Which Alumission posts fit this steel base?

The 1-1/4″ × 1-1/4″ center tube is designed so all Alumission aluminum post profiles can sleeve over it.

What lengths are available?

Choose an 18″ center tube or a 4′ center tube. Both use the same 4″ × 4″ mounting plate and square-tube dimensions.

Where can this post base be installed?

It is mainly used for fences and railings on structurally reinforced decks. It may also be used for fences or wall toppers on suitable walls, concrete slabs, and other structurally adequate floors.

Can I use it for railing posts?

Yes, when the base, anchors, supporting structure, and complete railing system meet the project’s engineering and local code requirements.

Is the base zinc-coated or painted black?

The product is zinc-coated steel, not black-painted steel. The silver zinc finish shown in the main photo is the actual finish.

What are the base-plate dimensions?

The plate measures 4″ × 4″ × 1/8″ thick and has four 3/8″ mounting holes near the corners.

What size is the center steel tube?

The center tube measures 1-1/4″ × 1-1/4″ with a 1/8″ wall. Its height is either 18″ or 4′, depending on the selected variation.

Should I use a base cover?

Yes, it is recommended for a cleaner finished installation. Slide the base cover over the steel tube before sleeving the aluminum post onto the base.

Are mounting anchors included?

No. Select anchors that are appropriate for the deck framing, wall, concrete, or other supporting substrate.

How is the aluminum post installed?

After anchoring the base and positioning the base cover, sleeve the aluminum post over the square center tube and secure it according to the project requirements.

Can I fasten it only to deck boards?

No. For deck installations, the base must be anchored into adequate structural framing or blocking beneath the decking.

18-inch zinc-coated steel post base with 4-inch square mounting plate and four corner holes

Technical drawing of 18-inch zinc-coated steel post base with 4-inch square plate, 1-1/4-inch tube, 1/8-inch wall, and four 3/8-inch holes

Zinc-Coated Steel Post Base for Aluminum Posts

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Zinc-coated steel post base for surface-mounting Alumission aluminum fence and railing posts. Choose an 18″ or 4′ center tube. Features a 4″ × 4″ × 1/8″ plate, four 3/8″ mounting holes, and a 1-1/4″ × 1-1/4″ × 1/8″ square post sleeve.

STARTING AT $33.57

Length

18"

Clear

WHAT’S INCLUDED:

One zinc-coated steel post base in the selected height: 18″ or 4′.

Aluminum post, Aluminum Base Cover, mounting anchors, #12 self-drilling screws, and installation tools are sold separately.

Box Weight

Box Dimension

TECHNICAL SPECIFICATIONS & INSTALLATION

Zinc-Coated Steel Post Base for Aluminum Posts provides a concealed internal sleeve for mounting Alumission aluminum fence and railing posts on structurally reinforced decks, walls, concrete slabs, and other suitable floors. The aluminum post slides over the centered 1-1/4″ square steel tube for a clean finished installation.

Choose an 18″ or 4′ tube height. Both versions use a zinc-coated 4″ × 4″ × 1/8″ steel plate with four 3/8″ corner mounting holes and a 1-1/4″ × 1-1/4″ center tube with a 1/8″ wall. For the best appearance, place the Alumission Aluminum Base Cover over the steel base before sleeving the aluminum post onto the tube.

Questions & Answers

Find clear answers about Wall Topper sizing, 6-foot spans, included components, base-plate installation, concealed fasteners, style differences, finishes, maintenance and field fitting.

Sizing & Planning

What span is the aluminum Wall Topper designed for?

Each Wall Topper section is designed around a nominal 6-foot span between posts. The supplied horizontal slats are 6 feet long. Verify the actual field measurement before cutting, and plan one post per span plus one terminal post at the end of the run.

Which Wall Topper heights are available?

All five Wall Topper styles are offered in seven nominal heights: 1 foot, 1 foot 6 inches, 2 feet, 2 feet 6 inches, 3 feet, 3 feet 6 inches, and 4 feet. Select the height that fits the project, then review the exact style-specific material schedule shown on the product page.

How do I plan a multi-span Wall Topper run?

Divide the finished run into nominal 6-foot sections. Use one post for each span and add one terminal post at the end of the run. Confirm corners, end conditions, wall steps, field cuts, post locations, and local requirements before ordering.

How do I measure an existing wall for a Wall Topper?

Measure the total finished run, each individual wall section, corners, steps, end conditions, and the usable mounting surface. Mark proposed post locations and check for caps, slopes, drains, utilities, or other obstructions. Use actual field measurements—not only nominal wall dimensions—before ordering or cutting.

