do you need plastic under concrete driveway
Whether you pour concrete for a walkway or patio a strong gravel base is required to prevent the concrete from cracking and shifting. It could protect the concrete from freeze-thaw damage by reducing the amount of water it absorbs from the wet subgrade.
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You dont need a vapour membrane under a shed concrete slab but it is still a good idea to install one.
. Many moisture problems associated with interior concrete floors and slabs on grade can. Recently though research has shown that the old traditional layer of 6-mil Visqueen polyethylene plastic under the slab is seldom effective for two main reasons. As Mudd said if there is no barrier eventually the concrete will eat away at the plastic piping and cause it to leak.
Ive been requesting black plastic underneath to slow down curing but the latest contractor says that you want the concrete to dry out quicker and that the plastic causes a blotchy result. Next the seams between any slabs and structures will be sealed off with tape. Others see vapor barriers as essential and argue that they prevent adhesive failures retard the growth of mold and mildew and even prevent certain noxious gasses from entering a building.
A blinding layer under concrete is always a good idea it will stop draining moisture from your mix plastic works fine for this is you want to erect your reinforcement on the blinding consider using a concrete blinding layer of at least 50 mm. Gday Im getting quotes to remove some kerbing and lay an exposed aggregate concrete driveway layback up to the property line 14sqm in all. This is an effective vapor retarder in and of itself.
However you should definitely put some sort of barrier between any plastic piping used in the plumbing for example and the concrete slab or any other concrete. Gravel is especially important in clay soil because it doesnt drain well which results in water pooling under the concrete slab and slowly eroding the soil as it finally drains. I think the extra cost of the foam could be diverted to thicker concrete for a longer lasting driveway.
Ensure the vapor barrier is above both the gravel and rigid foam and immediately below the slab. It is still a good idea to have protection against rising damp even though you dont strictly need it. Permeance of 07.
True moisture or vapor barriers have a permeance of 000 Perms. Lives in Canada. If youre in a cold climate and the subgrade soil is poorly drained a vapor barrier might be marginally useful.
One contractor says to put plastic under the concrete it prevents moisture from coming up into the concrete. But it might be. Yes you should put a vapor barrier under concrete slabs to prevent moisture from wicking up into the slab and onto the surface of your concrete slab patio or driveway.
Although it may seem water-tight this grade of material allows a lot of water vapor to pass. The first step will be to prep the driveway or patio to make sure the concrete is in good enough condition for a seal. In fact most professional shed slab builders will install a polyethylene membrane under a shed concrete slab even if it is not specified.
Vapor retarders have been used since the 1950s. American Concrete Institute or AIC says that 10-mil poly or plastic with a 003 Perms IMP score is the lowest barrier you should put down under residential concrete. Concrete is an amazing value considering 70 will buy a cubic yard of plastic material than can be formed and molded into any shape that will last for a hundred years if done properly.
Any cracks may need to be filled in and any uneven slabs will need to be leveled back into place. The permeable nature of concrete allows ground moisture to penetrate upward to flooring or anything in contact with the concrete. A concrete vapor barrier is simply a sheet of polyethylene plastic Visqueen placed directly on top of the sub-grade before the concrete floor or slab is poured to help keep moisture from the soil from passing up through the concrete.
In temperate climates we see no advantage to placing a vapor retarder beneath a sidewalk. Also to know is should I put plastic under my concrete slab. Like 15-mil and 20-mil thicker poly barriers are often less absorbent and durable.
The other contractor says NO Way No plastic holds the water in the concrete during the drying process and can leave webbing like visual affect in finish of concrete. A common practice is to use a thin layer of polyethylene plastic sheeting as a vapor barrier. Does it make sense to omit the poly layer if you are planning to put a vapor barrier above the slab such as an epoxy sealer.
Icebergs now that is a thin mix. Some think vapor barriers can cause slabs to curl and that simply pouring concrete directly onto a granular base gravel crushed rock etc should be enough.
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