Tectum Decking Dates?

[SteelPE]

I am looking a needed to reinforce an existing building for snow drift. I am trying to figure out when the original building was built and I am thinking it was the 1970's. This opinion is based upon the type of roof decking used, Tectum. Does anyone know of when Tectum deck became really popular to use in the North East US? Personally I have never used it, but run into it from time to time. This information is going to be used to figure the capacity of the existing joists.

 

[hokie66]

Not sure about popularity, but used a lot of it in the 70's, in Virginia. This article says the company started making it in 1949.

https://www.dispatch.com/story/business/2016/04/08/tectum-s-panels-popular-for/23936239007/

 

[EngineeringEric]

As scary as it is, it is still used today. I would think you are better dating the building through other means or a combination of architecture looks 70, tectum, carpet is shag orange, and the breaker box is dated 1975

OR do what i know you likely will, see what year has the weakest joist and run with that assumption

 

[jgailla]

My experience with assessing multiple military buildings of various ages indicates popularity of Tectum from 1950s through 1970s, probably highest in early 70s. I don't recall seeing its use after 1980. Sample size of maybe 2000 buildings built from 1950s through 2010s.

 

[SteelPE]

This thing has been added to and renovated so many times I can't really tell other than looking at the decking style. We are getting ready to put an addition next to this building and need to check the existing joists for the added snow drift. Seems like we would be in the realm of H and J joists...... seems like it would be best to assume a J as that gives lower values.