Winter in the garage without insulation turns into a test: frozen walls, condensation on the ceiling, and the car has to warm up twice as long. penplex (extruded polystyrene foam) solves these problems better than traditional mineral wool - it does not absorb moisture, does not rot and holds heat 1.5 times more efficiently. But in order for the result to meet expectations, you need to know the nuances: from the choice of plate thickness to the processing of seams.

In this article, step-by-step technology of garage insulation with Penplex, taking into account the climatic zones of Russia, calculating the amount of material and fastening methods that will exclude β€œcold bridges”. We will understand how to avoid mistakes when working with metal and concrete walls, as well as how to insulate the ceiling from the floor. At the end – checklist for purchase materials and answers to frequent questions.

Why a penplex and not another heater?

There are dozens of insulation products on the market, but three parameters are critical for the garage: thermal conductivity, waterproofness and longevity. Compare Penoplex with popular alternatives:

Materials Thermal conductivity (W/mΒ·K) Moisture absorption (%) Duration of service (years) Cost (per m2, 50 mm)
penplex 0.030 0.2 50+ 250 rubles
Mineral wool 0.038 1.5 10–15 180 rubles
Foam (PSB-C) 0.039 2–4 20–30 120 rubles
Sprayed PPU 0.025 0.1 30+ 800 rubles

The key advantage of Penplex is cell-structure. It does not let vapor pass, so the insulation does not get wet even with direct contact with water (relevant for garages with a leaky roof). In addition, the plates can withstand a load of up to 20 tons / m2 - they can be mounted under the floor screed.

The material has disadvantages too:

  • πŸ”₯ Fuel (class G3-G4). It requires protection with non-combustible coatings (for example, plaster).
  • 🦟 It attracts rodents. We need a metal grid in vulnerable areas.
  • πŸ’° The price is higher than foam. But it pays off in 3-5 seasons due to savings on heating.
⚠️ Note: If the garage is stored gasoline or other fuels, the foamplex should be covered with a layer fire-proof plaster at least 3 cm thick. Otherwise, in case of fire, the heater will emit toxic smoke.

Penoplex thickness: how to calculate for your region

The optimal thickness of the insulation depends on climate-zone and the material of the garage walls. For the calculation, use the formula:

Thickness (mm) = R Γ— Ξ»where:

  • R the normalized resistance to heat transfer (see para. table below),
  • Ξ» - the coefficient of thermal conductivity of the Penplex (0.030 W / mΒ·K).
Region R (m2Β·K/W) for walls Recommended thickness of the Penplex (mm)
Moscow, SPb 3.16 100
Yekaterinburg, Novosibirsk 3.65 110–120
Krasnoyarsk, Irkutsk 4.2 120–130
Yakutia, Magadan 4.8 140–150

For metal garages, the thickness is increased by 20-30% due to the high thermal conductivity of the metal. For example, in the suburbs for brick walls enough 100 mm foamplexAnd you'll need metal for that. 120-130 mm.

If the budget is limited, at least keep it warm. gateway They take up to 40% of the heat. For the gate, the thickness of 60-80 mm is optimal (so as not to weight the structure).

πŸ“Š What's your garage?
Bricky
Metallic
Concrete
Wooden
Other

Preparing the garage for insulation: what to do

Before installing the Penoplex garage needs to be prepared. Skip this stage - and the insulation will fall off in a year or become a hotbed of mold.

Remove old coating (paint, plaster, plastering) | Finish cracks in the walls with mounting foam or cement | Treat the metal with an anti-corrosion composition (for example, Zincor-Auto.)| Check ventilation (inlets should not be closed with insulation)| Remove electrical wiring from the walls (or fix it in corrugated)->

Pay special attention humidity:

  • πŸ’§ If the walls are damp, dry the garage with a heat gun for 2-3 days.
  • πŸ„ When you are in the dark, treat the surface. antiseptic (e.g., Dali or Biotol Spray.).
  • πŸ”Œ Insulate the electrical wiring - the Penoplex does not conduct current, but during installation it is easy to damage the cable.
⚠️ Note: If the garage is built on pulpy soils, check the groundwater level before insulating the floor. With high UGV (above 1.5 m), drainage or a sprinkle of ceramsite is needed - otherwise the insulation plates will "pop up" in frosts.

For metal garages, an additional step is crib. It is made of a timber 50Γ—50 mm or a metal profile, fastened to the walls with screws in steps of 60 cm. The crate is used to:

  • πŸ”Ή Line up the rough walls.
  • πŸ”Ή Create a ventilation gap (if you plan to cladding with a wagon).
  • πŸ”Ή Make it easier to fix the foamplex (plates are inserted between the bars).

