I thought about trying to paint a liquid DPM onto the brick before pouring the concrete in- but being only a thin gap, this would be very difficult.Īlso considered using silicon to fill the gap- but this will use a good 10 tubes + and the floor will not be solid at this point. But because we put doors and patio doors in we need to bridge that gap so we will it with. Given that this is only a couple of inches deep (although along about 5m of wall) should i just fill the gap back up with concrete and not worry about the potential for damp getting to the slab? Or is this a bad idea. The gap is where your cavity goes around your whole house. Therefore if i just fill the gap back in with concrete, it will be touching the brick that is below the wall's DPC.thus effectively connecting the slab to the damp side of the brickwork. Remove any porous material other than the soil in the gap. Old disintegrated asphalt saturated fiber boards can be the reason why the gap is more porous. ![]() I notice that the plastic DPM is doubled up/not pulled up properly to the top level of the slab. Step 1: Determine any material that makes the gap more porous. this has left a channel of about 1" wide all the way around the edge of the wall. A self-leveling grout is poured along the slab surface, where it begins to fill in the low portion of the floor and create a level surface. This trench should be as deep as the slabs are. Anything below 1/4 inch can be filled up directly with caulk. ![]() This can easily be done with a measuring tape or ruler. ![]() The first thing you need to do is measure exactly how big or small the gap is. I poked at it with a chisel and removed the loose material. Dig a 4-inch wide trench along the sides of the slabs from the crack or gap closest to the house all the way down to the street or sidewalk. Read on for a step-by-step guide on how you can fill gaps between a concrete slab. Fill large gaps or cracks in concrete to avoid damage to your slab. The screed and concrete around the edge of my concrete slab (where the slab meets the external cavity wall) was cracked.
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