Can the 6-foot Wall Topper slats be cut for a shorter span?

Yes. The aluminum slats are supplied in 6-foot lengths and may be field cut to fit a shorter verified opening. Use suitable cutting equipment, keep cuts square, remove burrs, protect the finish, and confirm the finished post-to-post dimension before cutting.

Kit Contents & Style Options

What is included with an Alumission Wall Topper kit?

The selected kit includes Aluminum Post 2 Channels, two channel covers and one cap per post, an 18-inch zinc-coated steel post base and matching aluminum base cover per post, 6-foot aluminum slats in the selected style and height, the required pattern spacers where applicable, and stainless steel self-drilling assembly screws. Wall anchors are not included because the correct fastener depends on the wall material and project conditions.

How do Dallas, Los Angeles, Miami, New York, and San Francisco styles differ?

Dallas combines wide 5.5-inch slats with a four-slat 1-inch accent band. Los Angeles uses evenly spaced 5.5-inch slats. Miami centers a four-slat 1-inch accent band between wide slats. New York is a tight-stacked full-privacy design with size-specific finishing slats. San Francisco uses closely spaced 1-inch slats for a linear look. See the exact material schedule and proportional drawings on each style page.

Is the Wood finish real wood?

No. The Wood option is a wood-look finish applied to aluminum slats, not natural timber. It provides the warmth of a wood appearance while keeping the low-maintenance, noncombustible aluminum construction of the Wall Topper system.

How much privacy does an aluminum Wall Topper add?

Privacy depends on the selected style, height, slat sizes, and spacing. New York is the most closed design, while Dallas, Los Angeles, Miami, and San Francisco create different levels of screening and visibility. Compare the style-specific drawings and material schedule before choosing.

Installation & Mounting

How do the base plate and base cover work?

Each post uses a zinc-coated steel base with a 4-inch by 4-inch plate and an 18-inch stem. The plate is anchored to a structurally suitable wall, the aluminum base cover slides over the plate to conceal the mounting screws or anchors, and the aluminum post slides over the steel stem. Plumb and align every post before installing the slats.

Can the Wall Topper be installed on concrete, masonry, wood, or steel?

Installation may be possible on concrete, masonry, properly reinforced wood, steel, or another structurally suitable wall when the correct substrate-specific anchors are used. Anchors are not included. The installer is responsible for confirming wall condition, edge distances, waterproofing, fastener selection, wind exposure, loads, and code or permit requirements.

Are anchors for the existing wall included?

No. Wall anchors are not included because the correct fastener and embedment depend on the wall material, wall condition, edge distances, loads, and site exposure. Select an anchor system specifically approved for the actual substrate and project conditions.

How do I know whether my wall can support a Wall Topper?

The existing wall and its foundation must be structurally suitable for the planned topper, anchors, height, and site loads. Inspect the wall for cracks, loose caps, deterioration, insufficient thickness, or other damage. When suitability is uncertain, have a qualified contractor or design professional evaluate it before installation.

Care, Ordering & Support

Does the Wall Topper require welding?

No welding is required for the kit assembly. Installation is a mechanical field-fit process that requires accurate measuring, cutting, drilling, leveling, fastening, and anchoring. Channel covers snap into place after assembly to conceal the slat-fastening screws.

Which finishes are available, and how should the Wall Topper be maintained?

Current finish options may include Black, Bronze, White, Dark Grey, Light Gray, and Wood. Availability can change by configuration. Clean powder-coated aluminum with water, mild soap, and a soft cloth; avoid abrasive pads, harsh chemicals, and tools that can scratch the finish.

What should I verify before ordering?

Confirm the total run length, selected style and height, number of 6-foot spans, post and terminal locations, corners or steps, wall construction, anchor plan, finish, field-cut requirements, access, wind exposure, and local rules. Product drawings support selection and installation planning but are not stamped structural or permit drawings.

Can a Wall Topper follow a stepped or sloped wall?

A stepped wall can often be planned as separate level sections with post locations and field cuts coordinated at each change in elevation. A continuously sloped wall requires a custom layout. Measure every section carefully and confirm the proposed arrangement with Alumission before ordering.

Do I need a permit or HOA approval for a Wall Topper?

Requirements vary by location and property. Check local height limits, setbacks, wind and structural rules, permit requirements, easements, and any HOA or architectural-review standards before ordering or installing. The product drawings are planning references, not stamped permit or structural drawings.