Combo Aluminum Products

What Combo Aluminum Products does

Combo Aluminum Products is a US specialty manufacturer of precision-engineered aluminum exterior door components, founded in 1959 in El Cajon, California by Wally Miller (originally as W.W. Miller Company). The company's product line centers on thresholds (residential, commercial ADA, insulated, outswing, and combination sill designs), door bottoms and sweeps, jamb weatherstripping, astragals, replacement seal inserts, sill covers, fabrication services, and metal moulding. The technology stack is mechanical rather than digital: aluminum extrusion and fabrication, substrate-integrated insulation for thermal performance, low-profile beveled designs for ADA accessibility, and custom sill notching for precise fit. The original Combo Sill patent by Miller in 1959 established the company's product category leadership, and the brand has operated continuously for over 65 years from the same El Cajon headquarters.

The business model is direct hardware sales with no recurring or subscription revenue. Pricing is quote-based, and orders are fulfilled in under two weeks, a lead time the company characterizes as up to four times faster than typical industry timelines. The go-to-market is sales-led, combining inbound phone/contact-form inquiries with a network of four authorized representative firms (Pacific North-West, Onshore Sales, EZ Sales Co., Columbia Crest Agency) that provide regional coverage across the US. The company targets contractors, builders, and construction professionals in both residential and commercial segments, serving functional needs around weatherproofing, energy efficiency, ADA compliance, and door durability.

Combo Aluminum is a privately held, founder-descended company (currently led by President Roy Tovar) with no disclosed institutional investors, parent company, or M&A activity. The company employs 11-50 people at a single El Cajon site, and revenue is not publicly disclosed. Geographic scope is the United States only, with no international footprint, no digital product offerings, and no API or software platforms. The competitive positioning rests on American-made manufacturing, the legacy Combo Sill brand, fast delivery, and a comprehensive catalog spanning residential and commercial specification requirements.

Name

Combo Aluminum Products

Legal name

Combo Aluminum Products

Website

https://comboaluminum.com

Company type

Private

Founded year

1959

Operating status

Operating

Headcount range

11–50 employees

Short description

Combo Aluminum Products is a US specialty manufacturer of precision-engineered aluminum exterior door components, including thresholds, door sweeps, weatherstripping, and astragals, serving residential and commercial contractors and builders since 1959 from El Cajon, California.

Ownership category

akta.pro rank

Product category

Door Hardware Manufacturing

NAICS

Metal Window and Door Manufacturing (332321), Ornamental and Architectural Metal Products Manufacturing (33232)

SIC

Metal Doors, Sash, Frames, Moldings & Trim (3442), Sheet Metal Work (3444)

akta.pro primary industry

Aluminum Value-Added Components (Automotive, Aerospace, Packaging, Building Systems) (IMAKACAM)

akta.pro secondary industry

Aluminum Fabrication & Finishing (Machining, Anodizing, Coating) (IMAKACAI)

Keywords

• Aluminum thresholds
• Door sweeps
• Weatherstripping products
• Door astragals
• Sill covers

Headquarters

HQ city

El Cajon

HQ country

United States

HQ region

North America

Offices1 record

Markets served

GTM type

B2B

Offering type

Hardware or Manufacturing

Cost components

Supply Chain, Personnel, Operations, Infrastructure, Marketing or Sales

Revenue model

1. Aluminum Door Component Sales: One-time hardware sales of precision-engineered aluminum exterior door components including thresholds, door sweeps, weatherstripping, astragals, and accessories. Products are sold directly to customers in the building and construction industry with no recurring revenue model.

Pricing tiers

Go-to-market motion1 record

Distribution channels2 records

Marketing channels3 records

Core offering

Combo Aluminum Products manufactures aluminum door hardware for exterior door systems, including combination sill thresholds, door bottoms and sweeps, weatherstripping, astragals and meeting stiles, metal moulding and floor trim, sill covers, and replacement seal inserts. The products serve residential and commercial construction applications, with options for custom fabrication.

Product overview

Combo Aluminum Products offers a unified product line of precision-engineered, American-made aluminum exterior door components for the building and construction industry. The core portfolio centers on thresholds (residential, commercial ADA, insulated, outswing, and combination sill thresholds), door bottoms and sweeps, weatherstripping (jamb weatherstrip), and astragals for double doors. These are complemented by fabrication options, replacement seal inserts, sill covers, and metal moulding/floor trim accessories. The product line is engineered for durability, weatherproofing, and long-term protection of entryways, with fast delivery (typically under two weeks) distinguishing the company in the industry.

