FRT wood trusses
FRT wood trusses
(OP)
I have a building with light weight trusses (2" x 8" top and bottom chords with 2" x 4" diagonals) in which the diagonals have failed and pulled away from themselves at the top chords. It looks like the wood may have been treated. The project is circa 1980. Need help with determining if the wood was treated, did the treatment reduce the strength and how can this be determined.
Thanks you
Thanks you





RE: FRT wood trusses
Mike McCann
MMC Engineering
Motto: KISS
Motivation: Don't ask
RE: FRT wood trusses
They only remedy I ever heard of was to completely replace the roof system - trusses and plywood.
Many lawsuits were filed over this problem You can probably Google it and find them.
Sorry and good luck.
RE: FRT wood trusses
RE: FRT wood trusses
Mike McCann
MMC Engineering
Motto: KISS
Motivation: Don't ask
RE: FRT wood trusses
Mike McCann
MMC Engineering
Motto: KISS
Motivation: Don't ask
RE: FRT wood trusses
Mike McCann
MMC Engineering
Motto: KISS
Motivation: Don't ask
RE: FRT wood trusses
Mike McCann
MMC Engineering
Motto: KISS
Motivation: Don't ask
RE: FRT wood trusses
Mike McCann
MMC Engineering
Motto: KISS
Motivation: Don't ask
RE: FRT wood trusses
As a side note, 2X8 T&B chords seem a bit large, unless this is in a high snow load or long span condition.
Sorry for the large number of posts here...
Mike McCann
MMC Engineering
Motto: KISS
Motivation: Don't ask
RE: FRT wood trusses
The wood, in early FRT processes, produced brittle wood. Google
Hoover frt.
RE: FRT wood trusses
If the lumber is treated in any way, the strength will be decreased unless the designer took that into consideration when they were designed. Probably best to get a PE to do the calculations ant tell you what kind of repairs are needed, but may be simpler and more cost effective to just rip it off an replace them.