Isospan: types, characteristics and instructions for use

Here at "All about the Roof," we cover all the information you require to understand roofing materials. Today, we explore the types, properties, and practical applications of isospan. Isospan is a multipurpose material that is frequently used in building and roofing projects because of its insulating qualities.

There are different varieties of isospan, each made to fulfill a particular purpose in insulation. It is usually offered as stiff panels composed of a blend of materials such as polystyrene or polyurethane foam. These panels are simple to handle and install because they are robust but lightweight.

The superior thermal insulation capacity of Isospan is one of its primary features. By minimizing heat gain in warmer climates and reducing heat loss in colder ones, it aids in the regulation of indoor temperatures. This energy-saving feature helps reduce heating and cooling expenses while also improving comfort.

Effective use of Isospan requires using the right installation methods. Make sure the roof surface is clear of debris, dry, and clean before installing. To prevent gaps that could compromise insulation, the panels should be precisely cut to fit. To avoid the panels moving over time and potentially decreasing their effectiveness, firmly fasten them.

The use of isospan

Isospan is a non-woven film or membrane that is used in insulation structures to prevent rot and corrosion in metal and wood components, as well as to shield heat insulators from moisture.

To prevent moisture buildup on the fibrous insulation, the construction uses a steam banker for installation from the attic side and waterproofs the isopan roof, which is fastened directly along the rafters beneath the crate. Additionally, attic floors, ceilings, and side-wall thermal insulation are all insulated with vapor barrier film.

When insulating the exterior of a wooden structure, a vapor permeable membrane is used to shield the fibrous heat insulator from weathering while leaving steam production unhindered.

Types and purpose of the material

Find out what kinds of isospana the manufacturer offers, in terms of their features and purposes, before purchasing the material. Rolls of non-woven canvas and film, along with extra coating, are included in the assortment. Isospana installation is done in accordance with the intended use of each individual product type.

There are notable distinctions between the vapor barrier isospan characteristics of the various types.

The classification allows three different types of materials to be identified:

  1. hydro- and windproofing membranes;
  2. hydro- and vapor barrier films with different properties;
  3. steam -permeable roll materials that contribute to heat saving.

There are multiple ways to execute each kind of isospan. Everybody has the letter marking, which makes decisions easier at the point of sale and makes it easier to determine how one piece of material should be used over another. More thorough instructions can be found in the usage guidelines.

Vapor -permeable membranes for waterproofing and wind protection

A non-woven canvas membrane that forms vapor-permeable barriers for waterproofing is intended for external use in thermal insulation projects involving walls and roofs. The material is capable of shielding the insulation from the effects of wind and precipitation and does not allow moisture to pass through.

Apart from providing insulation waterproofing, the diffusion membrane also serves another purpose by preventing moisture and steam from penetrating the fibrous heat insulator through the building walls. The fungus does not pose a threat to wooden structures because the steam is swiftly expelled outward, and the insulation retains its ability to insulate against heat.

Polypropylene is used to make diffusion membranes. Their application keeps fungi from growing and is safe for human health.

Range of application:

  • insulation of the pitched roofs with an angle of inclination over 35 °;
  • construction of frame houses;
  • external wall sheathing with siding or lining;
  • Hydro- and wind protection of the heat insulator under the ventilation facades.

Isospan a, am, as, aq Proff, a with OZZ

The range of vapor-permeable membranes for hydraulic protection comprises non-woven materials with different densities:

  • Isospan A (density indicator 110 g/m 2) – The most permeable membrane from the entire line, gives moisture to go outside, but does not let it inward. When installing it, it is necessary to leave a gap for ventilation.
  • Isospan AM (90 g/m 2) – a three -layer membrane. The technical characteristics of isospana AM allow you to mount the protective hydro- and wind-decisions without a ventilation gap, since the air circulates between layers of the material and removes moisture.
  • Isospan AS (115 g/m 2) – also three -layer diffusion non -woven material, but compared to AM, a denser.
  • Isospan AQ Proff (120 g/m 2) – Professional material. Isospan AQ PROFF has a three -layer structure with enhanced reinforcement. It is recommended to use the isospan AQ PROFF if the walls insulated outside or the roofing system will have to be left without an external protective-decorative coating. Features of isospan AQ Proff – increased resistance to moisture, ultravioletus, mechanical damage.
  • Isospan A from the OZZ – from isospan and the material is characterized by the presence of fire retardant additives. A non -combustible membrane is used if it is supposed to carry out welding in the immediate vicinity of the insulated structure, for example, when installing ventilation facades.

Two or three layers make up microporine membranes. The material quality on the front and back differs, which is one of their distinguishing features. There is a smooth side and a rough side. When it comes to membranes such as AQ PROFF, AM, and AS, the white side lays the hydro-protective isopan to the insulation.

In this instance, the diffusion barrier is isospan A, and as per the instructions, A from the OZZ is mounted with its smooth side facing outward. Condensate that has accumulated on it should flow into the drainage drain.

Hydraulic protection and vapor barrier films

The vapor barrier film and hydraulic protection are intended for indoor installation. It serves to shield the moisture structures and insulation, which increases the thermal insulator’s thermal conductivity and contributes to the decomposition of metal and wood.

If installed correctly, the use of films that do not pass steam and condensate prolongs the life of building structures and insulation.

The range of vapor and hydro barrier films

  • arrangement of the base of the sexes;
  • Installation of the insulated roof (protection of material insulating a flat or pitched roof);
  • insulation of the enclosing structures from the side of the room, sound insulation of the partitions;
  • protection of ceilings – basement, intert -based, attic (serves as a waterproofing barrier);
  • Laying wood -containing or wooden flooring (parquet boards, flooring, laminate).

