Re: tier 4 datacenter requirement "translation"

[Ben Cannon <ben () 6by7 net>]

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 <lathama () gmail com> 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 <valeriu () roedu net> 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 -