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Internal room slab - is a filler needed round the perimeter?

Crunchynut
in Brick & Block

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I’m laying a new slab in a house. Slab is straight onto  sub-base and will have DPM and insulation on top. When casting the slab can I run the concrete right up to the perimeter brickwork or is a filler required to provide isolation between slab and wall? If so, what is the best product? 

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