AliG

DPC on Kore foundation

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Hi,

 

We are waiting to hear back from MBC, but thought I would enquire to see if anyone has this foundation build up.

 

We are using the MBC/Kore passive foundation. But we want the slab level to be at ground level which makes access much easier.

 

The drawings we have at the moment do not show a DPC and there is no standard drawing from Kore for this.

 

Does anyone have a ground level EPS slab with timber frame and if so what detail was used for the DPC?

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On our MBC raft foundation, the DPC goes on top of the lowest 100mm layer (of three) of EPS, and then up and over the upstands. 

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Thanks @jack for some reason it wasn't shown on the foundation drawings and it might all be sorted once we speak to them.

 

Are your upstands above ground level?

 

We have basically this build, but our footpath level is level with the slab.

 

image.thumb.png.0f7457203bd91a7cd88ad2bef485ac92.png

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Yes, the upstands are above ground level.

 

Here's the equivalent detail for ours - you can see the radon barrier, although its path isn't that clear (sorry for the resolution - this is all we were given):

 

image.png.bad81b5e1b031f114f08640046b740c2.png

 

Pretty-well matches what you've posted above, although our DPM/radon barrier as installed continues down the outside edge of the upstand most of the way to the bottom edge, from memory.

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1 hour ago, AliG said:

We have basically this build, but our footpath level is level with the slab.

Ali,

The Radon/DPM (Damp Proof Membrane) shown in blue on your diagram is, I believe, the DPC (Damp Proof Course) you referred to in your original post

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4 minutes ago, BotusBuild said:

The Radon/DPM (Damp Proof Membrane) shown in blue on your diagram is, I believe, the DPC (Damp Proof Course) you referred to in your original post

 

I think that diagram is just one he's found elsewhere, rather than being related to his plans.

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Agreed Jack. Just pointing out the wonders of acronyms and the different names we have to put up with deciphering 🙂  (and I thought the IT industry was bad!!)

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Yes, I just found this standard detail from the Kore website, it wasn't shown on our plans.

 

The house will differ in being at ground level, not 150mm above and we aren't sure if that causes an issue as normally a DPC would wrap over a brick in the external skin raising it off the ground, but we don't have a brick course.

 

 

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I brought my paving level with the slab at the front door and rear sliders so have no steps.

 

Ensure you have decent flashing at each threshold - ideally a lead detail that you can lap over the DPM that the door frame can sit on.

 

You've not said what exterior finish you are planning - if its render or similar cladding, you'll have an air gap at the bottom (protected with inset mesh) that you'll need to ensure is clear. 

 

Render also needs a clear 'splash zone' of 100-150mm below and in front to minimize staining and algae growth. We achieved this by stopping the paving 100mm from the render and having a french drain around the perimeter that stops 100m below the render base so plenty of room for airflow. You will also need to protect any exposed EPS up-stand from rodent attack (from where they could gain access to your internal insulated frame layer) so an aluminium or heavy duty PVC detail or something like Ubiflex will work.

 

Obviously if you're doing a brick or stone exterior, this will be sitting on its own foundation so no further protection needed.

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How are you going to prevent water bouncing up onto your external finish. 

The 150mm upstanding from ground level to external finishes has been around for years, and it works. 

In your part of the world I really think this is something to reconsider. 

 

You can have the front entry entry level but why the whole house. 

Definitely something I would re evaluate, you will get problems with snow blowing up and piling against your external finish.  

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Having a flush threshold all round can cause damp issues.  They are not so bad with doors / windows as they should not be affected but adjacent to walls will be no good.

 

The sole plates should be 150mm min, pref 225mm above DPC / ground level.

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does this help? not MBC foundation but designed by Tanners for a Kore system and a level threshold entrance.

 

679866294_Screenshot2021-02-22at18_49_21.thumb.png.b3512a67db0a8d5364f4fe0458ee4604.png

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16 hours ago, Russell griffiths said:

The 150mm upstanding from ground level to external finishes has been around for years, and it works. 

 

We are going to have an aluminium band around the bottom of the house with the render/renderboard above it So no render at ground level.

 

Our house is the same, the slab is at ground level, but we have a stone base course then the render above it.

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39 minutes ago, AliG said:

 

We are going to have an aluminium band around the bottom of the house with the render/renderboard above it So no render at ground level.

 

Our house is the same, the slab is at ground level, but we have a stone base course then the render above it.

 

Similar solution to what we done, a stainless steel band around the kore upstand, same stainless as used in roof.

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