We poured a concrete slab with Alba lecabeams as edge reinforcement, reinforced, insulated, etc. For now, we will only use it for a carport with storage, but the idea is that in the future we might build a garage or guest house on the slab instead.
For various reasons, we didn't embed the steel angle that is supposed to protect the edge (it's just leca just below the concrete surface, 200 mm into the slab all around). Now I have received a 3.5-meter long angle iron (to cover the short side where the car drives in), which is 200mm on one side to cover the leca's width, and 150 mm on the other side. 4mm thick.
I thought of laying it down, filling up with bearing layers/concrete/stone dust outside (there are screw holes, but it probably won't hold so well in the leca in the long term) to keep it in place.
The paving/landscapers that were at home, however, suggested that we should apply a strip of PL400 under the edge, against the slab, to prevent snow/moisture from getting in, which could then freeze and damage the leca under the steel edge.
Said and done. But it attached quite poorly in the cold and moisture, and if I stand on the slab, the iron bends down by a mm in some places (the length, weld seam, etc. means it can't lay perfectly against the concrete slab).
What's the best way to solve this? Lift the iron, bring it into the basement warmth overnight (though the concrete is still cold...) and use a more substantial adhesive strip. Or try applying a strip of construction sealant underneath. Or better to follow the principle of not trapping moisture with adhesive/sealant and hope that the ice expands outward? There's a roof over the whole structure, but snow can blow in, of course.
I don't want to chisel, mill, etc., into the new slab, and if you build a house on the slab, it's only good if the edge can easily be removed.
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For various reasons, we didn't embed the steel angle that is supposed to protect the edge (it's just leca just below the concrete surface, 200 mm into the slab all around). Now I have received a 3.5-meter long angle iron (to cover the short side where the car drives in), which is 200mm on one side to cover the leca's width, and 150 mm on the other side. 4mm thick.
I thought of laying it down, filling up with bearing layers/concrete/stone dust outside (there are screw holes, but it probably won't hold so well in the leca in the long term) to keep it in place.
The paving/landscapers that were at home, however, suggested that we should apply a strip of PL400 under the edge, against the slab, to prevent snow/moisture from getting in, which could then freeze and damage the leca under the steel edge.
Said and done. But it attached quite poorly in the cold and moisture, and if I stand on the slab, the iron bends down by a mm in some places (the length, weld seam, etc. means it can't lay perfectly against the concrete slab).
What's the best way to solve this? Lift the iron, bring it into the basement warmth overnight (though the concrete is still cold...) and use a more substantial adhesive strip. Or try applying a strip of construction sealant underneath. Or better to follow the principle of not trapping moisture with adhesive/sealant and hope that the ice expands outward? There's a roof over the whole structure, but snow can blow in, of course.
I don't want to chisel, mill, etc., into the new slab, and if you build a house on the slab, it's only good if the edge can easily be removed.
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But the slab is already cast with a straight and nice edge. I need to mount the angle iron afterwards. There were no problems and it will sit firmly now that it is backfilled. The problem (if it is a problem) is that water can get in between the concrete slab and the iron, and possibly cause frost heave underneath.
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