10 best floor insulation

Review of the best according to the editors. About the selection criteria. The the material is subjective, is not advertising and is not serves as a guide to the purchase. Before purchase is needed consultation with a specialist.

In a private house, the floor of the first floor is very close to the ground and through it, cold and damp penetrates into the room, therefore Between the lags, high-quality insulation is required. In multi-storey buildings the basement is usually located below the basement, which also serves source of cold. In such cases, the apartment has additional flooring. pour and paste over with insulating materials. We figured it out what floor insulation are considered the best and provide you TOP 10 most popular thermal insulation. This will help determine what is best for your environment operation and affordable.

Rating of the best insulation for the floor

Nomination a place Name of product rating
Rating of the best insulation for the floor 1 Basalt wool 5.0
2 Foam glass 4.9
3 Polystyrene foam 4.8
4 Expanded clay 4.7
5 Expanded Vermiculite 4.6
6 Glass wool 4.5
7 Polyurethane foam 4.4
8 Polyvinyl chloride 4.3
9 Penofol 4.2
10 Penoizol-liquid foam 4.1

When compiling a list of the best heaters, we were guided the following characteristics: thermal conductivity of the material, density, exposure to burning or smoke, vapor permeability and hygroscopicity. Experts also drew attention to convenience installation and reviews of masters.

Basalt wool

Rating: 5.0

Basalt cotton wool

In the first place is basalt wool, which is a kind of mineral wool. Get the substance from the rocks, where in a furnace with a temperature of 1500 degrees the raw material is melted and then, at using centrifugal force, pull it into a thread. Cross section of the latter is 3-5 microns, so heat is transferred through them very slow (average 0.038 W / mK), which serves as an excellent insulation for the floor. The insulation may have a vertical or horizontally directed fibers, but considered more effective material with multidirectional villi. To knit a heater and give it shape, use tar and bitumen. Masters in reviews like how basalt wool is cut and if cut a little larger size, it is easy to squeeze and lay it on the floor. When choosing goods pay attention to density, varying from 10 to 30 kg / m³.

We marked insulation as the best, since it is absolutely not burns. In other structures of the building (walls, doors) it is used as a fire barrier. If wires are stretched under the floor, then This is the best fire protection.


  • does not prick hands during laying;
  • easy to lay on the floor;
  • if you step, it will not be damaged;
  • can be cut with a margin and not worry about compliance sizes.


  • it is necessary to lay a layer up to 100 mm high;
  • if placed below the dew point, it will gradually get wet and will lose heat-insulating properties.

Foam glass

Rating: 4.9

Foam glass

In second place is the insulation obtained by foaming glass. For this, a silicate material mixed with carbon is used. A homogeneous mixture enters the oven and heats to a temperature 800-900 degrees, after which the glass softens, and carbon reacts and foams it. As a result, closed pores with thin walls that poorly transfer heat to one side and cold to the other. The substance freezes in forms with 40-100 mm thick. It is laid on the lags in the floor, and the joints treated with sealant so that “cold bridges” do not form. Thermal conductivity of foam glass is 0.052 W / mK, which is only slightly inferior to stone wool.

Our experts have identified insulation as the best at the minimum vapor permeability. In the case of walls and ceilings, the transmission of steam is important, to remove excess moisture from the room (floors, as if “breathe”). But for the floor, complete tightness is important so that moisture from basement did not fall into the living room. Actual rate the vapor permeability of foam glass is 0.005 mg / (m.h. Pa). In practice the insulation does not let steam through at all, which means your floors will be dry despite the humidity in the basement.


  • absorbs noise up to 56 dB;
  • complete environmental safety;
  • does not burn;
  • resistant to damage by fungi and bacteria.


  • weak bending strength 0.4 MPa;
  • it is necessary to precisely adjust the size of the segments;
  • high price;
  • joints need to be treated with sealant.

Polystyrene foam

Rating: 4.8

Foamed polystyrene

Further in the review, expanded polystyrene, popularly known as Styrofoam. It is made from styrene copolymers whose granules filled with gas. The air dissolved in the polymer mass, increases granules in volume several times. Process takes place in special block forms to give a specific configuration to the material. After filling the matrix to the borders, the substance is sintered and cools down. Dense but light blocks are obtained (2% styrene and 98% air), the cross section of which can be from 20 to 100 mm. When warming the floor is laid between the lags, and the borders are processed polyurethane foam. Thermal conductivity of the insulation ranges from 0.036 to 0.050 W / mK.

