Pemko 256x6 Fire-Rated Saddle ...
IN STOCK (leaves warehouse same day if ordered before 3pm ET)
$269.31
$261.17
Pemko 256x6 Saddle Thresholdvwith ThermoSeal Insert PMK-256x6

Pemko 256x6 Fire-Rated Saddle Threshold with ThermoSeal Insert 128" Width UL10C Certified

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Model: 256x6D 36
$269.31
$261.17
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In Stock (leaves warehouse same day if ordered before 3pm ET)

$269.31
$261.17
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Pemko Fire-Rated Saddle Threshold with ThermoSeal Insert 128"; Width UL10C Certified

Professional Fire-Rated Threshold Solution

The Pemko 256x6 Saddle Threshold delivers professional-grade door sealing performance with integrated ThermoSeal insert technology for commercial applications. This aluminum threshold features 128"; width and 1/2"; height profile with UL10C positive pressure fire rating and cUL Listed 4L10 certification. BHMA certified construction ensures reliable barrier-free compliance for demanding commercial openings.

Professional Features & Benefits

  • Generous Width Coverage: 128"; width accommodates wide commercial openings with single-piece installation convenience for seamless door sealing.
  • Low-Profile Design: 1/2"; height profile provides effective sealing while maintaining barrier-free accessibility compliance in commercial environments.
  • Fire-Rated Performance: UL10C positive pressure fire rating with cUL Listed 4L10 certification provides essential fire barrier protection for commercial openings.
  • BHMA Certified Quality: BHMA certification ensures professional-grade performance standards for commercial door hardware applications.
  • Aluminum Construction: Durable aluminum substrate delivers long-term performance and corrosion resistance in high-traffic environments.
  • ThermoSeal Insert Technology: Integrated sealing insert provides enhanced thermal performance and weather protection for energy efficiency.
  • Manufacturer Warranty: 5 Year warranty coverage provides added confidence and protection for commercial installations.

Technical Specifications

  • ANSI/BHMA: BHMA Certified, Fire Rated UL10C Positive Pressure, cUL Listed 4L10
  • Commercial/Residential: Commercial
  • Department: Door Hardware
  • Product Category: Door Trim and Accessories
  • Product Dimension: W: 128", H: 1/2";
  • Product Group: Door Trim and Accessories
  • Product Model: 256x6
  • Product Subgroup: Door Thresholds
  • Product Substrate: Aluminum
  • Product Type: Thresholds - Saddle
  • Subcategory: Thresholds
  • Warranty: 5 Year

Professional Applications

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

Why Choose Pemko Quality?

Pemko saddle thresholds deliver professional-grade reliability with aluminum construction and BHMA certification for demanding commercial applications. UL10C positive pressure fire rating and cUL Listed 4L10 certification ensure comprehensive code compliance with 5 Year warranty coverage. Engineered for demanding commercial applications where dependable fire barrier performance and barrier-free accessibility are essential.

Product Specs

Subcategory:
Thresholds
Warranty:
5 Year
ANSI/BHMA:
BHMA Certified, Fire Rated UL10C Positive Pressure, cUL Listed 4L10
Product Group:
Door Trim and Accessories
Product Subgroup:
Door Thresholds
Product Type:
Thresholds - Saddle
Commercial/Residential:
Commercial
Product Model:
256x6
Product Dimension:
W: 128", H: 1/2"
Product Category:
Door Trim and Accessories
Product Substrate:
Aluminum
Department:
Door Hardware

