Compare Gentek patio door stucco-fin, nail-fin and brickmould frame options. Learn how wall construction, siding, flashing, opening dimensions and installation sequence determine the right configuration.

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Gentek Patio Door Frame Options: Nail Fin, Stucco Fin and Brickmould

Selecting the patio door style, glass and color is only part of a complete order. The frame option determines how the door relates to the wall, exterior cladding, flashing and visible trim. Ordering the wrong frame can create measurement conflicts, unnecessary field modification and serious water-management problems.

Gentek currently lists stucco fin, nail fin, 1⅜-inch brickmould and 2-inch brickmould frame options for the Sanctuary Sliding Patio Door Collection. The right choice depends on the actual wall assembly and installation plan—not simply whether the project is casually described as “new construction” or “replacement.”

Gentek Sanctuary Frame Options

Frame option	General purpose	Critical verification
Nail fin	Provides a perimeter flange used to position and attach the door while integrating it with the wall’s water-management system.	Confirm fin setback, wall depth, sheathing plane, flashing sequence and cladding relationship.
Stucco fin	Designed for selected stucco installation or replacement conditions.	Determine whether it is a mounting flange, flush fin, renovation fin or another manufacturer-defined detail.
1⅜-inch brickmould	Provides an integrated exterior trim profile of the published width.	Verify outside dimensions, cladding return, J-channel or trim relationship and required sealant joints.
2-inch brickmould	Provides a wider exterior trim profile that may cover more of the perimeter condition.	Confirm that the greater width will not conflict with siding, masonry, shutters, decks or adjoining trim.

What a Nail Fin Does

A nail fin is a flange extending around applicable portions of the patio door frame. It can help position and attach the unit while providing a surface that can be integrated with flashing and the water-resistive barrier.

The fin should not be treated as the door’s complete waterproofing system. Water management depends on the sill condition, pan or sill-flashing detail, jamb and head flashing, water-resistive barrier, cladding, sealants, drainage paths and sequencing.

Fastening through a fin also does not eliminate the need to support, shim and fasten the frame as required by Gentek. Patio doors are large and heavy. The sill must provide continuous, level support appropriate for the product and opening.

Nail-fin applications may include:

New construction before exterior cladding is installed.
Full-frame replacement where siding and exterior trim are removed.
Remodeling in which the weather-resistive barrier can be accessed and integrated properly.
Openings where the specified fin setback aligns with the intended wall plane.

These are possible applications, not blanket instructions. The manufacturer’s approved details and project conditions control.

Understanding the Stucco-Fin Option

Stucco construction creates different perimeter conditions from conventional lap siding. The exterior finish may be thick, brittle and difficult to remove without damage. A stucco-fin configuration can be intended to address selected installations where the existing finish remains around the opening.

However, the name “stucco fin” is not enough to design the installation. Contractors must verify the actual Gentek frame drawing and determine how the fin relates to the existing frame, stucco edge, drainage plane and sealant joint.

Questions that must be answered

Is the existing patio door frame being completely removed?
Will any portion of the old frame remain?
Is the stucco fin structural, decorative or both in the approved detail?
How will the opening be flashed behind the retained stucco?
What sealant-joint width and backing are required?
Where can incidental water drain?
Will the fin cover the existing cut edge consistently?

Covering a stucco edge is not the same as integrating the patio door with the concealed drainage plane. If that integration cannot be verified, the contractor needs a project-specific water-management plan rather than more exterior sealant.

What Brickmould Adds

Brickmould is an exterior casing or trim profile surrounding the patio door. Gentek lists 1⅜-inch and 2-inch options for Sanctuary doors, giving contractors more than one visible trim width.

The wider option may provide stronger visual definition or cover a larger perimeter condition. It also increases the overall exterior dimension and may create conflicts that the narrower profile avoids.

Brickmould is not automatically a substitute for head flashing, sill flashing, a water-resistive barrier or properly directed laps. Its visible trim function must be separated from the concealed water-management details behind it.

