tscalfa

Here are a few more details, see the attachments for diagrams. A few points to note: The floor area is 6 x 6.5m The garage is 0.5m below the ground level at the house it is attached to due to the sloping drive. Thanks again in advance for any advice. PLAN FLOOR.pdf SIDE VIEW.pdf

Thanks Gus, I'll get some more information/diagrams together and then share them on here.

If I go for an insulated slab I'm considering Cellcore HX plus where the insulation is included with the as part of the void former. Definitely haven't got a money tree unfortunately.... There is a slight slope to the site worst case around 1:6 gradient. I did have some initial consultations with a structural engineer and now I'm trying to understand the correct way to detail the job but I might ask if there's another way of doing it based on what you've suggested.

I can see why the 2nd one would be easier but I've seen conflicting information on whether the slab needs to be tied in to the ring beam or not.

Yes that's a good point about the DPM needing to go above the cellcore. With it being a garage floor I'm not planning to have a layer of screed particularly as the floor will have point loads from trolley jacks etc. You can get cellcore with a layer of insulation though so I may still be able to have an insulated floor. Is your slab tied in to the ring beam or does it just rest on top of it?

Hi everyone, I'm after a bit of advice please. I'm having an attached garage built which due to the ground conditions and proximity to conifers means I've got to have a pile reinforced slab. What is the standard practice for the damp proof membrane, should it go under both the slab and the ring beam as shown by the red line in diagram 1, or should it go between the slab and ring beam as per the red line diagram 2, or is there a third way it should be done? Does the ring beam need to be tied in to the suspended slab as per diagram 1 or is the slab just sandwiched in to the inner leaf in a similar way to a block and beam floor as per diagram 2?