Build Daily

August 12, 2017 18:06

Warming Penoplex foundation

basis of any home - a reliable foundation.From its state directly depends on the integrity, safety and durability of the building, and in particular degree - even indoor climate.It is therefore necessary to apply the most reliable and high-quality design and materials for the construction of the foundation.However, not enough just to build this part of the house - it requires special protection from external influences.

Warming Penoplex foundation

Warming foundation Penoplex

In one of the publications of our portal are detailed questions basement waterproofing .Usually conjunction with these measures with the right approach and it immediately provides insulation.For this can be used a variety of construction techniques, but the most common , simple, affordable self-insulation of a foundation Penoplex.

This article will examine the reasons for the need of thermal insulation of the foundation, the properties of insulation material - Penoplex set out the sequence of the process of conducting such operations and

used technological methods .

Why insulated foundation?

Article Contents

  • 1 Why insulated foundation?
  • 2 Penoplex - the optimum material for thermal insulation of the foundation
    • 2.1 Video: testing extruded polystyrene for strength
  • 3 schemes and the calculation of the basement insulation options
    • 3.1 Calculator insulation foundation thickness
    • 3.2 Video: tips on warming foundation Penoplex
  • 4 How is the insulation of the foundation Penoplex
    • 4.1 vertical wall insulation foundation
    • 4.2 Video: sequence of waterproofing and insulation works on the foundation
    • 4.3 Horizontal belt insulation of soil around the foundation
    • 4.4 Video: competently executed insulated blind area
    • 4.5 Features thermal insulation of the foundation slab

It would seem - what to insulate the foundation?It may seem that it is enough to isolate it from moisture, and this fully to ensure its safety.All accommodations are above, does not directly interact with a part of the basement and have their own thermal insulation.This opinion is quite widespread, so many homeowners simply shrug off the need for such work, even pawning their building plan. Meanwhile , foundation insulation is necessary for several reasons:

  • Massive foundation design and the cap becomes a "trunk by » penetrating cold.A significant part of the heat loss of the house is always associated with a poorly insulated floor of the first floor.Even seemingly, reliable thermo insulation cold bridge acts on a foundation base through walls.This leads to significant losses in terms of energy costs, and an uncomfortable atmosphere in the rooms.A properly conducted insulation gives up to 30% of the total heat savings.
  • The sole foundation is usually below the soil freezing and its temperature is sufficiently constant due to the constant influence of geothermal heat.The upper part is exposed to extreme temperatures.Such unevenness causing internal stress concrete structure associated with a difference of linear expansion of the material, which leads to a rapid its «aging». To entire array of the foundation had about the same warm-up, regardless of the season, need a reliable insulation.
  • layer of insulation on foundation walls displaces the dew point of the outside, and concrete will not dampen from condensation caused by a difference of external and internal temperatures.
  • Although any reinforced concrete structure has a certain margin of frost resistance, which is expressed in the number of full cycles of freezing and thawing better than this "internal reserve" is not spending unnecessarily and minimize or eliminate the impact of negative temperatures.
  • is advisable with the insulation of the foundation walls to hold still and insulation layers surrounding dirt backfill placed this horizontal thermal insulation times on the soles of the level (at melkozaglublennyh foundations) or under a concrete blind area.This can be achieved by reducing the risk of swelling soils during the freezing, which is the risk of deformation and foundation base.
  • layer insulation becomes even a sufficiently reliable barrier to soil moisture.In addition, it is well closes vulnerable to mechanical stress applied layer waterproofing.

Insulation of the foundation should be carried out on its outer wall.Insulating material, located inside the basement (basement) room, only slightly improve the climate there, but does not solve the main problems.

Penoplex - the optimum material for thermal insulation of the foundation

Of all the insulating materials is penoplex is probably the most optimal for thermal insulation of the basement and plinth.They are used, of course, other technologies such as spray foam, but still self-conduct such works better Penoplex and physical and operating characteristics, and price is still hard to find.

Penoplex - perhaps the best modern material for thermal insulation of the basement

Penoplex - perhaps the best modern material for thermal insulation of the foundation

Foam ks etc. edstavlyaet a plate of extruded polystyrene foam.extrusion technology, ie the melting of a mixture of polystyrene granules with foaming its special agents and subsequent pushing through the forming nozzle ( extrusion head), allows to obtain high-density material while maintaining excellent thermal insulation qualities.

  • Penoplex density varies, depending on the brand, from 30 to 45 kg / m³.This allows materials to withstand high mechanical loads.Thus, the limit of compressive forces at bulk deformation to 10%, even the most « easy » Penoplex - not less than 20 t / m², while the most dense and reaches 50 t / m².These indicators are not only enough for insulating basement walls, but also for laying thermoinsulator under his soles or mount it as a basis for pouring the foundation slab.

Video: Testing the strength of extruded polystyrene

  • have Penoplex for through its saturation air - excellent indicators of thermal resistance.Thus, the coefficients reflux eploprovodnosti just 0.030 W / m × Sº - one of the lowest among all modern insulating materials.
  • However , closed-cell structure of the material is highly resistant to moisture penetration.Water absorption in the first day does not exceed 0.2% of the total volume , for months - no more than 0,4 - 0,5%, and in the future, this value does not change during the whole periodoperation.
  • temperature range in which penoplex does not change its physical qualities - from - 50 to + 75 ° C.
  • material is completely harmless from an ecological point of view, not from degrades over time, it does not emit harmful substances, and its lifespan is estimated at no less than 30 - 40 years.

