Mats for a warm water floor: with clamps, on foam board


The com­fort of res­i­den­tial build­ings is increas­ing all the time, to a large extent this is facil­i­tat­ed by such an inno­v­a­tive heat­ing sys­tem solu­tion as “warm floors”. The heat com­ing from the floor cre­ates a spe­cial atmos­phere of habi­ta­tion and com­fort in the room.

The mod­ern mar­ket offers sev­er­al basic vari­eties of such floors, and water — struc­tural­ly is the most promis­ing mod­el.

To equip it, you will need pipes that ensure the move­ment of the heat car­ri­er and addi­tion­al com­po­nents that increase the over­all effi­cien­cy of the sys­tem. To sim­pli­fy instal­la­tion and make it con­ve­nient — use mats for insu­la­tion.

What are mats for?

The func­tion­al effect of the water floor depends on how well and tech­ni­cal­ly the ther­mal insu­la­tion sys­tem was arrangedas well as from the cor­rect lay­ing of heat pipes on top of it.
underfloor heating for maximum comfort
It does not make sense to refuse it, since then most of the ener­gy will go to heat­ing the floor slabs or the foun­da­tion. Ther­mal insu­la­tion helps to cor­rect heat flows in the required direc­tion. If the heat goes up, then unnec­es­sary ener­gy con­sump­tion is pre­vent­ed.

It is also impor­tant that the mats take on a fair­ly large load. It con­sists of the grav­i­ty of the pipes them­selves, which are filled with a heat car­ri­er, from the mass of the screed block­ing the pipeline, the fin­ish­ing floor cov­er­ing and dynam­ic exter­nal loads that are inevitable after the start of oper­a­tion.

The mate­r­i­al used to cre­ate the sub­strate must be very dense in order to resist and not deform. Its min­i­mum allow­able den­si­ty is 35 kg/m³.


Mats are of sev­er­al types.


Man­u­fac­tured from expand­ed polyurethane foam. They are used in cas­es where the floor is laid as an addi­tion to the cen­tral heat­ing sys­tem. The spe­cif­ic name of the mate­r­i­al is peno­fol, it is on one side that it is cov­ered with a lay­er of foil.

It is laid with foil to the top, and heat­ing pipes are placed on it. Such prod­ucts are not suit­able for arrang­ing a warm water floor if the hous­ing is locat­ed on the ground floor and there are base­ments under it. It makes no sense to use them in the repair of a pri­vate one-sto­ry house.

Under such con­di­tions, their effi­cien­cy in terms of heat reten­tion is min­i­mal, which means that the entire sys­tem will be inef­fi­cient.

To fix such mats, you need to pur­chase addi­tion­al fas­ten­ers.for exam­ple, a met­al coarse mesh, a set of clamps, clips or sta­ples.

With film

film mats for underfloor heating They can also be clas­si­fied as a foil sub­strate for a water-heat­ed floor.they are made of expand­ed poly­styrene, but at the same time it is high-den­si­ty, from 30–35 kg / m³.

The prod­uct also includes a lay­er of foil and a lay­er of poly­mer film with pro­tec­tive func­tion. This film has spe­cial mark­ings that will help when lay­ing pipes. This type of mats is quite effec­tive as a heat-insu­lat­ing mate­r­i­al.

The den­si­ty is such that the pipe clamps are held very secure­ly. A screed will lie well on top of such a sub­strate.which will not crack the set­ting.

Film mats are used to cre­ate under­floor heat­ing where it will be the pri­ma­ry source of heat. An addi­tion­al lamel­la sys­tem ensures excel­lent styling, so the heat is retained for a long time.

Flat Styrofoam

underfloor heating based on a heating mat

One of the best ther­mal insu­la­tion mats for under­floor heat­ing. Their thick­ness ranges from 40–50 mm, which allows them to be used as a sub­strate. An impor­tant para­me­ter is the high den­si­ty, from 40 kg/m³. Per­fect for rooms in which it is planned to make the floor the only ele­ment of the heat­ing sys­tem.

The mate­r­i­al is prac­ti­cal­ly not sub­ject to wear and defor­ma­tion. Pipes are attached to them using spe­cial plas­tic fas­ten­ers. Minus — before lay­ing pipes, the mas­ter must per­son­al­ly apply the markup.

After lay­ing, the sub­strate is cov­ered with a lay­er of poly­eth­yl­ene, to pre­vent a chem­i­cal reac­tion at the moment of con­tact between the sheets and the cement-con­tain­ing screed.

With bosses (profile)

warm floor with lugsThe most used mod­el of poly­styrene foam sub­strate. They are made using the hydropel­lent stamp­ing method, as a result of which boss­es appear, pecu­liar pro­tru­sions that are arranged in even rows on the sur­face of the prod­uct.

Boss­es make it pos­si­ble to quick­ly lay pipes until the moment of test crimp­ing and pour­ing with a screed. High-den­si­ty slabs for under­floor heat­ing are square in shape and have a thick­ness of 10 to 35 mm. The pro­tru­sions are low, about 25 mm in height, usu­al­ly cubic or cylin­dri­cal, in the space between them a pipe fits freely.

The pipes are secure­ly fixed and do not move when poured with a fin­ish­ing screed. Avail­able with and with­out lam­i­nate, the first ones have a lay­er of vapor bar­ri­er film coat­ing on top.

