Pemko 355 T Overlapping Astrag...
IN STOCK (leaves warehouse same day if ordered before 3pm ET)
$180.42
$62.25
Pemko Pemko 355 T Overlapping Astragal with Silicone Insert PMK-355

Pemko 355 T Overlapping Astragal with Silicone Insert - Fire Rated UL10C

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Model: 355CS84
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In Stock (leaves warehouse same day if ordered before 3pm ET)

$180.42
$62.25
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Pemko 355 T Overlapping Astragal with Silicone Insert - Fire Rated UL10C

Professional Fire-Rated Door Sealing Solution

The Pemko 355 T Overlapping Astragal with Silicone Insert provides essential fire-rated sealing for pairs of fire doors with UL10C positive pressure certification. This aluminum astragal measures 1-3/4"; wide by 1/8"; high and maintains NFPA 80 compliance requirements for fire door installations. Air infiltration tested and UL 4L10 listed, this professional-grade astragal delivers reliable performance in commercial fire door applications.

Professional Features & Benefits

  • Fire-Rated Performance: UL10C positive pressure certification and UL 4L10 listing ensure compliance with fire safety requirements for commercial applications.
  • NFPA 80 Compliance: Specifically designed to maintain NFPA 80 requirements when installing pairs of fire doors for code-compliant installations.
  • Air Infiltration Control: Tested for air infiltration resistance to provide effective environmental sealing and energy efficiency.
  • Precision Dimensions: 1-3/4"; width by 1/8"; height profile provides optimal sealing contact for overlapping door configurations.
  • Durable Aluminum Construction: Aluminum substrate offers long-term durability and corrosion resistance in commercial environments.
  • Silicone Insert Design: Integrated silicone insert provides flexible sealing contact that maintains effectiveness over time.
  • Manufacturer Warranty: 5 Year warranty coverage for added confidence and protection in commercial installations.

Professional Applications

  • Commercial Office Buildings
  • Educational Facilities
  • Healthcare Institutions
  • Government and Municipal Buildings
  • Industrial and Warehouse Facilities
  • Multi-Tenant Residential Properties
  • Fire-Rated Door Assemblies

Why Choose Pemko Quality?

Pemko astragal products deliver professional-grade reliability with aluminum construction and UL10C fire rating certification for demanding commercial applications. With 5 Year warranty coverage and comprehensive UL testing including air infiltration and positive pressure performance, this astragal provides the dependable fire safety performance required in code-compliant installations. Engineered for demanding commercial applications where fire protection and environmental sealing are essential.

Product Documentation & Resources

Manufacturer Resources

Product Specs

Features:
When Installing Pairs of Fire Doors Care Must be Taken to Maintain the Requirements of NFPA 80
Warranty:
5 Year
Product Group:
Door Trim and Accessories
Product Subgroup:
Astragals, Gaskets and Weatherstripping
Product Type:
Astragals
Subcategory:
Astragals
Commercial/Residential:
Commercial
UL Listing Type:
Air Infiltration Tested, Fire Rated- UL10C- Positive Pressure, Underwriters Laboratory 4L10
Product Model:
355
Product Dimension:
W: 1-3/4", H: 1/8"
Product Category:
Door Trim and Accessories
Product Substrate:
Aluminum
Department:
Door Hardware

