- 1 When should you float concrete?
- 2 What is a floating concrete slab?
- 3 What is the purpose of a floating slab?
- 4 Do you need to float concrete?
- 5 What is the difference between a trowel and a float?
- 6 How long after pouring concrete can you power float it?
- 7 Does a floating slab have footings?
- 8 Can you waterproof a basement with a floating slab?
- 9 What is a floating garage?
- 10 How do floating foundations work?
- 11 What is a monolithic concrete slab?
- 12 How do you build a slab-on-grade?
- 13 What does a magnesium float do to concrete?
- 14 What defects can be caused by bull floating too soon?
- 15 What happens if it rains on fresh concrete?
When should you float concrete?
Float the concrete when you ‘re done grooving and edging (Photo 6). Floating removes the marks left by edging and brings the surface one step closer to a final finish. You may have to bear down on the float if the concrete is starting to harden.
What is a floating concrete slab?
The term floating slab refers to a two-stage slab construction, where footings are individually. poured, and the centre floor of the slab is poured after footings have cured. The forms of a monolithic slab are designed so that both footing and slab floor are poured at the same time.
What is the purpose of a floating slab?
Floating slabs behave as a barrier for the entrance of the moisture coming from the ground. It acts a barrier between the superstructure and the ground. This avoids seepage of water and frosting. For this purpose, the slab can be insulated for frost or moisture.
Do you need to float concrete?
Floating has to be done on virtually every concrete job after concrete is poured and leveled. (Leveling is usually accomplished with a screed.) When done properly, floating pushes the aggregate down into the concrete and encourages moisture to rise, helping the concrete dry and creating a smoother surface.
What is the difference between a trowel and a float?
A float has a thicker base than a trowel and is usually made of plastic, sponge, rubber, wood or magnesium – a lightweight pale grey metal. It’s used to even up the surface on plaster or concrete, make it firmer and give whatever texture is required.
How long after pouring concrete can you power float it?
Allow all of the water to disappear before you do anything else. This can take 20 minutes or 4 hours depending on the temperature, humidity and how hard the wind is blowing.
Does a floating slab have footings?
Answer: A floating slab foundation is a foundation which doesn’t have concrete footings. This allows for the garage floor to just be poured over gravel and the existing ground.
Can you waterproof a basement with a floating slab?
The use of floating slabs for basement floors is common in modern homes today. You can help eliminate moisture problems by waterproofing the floating slab along with the subterranean basement walls. Look for holes or cracks in the floating slab that you want to waterproof.
What is a floating garage?
What is a floating slab? A floating slab is a concrete slab foundation on which a structure is built. A floating slab does not have frost protected footing and is designed to “ float ” with the ground during the winter months. Floating slabs are most commonly used when building a detached garage or shed.
How do floating foundations work?
A floating foundation consists of boxlike rigid structures set at such a depth below ground that the weight of the soil removed to place it equals the weight of the building; thus, once the building is completed, the soil under it will bear the same weight…
What is a monolithic concrete slab?
Monolithic means “all in one pour” so the foundation is constructed in one single pour that is made up of a concrete slab with thicker areas under load bearing walls and all perimeter edges to take the place of footers. Because this Slab is poured all at once, it is much faster and keeps labor costs low.
How do you build a slab-on-grade?
Slab-on-grade foundations forgo the basement foundation, and instead pour a simple concrete pad on top of a soil substrate, and build the structure on top.
What does a magnesium float do to concrete?
Magnesium smooths the surface of fresh concrete and opens the pores for proper evaporation, all without pulling the surface like a wood or resin tool. Most magnesium floats are extruded or cast. Molten magnesium can be cast into any shape desired.
What defects can be caused by bull floating too soon?
More often, premature finishing or improper first ( bull floating ) or second floating results in trapping rising bleed water and air below the top surface of the concrete (Image 2). When this occurs, the resulting weak or soft zone below the surface causes the top surface of the concrete to flake or scale off.
What happens if it rains on fresh concrete?
HOW DOES RAIN AFFECT CONCRETE? Rain falling on top of freshly laid concrete can damage the surface and compromise a level and floated finish. Even worse, if too much extra water works its way into the concrete mix, this can result in weak concrete overall.