We have identified this insulation as the best for the price. For example, one sheet with a cross section of 30 mm and dimensions of 1000×500 mm will cost the amount of 50 rubles. For 400 rub. can I buy insulation for the floor 4 m², which is enough for a small kitchen or hallway in the house. If floors require immediate insulation, and funds for repairs limited, pay attention to foamed polystyrene.


  • any section from 20 to 100 mm is on sale;
  • does not create a load on the floor due to low weight;
  • does not pass water;
  • environmentally friendly material.


  • crumbles during cutting;
  • exact dimensions must be observed;
  • seams are treated with sealant.

Expanded clay

Rating: 4.7

Expanded clay

This insulation differs from the above in that it is not in the form of blocks, but is loose. It is made from slate and clay. Raw materials from small granules fall into a large rotary kiln, set downhill. When turning the drum, the granules fall down and fired from a gas nozzle. It increases strength. material and removes moisture from it. Thermal conductivity is 0.912 W / mK. Expanded clay is one of the most environmentally friendly insulation for the floor. It doesn’t burn, what customers like about reviews. The owners of private houses use the balances landscape decoration because the pebbles are red and orange colors look good on black soil. When choosing insulation, pay attention to the size of the fractions, varying from 10 up to 40 mm.

In our opinion, the insulation is the best in terms of ease of installation. You do not you need to mark and cut something – the material is just pours out of the bag between the lags in the floor. After this surface leveled off. Small pebbles well cover all the cracks, forming a mixture of gravel and air, creating a powerful barrier to cold passage. The flooring is covered from above and the floors are ready.


  • when insulating the floor there is no need for sealant;
  • no cutting required;
  • fills narrow areas well;
  • frost resistant;
  • does not create a load on the floor.


  • there should be no gaps in the floor, otherwise it will wake up;
  • if for repair purposes it is necessary to remove part of the insulation, then this is harder to do than with other materials.

Expanded Vermiculite

Rating: 4.6


And here is another bulk material that may be from fractions from 0.5 to 8 mm. As you can see, it is smaller than expanded clay, therefore fills the space in the floor even denser. Vermiculite is representative of hydromica, characterized by a multilayer structure. it a mineral that has learned to expand to increase in volume and reduce its weight. The thickness of the embankment 10 cm of vermiculite is similar in thermal insulation of 1 m of brickwork or 35 cm of a wooden bar. The thermal conductivity of the substance varies from 0.045 to 0.053 W / mK, which only slightly inferior to mineral wool. In reviews, buyers satisfied with the affordable price of the goods and the ease of installation in floor.

This is another best insulation for the floor. fire resistance. The substance is completely non-combustible and retains its shape (does not melt) to a temperature of 1300 degrees. At the same time, the filler in the floor is resistant to alkalis and acids, therefore spilled liquids leaking through the flooring will not spoil the layer thermal insulation. Therefore, the material is well suited for filling in floors. not only domestic but also industrial buildings.


  • does not decay under the influence of microorganisms;
  • does not decompose;
  • rodents are indifferent to him;
  • insects do not live in it.


  • the floor space needs to be covered from the slots, since fine fractions of 1-4 mm easily wake up.

Glass wool

Rating: 4.5


The review continues another insulation related to the section mineral wool. Here the raw material is glass battle or constituents (soda, sand, borax, dolomite, limestone). Weight melts in a bunker at a temperature of 1400 degrees. Thereafter the composition enters a centrifuge, where it is inflated with steam to form the thinnest threads. When generating fibers, the material is processed aerosols. Then on the conveyor, the substance is leveled and molded. At 250 ° C, polymerization begins, giving the fibers strength. As a result, hairs with a section of 3-15 microns are formed, and the total thermal conductivity is obtained 0.030-0.052 W / mK. In contact with open flame heater withstands temperatures up to 450 degrees.

The insulation is recognized by us as the best, since it has a fiber length of 2-4 times more than similar types of mineral wool. it makes glass wool stronger. When laying blocks on the floor, it is smaller stretched and torn. Another advantage of long threads is resistance to vibration loads, so insulation can be used on production, where powerful machine tools and machines work.


  • affordable cost;
  • easy to cut;
  • simple installation on logs in the floor;
  • it is not necessary to maintain the exact size between the beams.


  • pricks when laying and causes itching;
  • it is necessary to carry out work on the insulation of the floor in a respirator.