Penoplex produced in the form of rectangular plates, generally orange, size × 600 to 1200 mm, a thickness of 20 to 60 mm (pitch 10 mm), 80 or 100 mm.Plates have a locking Paso- the ridge portion, whereby the installation is extremely simplified and minimized, "cold bridges" at the junction of the panels.

produced several types Penoplex , which are divided into classes on the « Penoplex 31 With " to « Penoplex 75".The main difference - the level of density of the material, which is quite clearly expressed in the digital indicator.The structure of "Penoplex 31» and «35», addition, additionally made retardants , significantly increase their fire resistance.However, this figure is not critical for the external insulation of the foundation.For such work usually acquire the material class "35 With », «45 With », and for the installation under a oshvu or a slab foundation - "45".

schemes and calculation parameters warming foundation

So, to achieve efficiency of the thermal insulation of the foundation and column adjacent him soil warming system should include two sections:

Exemplary arrangements of insulation and possible errors

Exemplary layout of a heater anderrors

  • Vertical - layer insulation is installed directly on the outside wall of the basement, from the sole up to the top edge of the cap.This solves the problem of eliminating the "cold bridges" through walls and basement of the building.
  • horizontal - laid a solid layer on the perimeter of the building and prevents freezing of the soil around the foundation walls, thereby completely eliminating or reducing to the maximum extent of swelling processes.Depending on the depth of freezing in a particular location, the type of foundation and the burying layer may be located on the soles level or higher at a depth above the freezing point.In practice, very often a horizontal layer of insulation located directly beneath the concrete blind area.
Driving basement waterproofing with insulated blind area

Driving insulation basement with insulated blind area

The specialists recommend necessarily include a thickening of the horizontal heater belts at the corners of the building, at a certain distance along the walls - this will be discussed below.

Penoplex What should be the thickness of insulation to be effective, and fully justified the re its purpose?There are special techniques counting , used by experts.In some simplification can be made similar to the calculation of their own.

thickness Penoplex vertical section can be determined based on the following formula:

R = h 1 / λ 1 + h 2 / λ 2

R - is the value of heat transfer resistance, the constant set for specific regions considering their climatic features;

h 1 - the thickness of the foundation walls;

λ 1 - coefficient reflux eploprovodnosti material from which the foundation is made.

h 2 and λ 2 - respectively, the required thickness of the layer and its Penoplex coefficients reflux eploprovodnosti.

value R easy to clarify any local construction company - it is set SNIP 23 - 02-2003 .For example, the table below shows that the minimum value for some regions of Russia:

City (region) R - required thermal resistance m2 × ° K / W
Moscow 3.28
Krasnodar 2.44
Sochi 1.79
Rostov-on-Don 2.75
St. Petersburg 3.23
Krasnoyarsk 4.84
Voronezh 3.12
Yakutsk 5.28
Irkutsk 4.05
Volgograd 2.91
Astrakhan 2.76
Yekaterinburg 3.65
Nizhny Novgorod 3.36
Vladivostok 3.25
Magadan 4.33
Chelyabinsk 3.64
Tver 3.31
Novosibirsk 3.93
Samara 3.33
Perm 3.64
Ufa 3.48
Kazan 3.45
Omsk 3.82

For example, it is possible to calculate how thick should be vertical layer Penoplex onconcrete base 500 mm thick in the Moscow region:

R = 3,28

h 1 = 0, 5m

λ 1 concrete - W / m × ° By

λ 2 for Penoplex - 0.032 W / m × ° By

3,28 = 0,5 / 1,69 + h 2/ 0, 032

Simple arithmetic gives 0, 0955 m .Rounding should be, of course, in a big way, and as a result we get a layer Penoplex 100 mm.

calculator to calculate the thickness of the insulation of the foundation

To help readers work site, we present a special built-in calculator that allows you to quickly and accurately calculate the insulation thickness for different materials and sizes of the foundation, and for any type relevant in this case heaters.

Enter the requested information and click "Calculate insulation thickness"
Enter the table value of thermal resistance for your region (decimal - through point)
Specifyfoundation material
reinforced concrete blocks rubble concrete masonry (red burnt brick)
Select the type of insulation
polystyrene extruded foam polyurethane foam sprayed polyurethane panels
Specify foundation tape thickness
200 mm 250 mm 300mm 350 mm 400 mm 450 mm 500 mm

can use another method of calculation .She, in particular sense, even more convenient, as the show not only the thickness of the vertical insulation, but also the parameters of the horizontal belt Penoplex - its thickness and the necessary strengthening of the corners of the building.

There is such a thing as "frost index» ( MI ).This resulted indicator expresses the number of days with negative air temperature and the value of these temperatures, specific to the region.Expressed as he degree-hours .The chart lines, shows the distribution of isotherms MI in the European part of Russia.

Driving the indicative distribution of frost index (MI ) in the territory of the European part of Russia

diagram of an exemplary distribution of frost index (MI) in the territory of the European part of Russia

ascertained MI for its location, it is easy to design vertical and horizontal insulation of the foundation, based on the data table:

MI thickness of vertical insulation (mm) width horizontal insulation zone (m) thickness of the horizontal insulation belt (mm) length thicken portions of the building corners (m) thickness of the thickened portion (mm)
to 35,000 84 - - - -
35000 91 0.3 18 1.2 25
40000 98 0.6 32 1.2 44
50000 112 0.9 49 1.5 69
60000 126 1.2 63