Frequently Asked Questions

Installations for products offered by Inline Design must comply with local and national building codes. Inline Design provides relevant information about code compliance throughout the website, specification sheets and instructional booklets. The information may only serve as a guide (advisory capacity) and should not be used to address building compliance issues or compliance with safety standards. Inline Design is not liable for any non-compliance that may arise from installations or improper use of company products. For more information about local building codes, customers are encouraged to contact their city specialist or contact a relevant Authority Having Jurisdiction (AHJ).

Engineering Specifications 

Prior to using any railing products from any vendor it is incumbent on the homeowner, designer, fabricator and installer to make themselves familiar with local building codes that apply to their applications.  While our products are designed to meet the code requirements for the International Residential Code (IRC) and International Building Code (IBC) requirements we do not specify the method to attach the system to the structure.  

Every effort is made at Inline Design in the design of our products to meet the structural strength requirements for handrail, guardrails and ADA rails.  Our engineering team works hard to to make sure all designs meet both the International Residential Code (IRC) and International Building Code (IBC) requirements.

The strength of the balusters are tested so that a one-square foot area must resist 50 lbs of force. 

The top rail must be able to sustain 125 lbs of force applied horizontally or vertically. 

The top rail must be capable of holding a point load of 200 lbs of force applied to the mid span, on the side of a post and on top of a post. 

A safety factor of 2.5 is usually added to the testing.

We are currently in the process of working with one of the leading Mechanical Engineering Firms to have our entire family of products receive a general Engineering Stamp that support these codes.


Our Products are made from ANSI 316 Stainless Steel

All of our railings and components are comprised of high-quality, marine-grade 316 stainless steel. This robust material is suitable for indoor, outdoor and beach-front areas. 316 stainless steel is excellent for applications within five miles of saltwater or seawater due to its corrosion-resistant properties.

This type of stainless steel contains a higher concentration of molybdenum, compared to other stainless-steel variants, resulting in active resistance to pitting and corrosion that is common in marine-based locations, docks, shipyards, commercial sites, industrial facilities and general public locations.

Our 316 stainless steel components are randomly lab tested to ensure the metallurgic makeup meets the standards for 316 stainless steel and corrosion resistance. Testing is conducted by Metal Test Inc. in Kent, WA.

11/6/2018 - Lab Test Documents
9/27/2016 - Lab Test Documents
8/21/2015 - Lab Test Documents
6/13/2013 - Lab Test Documents


Engineering specification documents that comply with the American National Standards Institute (ANSI), American Society for Testing and Materials (ASTM), Americans with Disabilities Act Accessibility Guidelines (ADA) and National Association of Architectural Metal Manufacturers (NAAMM) can be downloaded below:

Bar Railing System - Seattle Bar

Rather than being a true square bar, each horizontal steel bar that spans posts is rectangular, measuring 9/16″ x 3/16″ x 8.2’. These bars are sturdy and sleek, without looking bulky. For compatibility during installation, Inline Design offers two post-kit options: 36″ and 42″.  These are available in surface and fascia mounting options.

Posts measuring 36″ are fabricated to require seven spans of horizontal bars between each post. Taller posts measuring 42″ are fabricated to require nine spans between each post.  Each of these posts can be used as an end or middle post. We also offer 36″ and 42″ fabricated corner posts.