Compare brickmould with:

Existing siding and J-channel locations.
Brick or stone openings and clearances.
Nearby window and entry-door casing widths.
Decking, steps and exterior landings.
Head flashing or drip-cap requirements.
Exterior shutters, lights and receptacles.
Trim-coil or field-applied cladding plans.
Sealant-joint access and geometry.

Choosing Between 1⅜-Inch and 2-Inch Brickmould

Decision factor	Narrower profile consideration	Wider profile consideration
Existing trim	May coordinate with restrained window casing.	May coordinate with broader traditional casing.
Perimeter coverage	Covers less of the surrounding wall condition.	May cover more, but coverage must not be mistaken for flashing.
Available space	May avoid nearby siding or masonry conflicts.	Requires more clear perimeter width.
Visual weight	Provides a cleaner or lighter outline.	Creates stronger definition around the large opening.
Outside dimension	Produces a smaller overall trim footprint.	Can conflict with fixed masonry or existing accessories if not measured.

The two-inch option is not inherently better merely because it is wider. The correct width is the one that fits the wall, supports the design and permits proper installation.

Replacement Versus New Construction Is Too Simplistic

Contractors frequently use “replacement” to mean any door installed in an existing home and “new construction” to mean any door with a fin. Those shortcuts can obscure the actual work.

A full-frame replacement in an existing home may require removal of exterior cladding and use a nail-fin installation. A new addition may have a unique masonry opening requiring a different frame treatment. The building’s age does not determine the frame option by itself.

Define the installation by what is being removed, what remains, how the water-resistive barrier will be accessed and how the new door will be flashed and supported.

Frame Choice Changes the Measurements

Contractors must distinguish among the rough opening, unit frame size, outside frame or brickmould dimensions, visible opening and finished interior dimensions. Using one measurement for all of these creates expensive ordering errors.

Record at least:

Rough-opening width at the top, center and bottom.
Rough-opening height at multiple locations.
Diagonal dimensions to assess square.
Sill level and support condition.
Wall thickness and jamb depth.
Existing exterior-frame and trim dimensions.
Distance to masonry, siding, decking and adjacent accessories.
Interior flooring height and finished-floor transitions.
Required installation clearance.
Exact Gentek frame and brickmould dimensions from current drawings.

Do not subtract an improvised allowance from a masonry opening and call that the order size. Use Gentek’s stated sizing conventions and verify whether the quoted dimensions refer to the frame, brickmould or rough opening.

The Sill Is More Important Than the Trim

The lower portion of a patio door carries significant weight and faces concentrated water exposure. A visually attractive brickmould installation cannot compensate for a poorly supported or improperly flashed sill.

Inspect for rot, deterioration, out-of-level conditions, inadequate bearing, damaged concrete, deck conflicts and interior flooring transitions before ordering.

The sill-flashing or pan approach must be compatible with the opening, door design and manufacturer’s instructions. It must not block the patio door’s intended drainage paths.

Flashing Must Follow a Drainage Strategy

Flashing materials should be installed so water is directed toward the exterior. The correct sequence depends on the water-resistive barrier, cladding, opening condition, flashing products and Gentek’s instructions.

More sealant is not automatically safer. Excessive or misplaced sealant can block drainage paths, prevent proper laps, trap water and make future service difficult.

Pay particular attention to:

Sill-pan or sill-flashing continuity.
Back-dam and end-dam requirements where applicable.
Jamb-flashing integration.
Head flashing and drainage over the opening.
Water-resistive barrier sequencing.
Fastener penetrations.
Brickmould and cladding transitions.
Unblocked frame and sill drainage.
Sealant-joint backing, width and adhesion.

Brickmould Is Not a License to Skip Exterior Preparation

Wider integrated trim may conceal an irregular cut edge, but concealing a condition does not correct it. Rotten sheathing, missing flashing, reverse laps and damaged water-resistive barriers remain defects after they are covered.

The opening should be inspected and repaired before the patio door is installed. If surrounding siding or masonry prevents that inspection, disclose the limitation and establish how concealed conditions will be handled.

A customer should understand the difference between a known fixed price and an allowance that may change after demolition exposes the wall.

