Hi,
Ground Floor extension 6x6mt, render finish.
Not sure if walls will be block cavity or solid block at this stage.
Should the floor slab go in before the walls go up from DPC level, or after ?
Contractor will lay the footings and blocks, I will be laying the slab.
One method I observe is to run your visqueen (or other 100 gauge) DPM over your wackered and blinded MOT, then up and over the footing blocks, an additional harder wearing textured DPC on a roll - is either on top of, or under that DPM, and if a cavity is present - a tray is created, the concrete slab is poured - and using the raised blocks with DPC and DPM sitting ontop as a level, the slab tamped down. Block laying then continues up from there.
This creates a seamless DPC without any joins or overlaps, apart from where any cavity may be present.
I have a block layer suggesting that blocks go all the way up in one go, the slab then goes in after ... presume I would then have to 'glue' the latterly installed DPM to the stiff DPC plastic that I presume would be left jutting out 100mm or so at DPC level.
Putting the slab in before walls go up is easier for me, but involves block layer having to do the job in two parts. If I have to do it after, leveling will be bit more of a circus, and unsure how to join/glue the overlap between the DPM and stiff DPC.
Any thoughts appreciated.
Ground Floor extension 6x6mt, render finish.
Not sure if walls will be block cavity or solid block at this stage.
Should the floor slab go in before the walls go up from DPC level, or after ?
Contractor will lay the footings and blocks, I will be laying the slab.
One method I observe is to run your visqueen (or other 100 gauge) DPM over your wackered and blinded MOT, then up and over the footing blocks, an additional harder wearing textured DPC on a roll - is either on top of, or under that DPM, and if a cavity is present - a tray is created, the concrete slab is poured - and using the raised blocks with DPC and DPM sitting ontop as a level, the slab tamped down. Block laying then continues up from there.
This creates a seamless DPC without any joins or overlaps, apart from where any cavity may be present.
I have a block layer suggesting that blocks go all the way up in one go, the slab then goes in after ... presume I would then have to 'glue' the latterly installed DPM to the stiff DPC plastic that I presume would be left jutting out 100mm or so at DPC level.
Putting the slab in before walls go up is easier for me, but involves block layer having to do the job in two parts. If I have to do it after, leveling will be bit more of a circus, and unsure how to join/glue the overlap between the DPM and stiff DPC.
Any thoughts appreciated.
Last edited: