Home Improvement

Preparation of concrete floors before laying materials

Preparing the concrete floor before laying and repairing the floor with thin floor repair cement.

Behind the installation of beautiful materials Is to prepare the concrete floor before laying the floor material to be smooth, strong, and have a consistent level, which will help to easily install the floor material. reduce problems There are also innovations in repairing concrete surfaces. With thin floor repair cement that is easy to work with and does not require tape to support thick floors to lose the original floor level. It is suitable for both new build houses and old house renovation work.

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Preparing the floor for real wood flooring

Real wood flooring in the interior By placing hardwood joists with a cross section of 1½ x 1½ inches   attached to the structural floor. Then pour the leveling sand mortar, polish the surface, level the wood joist surface, and then lay the wooden floor with the fastened joist.

Real wood flooring outside paved with grooves A steel joist or hardwood joist, measuring 2 x 4 inches, is placed on a cement base that floats above the polished structural floor. Adjust the slope for drainage. The bottom should be at least 5 cm above the cement surface to prevent moisture and not block the drainage.

Preparing the floor for paving stones and tiles

installation using sand mortar Used for areas that have not been leveled. with an allowance for the thickness of cement-sand pouring 3-5 cm (excluding the thickness of the floor covering)

Installation using cement glue It’s a more convenient, faster, more standardized method. Suitable for already leveled areas. By allowing the thickness of the cement glue 3-10 mm (excluding the thickness of the floor covering) depending on the size and material used.

Preparing the floor for the finished floor material

installation with glue Self-adhesive floor materials such as parquet, tile, vinyl, carpet are installed directly on concrete. Therefore, the cement and sand must be leveled to make it smooth. The surface difference should not exceed 3 millimeters.

Installation on sheet materials such as prefabricated wood floors laminate flooring by pouring leveling sand mortar Polished surface and covered with a flat sheet material approximately 10 mm thick, such as rubber veneer. fiber cement board and then backed with foam sheets before laying the floor material over internal floor leveling before laying lightweight floor materials

If using lightweight flooring materials such as parquet  , laminate or vinyl tile. It is recommended to adjust the thin surface to be smooth, without embossing.

Making process

  1. Prepare the surface to be clean and free from dust. Then apply a primer for Mortar leveling with a nylon brush. Leave it for at least 3 hours (but not more than 24 hours).
  2. Pour the level with flowing type floor leveling mortar. to get a thickness or level required from 1 – 40 millimeters in case of thin skin adjustment The floor material can be paved after 16 hours of leveling (if you want to level the level at 40 – 125 mm. thickness, you can mix more gravel. to strengthen)

Adjusting the floor before laying tiles or heavy materials

It is recommended to level with leveling mortar. By pouring with a thickness of at least 3 centimeters to support the weight and pressure well. The level should be determined by stretching the tendon. or laser level to the desired level In particular, making the floor slope to drain water such as decks, bathrooms or parking lots, and if it is an area at risk of water seeping Either from groundwater or water from above  Waterproofing cement should be applied to protect the area before the problem occurs.

Repairing cracks in exterior floors

External concrete floors and parking lots with cracks from leveling mortar This may cause problems from the formation of small cracks on the surface (Hair crack), cracks that are not caused by the structure. or cracks that have stopped or unexpected accidents such as heavy traffic areas with cracks, which can be fixed as follows

– If cracks occur on the surface Does not affect the structure of the whole sheet of cement Can be repaired with ready-made cement for floor repairing and resurfacing of thin concrete. The cement can repair the floor as thin as 1-2 mm. The area can be opened 1 day after work and the car can pass through 3 days after work.

– If the crack is deep in the cement or plaster Should check whether there is a cause of subsidence of the front of the house or structure as well. If there is no structural cause It is recommended to extract along the cracks. To have a width of about 1 – 2 centimeters and repair the cracks with structural repair cement. The surface is then repaired with ready-made cement for floor repair and thin concrete resurfacing.

Dusty surface problem

If the surface deteriorates  looks like dust Can be repaired with ready-made cement for floor repair work. and can adjust some types of concrete surface  

If the mortar is partially peeled off and a wide area Rough surfaces can be repaired to a depth of 2-10 mm with ready-made cement for repair work. Before smoothing the surface with ready-made cement For floor repairing and adjusting thin concrete to 1-2 mm thick. Another layer.

Small holes (not more than 40 mm deep)

If the hole is deep in the cement or plaster If checked, it doesn’t affect the structure. It is recommended to smooth out the holes with Structural Repair Cement. Then, the thin surface of 1 – 2 mm is then repaired with ready-made cement for the floor repair and resurfacing of thin concrete.

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