Printed from the blog of Lori Greene, AHC/CDC, CCPR, FDAI
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Gasketing & Thresholds

Fire Door Clearance

The 2007 edition of NFPA 80 contains an important change regarding the clearance at the bottom of a fire rated door.  In previous editions of this standard, there was a somewhat confusing table (Table 1-11.4) listing different allowable clearance dimensions depending on the flooring material.  The 2007 edition simplifies this requirement, allowing 3/4″ clearance under […]

Astragals with Vertical Rod Panics

An astragal is a piece of molding used on a pair of doors or between the top and bottom leaves of a Dutch door, to provide security, protect against weather conditions, prevent light or sound transmission, or to retard the passage of smoke, flame, or gases during a fire.  On a Dutch door the astragal is […]

Closer Seals

One of my (non-hardware industry) friends commented recently that she’s been reading this blog and can’t believe how complicated doors and hardware are.  It’s true!  There are a thousand ways to screw up a door and I’ve made my share of mistakes over the years, but at this point I often spot problems from across […]

Classroom Acoustics

One of our specwriters recently received a memo from an acoustical consultant regarding a school project that he was working on.  The memo referenced a standard called ANSI-ASA S12.60 – Acoustical Performance Criteria, Design Requirements, and Guidelines for Schools. This standard was developed by ANSI and the Acoustical Society of America (ASA) in 2002 (reaffirmed […]

Hospital & Nursing Home (I-2) Cross-Corridor Pairs

The 2009 edition of the International Building Code (IBC) contains an important change that’s easy to miss if you’re not looking for it.  I stumbled across it a few months ago when someone asked me about the exception for cross-corridor doors without positive latching in I-2 occupancies. This exception is found in Section 709 – Smoke […]

Survey Q4: “What are some ‘rules’ regarding fire doors?”

This is the 6th post in a series about fire doors and the results of a recent (unscientific) survey. For anyone who is just tuning in or has lost track of this series of posts, I conducted a survey about what the general public knows about fire doors and I learned 2 things – 1) […]

Smoke – Smokeproof Enclosure

According to the International Building Code (IBC), every required exit stairway that extends more than 75 feet ABOVE the lowest level of fire department vehicle access (high rise buildings), and every required exit stairway that serves floor levels more than 30 feet BELOW the level of exit discharge must comply with the referenced sections on […]

Meeting Stile Gasketing

“It’s not what you know, it’s who you know…” …and lucky for me, I know A LOT of people!  There are plenty of things that I don’t know but I can usually figure out who to call to get an answer.  Lee Echols left a question on the Facebook Fan Page an embarrassingly long time […]

WWYD? – Church Pair Meeting Stiles

I saw this church from the highway on our way into Roanoke, Virginia last week – it’s St. Andrews Catholic Church, and I just knew it would have some nice doors.  As soon as I approached the building from the parking lot, I spotted the meeting stile gasketing.  Most people would probably see the building […]

Water Intrusion

I need some help, and after giving the architect my suggestions I told him that I’d ask all of you for ideas. The building in question has a large assembly space on the 5th floor roof.  There is a pair of doors that swing from the roof deck into the building.  Everything was fine until […]

Reader Photos

It’s time to clean out my inbox again!  Here are some of the reader photos I’ve received.  Thanks to all who sent them! Denise Gorski of Ingersoll Rand Security Technologies spotted these fire and egress door problems at a hotel.  I’m sure they have been repaired “without delay” as required by NFPA 80, right?   […]


Last week I read a blog post called, “Excuse me, but your slip is showing,” from Constructive Thoughts, the blog of Sheldon Wolfe.  I’m a sucker for a well-researched article on a code-related topic, so I sent Sheldon an email asking if I could reference his post here.  Sheldon told me to have at it, […]

Gasketing on Stair Doors

If you read this paragraph in a vacuum, it seems like all fire doors have to limit the air infiltration to this level (in most cases this would require gasketing), but this paragraph falls under section 716.5.3 – Door assemblies in corridors and smoke barriers. There are two sections following 716.5.3 that apply to other types of fire doors…

Allegion to acquire Zero International

Looking forward to working with my friends at Zero! Here’s the latest news from Tim Eckersley to Allegion customers…

SDI: Smoke Gasketing Requirements for Opening Protectives

Questions on smoke gasketing continue to come up, so the Steel Door Institute asked me to write about it for their quarterly newsletter. You can subscribe to their newsletter here…

Q&A: Solid Bar Gasketing

After 7 years of posting a new piece of door & hardware information on this blog every day, it makes me very happy to receive a new question that I haven’t thought about before. Last week’s question was related to the solid bar gasketing designed to allow closer shoes (and other hardware) to be attached directly to the gasketing…

QQ: Gasketing Requirements of NFPA 101

Which door openings are required to have gasketing, according to NFPA 101 – The Life Safety Code?

QQ/WWYD? Excessive Clearance on Fire Doors

The rapidly-approaching deadline for fire door inspections in health care facilities is resulting in LOTS of questions about fire door assemblies.  The most FAQ in the last few weeks has been… When a fire door has more clearance than what is allowed by NFPA 80, can a door sweep and/or gasketing be added to solve […]

FF: Sharpie Seal

Ian Baren of Katonah Architectural Hardware sent me today’s Fixed-it Friday photo.  This mortise lock is on a very fancy clothing store, and apparently it was an aesthetic problem for someone that the gasketing did not continue down the lock face.  So they drew it in with a Sharpie!  You’d think that if they were […]

QQ: Gasketing Continuity

During a fire door assembly inspection, should a flashlight be used to verify whether the gasketing is continuous?

QQ/WWYD? Door Bottom Clearance

When inspecting a fire door assembly, how do you measure the clearance at the bottom of the door when the clearance varies between the push side and the pull side?

Sill vs. Threshold

During the discussions about yesterday’s post someone mentioned the “sill” of the fire door assembly, which reminded me of a clarification that has been made in NFPA 80 in the 2016 edition.

WW: Water Feature

I have never seen anything like these Wordless Wednesday videos that were sent to me by Mary Hinton of Mulhaupt’s, Inc. This may be more than a rain drip can handle.

Decoded: Thresholds and Gasketing for Fire Doors and Smoke Doors (June 2019)

Thresholds and gasketing are simple in comparison to other types of hardware, but the code requirements can make them difficult to properly specify and supply.

See the index for another category:

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