Cal-Royal INT-440 Adhesive Wea...
IN STOCK (leaves warehouse same day if ordered before 3pm ET)
$84.74
Cal-Royal Cal-Royal INT-440 Adhesive Weatherstrips with Intumescent CAL-INT-440

Cal-Royal INT-440 Adhesive Weatherstrips with Intumescent Seal for Wood or Hollow Metal Frames

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Model: INT-440B-3684
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In Stock (leaves warehouse same day if ordered before 3pm ET)

$84.74
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Cal-Royal INT-440 Adhesive Weatherstrips with Intumescent Seal for Wood or Hollow Metal Frames

Cal-Royal INT-440 Adhesive Weatherstrips with Intumescent are engineered and tested for durability and reliable performance, delivering an energy-efficient door sealing solution that restricts air, light, smoke, and insects from around the opening. The seal begins compressing at 1/4" and compresses to seal gaps up to 1/8", making it ideal for both wood and hollow metal frames. Constructed from Silicone Rubber with 3M Adhesive Tape, this weatherstrip is rated for high-temperature performance, operating effectively between -58°F and 450°F.

Key Features

  • Compression Specification: Seal begins compressing at 1/4" and compresses to seal gaps up to 1/8", ensuring a tight, reliable barrier around the door frame.
  • Temperature Range: Effective between -58°F and 450°F, allowing consistent performance across a wide range of climates and applications.
  • Premium Construction: Made from Silicone Rubber with 3M Adhesive Tape for strong initial adhesion and long-term holding power.
  • High-Quality Self Adhesive: Simple, cost-effective installation that creates a dependable seal around the door frame without complex hardware.
  • Non-Toxic and Self-Extinguishing: Resistant to sunlight, ozone, oxidation, weather, water, and flames for long-lasting protection.
  • Mold and Mildew Resistant: Impermeable to mildew and fungus, and will not degenerate under normal exposure conditions.
  • Frame Compatibility: Suitable for use on both Wood and Hollow Metal Frames, offering flexible installation options.

Technical Specifications

  • Product Group: Door Trim and Accessories
  • Product Subgroup: Astragals, Gaskets and Weatherstripping
  • Product Type: Weatherstripping
  • Subcategory: Gaskets & Weatherstripping
  • Commercial/Residential: Commercial
  • Product Category: Door Trim and Accessories
  • Department: Door Hardware

Typical Applications

  • Commercial Office Buildings
  • Educational Facilities
  • Healthcare Institutions
  • Retail Establishments
  • Industrial and Warehouse Facilities
  • Multi-Tenant Residential Properties
  • Government and Municipal Buildings

Why Cal-Royal INT-440?

Cal-Royal INT-440 weatherstrips deliver dependable, energy-efficient sealing performance backed by durable Silicone Rubber construction and high-strength 3M Adhesive Tape. Engineered to resist sunlight, ozone, oxidation, water, and flames while remaining non-toxic and self-extinguishing, this weatherstrip is built for demanding commercial door applications where consistent performance under varied conditions is essential.

Product Specs

Product Group:
Door Trim and Accessories
Product Subgroup:
Astragals, Gaskets and Weatherstripping
Product Type:
Weatherstripping
Subcategory:
Gaskets & Weatherstripping
Commercial/Residential:
Commercial
Product Category:
Door Trim and Accessories
Department:
Door Hardware

