Offer · Materials
STEICOzell blown-in insulation and STEICOflex batts, STEICOuniversal and STEICOspecial dry boards for roofs and render, STEICOmulti membranes, tapes and adhesives. For years we have been one of the few official STEICO distributors, so the whole system is in one shop and one yard, priced by the metre. The same products go into our own walls and roofs, so we know how they go together.
Official STEICO distributor
In our build-ups
Not a catalogue: two build-ups from the thermal reports of our houses. The wood-fibre layers are marked. All seven build-ups with their numbers and PDFs are on the build-ups page.
U 0.119 W/(m²·K)phase shift 18.0 h
Fibre blown in between the studs, a batt in the service cavity, a render board outside: three STEICO products in one wall.
U 0.132 W/(m²·K)phase shift 13.5 h
A sarking board on top, fibre between the rafters, a batt under them: a roof that holds summer heat back for well over ten hours.
Masonry or frame
It is the question we hear most. Instead of adjectives: three walls worked out with the method the thermal reports use (EN ISO 13786), translated into what you feel in the house. Where masonry or rock wool does as well or better, we say so.
| What we compare | Timber frame with STEICOHow we build | Timber frame with rock wool | Masonry: block and polystyrene |
|---|---|---|---|
| What is in the wallLayers from the inside of the house out. |
|
|
|
| What it is made ofThe raw material of the insulation. | Wood fibrefrom softwood, a renewable material; the CO₂ bound in it stays in the wall | Rock woolmolten basalt with a binder; a mineral, made at very high temperature | Clay and polystyrenefired clay and polystyrene, a plastic made from oil |
| Summer heatHow much of a hot day's heat reaches the room, and at what hour. | The least heatarrives at 6:00, when you are already airing the houseY_ie 0.0134 W/(m²·K), after 15.3 h | 2.1 times morearrives at 2:00, in the middle of the nightY_ie 0.0287 W/(m²·K), after 11.1 h | Almost the same10 % more than through STEICO, arrives at 4:00Y_ie 0.0148 W/(m²·K), after 12.7 h |
| Winter, heatingHow much heat escapes through a metre of wall in frost. The regulations (WT 2021) allow 0.20. | 44 % better than the law requires33 cm of wood fibre, the studs covered by the board outsideU 0.112 W/(m²·K) | The warmest of the three48 % below the limit: rock wool's λ is a touch lower than wood fibre'sU 0.103 W/(m²·K) | The most escapes19 % more than through STEICO, though still 33 % below the limitU 0.133 W/(m²·K) |
| Wall thicknessA thinner wall is more floor in the same footprint. | 36 cmrender and plasterboard included | 36 cmthe same, the same frame | 47 cmabout 4 m² less floor on every storey of a 10 × 12 m house |
| Vapour and moistureWhether the wall can dry out when moisture gets into the structure. | Open to vapourvapour passes outwards through every layer: a structure that gets damp dries outs_d 3.9 m | Open toothe same layers; rock wool does not hold vapour backs_d 3.5 m | Polystyrene seals the wallhardly any vapour gets through polystyrene, so a damp wall dries slowlys_d 10.0 m |
| Weight of the wallA heavy wall stores heat: it warms up slowly and cools slowly. A light wall loads the foundation less and arrives from the hall ready. | 51 kg/m²light: a crane puts it up in days, the foundation carries less | 48 kg/m²just as light | 4.6 times heavier237 kg/m²: more heat storage, masonry's real advantage; how much heat gets through is in the summer row |
| Building itHow long it takes and how much wet work there is on site. | Closed shell in about 2 monthswalls from the hall, assembled in days, developer standard in about 4 months | Just as fastif the walls are made in a hall, not on site | Usually two seasonswalls, floors, plasters and screeds have to dry before the finishing starts |
| PriceMaterials for a square metre of wall: gross prices of September 2026, no labour. Item by item below, under “Where the numbers come from”. | About PLN 55/m² more than with woolSTEICOzell between the studs even costs less than wool; the render board is what costs more. On the roughly 100 m² of walls of a single-storey 10 × 12 m house the difference is about PLN 5 500.about PLN 370/m² of materials | About 15 % less than STEICOfacade wool under the render costs about PLN 65/m² against about PLN 137/m² for STEICOprotect; frame, boards and render are the sameabout PLN 315/m² of materials | Cheapest materialsbut every layer is made on site: bricklaying, insulating and plastering are labour and months that a wall from the hall does not needabout PLN 265/m² of materials |
The hottest hour of the day is 15:00. Through each of the three walls its heat reaches the inside only at night or towards morning. The smaller the dot, the less heat gets in.
