How to set up lighthouses?
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In the case when during the repair it becomes necessary to level the floor surface, a concrete screed is made on the floor. To make the screed perfectly flat, concrete is poured onto the floor, focusing on previously exposed beacons.
The meaning of laying screed on beacons is that the entire surface of the floor with this method of pouring concrete is divided in parallel laid beacons into separate rectangular sections. In addition, each beacon, which is a perforated aluminum or steel profile, is installed on the floor horizontally.
In addition, the lighthouses are set up in such a way that their crests are located in a single plane. As a result of this installation, beacons can achieve a perfectly flat and horizontal surface of the screed. To do this, the concrete is poured into separate sections and leveled by its long rule, sliding it along two adjacent lighthouses, as if on rails.
How to set the beacons to tie the floor
Tools and materials
- Lighthouses - long T-shaped metal profiles
- Construction pencil
- Long spirit building level ruler
- A string of thin cord
- Putty knife
- Construction mixer
- Bucket for the preparation of the installation solution
- Dry cement mix packaging, for example Ceresit CN83
It is necessary to install lighthouses on a previously prepared concrete floor (thoroughly cleaned, primed, with a laid waterproofing). First of all, you need to mark the level of the future screed on all the walls of the room.
Layout screed level
- To do this, draw a vertical line on any wall with a plumb line, measure exactly one meter from the floor along this line and place it at risk.
- Attach a building level ruler to risk, set it horizontally and draw a line through the risk.
- Gradually moving the level and constantly controlling its horizontal position, continue this line around the perimeter of the room.
- Measure the distance from this baseline to the floor. Take measurements in the corners of the room and in three or four places on each wall. Because of the unevenness of the floor, these measurements must differ - in some places the distance will be slightly more than one meter, in others a little less.
- Find the point at which this distance will be minimal (say, 95 cm) - this will be the highest point of your floor.
- The thickness of the concrete on the floor should be at least 3 cm, so in order to properly mark the level of the screed, you need to subtract these three centimeters from the minimum indicator (for example: 95 - 3 = 92 cm).
- Take a tape measure and in the corner of the room set aside the resulting difference (92 cm) from the base horizontal line vertically down. Put in the right place at risk and further, moving around the perimeter of the room, at small intervals make the same marks on all walls and in all other corners.
- Using a long ruler, connect all these points marked along the floor with a single horizontal line. The resulting dash will indicate the level of the screed.
Installation of beacons
Beacons should be installed parallel to each other, in the direction perpendicular to the wall in which there is an exit from the room.
The first and last beacon should be installed at a distance of 20-35 cm from the walls, the distance between adjacent beacons should be 20 cm less than the length of the rule. Professionals argue that the optimal distance between two adjacent lighthouses should be 70-120 cm.
- On opposite walls, measure from the corners, say, 25 cm each - these will be the points of installation of the outermost beacons.
- The remaining distance between them is divided into equal intervals so that their value falls within the above desired range (70-100 cm).
- Marked on opposite walls, the risks will show you where to put all the other beacons.
- For convenience, draw on the floor installation lines of all the beacons.
- Using a hacksaw, cut the required number of beacons of the required length.
- Shut up a small portion of the mounting cement - use a mixer to knead Ceresit CN83 according to the instructions.
- Each beacon set as follows. On the line marked on the floor, make a chain of lumps of mounting cement. Lay out the cement with a small trowel: one slap of the trowel - one lump of cement. The first and last lump should be placed close to the wall, the distance between adjacent lumps should be about half a meter.
- Place the lighthouse on the cement lumps with the comb up.
- Press the lighthouse into cement in both walls so that the top of its ridge exactly coincides with the level line of the screed.
- Now, by building level, check the horizontal position of the lighthouse along its entire length.Move the level along the rail and in the right places press it into the cement, or, conversely, raise it a little.
- Similarly install all the other beacons.
After the cement finally hardens, concrete can be poured between the lighthouses.
How to put the lighthouses under the plaster
Lighthouses under the plaster of the walls are exposed according to the same principle as the lighthouses under the floor screed. However, this work still has some differences.
- To install beacons, vertical markings are applied to the wall (the verticality of the lines is controlled by a plumb line).
- Extreme lines mark at a distance of 20 cm from the corners, the size of the gaps between adjacent parallel lines should be equal to the same 70-100 cm.
- First, extreme beacons are fastened to the walls with cement mixture (lumps of cement are applied to the walls at smaller intervals than on the floors) and level them using a level or plumb line.
- Then to the end walls with dowels attach several parallel horizontal rows of a taut cord. The cord is fixed in such a way that it touches the profile ridges.
- All other lighthouses according to the previously applied markings are fixed on the walls with the help of cement and level them, guided by the tensioned cords. Additionally, the correctness of their installation is controlled by the same plumb line.