Camerops Posted August 3, 2021 Share Posted August 3, 2021 How can place 2" ridged insulation under 4" basement floor slab where the top of the insulation is equal to top of footing and the bottom of 4" slab is the top of footing? Link to comment Share on other sites More sharing options...
GeneDavis Posted August 3, 2021 Share Posted August 3, 2021 Your floor slab structure will have two layers, foam under concrete. It'll show in sections, and for the 3D look, turn it up and look at the bottom side. Blue foam with the CA logo! Link to comment Share on other sites More sharing options...
richoffan Posted August 4, 2021 Share Posted August 4, 2021 As Gene said, the floor composition is in the structure tab>edit floor. You can build the floor layers similar to "building" a wall. You adjust the elevation of the materials with absolutes, rough and most important stem wall - top of footing to top of mud sill. Set your heights relative to all your structural elements and required rough height and you'll be fine Link to comment Share on other sites More sharing options...
Camerops Posted August 4, 2021 Author Share Posted August 4, 2021 The impression I have from looking at the room specification panel's elevation diagram is the insulation is sitting on the footing. I want it to sit next to it. That is to say the top of footing equals to top of insulation. In doing so, the concrete slap should then logicall be resting on the top of footing. Currently, the insulation sits on the top of the footing which forces the stem wall height to increase by the thickness insulation layer. I would think it is not a big deal since all the relevant interior room wall heights and clearances would be account for with the taller stem wall. However, a higher stem wall increases the materials list concrete calc and building permits can not be submitted with stem walls taller than 10' without additional engineering certication. This situation causes the stem wall to be 10' 2". This background on why I am asking for a solution that keeps stem wall at 10' while having interior wall height and clearances the same with 2 inch foam layer in the floor structure. Any further ideas would be appreciated. Link to comment Share on other sites More sharing options...
robdyck Posted August 4, 2021 Share Posted August 4, 2021 1 hour ago, Camerops said: The impression I have from looking at the room specification panel's elevation diagram is the insulation is sitting on the footing. I want it to sit next to it. That is to say the top of footing equals to top of insulation. In doing so, the concrete slap should then logicall be resting on the top of footing. Currently, the insulation sits on the top of the footing which forces the stem wall height to increase by the thickness insulation layer. I would think it is not a big deal since all the relevant interior room wall heights and clearances would be account for with the taller stem wall. However, a higher stem wall increases the materials list concrete calc and building permits can not be submitted with stem walls taller than 10' without additional engineering certication. This situation causes the stem wall to be 10' 2". This background on why I am asking for a solution that keeps stem wall at 10' while having interior wall height and clearances the same with 2 inch foam layer in the floor structure. Any further ideas would be appreciated. There is no way to do it automatically. You can set the rig. ins. to be in the floor structure then manually drag the bottom of fdn. walls up to u/s of slab OR you can manually create the insulation using the slab tools. Link to comment Share on other sites More sharing options...
Kbird1 Posted August 4, 2021 Share Posted August 4, 2021 Post a small Test Plan so others can have a "play" and see if they can give you some advice, and screen-grabs ( pics) help too , to explain the issues, but I think manually is the only way *BTW I believe you mean RIGID Insulation not Ridged Insulation at least I am not familiar with ridged insulation. Link to comment Share on other sites More sharing options...
Alaskan_Son Posted August 4, 2021 Share Posted August 4, 2021 Not possible using the room definition as others have stated. The room definition stops at the bottom of wall/top of footing and none of the room settings will affect anything lower than that. Very easy to model manually though. Link to comment Share on other sites More sharing options...
robdyck Posted August 4, 2021 Share Posted August 4, 2021 Further to this topic, it may be worth noting that adding under-slab rigid insulation that does NOT cover the footing (and provide a thermal break around the slab perimeter) would generally speaking not be considered good building practice as it misses the point of continuity of insulation by a painfully small margin and in some regions would not be compliant with building codes. Link to comment Share on other sites More sharing options...
GeneDavis Posted August 4, 2021 Share Posted August 4, 2021 We build here with the foamboard atop the footing. Why would one do it otherwise? Link to comment Share on other sites More sharing options...
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