A hot day: 18 °C at night, 34 °C at 15:00, a steady 24 °C inside. Below, how much more heat than its daily average each of the three walls lets into the room, and the hour it peaks. Hover to read an hour.
| What we compare | STEICO frame | Rock-wool frame | Block and polystyrene |
|---|---|---|---|
| Wall thickness | 36.1 cm | 36.1 cm | 47.0 cm |
| Mass | 51 kg/m² | 48 kg/m² | 237 kg/m² |
| U, W/(m²·K) | 0.112 | 0.103 | 0.133 |
| Summer heat into the room, W/(m²·K) | 0.0134 | 0.0287 | 0.0148 |
| Delay of that heat | 15.3 h | 11.1 h | 12.7 h |
| Vapour resistance s_d | 3.9 m | 3.5 m | 10.0 m |
Layers taken as homogeneous, with no studs or mortar joints; the report for our wall with the studs gives 18.0 h and 94 times, this model 18.8 h and 93, so the proportions between the walls hold. Data: STEICO from its data sheets, rock wool at 35 and 120 kg/m³ with λ 0.035 and 0.036, a 25 cm clay block at λ 0.29 and 800 kg/m³, graphite polystyrene at λ 0.031 and 15 kg/m³, OSB µ 200. Summer can be described two ways. Damping at the inner surface (as in the reports) depends on the mass next to the room: masonry has more of it, 237 times against our 93, because it weighs five times as much. The heat that actually enters a room held at temperature (Y_ie per EN ISO 13786) depends on the whole wall: the STEICO frame lets the least through, and latest, masonry a touch more, the rock-wool frame twice as much. On top of that STEICO is 11 cm thinner than the masonry and the only one of the three that stays open to vapour: polystyrene seals the masonry (s_d 10 m).
STEICO frame
together PLN 373/m²
Rock-wool frame
together PLN 315/m²
Block and polystyrene
together PLN 267/m²
Exactly: the STEICO frame costs PLN 58/m² more in materials than the rock-wool frame (PLN 373 against 315/m²) and PLN 106/m² more than the masonry wall (PLN 267/m²). On the roughly 100 m² of walls of a single-storey 10 × 12 m house the difference to wool is PLN 5 800.
Gross prices of September 2026 for the materials of a m² of wall, without labour, transport or waste. STEICO, C24 timber and OSB at our shop's prices (STEICOzell counted as bags at 45 kg/m³; the shop prices it together with blowing it in), rock wool λ 0.035, dual-density facade wool, graphite EPS λ 0.031 and a 25 cm clay block at typical retail prices. Studs 45 × 170 at 60 cm with plates come to about 2.7 m of timber per m² of wall; the thin-coat render system (mortar, mesh, primer, render) is counted the same for all three walls. Take it as an order of magnitude: prices move, the differences between the walls stay.
Five products
Loose fibre for blowing into closed cavities, a springy batt between members, a thin board under the counter battens and thick boards under render. All from softwood, all vapour-open, all from one yard.
Loose fibre from fresh softwood, blown by machine into closed cavities: walls, roof, floor. Fills any shape with no cutting and no waste, including the voids around services. 15 kg bags; packed to 35 to 45 kg/m³ in a closed cavity, about 32 loose on a loft floor.
