cement screed applied for leveling the subfloor and the formation of a solid surface for paving.
According to Masters, cement-sand screed can be attributed almost the simplest kinds of finishing works (if at all).Before you answers to frequently asked questions about cemented floors.
- What tools may be needed for the device floor screed?
- Cement floor screed.Where to begin?
- How to layout the floor?
- What is permissible thickness of screed?
- What is better to strengthen the beacons?
- How to prepare the ground for pouring cement-sand mortar?
- Mortar screed: how to cook?What
- cement screed floor to use?Which is better for cement screed in the apartment?
- How dry cement?
- How much cement on the screed?What
- flow screed?
- What is the weight of the cement screed?
- How to fill the screed?
- As a "look" for the fresh screed?
- What is finishing screed?
- Cement screed: alternatives
- $ Cement floor screed: issue price
- $ average cost of materials
- $ average cost of hiring artists
What tools may be needed for the device floor screed?
- main instrument, the work that should be given more attention - building level.How to set the level, and so the floor in the end turn out;
Because when you buy this instrument do not spare funds: saving is not justified.
IMPORTANT!Use level flask ("bubble" building level) at the organization floor screed can be.This level of error (if the quality of the tool is not the Chinese) is only 0.5 mm per 1 meter, iewhen working in a room with a width of 5 m, the error will be only 2.5 mm.On the scale of the room is a minor blemish.Use
recommend a regular building level "Brigadier" (note the wide aluminum profile level).The cost of such an instrument rarely exceed 12-13 $, but in itself it is fully justified.
As for laser levels, do not rush to conclusions: yes, this technology has really improved and greatly facilitates the work.But laser level and also exhibited "on the bubble"!So that the degree of error in the laser is initially the same as the conventional construction level.
- evenness ties, in addition to level, will also depend on the correct installation beacons - galvanized profiles;
This is a reasonable replacement of wooden rails.
option arrangement beacon of cement-sand mortar is also possible, however, to a great extent hinders job: you at least two days prolong the process of floor screed.
- Another important tool - plastering trowel;
trowel to complete the work is done by sanding the floor defects.If such was not at hand, and you can use a trowel, but for beginners repair things more convenient to work it will float.
- rules are used for packing cement-sand mortar between beacons.
recommend aluminum rule this lightweight material is not afraid of moisture.On sale you can find such varieties of aluminum Regulations: rectangular profile, I-beams and complex profile.The best of them can only choose under your hand, as long as it was a smooth and durable tool.
Additionally you need to get:
- buckets for carrying solution;
- nylon thread for marking;
- 1 kg of plaster for fastening lighthouses.
Cement floor screed.Where to begin?
choice to we more or less sorted out.Getting Started.And we start with the floor layout.
How to layout the floor?
work on the screed usually starts demontazhstarogo covering - linoleum, tiles, or even a wooden base.After cleaning the floor of debris can be taken per level.
Determine the location of lighthouses and their necessary quantity.We recommend that you set the distance between beacons from 1 m to 1.5 m high.Cubs, with their hands equip tie, with the intermediate width will work easier.
IMPORTANT! The greater the distance between the beacons you set, the less time and energy will be spent on the preparatory stage.However, the chance to prevent the error in the width of 2 m is much greater.Alignment of marriage in the end will take longer than mount another intermediate beacon.
By marking the floor to understand the application of marks on the walls of the room, according to marks and beacons will be installed. important to make reference counting not on the level of the floor, and, focusing on the horizon (something your floor may be uneven).
randomly selected corner of the room, put a line on the wall at the intended level of floor screed.
And then you must be one more question:
What is the permissible thickness of screed?
cement screed thickness should be no more than 5 cm, the minimum layer thickness - 3 cm : With these parameters screed dries evenly, forming a solid coating.If you exceed the limit, the solution may dry unevenly, if you reduce the thickness - a layer of cracked cement, and will be useless.
return to the level mark on the wall ties.When choosing, consider the thickness of the screed as a final coating and height:
- tiles will need at least another is 15 mm floor height;
- laminate - about 10 mm;
- linoleum - an average of 5 mm.