Step by step instructions: how to fasten Penoplex to the walls

The technology of installation depends on the material of the walls. Let’s look at the two most common cases: concrete/brick and metal.

Method 1: Glue installation (for concrete and brick walls)

You'll need:

  • πŸ“¦ Penoplex (thickness according to the calculation).
  • 🧴 Styrofoam adhesives (e.g., polystyrene foam) Ceresit CT 83 or T-Avangard-K).
  • πŸ”¨ Dubel-fungi (5-6 pcs). on the stove.
  • πŸ”ͺ Spatial spatula (8-10 mm).
  • 🧹 Deep penetration ground.

Work order:

  1. Grounding the walls for better grip. Dry 4-6 hours.
  2. We put glue on the Penoplex stove. perimeter and cross-cross (see para. photo. The thickness of the layer is 2-3 mm.
  3. We put the plate against the wall, press and level. Start from the corner.
  4. After 24 hours, we drill holes under the dowel-fungi (in the corners and center of the plate). The depth of the hole is 10 mm more than the length of the dowel.
  5. We'll hammer the fungi, put the hats on.

Key points:

  • πŸ”Ή Stitches between the plates glue foil-scotch - that'll eliminate cold bridges.
  • πŸ”Ή If the walls are uneven, use glue with reinforcing fibers (for example, Knauf Sevener).
  • πŸ”Ή For angles and slopes, take plates from L-edged - they dock without gaps.

Method 2: Fixing to screws (for metal garages)

Metal does not hold glue, so the Penoplex is fastened mechanically:

  1. We put the plate on the crate, mark the place of attachment with a pencil.
  2. We drill holes in the metal with a metal drill.
  3. We fasten the plates with screws with a press puck (step 20-25 cm). Under the hat, put the washer 60 mm, so as not to push the insulation.
  4. We fill the stitches with mounting foam. toluene-free (e.g., Tytan Professional).
πŸ’‘

For metal garages, use a penplex with foil-layer It reflects heat back into the room, increasing the insulation efficiency by 15-20%.

Insulation of the ceiling and gate: nuances

Ceiling insulated wall-wallto eliminate condensation at the joints. For garages with a flat roof, the same technology is suitable as for walls. But there are features:

For roof-top:

  • πŸ”Ή The plates are fixed from the bottom up, starting from the cornice.
  • πŸ”Ή Use it. glue-foam (e.g., Soudal Soudafoam) β€” it fixes the insulation in 10 minutes.
  • πŸ”Ή Vapour isolation is required (e.g. Issopan B) - its stapler is attached to the crate before the installation of the Penoplex.

For garage-gate:

  • πŸ”Ή The optimal thickness of the insulation is 40-50 mm (so as not to interfere with the opening).
  • πŸ”Ή The foam is attached to the mounting foam, additionally fixing with aluminum tape.
  • πŸ”Ή Sheathed on top profluous or OCB-stove Protecting against mechanical damage.

⚠️ Warning: When insulating the gate, leave a gap of 5-10 mm between the insulation and the lock / bolt. Otherwise, in the cold, the mechanism can jam.

Floor insulation: when it is necessary and how to do

The floor in the garage is insulated only in three cases:

  1. The garage is built on fuzzy (clay, loam).
  2. Planned. heater (temperature above +10Β°C).
  3. Paul concrete and freezing (car condensation in the morning).

Floor insulation technology:

  1. Remove the upper layer of soil by 30-40 cm.
  2. We make a sprinkle: 10 cm of sand + 10 cm of rubble, trambull.
  3. We lay the Penoplex (100 mm thick) in staggered order, the seams are glued with scotch.
  4. On top - waterproofing (dense polyethylene) and reinforced screed (5-7 cm).
What happens if you insulate the floor without waterproofing?

The concrete will absorb moisture from the soil, which in winter will freeze and destroy the screed. The foamplex will lose up to 40% of its thermal insulation properties due to condensation between the plates. The garage will smell damp, and the car will rust.

For wood-flooring:

  • πŸ”Ή The foamplex is laid between the lags.
  • πŸ”Ή The gaps are foaming, the top is flooring. CPF or ESB.
  • πŸ”Ή Ventilation of the subfloor (blows in the corners) is required.

