DOOR SEAL SYSTEMS & THRESHOLDS
Complete Door Sealing Systems
for Acoustic Performance & Privacy
Engineered door seals and thresholds reduce sound transfer, improve privacy, and protect acoustic integrity, especially when combined with acoustic doors.
Seal Every Gap.
Preserve Privacy.
Regardless of door type, sound isolation is only as effective as the seal. Even small gaps at the perimeter, head, or sill can significantly compromise acoustic performance—allowing sound to bypass the door leaf entirely and reducing the effective STC of the overall assembly. This is true for both standard doors and high-performance acoustic doors; without proper sealing, the door’s rated performance cannot be realized.
Door Seal Systems and Thresholds address these vulnerabilities with engineered gasketing and automatic sealing solutions that close critical air paths. Designed for both new construction and retrofit applications, these systems provide consistent compression, long-term durability, and verifiable acoustic performance when tested in accordance with ASTM E90 and ASTM E413 standards.
Door Seal Systems and Thresholds address these vulnerabilities with engineered gasketing and automatic sealing solutions that close critical air paths. Designed for both new construction and retrofit applications, these systems provide consistent compression, long-term durability, and verifiable acoustic performance when tested in accordance with ASTM E90 and ASTM E413 standards.
Common applications:
- Education environments such as classrooms, lecture halls, and music rooms
- Hospitality and multifamily buildings seeking noise reduction between rooms
- Government and secure facilities where confidentiality is essential
- Healthcare and research facilities requiring acoustic and infection-control integrity
- Corporate offices and conference rooms where speech privacy is critical
Product Overview
DOOR SEAL SYSTEMS & THRESHOLDS
Automatic Door Bottoms
Automatic Door Bottoms use a spring-loaded mechanism that seals the threshold as the door closes, preventing drag and ensuring a consistent compression seal along uneven floors. The gasket activates from the hinge side first, closing gaps efficiently without resistance.
Performance & Design Highlights:
- Tested to 5 million cycles for durability
- Surface-mounted, semi-mortised, or fully mortised options
- “Light Spring (LS)” models available for ADA-compliant doors
- Airflow/sound-blocking “FLO” versions balance ventilation and isolation
- STC performance when paired with rated doors: Up to STC 52
- UL10C Fire-rated | ADA accessible | Tested assemblies to ASTM E90
DOOR SEAL SYSTEMS & THRESHOLDS
Perimeter Gasketing Systems
Engineered perimeter gaskets that line the head and jambs of the door frame provide compression or magnetic sealing around the entire door perimeter. Options include adjustable gaskets, ligature-resistant seals (ZAG), and double-sealing EBF profiles for maximum acoustic performance.
Performance & Design Highlights:
- Adjustable gaskets for misaligned or warped doors
- Double bulb and magnetic seals for improved STC ratings
- Ligature-resistant (ZAG) configurations for behavioral health and detention environments
- Available in aluminum, bronze, or stainless finishes
- STC performance range: 48–55, depending on door assembly
- Fire-rated and UL listed components
- Finishes:Clear anodized, dark bronze, black, gold, or oil-rubbed bronze
DOOR SEAL SYSTEMS & THRESHOLDS
Acoustic Thresholds
Acoustic thresholds form the foundation of a complete door seal system, bridging the gap between the door and floor surface. Aluminum and stainless steel thresholds incorporate resilient gaskets for sound, air, and smoke control while maintaining ADA accessibility.
Performance & Design Highlights:
- Compatible with all automatic door bottom models
- Low-profile and ramped options for barrier-free entry
- Available with neoprene, vinyl, or brush inserts for tailored performance
- Heavy-duty saddle and half-saddle profiles available
- EBF (extruded bulb/finger) options ensure tight contact on uneven flooring
- Typical STC improvement: 3–5 points per assembly
DOOR SEAL SYSTEMS & THRESHOLDS
Performance & Design Highlights
Our engineering team ensures every system is properly specified, installed, and verified for optimum results.
