Be aware that transite is an asbestos-containing material (ACM). Once
disturbed, it can become friable (airborne particles). This hazardous
material is regulated - at least in California - by a thick body of laws,
and can only be removed by contractors licensed to handle ACM's. I would
advise not to change either its loading or to otherwise disturb without
the advice of such an expert. Left alone and undamaged, it is a legal
material, and not generally considered friable. Once disturbed, you may
be soon in the attorney's arena, and likely a no-win situation.
On Tue, 29 Feb 2000 05:16:19 -0800 "Robert W. Williams"
> On a current project, a client has requested that I perform
> evaluation on an existing roof system for a primary freezer
> facility. The
> roof which was constructed in the mid 1960s is comprised of 16"
> steel joists
> spaced at 48" o.c. and corrugated asbestos-cement (transite) roof
> The transite deck has been filled with a lightweight concrete to
> provide a
> level surface for the roof insulation. The client wants to put a new
> roof on
> the freezer facility; however, they do not want
> to remove the transite decking. The roofing contractor plans to
> strip the
> roof of its existing components down to the concrete
> leveling fill and install the new roof components. The new roof dead
> will be approximately 50% of that of the existing.
> With the new roof dead load being decreased, one should feel
> safe about leaving the transite deck in place; however, I am
> concerned about
> the integrity of the transite panels. Based on a site visit, the
> seems to be in good condition with no visible signs of flaking or
> Based on a visual examination is it safe to assume that the deck
> possesses it strength characteristics.
> For the roof analysis I would like to run some quick
> numbers on the existing transite deck with the new roof dead load
> and live
> loads as required by the current building code. Unfortunately, I
> know very
> little about the material properties of transite. What is it's
> modulus of
> I have searched the company library and have not found any
> information on the transite decking. For comparison purposes, it
> would like
> to find some older vendor information on these transite deck panels
> section properties, load tables,
> etc.). If anyone has any information on 3/8" thick decking with 3"
> corrugations spaced at 4 1/2" center to center, I would greatly
> it. My fax number is 404-370-3646. Any recomendations regarding
> or other concerns would also be helpful.
> Thanks for the Help.
> Rob Williams
> AGRA Simons Atlanta
> Associate Engineer, Structural