Polyurethane foam

Rating: 4.4


This insulation can be in two forms: elastic or rigid. The first is known to many as foam rubber. But for thermal insulation of the floor is better The second option is suitable. It is fed from a special installation in liquid form, after which it expands from a chemical reaction with air and polymerizes. At the heart of polyurethane are plastics consisting of gas at 85-90%. It provides ease. substances and sufficient viscosity. When the filler solidifies, it becomes durable and can only be removed mechanically. Reviews show that insulation is liked by craftsmen for their service life, constituting 15-20 years.

Our experts found the insulation to be the best in terms of occupancy. space under the floor. Due to liquid application spreads well and fills all the cracks. The wizard does not need adjust the size between the beams in the floor, since the tool itself will go through the channels. To mount the flooring, it remains only cut off the protruding sections of the foam. When using this formation of “cold bridges” or moves for insects.


  • resistant to solvents;
  • does not cause interest in rodents;
  • resists moisture absorption;
  • does not rot.


  • sophisticated application equipment is required;
  • then it’s difficult to remove a piece of material from under the floor.

Polyvinyl chloride

Rating: 4.3

Polyvinyl chloride

This insulation is also called PVC, vinyl or vinyl. For bookmark foamed plastic is used in the floors, which is available in mats. They can be stacked in whole sheets without cutting directly under flooring or even on top of it when the next layer is the finish floor finish. The thermal conductivity of the material reaches 0.159 W / mK. Masters praise the product in reviews for increased resistance to loads. The tensile strength is 40-50 MPa, and when trying to bend the panel, the indicator varies from 80 to 120 MPa

This insulation stands out for its small cross section. Mats Available with a thickness of 2-5 mm, although there are 19 mm. Apply it relevant for insulation of floors in an apartment where there is no lag and sufficient space, and using other placeholders will result in reducing the height of the room. Sheets 2-5 mm can be laid under linoleum or laminate, which will create an additional thermally insulating layer. Unlike cork, polyvinyl chloride is resistant to detergents. means and saline solutions, therefore, will serve on the floor longer.


  • ability to absorb sounds and vibration;
  • resistant to aggressive chemical environments;
  • tensile strength is 40-50 MPa;
  • Refers to a hardly combustible group.


  • high price;
  • the composition includes light-absorbing dyes;
  • after completely wet, it may become more severe (required properly stored until installation).


Rating: 4.2


Further in the review, floor insulation made from foamed polyethylene. Thanks to the closed cellular structure the layer significantly complicates the transfer of heat. Produced material with a cross section from 3 to 10 mm. It is sold in rolls, for example, with a width of 1.2 and a length of 15 m. Masters note that insulation is easy to cut to the desired size when laying on the floor. In view of small cross-section of the mats does not need to be cut to bookmark between lags, but you can sew up the floor in a continuous layer, bypassing each beam. It is allowed to use insulation on the floors in the apartment where it is can serve as a layer under linoleum. Thermal conductivity insulation is at the level of mineral wool and is 0.039 W / mK.

The chip of the material is the presence of two layers of aluminum, which not only serve as reinforcement, but also effectively reflect the temperature in both directions (the cold from the basement comes back down, and heat from the room back to the apartment).


  • resistance to mechanical stress;
  • high density allows the use of a smaller layer;
  • no need for vapor barrier;
  • convenient to transport;
  • safe to use and does not require personal funds protection.


  • high price;
  • with a thickness of 10 mm it reduces noise by only 20 dB.

Penoizol-liquid foam

Rating: 4.1


Foam, which is not fed into solidified, but in liquid form. It is sprayed from a special pumping station. station. The process is not complicated, and the foam sets in 10-15 minutes. After 3-4 hours, it already reaches hardness, and the final curing occurs a few days later. But it doesn’t affects the ability to lay floors, since all processes occur beneath them with air access. In user reviews praise insulation for floors for its resilience. Substance preserves some elasticity and evens out after getting dents. In addition to thermal insulation properties, liquid foam is excellent resists vibration transmission, so if your home is located close to the metro or tram line, the filler will serve additional protection against shaking. 5 cm thermal conductivity Penoizol replace 12.5 cm of mineral wool.

Liquid polystyrene foam is released by the accelerated process installation, in the presence of specialized equipment. If you build a large house with an area of ​​100 m² or more, where required insulate floors in one day so as not to stretch the process and not inhibit other work, use penoizol. His masters apply 20-40 m³ per day.


  • mice do not start;
  • the material is environmentally friendly;
  • quick installation;
  • It withstands shock and load.


  • specialized equipment required;
  • it can cause allergies in some, but it’s individually and quite rare.

Attention! This rating is subjective, is not advertising and does not serve as a guide to the purchase. Before the purchase consultation with a specialist is necessary.

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