Where
A springy wood-fibre batt with the lowest λ in the range: 0.036. Pressed between studs and rafters it holds itself, with no bridges at the joints. For the service cavity, partition walls, under-rafter insulation and wherever blowing is not an option.
Where
A hard, water-repellent tongue-and-groove board made by the wet process with lignin as the binder. On the rafters it closes the roof against rain and wind before the covering goes on; on a wall it stands behind ventilated cladding. Vapour-open, so moisture leaves the insulation.
Where
The same job as universal, but made by the dry process: lighter, more stable and approved for render systems. Four jobs in one board: warmth, wind, rain and a render base. From 35 mm it can be blown against.
Where
A thick board at 140 kg/m³ and λ 0.040: the warmest render board in the range. On the outside of a timber-frame wall it does what 120 mm of STEICO board does in our Premium wall: adds warmth, damps the bridges at the studs and carries the render. Thicknesses above 100 mm to order.
Where
"From" prices are the shop's gross prices as of September 2026, technical data from STEICO's data sheets. Stock changes daily, other thicknesses to order.
Sealing
Insulation works when the build-up is tight to wind outside and to vapour inside. Eight products that close it, from the same yard.
Highly vapour-open breather membrane, s_d 0.02 m; for roofs and for walls behind cladding. Roll 1.5 × 50 m.
75 m²from PLN 1 160
In the shopVapour control on the inside, s_d 5 m: lets through as much vapour as a vapour-open build-up can shed. Roll 1.5 × 50 m.
75 m²from PLN 850
In the shopVariable vapour control: tight in winter, opens in summer to let moisture out of the build-up. For refurbishments and unventilated roofs. Roll 1.5 × 50 m.
75 m²from PLN 1 160
In the shopTape on a reinforced-film carrier for bonding outdoors and indoors, applied from −10 °C. 25 m.
25 mfrom PLN 99
In the shopTape on a paper carrier, torn by hand; also as patches for closing the holes after blowing. 60 mm, 40 m.
60 mm × 40 mfrom PLN 133
In the shopPermanently elastic sealing adhesive for joining membranes to walls, with no clamping battens. 310 ml.
310 mlfrom PLN 29
In the shopA compound with high compressive strength, for damp substrates, renderable. 310 ml.
310 mlfrom PLN 65
In the shopPrimer for absorbent substrates: gypsum-fibre boards, timber, wood-based panels. 1 l.
1 lfrom PLN 125
In the shopIn numbers
| λ, W/(m·K) | Specific heat, J/(kg·K) | Density, kg/m³ | Vapour resistance µ | Raw material | Price per m² at 10 cm | |
|---|---|---|---|---|---|---|
| STEICO wood fibre | 0.036 to 0.048 | 2,100 | 35 to 270 | 2 to 5 | PEFC softwood | approx. PLN 26 to 46 |
| Mineral wool | 0.032 to 0.040 | 1,030 | 30 to 100 | 1 | rock or glass | approx. PLN 30 to 60 |
| Polystyrene | 0.031 to 0.040 | 1,500 | 15 to 30 | 30 to 70 | crude oil | approx. PLN 20 to 30 |
Typical values for each class of material; STEICO from its data sheets, the others from manufacturers' declarations. Indicative prices per m² at 10 cm: STEICO from the shop (blown zell, flex batts, September 2026), rock wool and graphite polystyrene from typical market prices. Wood fibre and rock wool cost about the same; polystyrene is cheaper, but seals the wall to vapour. Summer comfort comes from density times specific heat: that is why wood fibre delays the heat and light polystyrene does not.
Quote
The shop calculator prices STEICO by the square metre and thickness: enter the area and the layer and see an indicative price straight away. One click sends the list to an adviser, who adds bags, pallets and delivery.
Contact
STEICO materials are sold by our advisors in Góra Motyczna, Jasło and Gorlice. Call or write with your build-up and they will get back to you with thicknesses, quantities and a price. We help after the sale too: with questions about fitting, come back to a branch or call.
Let's talk
Design, structure and materials from one company. Call or write. An advisor will tell you where to start.