InsulDeck Deflection
Last Post 30 Jan 2013 03:17 PM by BrianBaron. 8 Replies.
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LbearUser is Offline
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19 Jan 2013 03:51 AM
With a 10" Joist and 4" slab (2" foam wing + 10" Joist + 4" slab) on a 24' simple span using InsulDeck, would would the deflection/sag/bounce be?

Preferably, one would not want to exceed a min. of 1/360 of the span (as per my architect).

Is it standard practice with Insul-Deck to allow movement over stud walls to allow for deflection?
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22 Jan 2013 02:58 PM
heheheheh - no disrespect Lbear... but 1/360x24' = 0.8" when loaded to max.

jokes aside
you would have to provide at least the Live Load and the rebar in beams...
For a 24' span - I think a couple of #6 bars would do the job just fine for up to 60psf LL at 300psi mix. Maybe keep the slab to 3" max to keep the DL down. Unless you have big big point loads such as cars
if all else fails consider a oh lets say 1/2" camber... super easy to shore it up this way...
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22 Jan 2013 07:04 PM
Posted By Baldwin2014 on 22 Jan 2013 02:58 PM
heheheheh - no disrespect Lbear... but 1/360x24' = 0.8" when loaded to max.

jokes aside
you would have to provide at least the Live Load and the rebar in beams...
For a 24' span - I think a couple of #6 bars would do the job just fine for up to 60psf LL at 300psi mix. Maybe keep the slab to 3" max to keep the DL down. Unless you have big big point loads such as cars
if all else fails consider a oh lets say 1/2" camber... super easy to shore it up this way...
Let's say a 40 lb/sf min. live load for general residential usage.

Is it standard practice with Insul-Deck to allow movement over stud walls to allow for deflection?
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22 Jan 2013 10:17 PM
If it's not bearing any ceiling weight, an interior studwall faced with drywall each side is about 10 pounds per square foot. The InsulDeck doesn't "bounce" the way a regular joisted floor does. There is a lot of mass there and it is quite stiff.
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22 Jan 2013 11:45 PM
Posted By ICFHybrid on 22 Jan 2013 10:17 PM
If it's not bearing any ceiling weight, an interior studwall faced with drywall each side is about 10 pounds per square foot. The InsulDeck doesn't "bounce" the way a regular joisted floor does. There is a lot of mass there and it is quite stiff.

I was told that concrete floors (2nd floor+) have some "bounce" to them. Are you saying that InsulDeck concrete floors don't bounce when compared to regular concrete floors or did you mean wood floors?
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23 Jan 2013 07:07 PM
We've had two 250 lb guys jumping and stomping up and down trying to see if there was any motion in the hairline cracks which appeared and the answer is no. It's true that they don't sound like a slab-on-grade, or feel as "solid" but in the same breath I'll say that you just can't detect any motion, either.
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30 Jan 2013 02:37 PM

LBear,
I see that you mention InsulDeck often. Did you consider Amvic Amdeck? I can't seem to find much info, but I like that it has steel beams and longer distances between shoring, and it seems like it is easier to use, but that is all based on the website.
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30 Jan 2013 02:55 PM
And what about OP-Deck?  Less shoring than some.
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30 Jan 2013 03:17 PM
Posted By eugenep on 30 Jan 2013 02:37 PM

LBear,
I see that you mention InsulDeck often. Did you consider Amvic Amdeck? I can't seem to find much info, but I like that it has steel beams and longer distances between shoring, and it seems like it is easier to use, but that is all based on the website.


InsulDeck / Quad-Deck has steel beams in the Deck also. The steel in InsulDeck and Quad-Deck is cast into the product making it an integral part of the deck form as opposed to the Amdeck where the foam sections are slid onto the steel. They may say up to 20' between shoring, but you wouldn't catch me out there with that little shoring.
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