Datacenter owner/operator and retired engineering contractor here. They are not talking about “mechanical” systems such as HVAC, they are instead describing a “Mechanically attached roofing system”. That’s a specific term, and covers metal roofs of a specific type and construction.
See: https://msrs.com/new-construction/fully-adhered-vs-mechanically-attached/ Concrete is a superior substitute. Concrete deck your datacenter and you’re done. It’s considered pretty bulletproof. Figuratively and literally. Our DCs have concrete floors walls and ceilings. -Ben > On Sep 14, 2018, at 8:34 AM, Andrew Latham <[email protected]> wrote: > > I would have to go check for sure but I believe it applies to screws or bolts > that could pierce the membrane. A well sealed roof is all they are looking > for. > >> On Fri, Sep 14, 2018 at 10:03 AM Valeriu Vraciu <[email protected]> wrote: >> Hello, >> >> >> It may be somehow offtopic, but maybe someone can help understand the >> meaning of a requirement for Tier 4 DC. >> >> We have a project to build a Tier 4 datacenter. One of the requirements >> specified in TIA942 and related to roof of the building sounds like this: >> >> "double redundant with concrete deck (no mechanically attached systems)" >> >> For my understanding (being not a native English speaker) what exactly >> does this mean ? >> 1. no mechanically attached to the roof systems (gear, equipment) like >> air-conditioning, generators etc. >> >> or >> >> 2. the roof (double) is made from components that are not mechanically >> attached with bolts and such. >> >> >> Thanks in advance. >> >> >> -- >> Valeriu Vraciu >> RoEduNet >> > > > -- > - Andrew "lathama" Latham -
