David Bolton Astragal Selection for Non-Rated Door Pairs: Getting the Meeting Edge Right Without Fire-Door Rules in the Way What This Article Covers and Who It Helps Non-rated door pairs -- double doors without a center mullion -- share a common problem: the gap at the meeting edge lets in light, air, sound, and foot traff... astragal commercial door hardware door pairs meeting edge seal weatherstripping Aug 14, 2026 Our Blog
David Bolton Why a Friction Hold-Open Arm Has No Place on a Fire Corridor Door (And What to Use Instead) The Problem Shows Up at Inspection, Not at Installation This article is for facility managers, commercial hardware contractors, and project architects managing corridor door openings in schools, healt... NFPA 80 automatic-closing devices corridor hardware door closers fire door compliance Aug 14, 2026 Our Blog
David Bolton What CSI MasterFormat Section 087100 Actually Controls (And Where Hardware Specs Break Down) What This Article Covers and Who It Helps If you are writing, reviewing, or bidding a project with a door hardware specification, the section number on the cover sheet is almost certainly 087100 — Doo... 087100 CSI MasterFormat commercial construction door hardware specification writing Aug 14, 2026 Our Blog
David Bolton Half Surface Swing Clear Hinges on Hollow Metal Doors: When You Cannot Mortise the Door The Problem No One Talks About Until the Door Is Already Hung This article is for contractors, facility managers, and architects who face a specific field condition: a hollow metal door that needs swi... ADA door hardware half surface hinges hinge selection hollow metal door hardware swing clear hinges Aug 14, 2026 Our Blog
David Bolton Floor Closers on Double-Acting Doors: What Changes When the Door Swings Both Ways The Problem With Putting a Standard Closer on a Double-Acting Door This article explains how door closers work differently on double-acting openings, which closer types are appropriate, and what speci... center-hung hardware commercial door hardware door closers double-acting doors floor closers Aug 13, 2026 Our Blog
David Bolton Why Cold Storage Doors Lose the Seal at the Bottom First (And How to Fix It) The Bottom Gap Is Where Cold Storage Energy Goes to Waste This article is for facility managers, maintenance technicians, and commercial contractors working on walk-in coolers, freezer rooms, food pro... automatic door bottoms cold storage hardware commercial door accessories door bottom seals threshold and weathersealing Aug 13, 2026 Our Blog
David Bolton Heavy Weight vs. Standard Weight Hinges on Fire-Rated Doors: Why the Wrong Choice Fails the Annual Inspection What This Article Covers and Who It Helps This guide is for commercial contractors, facility managers, and architects who specify or maintain hinges on fire-rated door assemblies. It focuses on a spec... NFPA 80 commercial hardware fire-rated doors hinges inspection compliance Aug 13, 2026 Our Blog
David Bolton Drill Attacks on Door Cylinders: What Protection Options Actually Work and When to Specify Them Why Cylinder Drilling Is a Real Threat on Commercial Openings A drill attack on a pin-tumbler cylinder is one of the fastest and most common forced-entry methods on commercial and institutional doors.... UL437 commercial-door-hardware cylinder-guards cylinders high-security Aug 12, 2026 Our Blog
David Bolton When the Frame Sticks Out Too Far: Selecting a Closer Arm Extension for Deep Reveal Openings The Problem Nobody Catches Until the Closer Is Already Mounted This article is for commercial contractors, hardware schedulers, and facility maintenance teams who have run into a door closer that bind... closer arms commercial doors deep reveal door closers hardware specification Aug 12, 2026 Our Blog
David Bolton The Hold-Back Function on a Mortise Lock: Why Getting the Trim Package Wrong Costs You a Second Trip What This Article Covers and Who It Helps A hold-back mortise lockset sounds straightforward: turn the inside lever or thumb piece, the latch retracts and stays retracted until you release it. But the... Grade 1 locks commercial door hardware hold-back function installation tips mortise locksets Aug 12, 2026 Our Blog
David Bolton No Knuckles, No Gaps: How Concealed Hinges Work on Flush Wood Doors What This Article Covers Concealed hinges -- sometimes called invisible hinges or European-style hinges -- are fully mortised into both the door edge and the frame so that no knuckle, barrel, or pin i... architectural hardware concealed hinges door specification flush wood doors invisible hinges Aug 11, 2026 Our Blog
David Bolton The Case for a Fourth Hinge: When Three Just Is Not Enough Why the Three-Hinge Default Leaves Some Doors Underhung Most commercial doors get three hinges and move on. For a standard 3'0" x 7'0" x 1-3/4" hollow metal door in an office corridor, that is exactly... commercial door hardware door hardware specification fire door compliance hardware schedules hinges Aug 11, 2026 Our Blog
