applications requiring superior door acoustics and durability.

Each PDS Threshold Acoustic Door Seal includes all required fasteners and detailed manufacturer installation instructions. Below is a brief overview of the installation process.

1. Measure and trim: Verify the threshold width between the door jambs. Trim the threshold if needed to ensure a precise fit.
2. Adjust the foam seal: Trim the foam gasket so it is flush with the sides or extends no more than 1/16 inch beyond the edges.
3. Position the threshold: Place the PDS Threshold under the door, then close the door and adjust the position until the foam seal makes full, even contact with the bottom of the door slab under light compression.
4. Secure the threshold: Open the door to confirm alignment, then fasten the threshold to the floor using the included manufacturer screws.

Proper installation ensures a complete acoustic seal and maintains the maximum STC and IIC performance of your soundproof door assembly.

The PDS Threshold acoustic door seal is stocked in a standard 36 inch and 72 inch length and ships in these sizes by default.

For most projects, we recommend cutting the threshold on-site rather than ordering a pre-cut version. The soft aluminum construction allows the PDS Threshold to be easily trimmed with a standard saw blade, ensuring a precise fit for your specific door width and floor conditions. On-site trimming provides better installation accuracy and reduces lead time, making it the preferred method for both residential and commercial soundproof door installations.

Independent sound tests and extensive installation experience confirm that the PDS Threshold acoustic door seal performs as well as any premium acoustic threshold on the market. The soft foam insert compresses easily, allowing the door to close smoothly without extra force while maintaining a tight, consistent seal. This design ensures exceptional sound isolation and long-term durability.

The PDS Threshold has been successfully tested in soundproof door assemblies rated up to STC 65, proving its effectiveness in high-performance acoustic applications such as studios, offices, theaters, and multi-unit buildings. Additionally, the PDS Threshold is ADA compliant, making it fully suitable for commercial installations that require both accessibility and superior noise control.

• PDS Threshold Product Specs