A convincing shake or scallop exterior should read as a continuous textured surface—not a collection of repeated panels. Learn how Fairhaven Sound’s panel design and installer-controlled layout choices influence seams, patterns and overall curb appeal.

Gentek Shakes and Scallops Guide | Article 32 of 50

How to Minimize Visible Seams and Pattern Repetition in Shake and Scallop Siding

A successful shake or scallop exterior should feel continuous and naturally varied. Homeowners should notice the texture, shadow and architectural shape—not immediately identify where one panel ends and the next begins.

Some Seams Are Normal

Gentek Fairhaven Sound shakes and scallops are manufactured as individual polypropylene panels. Those panels must connect across a wall, so joints are part of the system. The realistic goal is not to promise that every seam will be invisible from every angle.

The goal is to install the panels so their connections blend into the overall cedar-like texture without creating distracting vertical lines or an obvious repeated pattern.

“Virtually seamless” should be understood as a design objective supported by the product—not a guarantee that joints can never be seen in direct light or during close inspection.

Three Fairhaven Sound Features Designed to Improve Continuity

Gentek identifies several features intended to produce a smoother, more natural-looking wall.

Self-Concealing Side Tabs

Gentek says the side tabs carry cedar-grain detailing that helps conceal the locations where panels join. This allows the connection area to participate in the texture instead of appearing as an unrelated smooth strip.

Extended Panel Length

Gentek describes Fairhaven Sound panels as approximately 40 percent longer than typical shake and scallop profiles. Fewer panel ends across a course can support longer visual lines and reduce the number of connection points that need to be managed.

Multiple Mold Patterns

Fairhaven Sound uses an expanded variety of shake molds to produce a more random appearance. This helps reduce the repeated-unit effect that can make manufactured siding look mechanical.

Product Features Cannot Correct Poor Layout

Concealing tabs and varied molds provide useful design tools, but the installer still controls how those tools are arranged on the wall. If panel joints repeatedly align in a noticeable vertical path, or the same texture appears in adjacent positions, the eye may detect a pattern.

Panel placement should be planned across each elevation according to Gentek’s current instructions. Cuts and remaining panel sections should also be managed carefully so convenience does not create obvious repetition in a prominent area.

This is one reason experienced layout matters. Installing each panel correctly is necessary, but the wall must also be reviewed as a complete visual composition.

Avoiding the “Vertical Zipper” Effect

A vertical zipper occurs when panel-end locations line up or nearly line up through several courses, creating a seam path that becomes more noticeable than the surrounding texture.

Whether and how joints may be offset is determined by the selected Fairhaven Sound profile and its installation instructions. Installers should not invent a staggering formula or modify the panel-lock system solely to change the appearance.

Within Gentek’s permitted layout, the installer can evaluate whether panel-end locations are becoming visually concentrated. This is particularly important on:

Large walls without windows or doors
Two-story elevations with long uninterrupted courses
Prominent front-facing gables
Walls illuminated by strong side lighting
Dark-colored elevations where shadows may appear stronger

Why Side Lighting Reveals More

Morning and evening sunlight travels across the face of a wall at a low angle. This side lighting emphasizes texture, projections and shadows. A seam that is difficult to see under soft, overcast light may become more apparent for part of the day.

That does not automatically indicate defective material or installation. The wall should be evaluated against Gentek’s instructions, normal viewing distance and actual panel engagement rather than judged from one photograph taken under unusually harsh light.

Nevertheless, contractors should recognize which elevations receive strong side lighting and give their layout particular attention.

Proper Panel Engagement Supports a Uniform Surface

Gentek says Fairhaven Sound’s integrated locking system connects panels for increased strength and a more uniform finished appearance. Each panel must be engaged as instructed without being forced into a position that restricts movement.

PEPA/VSI general installation guidance similarly emphasizes fully engaging siding locks while avoiding excessively tight positioning and fastening. Because Fairhaven Sound is a specialized polypropylene product, Gentek’s profile-specific requirements govern if they differ from general vinyl-siding guidance.

A panel that is incompletely connected may sit differently from its neighbors. A panel that is forced too tightly may be unable to respond normally to temperature changes. Either condition can weaken the visual continuity of the wall.

Wall Flatness Affects Seam Visibility

Even a carefully arranged joint can become conspicuous when the wall behind it is uneven. A projection may push one panel forward while a low area allows the next panel to sit farther back, producing a shadow at their connection.