Finishing after insulation: how to close the Penplex

The insulation must be protected from mechanical damage and sunlight (UV destroys polystyrene foam). Finishing options:

Materials Pluses Cons Cost (m2)
Plaster on the grid Fire resistance, vapor permeability It takes skill, it takes a long time to dry. 300 rubles
Profleesh Durability, fast installation Condensate on the inside 250 rubles
Wagon (PVC or wooden) Aesthetics, additional thermal insulation It absorbs smells, it's afraid of moisture. 400 rubles
SDB + painting Cheap, just mounting. Low moisture resistance 200 rubles

For metal garages, the best choice is quilt polymer-coated. It's attached to the crate with screws with rubber washers. For concrete walls, optimal plaster-net:

  1. We glue a fiberglass mesh on the Penoplex (cell 5Γ—5 mm).
  2. Apply the first layer of plaster (3-4 mm), dry 24 hours.
  3. Put it on and paint it. stainless (e.g., Tikkurila Euro 7).

Tip: If the garage is heated, use it. drywall It is cheaper than a car and does not support combustion. But just mount it. waterproof (GKLV).

πŸ’‘

Do not cover the Penoplex with films from both sides - this will lead to the accumulation of condensate inside the insulation. It is enough to have one vapor insulation (from the warm air).

Frequent Mistakes and How to Avoid Them

Even experienced masters make mistakes when insulating with Penplex. Here are the top 5 mistakes and their consequences:

  1. Ignoring ventilation. Closed supply holes lead to moisture accumulation and rust on the machine.
    ⚠️ Attention: For 10 m2 of the garage, at least one supply hole 100 mm (with a rodent grille) is needed.
  2. Savings on the thickness of the insulation. Foam 30 mm in Siberia is useless - the temperature in the garage will be only 2-3 Β° C above the street.
  3. Fixing to mounting foam without dowels. In a year, the plates will fall off under their own weight.
  4. Lack of floor waterproofing. In spring, groundwater will raise the insulation plates, deforming the screed.
  5. Using foam instead of foamplex. In 2-3 years, the foam will crumble from temperature changes.

Another common mistake. wall-insulation. Research by research NIISF RAASNThrough the uninsulated ceiling, up to 30% of heat goes, and through the floor - up to 15%. Optimal order of insulation: ceilings, walls, gates, floors.

FAQ: Answers to Frequent Questions

Can I insulate the garage with a penplex from the inside, if there is no possibility outside?

Yeah, but there's a nuance:

  • πŸ”Ή The thickness of the insulation should be 20% greater (due to the displacement of the dew point inside the wall).
  • πŸ”Ή Vapour isolation from the room is required (for example, Issopan D).
  • πŸ”Ή The walls before insulation must be dried and treated with an antiseptic.

In metal garages, internal insulation is the only option, but requires a ventilation gap of 2-3 cm between the insulation and the skin.

Which glue is better for Penplex: dry mixture or foam?

Depends on the surface:

  • πŸ”Ή Dry mixture (Ceresit CT 83) for concrete and brick. It is cheaper but dries longer (24 hours).
  • πŸ”Ή Clay foam (Tytan Styro 753) for metal and uneven walls. It takes 10 minutes, but it's more expensive.

For the ceiling, use only foam - it does not slide when vertically mounted.

Do I need to clean the garage if it is not heated?

Yes, even without heating, insulation gives three pluses:

  1. The temperature in the garage in winter will be 5-10 Β° C above the street (the car will start more easily).
  2. Condensation on the body is excluded (the main cause of rust).
  3. In summer, the garage will be cooler (Penoplex works as a thermal insulator in both directions).

The minimum thickness of the insulation for an unheated garage is 50 mm.

How to cut the Penoplex so that it does not crumble?

Use this:

  • πŸ”Ή Metal knife - the cleanest cut.
  • πŸ”Ή Electrojigsaw with a laminate file (small teeth).
  • πŸ”Ή Construction knife - only for plates up to 50 mm thick (cut in a ruler).

Do not use a Bulgarian – it melts the edges, and the joints will turn out to be uneven.

How to protect Penoplex from mice?

Mice chew through the insulation to make nests. Methods of protection:

  • πŸ”Ή Before installation, treat the plates boric acid (Dilute 10 g per 1 liter of water, spray).
  • πŸ”Ή Close the insulation. metal-grid (cell 1-2 mm) from the side of the floor and the gate.
  • πŸ”Ή Spread it under the stoves. ultrasonic deterrent (e.g., Tornado ODS.01).

In metal garages, mice are rarely started - they are scared away by the smell of oil and gasoline.