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Re: Mechanical concrete pad on 3" roof deck

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Paul & Daryl,

Since roof deck (unlike a floor deck)can not act as composite, any concrete fill in flutes will only add to the dead load and our deck is almost at its capacity. Insulation is part of the general detail for the roof and is also used to shape the necessary slopes for drainage. So I was thinking of filling the flutes with insulation and have less concrete, thus less dead load.


From: Daryl Richardson <h.d.richardson(--nospam--at)>
Reply-To: <seaint(--nospam--at)>
To: seaint(--nospam--at)
Subject: Re: Mechanical concrete pad on 3" roof deck
Date: Mon, 21 Jun 2004 16:21:21 -0600


Why not just pour the concrete directly into he roof deck flutes? Why use any insulation at all?

Regards,  H. Daryl Richardson

Reza Dashti Asl wrote:

> 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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