Pemko 256x6D 36 – Frequently Asked Questions

1) Will the Pemko 256x6 saddle threshold work under a fire-rated door assembly?
Yes. The 256x6 is fire rated to UL10C positive pressure and cUL Listed 4L10, and it is BHMA certified. That is the combination an inspector looks for on a rated opening in the US and in Canada, so it can go under a labeled door without breaking the assembly's listing.
2) What lengths does the Pemko 256x6 threshold come in, and can I get one long enough for a double door?
Three cut lengths are stocked: 36, 48 and 72 inches. A 36 inch piece covers a standard single 3-0 opening; for a pair of doors go to the 72 inch, which spans a 6-0 pair in one piece so there is no seam at the meeting stile to leak air or trip a cart.
3) Is a 1/2 inch high saddle threshold ADA compliant for a barrier-free opening?
The 256x6 has a 1/2 inch height profile. ADA allows a change in level at a doorway up to 1/2 inch when the portion above 1/4 inch is beveled, which is why this saddle profile is used on barrier-free commercial openings. Measure from the finished floor on both sides; if your floor covering raises one side, the effective rise is what governs, not the threshold height alone.
4) What is the difference between the standard Pemko 256x6 and the Frost Guard model?
Both share the same aluminum saddle profile and the ThermoSeal insert. The Frost Guard version adds a thermal break in the threshold body, which is what you want on an exterior opening in a cold climate where a solid aluminum saddle conducts cold through to the interior side and sweats or ices at the sill. For an interior or vestibule opening the standard model is the one to order. Frost Guard is available on all three lengths, 36, 48 and 72 inch, in either finish.
5) Is there a lower-profile saddle threshold than the Pemko 256x6 for an accessible route?
Yes. The NGP 1013 is a saddle threshold at 1/4 inch by 10 inches in mill aluminum with BHMA certification, so it sits at half the height of the Pemko 256x6, which runs a 1/2 inch height profile. The trade is width at the sill: the 1013 is a 10 inch wide saddle, a much broader plate across the opening. Use the 1013 where the finished floor transition needs the shallower rise and the sill can take the width.
6) The floor levels are different on each side of the door - what should I use instead of a saddle threshold?
A saddle will not resolve a change in floor elevation. The NGP 653 is an offset threshold, 1/2 inch by 5-1/2 inches in aluminum alloy, and the offset profile is what steps between two floor heights. The Pemko 256x6 is a saddle profile at 1/2 inch height, which assumes a level sill on both sides. Same 1/2 inch height, different geometry - pick the offset when the substrate changes elevation under the door.
7) What finishes does the Pemko 256x6 saddle threshold come in?
Two: mill finish aluminum and dark bronze anodized aluminum. Mill is the raw silver aluminum most contractors use where the threshold sits under a door and is not a visual element. Dark bronze anodized is the one to order to match dark bronze storefront, hollow metal frames or door bottoms already on the building. Both finishes are offered in all three lengths and in both the standard and Frost Guard models.
8) Can I cut a Pemko 256 threshold down to fit my opening?
Yes. It is an extruded aluminum saddle, so it cuts to length on site with a miter saw and a non-ferrous blade. Standard practice is to buy the next length up and cut down: take the 48 inch for anything between 36 and 48, and the 72 inch for a pair. Cut only the ends, drill fresh anchor holes, and keep the ThermoSeal insert trimmed flush with the cut so the seal still bears on the door bottom.
9) What does the ThermoSeal insert on the Pemko 256 threshold actually do, and do I still need a door bottom?
The ThermoSeal insert is a compressible seal set into the top of the aluminum saddle. The door bottom closes onto it, so the insert makes the seal rather than a bare metal-to-metal contact, which cuts air and water infiltration at the sill and helps the thermal performance of the opening. It seals against whatever the bottom of the door presents. If your door has no sweep or bottom seal, the insert still gives you a compressible contact surface, but a full weatherseal package on an exterior opening usually pairs a threshold like this with a door sweep or automatic door bottom.
10) How does the Pemko 256 compare to the NGP 653 offset threshold, and which one do I want?
They solve different sill conditions. The 256 is a saddle: a symmetrical profile that sits on top of the floor and runs under the door, at 1/2 inch high. The NGP 653 is an offset threshold, 1/2 inch by 5-1/2 inch, with a stepped profile designed for openings where the interior and exterior floor levels differ or where you need a wider bearing surface out to an exterior slab. If your floor is flat through the opening, the saddle is the simpler install. If you have a step or a sill pan to cover, look at the offset.
11) What other fire-rated saddle thresholds can I use if the Pemko 256 is not the right profile?
Two alternates in the same family. The Cal-Royal CR3700 Series saddle threshold carries a 3-hour positive pressure fire rating, which is the one to look at when the door schedule calls out a 3-hour opening specifically. The Cal-Royal CR2000 Series is a fire rated saddle with an ADA compliant profile. Both are saddle thresholds like the 256, so they install the same way across the opening.
12) I need a wider bearing surface than the Pemko 256 saddle gives me. What else is there?
The NGP 1013 is a mill aluminum saddle threshold with a 1/4 inch by 10 inch profile and BHMA certification. Ten inches wide gives you far more coverage across the sill, which matters when you are spanning a wide floor joint, covering an old threshold cutout, or bridging two different floor finishes. It is the low-rise option too at 1/4 inch, against the 256's 1/2 inch. What it does not carry in our record is the UL10C positive pressure rating the 256 has, so on a labeled fire door stay with the Pemko.
13) What is the difference between the Pemko 256x6 and the Cal-Royal CR2000 and CR3700 saddle thresholds?
All three are saddle thresholds for commercial openings. The Cal-Royal CR2000 is a saddle series with fire-rated and ADA compliant design; the CR3700 is a saddle series carrying a 3-hour positive pressure fire rating. The Pemko 256x6 is aluminum, BHMA certified, UL10C positive pressure and cUL Listed 4L10, with a 1/2 inch height and an integrated ThermoSeal insert for the seal at the door bottom. If the ThermoSeal insert is part of what you are matching, the Cal-Royal series are different parts, not variations of the same one.
14) Can I drop in the NGP 653 as a direct replacement for a Pemko 256x6?
Not as a like-for-like swap. The NGP 653 is an offset threshold, not a saddle, so it seats differently at the sill even though both are aluminum and both carry a 1/2 inch height. The Pemko 256x6 is a saddle threshold with an integrated ThermoSeal insert, rated UL10C positive pressure and cUL Listed 4L10. If you are replacing a 256x6 in a fire-rated opening, stay on a saddle profile with a matching listing rather than moving to the offset.
15) Does the NGP 1013 give me the same seal at the door bottom as the Pemko 256x6?
No. The NGP 1013 is a plain saddle threshold, 1/4 inch by 10 inches in mill aluminum with BHMA certification. The Pemko 256x6 carries an integrated ThermoSeal insert, which is the element doing the thermal and weather sealing against the door bottom, and it is rated UL10C positive pressure with cUL Listed 4L10. If you are substituting the 1013 on an exterior opening, plan on a separate door bottom or sweep to get the seal back.
16) Is the Pemko 256 threshold rated for commercial traffic, or is it a residential part?
Commercial. It is an aluminum extrusion specified for office buildings, schools, hospitals, retail, warehouses, multi-tenant residential and government facilities. Aluminum holds up to cart and foot traffic and does not corrode at a wet sill the way a ferrous part would. For a property manager standardizing across a building, the same 256 profile in the same finish can be repeated at every exterior opening.
How fast can I get the Pemko 256x6D 36 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 256x6D 36 come with a warranty?
Absolutely. The Pemko 256x6D 36 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 256x6D 36?
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 256x6D 36 from ZenSupply?
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