Cement- sand screed floor with their hands

use of cement-sand screed is one of the most popular ways of leveling the floor in the room.However, it is best to use only on solid ceilings that can withstand heavy weight design.

Cement-sand screed

Screed sand and cement is the most heavy-handed method of floor leveling.With a thickness of 1 centimeter of its weight per square meter is 20 kilograms.When using concrete with light fillers and special rovniteley weight per square meter of screed can be reduced up to 16 kilograms.Please note that the minimum height of the screed sand and cement must be at least 3 centimeters, otherwise it will start to crack and crumble.

Advantages and disadvantages of the screed sand and cement screeds

device out of the sand and cement involves the use of water for its establishment, which dictates the need for surface waterproofing.The advantage of this method is a floor leveling high durability and long service life, net - heavy weight design.

Prepare surface

1. To start forming ties of sand and cement - floor surface must be initially primed.Using the primer composition should improve grip ties with the leveling surface.The fact that they can move, and a lack of quality can damage the clutch operation at the lower layers of dry screed.
2. Next inspect the leveling surface.Since it is necessary to remove the exposed portions, for example iron armature ends used to form slabs.
3. rattles hammer the entire surface of the prepared floor, remove the exfoliated areas, and you can use a special grinding machine.
4. Thoroughly clean the foundation of dust being prepared - walk with a broom and then vacuum.
5. treated soil solution completely level and large potholes and technological hole at the plate.
   

   produce priming floor

6. Prime with the surface of the solution used for processing materials with high porosity.Apply two coats of primer, the second after the complete drying of the first.
7. After drying the primer start to lay a special damping tape along the walls of the room.It serves three purposes:
8. • To protect screed array at the junction to the walls of the room from damage caused by thermal deformation,
   • To seal the premises in the joints of plates.These may be slit into which seeps water used for the manufacture of ties of cement and sand.
   • To protect the screed from the damage caused by the presence of horizontal stress when it dries.

marking level of cement-sand screed

required level at which you plan to raise the floor using a screed of cement and sand is necessary to identify by means of a laser level.When calculating the necessary lift height, do not forget that the minimum height of this type of screed must be 3 centimeters.A laser level is set to the surface and then an ordinary pencil, mark the position of the laser beam on the walls of the room.Using the laser level allows you to put a mark on the walls, even without resorting to the use of otbivochnogo cord.

step instructions for building a cement-sand screed

First of all, you must take into account that form a screed of cement and sand is necessary for a positive ambient temperature of not less than 5 degrees.

The first phase established beacons.Their upper edge should be flush with the wall markings printed on the planned level of the screed.For the manufacture of beacons using special rail or conventional metal profiles to create false ceilings.The distance between the beacons should be less than that used for leveling screeds normally also located at a distance of one and a half meters from each other.

Set beacons of metal profile

As bases, fixing rails beacons to the base is a mixture of sand and cement in a ratio of 3 to 1, and it is advisable to use the "400" brand cement.Alternatively, you can use a mixture of plaster mixture, diluted for consistency "thick cream".

initially exposed lighthouses near the walls of the room, their level shall be verified at the marks on the walls.After fixation between them tensioned strong thread, on which further vystanavlivayutsya beacons intermediate rail.

Check lighthouses strain, they should not sag.Upon detection of such defects fix sagging seats with additional supports - piles of cement-sand mixture.

Spend waterproofing surface.For this meta plates and joints yield utilities must be closed with a film of polyethylene.You can close the entire surface of the film as a whole, fastened portions of the web material by means of an adhesive tape.

Wait for a solid fixation of Lighthouse slats on the surface.This solution dry weight of not less than one and a half hours.

Prepare the solution for the formation of the cement-sand mixture.The ratio of cement and sand, take 3 to 1, use the "400" brand cement.

Knead solution ties.This can be done in a special container, and just on the floor.On a sheet of metal roll in the sand, and then cement, move the ingredients and form a hill with a crater, like a volcano and into the recess on the top of the heap pour water.Gradually knead the whole mass of the prepared, starting from the top.The prepared solution should stand for about quarter of an hour.

Nuisance solution for floor screed

Liberally moisten the entire floor section intended for this party solution vodoy.Lopatoy move the prepared solution in the space between the rails majachnye.

overlay mass align with the rules by moving in the direction of the excess solution, where the amount is less.

start leveling floor

consistently perform grouting all tie bars, moving from one rack to another lighthouse, from a remote part of the room and headed for the exit.

Cover tie-drenched film of polyethylene and leave in this state for 12 hours.

After the initial curing knock sturdy spatula identified mounds.The entire surface of the screed treat float of wood, trying to obtain a homogeneous rough surface.

Proceed to grout smoothed surface."One to one" To do this, prepare a solution of the sand and cement brand "400" in the ratio.During the grouting surface moisten it with water from an ordinary household spray.

If you were Lighthouse slats limiting leveling surface - remove them at this stage, and then fill the void leveling mortar.

Leave the tie formed from sand and cement for drying.Full hardening thus made tie occurs within 28 days.

When drying screed can not prevent occurrence of drafts.You should also take care of the fresh screed from direct UV rays.If the room is too hot, then at the initial stage of drying screed is necessary for a day to cover a film of polyethylene.Also, in hot weather it is recommended twice a day to wet the tie fresh water.

Video - Cement-sand screed floor with their hands