4 Substrate Options
12+ Machining Operations
10 Year Warranty
SIZE
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Sizes: Thicknesses: 1-1/4"
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Lengths: 6/8, 8/0, 16/0, 2/8, 3/0, 14/0
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Widths: 4 1/8", 4 9/16", 4 7/8", 5 1/4", 6 9/16", 6 7/8", 7 1/4", 9 1/4"
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Length, width, and thickness options vary by substrate.
Crafted from high-performance substrates, CTI exterior door frames resist warping, rotting, and moisture damage at the most vulnerable part of the opening, keeping doors square, sealed, and secure through years of weather exposure. Frames are available in multiple substrate options to match performance requirements and price points, including ProtecDoor™ composite, with its four-inch rot-resistant bottom; SuperComp™ PVC, for coastal and high-moisture environments; and primed finger-jointed wood. With a full range of widths and lengths and complete in-house machining, including dado cutting, pre-drilling, hinge and strike prep, and weatherstrip application, CTI frames arrive prepped and ready to hang as a core component of the Apex Door System™
Exterior Door Frames
Frames
Substrate Options
20M labeling
20-minute fire-rating labels applied.
20M stamp
20-minute fire-rating stamp applied.
Ripped to size
Ripped to your required width for a precise fit.
Continuous head machining
Uniform prep across wider or multi-unit openings.
Weatherstrip application
Weatherstrip installed at the mill.
Triple strike machined
Three-strike preps for multi-point hardware.
Double strike machined
Two-strike preps for double-door configurations.
Strike machined
Strike prep is positioned for accurate latch alignment.
Hinge machined
Hinge locations routed and prepped to spec.
Custom length
Cut to your exact length, no field cutting.
Pre-drill head and sill dado
Pre-drilled locations for faster, consistent assembly.
HEAD AND SILL DADO
Precise dado cuts for a tight frame joint.
Machining and Customization
CTI exterior frames are machined in-house and arrive prepped and ready to hang, moving customization upstream so your team spends less time on the bench and more time producing finished doors.
Available operations include:
CTI exterior frames are offered in four substrates: Pine, LVL, SuperComp™ PVC, and ProtecDoor™. Each suits a different balance of performance, environment, and price point, from workable natural wood to low-maintenance PVC and rot-resistant composite. Contact our team to determine the right fit for your program.
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ProtecDoor™ pairs a finger-jointed pine body with a four-inch composite rot-resistant bottom. That composite section sits at the base of the frame, the zone closest to the threshold where water pools and wicks upward, resisting moisture and decay while the pine body above retains the workability of natural wood.
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SuperComp™ PVC is the preferred choice for coastal, humid, and high-moisture environments. Because PVC does not absorb water, rot, or decay, it delivers low-maintenance, long-term durability where exterior wood frames are more likely to fail over time.
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Yes. Weatherstrip application is available as an in-house machining option, so frames arrive with weatherstrip already installed rather than requiring a separate step at your facility.
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CTI frames are machined in-house and arrive ready to hang. Available operations include head and sill dado, pre-drilling, hinge and strike prep (single, double, or triple strike), custom length, ripping to size, continuous head machining, weatherstrip application, and 20-minute fire-rating stamping and labeling.
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Frames are produced in a 1-1/4" thickness, in lengths of 6/8, 8/0, 16/0, 2/8, 3/0, and 14/0, and in widths from 4-1/8" up to 9-1/4". Available sizes vary by substrate, and custom lengths and widths are available.
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Frequently Asked Questions
Technical Details and Resources
Each CTI product comes with a 10 Year Manufactured Defect Warranty, ensuring they are free from material and workmanship defects under normal use for the product's lifetime. This commitment to quality offers you peace of mind and guarantees that you are investing in products built to last. You can view our product-specific warranties below.