Replies

1. 
   Lee Newton|Sep 06, 2019 09:40pm|#1

   A typical spread footing is either prescribed in terms of depth and width by the building code or specified by an engineer. There are minimums with respect to footing projections beyond the width of the wall, etc. That said, I would think that there would be an inordinate amount of waste - or having to pour a wider wall than necessary - to satisfy structural needs. Perhaps check out a company such as Dorken and learn about products to provide capillary breaks and methods to water seal this junction.

2. Expert Member
   Malcolm Taylor|Sep 06, 2019 10:31pm|#2

   Scott,

   I pour almost every foundation monolithically - not in ICF though. The benefits are time, having only one delivery charge for the concrete and pumper truck, and the strength of the foundation. The downside is you can't install a capillary-break.

   I'm not sure the cold-joint between a footing and foundation poured separately is that big a deal. It's above the level of the perimeter-drain and below the level of the slab. In any case, we have 1"x4"s across the top of the footing forms, to support the cribbing for the walls, that stay in place afterwards. So in terms of penetrations from inside to out they are probably more significant.

   Edit: I though you were using a sort of space-frame pre-fab metal foundation?

1. 
   Jamie B|Sep 07, 2019 05:18pm|#3

   I did one a while ago. Just a wood form, looked like an upside down T. Placed poly at the bottom on the soil to act as a capillary break (not exactly undisturbed soil) After the forms were stripped the excess "flaps" of the poly were tied to the interior subslab poly and the exterior foundation waterproofing.

   Turned out alright... so far. No catastrophic failure yet.

   Jamie

3. 
   Scott Wilson|Sep 07, 2019 06:12pm|#4

   Malcolm, my preference is for the Multipoint metal frame foundation, mostly due to the fact that a concrete truck shouldn't be able to get in to the site. Now I'm told that "maybe" one can. That and a friend pestering me endlessly into considering a full basement made me think that I should at least look at the options. I really don't want to use that much concrete, not even for piers.

   Still, the monopour is an interesting variable. I wonder how they include sub-slab insulation?

1. Expert Member
   Malcolm Taylor|Sep 07, 2019 08:03pm|#5

   Scott,

   Monolithic or separate pour, don't you end up with the same footing and walls? The sub-slab insulation would be placed on fill inside the foundation as usual.