Differentiator

Problem solved

Functional benefit

Products and services

• Door Bottoms & Sweeps Aluminum door bottoms and sweeps that seal the gap at the bottom of exterior doors; sold to contractors and builders for residential and commercial door installations.
• Combination Sill Thresholds Aluminum combination sill thresholds that integrate with door bottoms to seal the threshold area of exterior doors; used by contractors in residential and commercial construction.
• Residential Thresholds Aluminum thresholds designed for residential exterior door installations, providing a weather-resistant transition between interior flooring and the door bottom.
• Insulated Sill Thresholds Insulated aluminum sill thresholds using the company's patented Combo Sill design to reduce thermal bridging at exterior door sills; specified by builders and contractors for energy-efficient residential and commercial doors.
• Outswing Thresholds Aluminum thresholds designed specifically for outswing exterior doors, providing a weather-sealed sill for outward-opening door systems used in residential and commercial construction.
• Commercial ADA Thresholds Aluminum thresholds engineered for commercial exterior door assemblies to meet ADA accessibility requirements, specified by contractors for code-compliant commercial projects.
• Jamb Weatherstrip Jamb weatherstripping products that seal the perimeter gaps along the sides and top of exterior door frames; used by contractors alongside thresholds and sweeps to complete the door sealing system.
• Astragals & Meeting Stiles Aluminum astragals and meeting stiles that seal the meeting edge of paired or French exterior doors; specified by contractors for double-door installations in residential and commercial buildings.
• Metal Moulding & Floor Trim Aluminum metal moulding and floor trim pieces used to finish floor and threshold transitions at exterior door openings in residential and commercial construction.
• Replacement Seal Inserts Replacement seal inserts that renew the weather sealing performance of existing aluminum thresholds, sweeps, and weatherstripping; sold to contractors and facility maintenance buyers for service and replacement work.
• Sill Covers & Accessories

Quantifiable outcome

• Delivery time reduced by up to 4x compared to typical industry timelines

Segments3 records

Ideal customer profiles1 record

Technology focussed No

API detail

Has API

No

API docs

API detail

Core technology

AI maturity

App detail

Feature3 records

Partnerships

Four partnerships are on record, tiered core.

• Pacific North-WestcoreChannel Partner/ Reseller/ DistributorAuthorized representative firm providing local support and product expertise for Combo Aluminum products in the Pacific Northwest region.
• Onshore SalescoreChannel Partner/ Reseller/ DistributorAuthorized rep firm for Combo Aluminum, offering local support and product expertise. Website: onshoresales.com
• EZ Sales Co.coreChannel Partner/ Reseller/ DistributorAuthorized representative firm providing local support and product expertise for Combo Aluminum products. Website: ezsalesco.com
• Columbia Crest AgencycoreChannel Partner/ Reseller/ DistributorAuthorized rep firm for Combo Aluminum, offering local support and product expertise. Website: columbiacrestagency.com

Scale indicators2 records

Recent moves5 records

Expansion highlights3 records

Direct peers

• Reese Enterprises: Reese manufactures weatherstripping, thresholds, and door bottom products for residential and light commercial doors. Directly comparable to Combo Aluminum in product categories, materials, and customer base.
• Endura Products: Endura Products manufactures door components including sills, astragals, and weatherstripping for exterior door systems. Directly competes with Combo Aluminum in the precision-engineered aluminum door component space.
• Zero International: Zero International produces thresholds, weatherstripping, and acoustic/smoke seals for commercial door openings. Directly competes with Combo's commercial ADA threshold and astragal product lines in commercial construction specifications.
• M-D Building Products: M-D Building Products is one of the largest US manufacturers of thresholds, weatherstripping, door sweeps, and floor trim. Directly comparable to Combo Aluminum as a competitor in the same product categories serving the same contractor and builder customer base.
• National Guard Products (NGP): NGP is a US manufacturer of thresholds, weatherstripping, and door accessories for commercial buildings. Direct competitor in the commercial threshold and ADA-compliant product category that Combo serves.
• Pemko (ASSA ABLOY): Pemko manufactures thresholds, weatherstripping, astragals, and sound seals for commercial and residential doors. Directly competes with Combo Aluminum in the architectural door hardware space with overlapping product lines and similar customer segments.

Emerging players

• Draftstoppers Inc / Therma-Tru Weatherstrip: Therma-Tru and related weatherstrip suppliers are increasingly bundling thresholds and weatherstripping with door systems. Comparable as a category-level competitor and potential channel partner or substitute supplier for Combo's builder customers.

Broad incumbents

• Hager Companies: Hager Companies is a broad-line manufacturer of architectural door hardware including thresholds, weatherstripping, and full door hardware packages. Competes with Combo Aluminum in the threshold category while serving a much broader product portfolio.
• AmesburyTruth (ASSA ABLOY): AmesburyTruth manufactures weatherstripping, door seals, and threshold components for residential and commercial doors as part of ASSA ABLOY's entry sealing portfolio. Larger incumbent with overlapping aluminum and vinyl-based sealing products.

Regional players

• KNC Weatherstripping: KNC manufactures weatherstripping and door sealing products with regional distribution strength. Comparable to Combo in weatherstripping categories, with potentially narrower geographic coverage than Combo's nationwide rep network.

Market position

Strengths5 records

Weaknesses5 records

Competitive moat4 records

Key risks5 records

Key highlights6 records

Customer concentration

Revenue estimate

Valuation estimate

Number of profiles

Profiles1 record

Funding overview

Funding rounds

Investors

Funding detail is available on the Subscription and Enterprise plan.Contact sales →

M&A

Investments

M&A and investment is available on the Subscription and Enterprise plan.Contact sales →

Frequently asked questions about Combo Aluminum Products