Cal-Royal INT-440B-3684 – Frequently Asked Questions

1) What gap size will the Cal-Royal INT-440 weatherstrip actually seal on a door?
The INT-440 silicone seal starts compressing at 1/4 inch and compresses down to close gaps up to 1/8 inch. So if your door-to-frame gap sits in that 1/8 to 1/4 inch band, it will make contact and seal. A gap wider than 1/4 inch won't get compression from this strip, and you'd want a kerf-in or adjustable jamb seal with a deeper insert instead.
2) Can I use this weatherstrip on a hollow metal frame, or is it only for wood?
Both. The INT-440 is a press-on adhesive strip made for wood and hollow metal frames. Because it mounts with 3M adhesive tape rather than screws or a kerf groove, there's no frame prep, no routing, and no fasteners. That also means the frame face has to be clean, dry, and smooth for the tape to hold.
3) What sizes does the Cal-Royal INT-440 come in and how do I pick one for my opening?
Three size sets are offered: 36 x 84 inch, 48 x 96 inch, and 96 x 96 inch. The pairs cover the two jambs and the head of a single opening, so match them to the door leaf and frame height you are sealing. A standard 3-0 x 7-0 commercial opening takes the 36 x 84. Taller or double-leaf openings take the 48 x 96 or 96 x 96 set.
4) What is the closest alternative to the Cal-Royal INT-440 if the frame is already kerfed?
The INT-440 is a self-adhesive silicone rubber seal with 3M adhesive tape, applied to the face of a wood or hollow metal frame with no machining. If the frame already carries a kerf, the Pemko Q103W is a kerf-in foam weatherstrip with an extended flange, 1-1/4" x 3/16", that pushes into the kerf instead of sticking to the stop face. Same sealing job, different frame prep.
5) I need a metal-housed jamb seal instead of an adhesive strip - what should I use?
The INT-440 is an adhesive-mounted silicone strip with no carrier extrusion, so it relies entirely on the 3M tape bond to the frame. Where a fastened metal housing is preferred, the Hager 864S is an 84" clear anodized aluminum adjustable jamb weatherstrip with a neoprene insert, and the Hager 862S is a 48" weatherstrip with a neoprene insert for smoke and draft control. Those give you a rigid carrier and a replaceable insert rather than a tape-applied seal.
6) Is a neoprene weatherstrip the same thing as the Cal-Royal INT-440?
No. Neoprene-insert strips such as the Hager 862S, Hager 864S and Pemko 68 seal against air and smoke with a compressible rubber insert. The INT-440 is silicone rubber and carries an intumescent seal, and it is rated for service from -58 degrees F to 450 degrees F while being non-toxic and self-extinguishing. If the spec calls out intumescent, a neoprene insert strip is not an equal swap.
7) What does the intumescent part of the INT-440 do that a plain rubber weatherstrip doesn't?
Plain silicone or neoprene gasketing blocks air, light, and smoke at normal temperatures only. The INT-440 pairs the silicone seal with an intumescent element, and the material is non-toxic and self-extinguishing, rated for service from -58 F up to 450 F. That temperature range is why it's specified on openings where a standard adhesive foam strip would fail.
8) Will this weatherstrip hold up in an unconditioned warehouse or an exterior door in a cold climate?
Service range runs -58 F to 450 F, so extreme heat and deep cold are both inside spec. The silicone rubber also resists sunlight, ozone, oxidation, weather, and water, and it's impermeable to mildew and fungus. That covers loading dock doors, warehouse openings, and exterior entries in hard climates.
9) My frame is already kerfed - should I use an adhesive strip like the INT-440 or a kerf-in seal?
If the jamb already has a kerf groove, a kerf-in seal is the better fit, since it seats in the slot and can be pulled and replaced without scraping adhesive. The Pemko Q103W Series is a kerf-in foam weatherstrip with an extended flange at 1-1/4 by 3/16 inch. The INT-440 is the choice for frames with no kerf, where you are sealing to a flat jamb face with tape.
10) What else does ZenSupply carry if I need a smoke seal instead of an intumescent adhesive strip?
For smoke and draft control there are a few other routes. The Hager 726S is a press-on smoke seal weatherstrip in charcoal, which installs much like the INT-440. The Hager 862S is a 48 inch weatherstrip with a neoprene insert for smoke and draft control, and the Hager 864S is an 84 inch clear anodized aluminum adjustable jamb strip with a neoprene insert, useful when you want to dial the seal in after hanging the door. For the head of the door, the Pemko 68 is a 40 inch door top weatherstrip with a black sponge neoprene insert.
11) Do I need any screws or mounting hardware to install the INT-440?
No fasteners. The strip ships with 3M adhesive tape already on it, so installation is clean the jamb, peel, and press. There's no drilling, no kerf routing, and no aluminum carrier to cut and fasten. If you want a mechanically fastened jamb seal instead, an aluminum-carrier strip such as the Hager 864S is the alternative approach.
12) Cal-Royal INT-440 versus Hager 726S for a smoke-rated opening - what is the difference?
Both are press-on style seals that go onto the frame without machining. The INT-440 is silicone rubber with 3M adhesive tape carrying an intumescent seal, rated from -58 degrees F to 450 degrees F, and it begins compressing at 1/4" to close gaps up to 1/8". The Hager 726S is a smoke seal weatherstrip with press-on installation in a charcoal finish. If you want a black or white finish to match the frame, the INT-440 comes in both.
13) Black or white weatherstrip - does the color choice affect anything besides looks?
Only appearance. Both the black and white INT-440 are the same silicone rubber strip with the same 3M tape and the same compression range. Pick black against dark bronze or painted dark frames, white against painted white wood jambs or aluminum. For a fleet of openings, order one color and stay with it so the doors match.
14) Is the Cal-Royal INT-440 suitable for apartment corridor doors and school classroom doors, or is it a residential product?
It's a commercial-duty product. Typical applications include office buildings, schools, healthcare, retail, industrial and warehouse space, multi-tenant residential, and government buildings. For a property manager standardizing corridor or unit entry doors, the adhesive mounting makes it something maintenance staff can apply without pulling the frame or drilling.
How fast can I get the Cal-Royal INT-440B-3684 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 Cal-Royal INT-440B-3684 come with a warranty?
Absolutely. The Cal-Royal INT-440B-3684 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 Cal-Royal INT-440B-3684?
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 Cal-Royal INT-440B-3684 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.
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