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Old 08-28-2008, 11:49 AM   #1
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Roof support post anchors


i have just applied for a building permit to build a replacement roof (aluminum canopy).
The new roof will be using 2X8X8 foot rafters, support by a ledger board at one end and resting on a beam constructed from three, 2X10X12 foot lumber.
The beam is to be supported by 6X6 posts.
The base of these posts will rest on the surface of the existing concrete deck.
I've been informed that the posts must be fastened to the concrete deck by the use of a engineered fastening method.
When I provide engineered drawings, showing the engineers stamp, I will be issued the permit!
Can someone explain to me what this means? And also tell me what is the proper method of attaching these posts.

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Old 08-28-2008, 12:37 PM   #2
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Roof support post anchors


the reason to have them fastened to the concrete is to stop 'drifting'. look in the yellow pages and find an engineer/architech and call and ask how much it would cost for the plans. it may be upwards of 100 or more $$$, but you'll be able to get going!

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Old 08-28-2008, 12:44 PM   #3
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Roof support post anchors


also.... a 'concrete deck' says to me "thin layer of concrete." how thick/reinforced is this slab? that's a lot of weight you're looking at! around here, they'd make you dig down 42" and make a 2 or 3 foot dia. pad! resting on a deck, even with fasteners sounds weak to me.

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Old 08-28-2008, 05:03 PM   #4
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Roof support post anchors


The pad is 6" plus and rests on 8" poured concrete walls.
These walls were poured in a 24" deep trench, with no footings.
I was required to underpin under the post locations with a 16"X16"X6" footing at a depth of 48", to support a Sono tube 8" column.
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Old 08-28-2008, 05:10 PM   #5
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Roof support post anchors


Quote:
Originally Posted by Wildie View Post
i have just applied for a building permit to build a replacement roof (aluminum canopy).
The new roof will be using 2X8X8 foot rafters, support by a ledger board at one end and resting on a beam constructed from three, 2X10X12 foot lumber.
The beam is to be supported by 6X6 posts.
The base of these posts will rest on the surface of the existing concrete deck.
I've been informed that the posts must be fastened to the concrete deck by the use of a engineered fastening method.
When I provide engineered drawings, showing the engineers stamp, I will be issued the permit!
Can someone explain to me what this means? And also tell me what is the proper method of attaching these posts.
this is what your looking for
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Old 08-28-2008, 05:57 PM   #6
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Roof support post anchors


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Originally Posted by buletbob View Post
this is what your looking for
Yes! This sure looks like the ticket!
I'll Google Zmax and see if I can locate a dealer
Thanks!
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Old 08-28-2008, 06:00 PM   #7
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Roof support post anchors


you should be able to locate this at any home center or lumber yard.
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Old 08-28-2008, 06:52 PM   #8
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Roof support post anchors


Propose to the code official anchoring 1/2" or 5/8" all-thread into the footings with concrete epoxy. An elevated post base like the picture above can be anchored quite securely with a setup like that.

He might back off the requirement for an engineer's blessing with a good solid setup like that. Or, he might go ahead and require it due to liability and jurisdictional policy.
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Old 08-28-2008, 09:51 PM   #9
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Roof support post anchors


I called an old acquaintance that is a construction tech. and he will arrange for the drawings, stamped by his boss.
The boss being a P.Eng.
About 20 years ago, I wired this guys rec room at no charge, so he'll provide the drawing free gratis! [smiling]
The fastener that he described over the phone, sounds similar to the one shown above!
Thanks all! For your replies!

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