Pemko 355CS84 – Frequently Asked Questions

1) What is the Pemko 355-T overlapping astragal used for?
The 355-T provides a weatherseal between double doors where one door overlaps the other. The silicone insert compresses against the inactive door leaf to block air, water, and light infiltration at the meeting stiles.
2) Which door gets the overlapping astragal?
Install the 355-T on the active door leaf that closes last. This door overlaps the inactive leaf, and the astragal's silicone insert seals against the face of the stationary door.
3) What door thicknesses work with this astragal?
The 355-T accommodates standard commercial door thicknesses. Verify your specific door thickness against the manufacturer's specifications. Most commercial hollow metal and wood doors are compatible.
4) What finishes are available for the Pemko 355-T?
Standard finishes include mill aluminum, dark bronze anodized, and black anodized. Custom painted finishes may be available for large orders. Match your door hardware finish for consistent appearance.
5) How does the silicone insert perform in weather exposure?
Silicone maintains flexibility in temperature extremes from -40°F to 400°F. It resists UV degradation, ozone, and moisture. The insert provides consistent sealing performance for exterior door applications.
6) Will this astragal meet building code requirements?
The 355-T helps meet air infiltration requirements when properly installed. Verify with your local code official that the astragal design is acceptable for your specific project and occupancy type.
7) What hardware comes with the astragal?
Standard packaging includes the aluminum extrusion with silicone insert and mounting screws. Check the specific length ordered to confirm included hardware. Some installations may require different fastener lengths.
8) How do you install the Pemko 355-T astragal?
Mount to the stile edge of the active door leaf using provided screws. Position so the silicone insert contacts the inactive door face when closed. Follow manufacturer's template for proper placement and fastener locations.
9) Can you adjust the seal compression after installation?
The seal compression is fixed by the astragal design and door gap. Proper initial positioning is critical. If adjustment is needed, relocate the entire astragal rather than trying to modify the silicone insert.
10) What other Pemko astragal options are available?
Pemko offers T-astragals, overlapping styles, and magnetic versions. Browse our Pemko products or weatherstripping section for alternate sealing solutions.
11) How long do silicone astragal inserts typically last?
Quality silicone inserts provide 15-20 years of service in most applications. Frequent door cycling and extreme weather exposure may reduce lifespan. Inspect annually for compression set or damage.
12) What door gap range does the 355-T accommodate?
The silicone insert design accommodates typical door gap variations. Consult the manufacturer's specifications for your exact gap requirements. Oversized gaps may require different astragal profiles or additional sealing methods.
How fast can I get the Pemko 355CS84 delivered?
Most orders ship the same day from our distribution partners, with quick delivery throughout the continental U.S. Need it urgently? Contact Us for expedited shipping options.
Can I return it if it doesn’t work for me?
Yes—ZenSupply offers a hassle-free return policy. If the product isn’t the right fit, reach out to our support team for a return authorization or setup a return by following our return instructions.
Does the Pemko 355CS84 come with a warranty?
Absolutely. The Pemko 355CS84 is backed by a manufacturer’s warranty. For full warranty terms, check the product documentation or Contact Us.
How do I get technical support or installation help for the Pemko 355CS84?
You can call, text, or email our expert support team for fast answers. We’re here to help with product selection, installation tips, and troubleshooting. Contact Us
Why buy the Pemko 355CS84 from ZenSupply?
ZenSupply makes it easy to get the commercial door hardware you need—fast shipping, expert support, and rewards on every order. Our team is always ready to help you choose the right product for your project.

Product Reviews

  • 4
    Sealed the Deal on Drafts!

    Posted by Timothy on Sep 25th 2023

    I added the Pemko 355-T Overlapping Astragal with Silicone Insert from your site. The silicone seal works wonders, keeping drafts out. However, it's a bit tough to trim for a precise fit. Overall, a great solution for weatherproofing.

  • 5
    Effective Seal, Yet Measure Door Clearance

    Posted by Brad on Dec 27th 2023

    The Pemko 355-T Overlapping Astragal with Silicone Insert effectively seals the gap between double doors, reducing drafts. However, ensure proper door clearance; the astragal's thickness might require adjustments to ensure seamless closure without any obstruction.

  • 5
    Pemko 355-T

    Posted by Dennis on Nov 6th 2023

    The Pemko 355-T Overlapping Astragal with Silicone Insert is a real door-saver. The silicone insert works wonders to seal gaps and keep drafts out, making my home cozier. Just a heads up, installation can be a bit tricky for DIY folks like me, but it's worth it for the improved insulation.

  • 5
    Improved Weather Protection

    Posted by Emma on Sep 11th 2023

    The Pemko 355-T Overlapping Astragal with Silicone Insert adds solid protection against drafts and moisture. The silicone seal is a win for keeping my home cozy. Just be ready for some DIY work during installation. Overall, a worthwhile upgrade for weatherproofing.

  • 5
    Seal the Gaps, Keep the Peace!

    Posted by Xavier on Aug 24th 2023

    The Pemko 355-T Overlapping Astragal is a fantastic gap filler. The silicone insert works like a charm to keep out drafts and noise. My only gripe is that the installation took a bit more time than expected. Enjoy a quieter, cozier space with this astragal!

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