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Re: Mechanical concrete pad on 3" roof deck

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I would utilize the composite properties of the deck and do a complete
concrete fill for the pad area.  Otherwise the deck is going to have to be
assumed to carry the pad and the units as straight load.

4 inch is typically a minimum for a couple of reasons.  One is the sound and
vibration control.  The other is that most post-installed anchors require a
4" slab to develop anchorage forces.


Paul Feather PE, SE
pfeather(--nospam--at)SE-Solutions.net
www.SE-Solutions.net
----- Original Message ----- 
From: "Reza Dashti Asl" <rezadashti(--nospam--at)hotmail.com>
To: <seaint(--nospam--at)seaint.org>
Sent: Monday, June 21, 2004 2:14 PM
Subject: Mechanical concrete pad on 3" roof deck


> Hi,
> In one of our projects we have been asked to provide 4" concrete pad for
> mechanical equipments (like roof top packages) on 3" metal roof deck.
> 1- Can we have 3" insulation in low flutes and then pour the concrete on
top
> or even have more insulation (if required) and then place the concrete on
> top of the insulation? What are the possible problms or requirements that
I
> should check?
> 2- Is 4" the min. required thickness for these pads or can we have, say,
> 2.5" or 3"?
> I appreciate all comments.
>
> Reza Dashti P.Eng.
> Vancouver, BC
>
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