Characteristics of expanded polystyrene

Its den­si­ty should be 40 kg / m³ so that the prod­ucts can with­stand var­i­ous mechan­i­cal loads. Expand­ed poly­styrene has low ther­mal con­duc­tiv­i­ty, it is only 0.037 to 0.052 W/m×K. This is nec­es­sary for good ther­mal insu­la­tion.

Prod­ucts with lugs are able to absorb sounds and nois­es. The stan­dard noise absorp­tion rate is 24 dB with a lay­er thick­ness of 20 mm.

Reli­able water­proof­ing is pro­vid­ed by lam­i­nate and cen­ter­ing fas­ten­ers locat­ed at the ends of each pan­el. They are nec­es­sary for lay­ing out a con­tin­u­ous sur­face from indi­vid­ual ele­ments. Pro­file mats for under­floor heat­ing water per­fect­ly inter­lock with each oth­er, and this elim­i­nates the pos­si­bil­i­ty of the for­ma­tion of suture cracks. Stan­dard plate para­me­ters are 1.0 × 1.0 or 0.8 × 0.6 m.

Benefits of using mats

If the mat is installed cor­rect­ly, it can serve as an excel­lent sound­proof­ing mate­r­i­al. But there is a sig­nif­i­cant nuance — water heat­ed floor should be absolute­ly safe for those who live below. There­fore, along with reli­a­bil­i­ty and dura­bil­i­ty, such a cri­te­ri­on as water­proof­ing is val­ued. And the same lay­er is designed to pro­tect the sub­strate itself from the dam­ag­ing effects of the floor cement mor­tar.

There is an unpro­fes­sion­al opin­ion, whose sup­port­ers talk about the pos­si­bil­i­ty of refus­ing mats when lay­ing floors. But this posi­tion is erro­neous, since heat loss­es will be so great that they will inevitably lead to sig­nif­i­cant finan­cial loss­es.

If we con­sid­er the cost of all water floor sys­tems as a whole, then the price of heaters is not so high. BUT a design made once and by the mind — one hun­dred per­cent will pay off dur­ing oper­a­tion.


warm floor mats

  1. All parts must be con­nect­ed to each oth­er. And under the sheets, regard­less of their type, there must be a sub­strate made of a water­proof­ing film;
  2. Along the perime­ter of the floor at the edge of the wall water­proof­ing film is fixed using a damper tape;
  3. Slabs are laid on top of the water­proof­ing, mats for a water-heat­ed floor made of foam board must be fas­tened togeth­er with the help of lock­ing mech­a­nisms pro­vid­ed at the ends. If the weight and thick­ness of the insu­la­tion allow, then the plates can be addi­tion­al­ly fixed with glue;
  4. It is strict­ly for­bid­den to use nails for fas­ten­ing and so on, since this vio­lates the integri­ty of the prod­uct and great­ly reduces its strength;
  5. Flat plates with­out fas­ten­ers are laid very tight­ly and seat­ed on a glue “cush­ion”. Foil prod­ucts are glued with tape to achieve com­plete tight­ness;
  6. Once the sheets are fixed — start mark­ing and lay­ing the water cir­cuit;
  7. The final stage — top coat for under­floor heat­ing.

Prices and how to choose

Sav­ing heat and ener­gy speaks for itself, mak­ing water floor mats a well-found­ed pur­chase:

underfloor heating how to choose mats

  • Before pur­chas­ing a sub­strate, you need to demand from the sell­er all the doc­u­ments, cer­ti­fy­ing not only the qual­i­ty of the prod­uct, but also con­firm­ing its fire and envi­ron­men­tal stan­dards. Mats with­out such doc­u­ments may be brand name fakes and will not be able to with­stand the expect­ed loads;
  • It is bet­ter to choose those prod­ucts that have a lam­i­nat­ing lay­er is a guar­an­tee of addi­tion­al insu­la­tion. This coat­ing adheres per­fect­ly to both semi-dry and wet screed;
  • The thick­ness of the mat is cho­sen, tak­ing into account the thick­ness of the screed itself. and fin­ish coat­ing. It is nec­es­sary to pay atten­tion to the ther­mal insu­la­tion in the room, since many ceil­ings already have a sim­i­lar lay­er.
  • Some­times the design of a warm water floor allows you to pur­chase mats with boss­es that do not have ther­mal insu­la­tion qual­i­ties. But in this case, their only plus is the reli­able fix­a­tion of the pipeline sys­tem.

aver­age price on mats for a warm water floor:

  • REHAUGer­many: from 8 dol­lars per item.
  • OVENTROPGer­many: from 1 dol­lars (roll sub­strate) to 12$ per prod­uct;
  • Ener­goflexEurope: from 20 rubles to 70 rubles per item.

Choose only high-qual­i­ty pipes for plumb­ing in a pri­vate house! What — read here.

If you use water from a well or a well, you def­i­nite­ly need to install fil­ters in a pri­vate house, read about it in the arti­cle.

Take care of the unin­ter­rupt­ed sup­ply of water to the house by installing a reli­able pump­ing sta­tion for water sup­ply. More infor­ma­tion here.

After the deci­sion was made to cre­ate a water floor, you need to care­ful­ly con­sid­er all the small details and nuances of work­ing with this sys­tem. The pur­chase and instal­la­tion of cor­rect­ly select­ed mount­ing mats for a water-heat­ed floor helps save a lot of mon­ey when heat­ing your own home.

The main thing is to cal­cu­late all the para­me­ters in advance and buy exact­ly what fits the giv­en con­di­tions.

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