I’ve dug our for a hot tub base in my garden, it weighs about 300kg plus water.
I’m going to line the hole with 4x1 but should I also be putting a DPM under the concrete or does it not need it with it being outside?
I’m going to line the hole with 4x1 but should I also be putting a DPM under the concrete or does it not need it with it being outside?