To organize tie layer 7 cm or more is used for the strengthening of the solution - a special reinforcing mesh (as well as strengthening ties can be arranged fiber cement screed).At the height of the screed homes rarely exceed 5 cm mentioned.
of Fiber Using a builder's level, apply the vertical height of the sub-floor around the perimeter of the wall at the locations of the lighthouses.
What is better to strengthen the beacons?
To mount beacons useful solution alabaster.The cement-sand mortar, as we said above, hardens around 2 days, and alabaster harden in 15 minutes.
IMPORTANT! drying time alabaster novice may not be sufficient to properly set the lighthouse because kneading alabaster better portions and not to rush.For once enough and portions in 200
Fastening beacon to sweep the floor and moistened with water.
majachnye rails attach to the alabaster, one striking alabaster beacon with a pitch equal to the distance between the beacons.A more frequent fastening is not required - it is quite strong.Under beacons, however, can be in the place to put a trough stone or brick.
How to prepare the ground for pouring cement-sand mortar?
Preparation of the base will depend on its type.For example, for laying the screed on slabs or any other concrete base thoroughly sweep up dust and dirt. Rubbish important to clean to reduce the likelihood of cracking ties.
wooden structure must be closed as from moisture of cement-sand mortar: waterproofing should be put on the wooden floor (screed on the organization of such a floor - a separate issue, dismantling the old floor is obligatory!) And wooden door frames.
IMPORTANT! If a tie you're going to hide some of the communication, consult with a specialist about the correctness of the repair work.Because the hot water pipes are often subject to thermal expansion: in such cases, the stock adjustment is necessary for normal functioning of the system.
Mortar screed: how to cook?
composition of the solution must be selected on the basis of the features of the finishing flooring:
- composition for laminate floor, tile, flooring and other hard coatings: 1 share Cement PC-400 mixed with 5 sand-Tew shares and 0.7 sharewater;
- composition floor under soft floor coverings (linoleum, carpet): 1 share of the cement mix with 4 portions of sand and 0.7 share of water.
IMPORTANT!Screed frozen and cracks?The cause of cracking tie is often a surplus of water.Without need not increase its consumption.
TIP: To make a mobile solution, ie,more comfortable in use additives, plasticizers, for example, P-3.Do not try to mix the solution for the entire floor at the same time: simply do not have time to apply before curing.As is the case with alabaster, cement-sand mortar is better to speak in portions.What
cement screed floor to use?Which is better for cement screed in the apartment?
Cement M-200 is most often used for leveling floors in residential buildings (you can use the cement screed « UNIS Horizon » the brand of cement: screed is easily applied, does not shrink and does not crack or take cement screed TM « MAGMA »).
Cement M-300 is intended for the organization floor screed in public places: schools, shops, libraries, and so forth.
Cement M-400 - the basis for the concrete floor in public places with high intensity mechanical action on the surface of the floor.In contrast, the top two grades of cement, for solution of the M-400, you will need sifted sand and rock dust.
Technical characteristics of each brand must be specified by the manufacturer on the packaging - this module size and volume weight of the cement, and the filtration coefficient.
How dry cement?
the occurrence, but initially wrong: screed should not be dry, it should solidify.Solidification process lasts longer than drying surface and that it depends on long-term sex life.
For screed of the M-200 will dry up in 2-3 days, the screed of the M-300 and M-400 - 3-4, and in the solidification of the concrete should be given at least 28 days!Because many people choose dry screed with expanded clay, becausecement or concrete screed, according to the standards requires a considerable delay before finishing in the room.
How much cement on the screed?
In the calculations, it is important to know how much to cement on the screed.
Counting is simple:
Record necessary thickness of the screed (for example, 5 cm).
