Type IV Construction

We are continuing to look at the different types of construction and the characteristics of each.  This post will outline considerations of Type IV or Heavy Timber construction.

Heavy timber construction is a type of construction we don’t see popping up in new buildings very often. However, there are still a great many buildings that are or were Type IV construction in our jurisdictions.  We need to identify these buildings in both circumstances.

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True heavy timber construction does not have void spaces. It is built with masonry or brick exterior walls with large diameter, six inches and more, interior structural components.  There have been debates about how these large beams and structural elements hold up to fire and some have found the large diameter wood components to hold up longer than steel.  The reason for this is that the steel will elongate and deform at around 1000 degrees and is prone to failure at that point. The large diameter components may burn, but they hold their integrity longer than the time it takes for steel to deform.  Obviously, there are variables, but an interesting bit of information.

These fires burn hot and for a long time. These are typically large buildings and have an additionally large fire load, making extinguishment difficult.  Many times we find these buildings in more urban areas and in highly dense locals. However, churches and resort lodges are common places for this type of construction.  Exposure protection is of the utmost importance and establishing an effective collapse zone is important.

When these building get remodeled and are altered, they can then be considered Type III construction.  The reason for the Heavy Timber classification is the benefit of the extended time of burning and the lack of void spaces. We lose some of that as false ceilings and new framed walls and floors are added to create lofts or office space.  Just something to consider because you will need to plan accordingly for the interior changes that are being made to these types of buildings.

Train hard, master the basics and have plan before you go to battle. Stay safe.

Lodge picture from Vermont Timber Works, visit them at vermonttimberworks.com

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Jason Hoevelmann

Deputy Chief/Fire Marshal with the Sullivan Fire Protection District, a combination department, and a career firefighter/paramedic with the Florissant Valley Fire Protection District in North St. Louis County.

FE Talk: Humpday Hangout

Bertie Shiver Johnson
Cleveland School Fire of 1923
I have read this story over and over. I do genealogy and think I have some relatives..doing more research. Thanks for putting this out there.
2015-09-29 21:40:23
Jim lang
How Dare You!-We Can No Longer Tolerate Incompetence!
Direct result of lowering the Standards also and giving everyone a chance! The Job is no longer a calling it's just a Job to many these days! No more Pride Tradition Brotherhood etc etc....
2015-09-20 18:21:25
How Dare You!-We Can No Longer Tolerate Incompetence!
Saya setuju dengan pendapat dan pengalaman anda. Pekerjan rutin seorang petugas pemadam kebakaran adalah berlatih dan terus berlatih. Dan apabila di antara teman petugas pemadam kebakaran disini yang mempunyai materi latihan boleh kah saya meminta materi latihan pemadam kebakaran itu ? Salam kenal dari saya Petugas pemadam kebakaran bandara kualanamu international Medan Sumatera Utara Indonesia.
2015-09-20 17:13:40
How Dare You!-We Can No Longer Tolerate Incompetence!
Two years ago I was being trained and tested on required performance. I was able to do all but a duties. I attended every training session, asked questions and researched matters related to fire fighting. I couldn't drag another fire fighter and I had trouble "throwing" a ladder from ground to roof. I was released…
2015-09-20 16:35:03
How Dare You!-We Can No Longer Tolerate Incompetence!
Excellent article, after 30 years on the job I agree. What has always bothered me was why do firefighters too often find themselves in trouble? Why are we on an ice covered roof when we could more easily and safely removed glass from the second story. Why open up a confined space of decades dried…
2015-09-20 14:10:34

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