PEPA installation guidance calls for a smooth, flat siding surface. That preparation includes correcting unsuitable existing materials and confirming that the wall provides an appropriate fastening base.

Seam appearance should therefore be evaluated as part of the complete installation—not only as a characteristic of the panel edge.

Temperature Positioning Matters at Every Joint

Polypropylene panels respond to temperature changes. Gentek includes a temperature chart on the Fairhaven Sound side tab and self-aligning nail slots to help the installer position panels for potential expansion and contraction.

Ignoring the required positioning may cause joint relationships to change as the wall warms or cools. The correct spacing should be determined from Gentek’s instructions and the conditions during installation—not from a generic gap copied from another siding product.

A seam should not be pulled unnaturally tight merely to make it disappear on installation day.

Shake and Scallop Patterns Need Different Visual Reviews

Profile Type	Primary Visual Strength	Layout Concern
Traditional shake	Hand-cut character and pronounced cedar texture	Avoid concentrated panel joints and conspicuous repeated shapes
RoughSawn shake	Rustic surface variation and deeper visual activity	Keep the wall natural-looking without allowing texture to hide poor alignment
Straight-edge profile	Cleaner lower edges and orderly horizontal lines	Course irregularities and joint shadows may be easier to recognize
Scallop	Graceful, repeating curves	Preserve the curved rhythm and avoid conspicuous breaks in the pattern

Corners and Openings Can Help Break Up a Large Wall

Windows, doors, corners and material transitions naturally divide an elevation into smaller visual fields. Thoughtful panel planning can use those breaks to keep cut locations and connections away from the most exposed portions of the wall, where permitted by the manufacturer’s instructions.

Decorative trim can also frame each section, but it should not be added solely to conceal a poor siding layout. Unnecessary bands may make the exterior busier and create additional flashing and termination details.

The cleanest design usually uses the home’s existing architecture rather than inventing extra divisions without purpose.

Material Handling Can Affect the Finished Appearance

Panels should be stored, handled and cut according to Gentek’s instructions. Damaged locks, distorted edges or careless field cuts may interfere with proper engagement and make connections more apparent.

Before installation, cartons and labels should be reviewed to confirm that the correct profile and color were delivered. Product availability and color offerings can change, so the current Gentek directory and order confirmation should be used.

If a panel is visibly damaged, forcing it into the wall is rarely a good aesthetic or technical solution. The installer should follow the manufacturer’s procedure for evaluating or replacing it.

Questions to Ask During the First Few Courses

Are the panel connections fully engaged? Confirm that they follow Gentek’s locking and positioning instructions.
Are joint locations forming a visible vertical path? Review the wall from a normal viewing distance before too many courses are installed.
Does the texture appear naturally varied? Look for adjacent or repeated shapes that attract unnecessary attention.
Is the wall surface flat? Shadows at joints may originate from the substrate rather than the panel design.
Has installation temperature been considered? Fairhaven Sound’s temperature-positioning features should be used as Gentek directs.
How will cuts be handled at openings? Window and door locations should not produce very narrow, fragile or awkward-looking pieces.

How to Review a Completed Wall Fairly

Begin at a normal street or yard viewing distance. Look at the full elevation rather than searching immediately for individual joints. Then move closer to review corners, openings and panel engagement.

Review the wall under more than one lighting condition. A single low-angle photograph may exaggerate shadows, while flat midday light may hide them. Neither view alone tells the whole story.

If a repeated seam or pattern remains distracting, document its location and ask the contractor to compare the work with Gentek’s current installation instructions. Do not attempt to unlock, reposition or refasten panels without qualified assistance.

Does a More Seamless Appearance Support Resale?

No panel layout can guarantee a particular resale value. However, a continuous-looking exterior tends to photograph more cleanly and allows buyers to appreciate the home’s architecture rather than focus on installation lines.

Keep the product literature, color information, installation photographs and remaining labeled material with the home’s records. Those details can be useful if a localized repair is needed later.

Review Full-Size Samples Before Ordering

Suburban Wholesale & Supply can help contractors and homeowners compare Gentek Fairhaven Sound profiles, textures and colors. A larger physical sample provides a better understanding of pattern scale and shadow than a small digital image.

Visit Suburban Wholesale & Supply at 3602 North Harrison Street in Davenport, Iowa, to discuss shake and scallop options for a Quad Cities exterior. Installation must follow current Gentek documentation, applicable building codes and project-specific requirements.

How to Minimize Shake Siding Seams and Repetition