Record floor area of the room (for example, 12 m²).
consider the amount of floor screed, multiplying indicators of claim 1 and claim 2 (do not forget to bring the number to a single unit of measurement!):
12 x 0.05 = 0.6 (m³)
from the above described proportions of the ingredients of the solution to perform calculations screed: 0.6 m³ ties will one share of the cement and sand 4 share, ie0.15 cubic meters and 0.45 cubic meters of cement sand.The weight of an element can be calculated from a constant: the specific density of construction sand and cement registered in directories and free access is provided in the Internet.What
order not to confuse you arithmetic: the approximate consumption of materials for floor screed - for these 12 m² at a thickness of 5 cm screed, we need about 7 bags of cement (25 kg) and about 17 bags of river sand (50 kg).
What is the weight of the cement screed?
At arrangement cemented important to know how much you load the load-bearing structures house: screed - is not an easy thing.In some cases, the load commensurate with the possibilities of overlap, which can lead to a collapse.
Note that the total weight of the ingredients can not be considered the weight of the screed screed after it fills, becausepartially lose weight in the volume sealed and gaining weight due to air bubbles.For example, from 1 m³ dry mix as a result of having received only 0.7 m³.Therefore distinguish volumetric weight of the material and the specific gravity, in other words - the weight before and after mixing.
These numbers can be found relevant regulations SNIP and GOST.For example, according to GOST 8736-77 (Sand for construction works), sand initially weigh 1600 kg / m3, but its weight can vary between 1550 - 1700 kg / m³.
screed 5 mm thick, depending on what brand of cement and sand fraction used to weigh about 90 kg / m² (compare: dry screed with expanded clay, that is filling and not filling the floor weighs only 39 kg /m²!).
How to fill the screed?
Using a trowel, fill cement-sand mortar voids under beacons.
Apply the solution onto the floor, moving from the far corner of the room to the front door.
solution gradually fill the space between the beacons, if necessary, leveling the surface with a trowel.After laying a few square meters of surface leveling rule operate smoothly, but confident movements "left - right".
perfect surface with the first pass a rule, you will not be able to achieve, because the shell, and other minor irregularities on clean solidify ties plastering trowel or the same trowel.
IMPORTANT! When working, watch out for the level and horizontal ties.
This whole technology.Tightening device of cement for beginners, performing similar work with their own hands for the first time should take a little more time: prepare a solution in portions at a time, apply the solution onto the floor no more than 1.2-1.5 meters.
As a "look" for the fresh screed?
screed must solidify in a room without drafts and bright sunlight (uneven lighting of the room can lead to the same non-uniform solidification ties that will give a different shrinkage of the floor).After a day curing screed desirable cover with plastic film.
tiles on the screed is better to lay at least two weeks of hardening.Finally, the screed must freeze after 28 days.
laminate screed placed a month pour a film and another 2-3 weeks of drying in the clear.
What is finishing screed?
Repair floor arrangement on only one tie, of course, does not end there.Finishing screed - the measures taken to obtain perfectly flat floor surface.It is carried out after finishing work in the room:
- spatula to remove the remains of floor paint solution;
- floor ground;
- floor overwritten until a perfectly flat surface.
On this floor you can go after only a day, and to lay floor covering - within 3-4 days.
Cement screed: alternatives
As we have said, instead of cement screed, you can dry - out of expanded clay backfill and superlistov GVL.From the "wet" ties: there is also a fast and reliable Polymer screed, or as it is called, "self-leveling floor".Most provide perlite insulation screed.It is used for the organization of the system "warm floor".
$ Cement floor screed: issue price
cost of the device floor screed will depend on whether you have decided on their own and buy everything you need to repair the floor, or the final figure will include the cost of the works of masters.
$ average cost of materials
- primer for floor Ceresit CT 17 (10 l) - from $ 10,1 / y .;
- lighthouse (3 m) - 0.7 $ / pcs .;
- plaster for fixing beacons (20 kg) - from 5.2 $ / bag;
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