Exterior Trim and Siding Coordination

The selected frame option influences how siding terminates at the door. Vinyl siding may use J-channel or another approved accessory, while brick, stone, stucco and panel cladding require their own clearances and water-management details.

Field-formed aluminum trim can provide a clean finish, but decorative capping is not a replacement for flashing. It also must not cover weeps, obstruct sealant joints or pin vinyl siding so tightly that it cannot move.

Suburban Wholesale’s Gentek aluminum coil matching guide provides related information about exterior trim coordination and water-management limitations.

Frame Options Do Not Change the Basic Performance Rules

The patio door must still be installed plumb, level and square. Its sill must be supported, its panels adjusted, its locks aligned and its drainage paths kept open.

Do not use the nail fin or brickmould to pull a distorted frame into alignment. Overdriven or poorly positioned fasteners can bow the frame and create roller, lock, air-leakage or water-management problems.

Check the frame repeatedly during fastening. A large patio door can shift as shims, anchors and fasteners are installed.

How InstallationMasters Applies

FGIA’s InstallationMasters program provides nationwide training and certification for new-construction and replacement installers of windows and exterior glass doors.

Training covers topics from initial site inspection through final cleaning and maintenance. That scope is directly relevant to frame selection because the correct option depends on understanding the existing opening, wall system and installation sequence before the product is ordered.

InstallationMasters provides industry-accepted installation education, but it is not a substitute for Gentek’s product-specific instructions. FGIA states that manufacturer instructions should always take precedence.

What the AAMA Gold Label Verifies

The AAMA Gold Label Certification Program provides third-party verification for qualifying windows, doors and skylights. FGIA explains that a product sample undergoes independent laboratory testing and that ongoing manufacturing inspections help confirm continued compliance.

Testing can address air leakage, water penetration, structural resistance and applicable life-cycle durability requirements. Certification applies to the qualifying, properly labeled product configuration.

The Gold Label does not certify the field installation, surrounding wall, flashing sequence or contractor-selected sealant. A certified patio door can still leak or operate poorly when its frame option is wrong for the opening or its installation is defective.

Sales Tips for Contractors

Inspect before proposing

Do not select a frame option from an exterior photograph alone. Inspect the interior, exterior, sill, wall depth and existing frame.

Name the frame explicitly

List nail fin, stucco fin, 1⅜-inch brickmould or 2-inch brickmould on the quote. “Standard frame” leaves too much room for error.

Explain visible and concealed work

Homeowners see the brickmould and sealant. Explain that sill support, flashing and drainage behind the trim determine whether the installation manages water.

Price demolition uncertainty

Use a written concealed-condition allowance when rot, damaged flashing or irregular framing cannot be known before removal.

Use current drawings

Confirm frame depth, fin setback and outside dimensions from Gentek’s current documents. Do not rely on measurements from a different series.

Get help before placing the order

Suburban Wholesale’s professional quoting service can help contractors organize opening dimensions, frame options and related product selections.

Preorder Frame Checklist

Identify the existing wall system.
Determine what will be removed.
Inspect sill condition and support.
Measure the rough opening in several places.
Record wall thickness.
Select the exact Gentek frame option.
Verify outside frame and trim dimensions.
Plan sill, jamb and head flashing.
Confirm siding or masonry transitions.
Protect all drainage paths.
Review concealed-condition allowances.
Document the frame on the order.

Match the Gentek Frame to the Actual Opening

Frame selection is not a cosmetic afterthought. It determines the door’s dimensions, wall position, exterior trim relationship and installation approach. The most reliable order begins with a site inspection and current manufacturer drawings.

Suburban Wholesale & Supply helps contractors throughout Davenport, Bettendorf, Moline, Rock Island, East Moline and surrounding Quad Cities communities review Gentek Sanctuary patio doors , available frames, glass packages, hardware, colors and ordering information.

Request a Gentek Patio Door Quote

Sources

Frame designs, fin setbacks, brickmould dimensions, attachment requirements and availability may change. This article provides general educational guidance and does not replace current Gentek drawings, product-specific installation instructions, flashing-manufacturer requirements, applicable codes or project-specific professional judgment.

Gentek Patio Door Frame Options: Fin and Brickmould Guide