- Engineered Acoustic Control: Designed to maintain sound isolation performance up to STC 55 when paired with rated door assemblies
- Complete Perimeter Sealing: Systems integrate automatic door bottoms, perimeter gaskets, and thresholds to eliminate gaps along all four edges of the opening
- Advanced Automatic Mechanisms: Spring-loaded drop seals activate from the hinge side first, creating uniform contact even on uneven flooring
- Multi-Function Performance: Provides sound, smoke, draft, and light blocking in a single assembly, with optional heat-activated components for fire-rated openings
- Durable Construction: Extruded aluminum, stainless steel, and bronze housings with replaceable silicone or neoprene inserts ensure long-term reliability under high-traffic use
DOOR SEAL SYSTEMS & THRESHOLDS
Installation & Integration
Memtech provides design coordination with architects, contractors, and door manufacturers to ensure that seals, thresholds, and frames integrate seamlessly with door construction and acoustic requirements.
Our approach includes:
- Pre-Installation Prep: Verify frame alignment and door clearances to ensure proper compression along the full perimeter.
- Mounting Options: Choose from surface-mounted or concealed hardware depending on door type and application.
- Threshold Compatibility: Match threshold height and profile with automatic door bottom models for a continuous seal.
- Adjustment: Use built-in adjustment screws on perimeter gaskets to maintain uniform pressure as doors settle or flooring conditions change.
- Seamless Integration: Systems can be paired with acoustic, smoke, or fire-rated doors for complete performance assemblies.
The Memtech Advantage.
We go beyond simply supplying components. We engineer complete, door sealing solutions that ensure every opening meets its acoustic, fire, and accessibility standards.
Data-Driven Design
Our recommendations are based on vibro-acoustic data acquired at your location (or per your requirements) while not relying solely on product ‘spec sheets’
System Integration Expertise
We ensure lagging assemblies interface seamlessly without restricting access or maintenance
Long-Term Reliability
Materials are selected for durability under temperature, humidity, and vibration stress
Material Specification & Procurement
Direct access to a full range of door kits, thresholds, and mounting hardware for simplified purchasing
Local Turnkey Implementation
Clear installation documents and on-site guidance to ensure correct overlap, seam sealing, and mechanical fastening
Performance Verification
Optional field measurement and acoustic performance verification
Technical Highlights
Engineered sealing systems built for acoustic, fire, and accessibility performance.
Construction
Extruded aluminum or stainless steel housings with replaceable neoprene, silicone, or magnetic inserts.
Operation
Compression-fit or automatic drop-seal mechanisms for consistent, gap-free sealing.
Integration
Compatible with perimeter gaskets, thresholds, and full Sound Trap® acoustic door kits.
Fire Rating
Class A per ASTM E84
Compliance
Meets ASTM E90 / E413, UL10C, and ADA 404.2.5 standards.
Acoustic Performance (STC)
Achieves up to STC 53 when integrated with rated door assemblies.
Support Beyond the Product
Installation assistance available for Michigan and Great Lakes region clients
Engineering consultation to ensure proper material selection
Custom sizing and integration with other Memtech acoustic systems
Replacement parts available for future reconfiguration
Frequently Asked Questions (FAQs)
What makes Zero International door seals different?
Their patented designs ensure consistent hinge-side activation, preventing drag and maintaining uniform pressure to achieve long-term acoustic and air-sealing performance.
Are door seals compatible with existing frames?
Yes. Surface-mounted gaskets and automatic door bottoms can retrofit existing frames without major modifications.
Do these seals also block smoke and fire?
Yes. Intumescent and smoke-rated inserts are available for fire-rated openings.
What STC ratings can be achieved?
Depending on configuration, systems can achieve STC 49–53 when combined with rated acoustic doors.
Can seals be field-adjusted?
Yes. Adjustable gaskets (e.g., Model 770) can be fine-tuned with a screwdriver to restore pressure as doors settle or shift over time.
Are these products ADA compliant?
Yes. Automatic bottoms with low-force “light spring” mechanisms and ADA thresholds maintain accessibility.
Do you provide turnkey services?
Yes. We provide full-service delivery, measurement, engineering, design/build, installation, and post-installation validation. You receive a complete, proven solution from one, accountable partner.
What’s the typical lead time for material supply?
Most standard door kits are stocked and delivered within 1–2 weeks.
Let’s Engineer the Right Solution, Together.
Let's Get Started. Contact Us.
Talk to our experts. We’ll assess your needs and recommend a solution that works for your project.
