Plastic should be placed under a concrete slab to protect it from moisture damage. Moisture from soil can penetrate the concrete causing it to crack with time and potentially risking lots of structural damage. A vapour barrier put under a concrete slab such as plastic sheets can protect it from this.
Why Put Plastic Under Concrete?
Using plastic sheeting when pouring concrete can greatly increase the durability of the concrete and reduce potential cracking and settling. On the surface, this may not seem necessary and could be considered as an added expense, but in the long run, it can save money in the future and increase the lifetime of your concrete installation. Installing plastic sheeting under concrete can provide many advantages, including:
1. Reducing Cracking
Concrete is a durable material, but it can be prone to cracking developing in it over time. This is due to the reality of shifting and settling, combined with the expansion and contraction caused by varying temperatures. By applying a plastic sheeting layer underneath the concrete slab, you are creating a barrier that can help to reduce the chances of cracking and settling developing on the surface.
2. Protects Against Moisture
Along with temperature extremes, changes in moisture levels can play an important role in the deterioration of concrete. Moisture can enter concrete through the soil below, and if not regulated, can cause serious problems with time. By inserting a layer of plastic sheeting underneath the concrete, you are creating a barrier against water seeping through the ground and into the slab. This can help to ensure that your concrete remains