Isospan b, C, D, DM, RM, RS

The manufacturer provides a large selection of materials that act as waterproofing and vapor barriers.

Each variety of isospan has a unique density and function.

  • Isospan B (density indicator 72 g/m 2). Steamed isospin B is among the most popular types of material due to the characteristics and affordable price. With its help, vapor barriers are internal walls, a ceiling with basement and inter -story floors, attic and attics under a warm roof.
  • Isospan C (90 g/m 2). Concrete floors are waterproofed by film. The material is laid to protect the heat insulator on the pitched roofs.
  • Isospan d, dm (105 g/m 2). Isospan d and dm – varieties of material of increased strength. Mark DM has an anti -condensate surface. Isospan d, DM is designed for high loads. Isospan D and DM is primarily used for waterproofing a flat or pitched roof. The material is suitable for operation as a temporary roofing. Isospan d also helps solve issues with a concrete floor or a basement if the structures require reliable protection against moisture.
  • Isospan RS (84 g/m 2), rm (100 g/m 2). Like Isospan D, these varieties of the film are characterized by high strength. In particular, it is achieved due to the three -layer structure of the isospan RS and RM – in the middle there is a polypropylene grid. The use of Isospan RS and RM- the arrangement of hydro- and vapor barrier for the ceiling, wall structures, floors, ceilings, for a roof of any type.

Among all the roller materials in the brand, Isospan D, C, B, RS, and RM are the most well-liked due to their broad range of applications and technical attributes.

Like other group members, isospan d has two outer layers, each of which serves a distinct purpose. While the second surface is fibrous and rough, the first is smooth. The exterior’s roughness adds to the material’s ability to retain and disperse settling steam and condensate, allowing it to evaporate rapidly.

When high-strength canvases (Isospan D, RS, and RM) are manufactured, they are treated with substances that repel water. When installing cement screeds on a concrete base for wet rooms or earthen floors, hydrophobic material works well as a waterproofing layer.

A smooth surface is required for the warming material when installing the vapor barrier and laying isospan. Moisture removal can be ensured by providing a 40–50 mm ventilation gap, depending on the structure’s operating conditions.

Heat-refracting steam-waterproofing materials

Isospan is highlighting films that have an aluminum coating applied by shopping (spraying) separately among the materials. The capacity to reflect heat radiation is one of the characteristics of foil materials.

Inside the rooms, foil film is used to boost the energy efficiency of the insulation and to form a steam-hydro-insulating barrier to safeguard the heat insulator. The foil material will shield the insulation from weathering and precipitation when installed outside.

Isospan FB, FD, FS, FX

The foil materials in the group have a structure that can significantly lower the amount of heat loss from heated rooms. Materials with labeling are specifically used for operating fb, isospan fs, isospan FD, and isoospan FX, which are chosen based on the properties of the base and coating.

  • Isospan FB (density indicator 132 g/m 2). The basis is a thin building cardboard of high density. Isospan FB from the outside is equipped with an aluminum spray. Scope of use – skin and walls sheathing in saunas and baths. Isospan FB is able to detain up to 90% of thermal rays.
  • Isospan FD (132 g/m 2). This is a woven base of polypropylene on which a layer of aluminum is applied on one of the sides. Isospan FD allows you to create a protective barrier on the ceiling and floor of the attic, used to arrange a warm floor, water or electric system.
  • Isospan fs (92 g/m 2). The basis of isospan FS is made of non -woven canvas, on top of which foil is applied. Isospan FS is a rolled material that is not afraid of moisture, durable and convenient in installation. Used as roofing heat and vapor barrier for inclined roofs, as well as for frame walls.
  • Isospan fx (145-175 g/m 2). Isospan FX has a foamed polymer base 2–5 mm thick with aluminum coating. Isospan FX can be used as an independent heat insulator or mounted in combination with insulation of other types. The scope of use- heat-reflective, hydro- and vapor-permeable sheathing of walls, ceilings, attic. It is also laid as a heat -refracting substrate for the laminate.

Materials such as FB, FS, FD, and FX are laid out as directed by the instructions, with the foil’s heat-reflective side facing the room.

Installation of hydraulic protection and vapor barrier on warm-upsurous roofs

The isospan of brand A is used due to the material’s technical specifications, which include wind protection and waterproofing for the insulated roofing roof. You must compute the area of each stingray as well as the quantity of rolls in order to determine the amount of material needed.

The following instructions are used to lay isospan for waterproofing the roof (you can choose between brand A and comparable types of material, such as AM, AQ PROFF):

  • At the preliminary stage between the rafters, fibrous heater slabs are inserted.
  • On the wooden roof frame on the outside, a waterproofing roll material should be put – horizontal stripes, starting from below.
  • It is important not to confuse which side to lay the isospin to the insulation – put the waterproofing on the insulation with the white side without inscriptions.
  • Laying is carried out with an overlap of the upper strip to the lower 15–20 cm, without tensioning the canvas, but also avoiding sagging – otherwise, with a strong wind, the material will make noise.
  • In the process of laying, the material is fixed to the rafters with brackets using a construction stapler.
  • The upper strip in the ridge part is mounted with the bend on the second slope, the instructions for the use of isospan is indicated that it is advisable to avoid the docking of the paintings in the riding part of the pitched roof.
  • Rails are stuffed on the rafters to create a ventilation gap (the thickness of the rails – 40-50 mm) so that the air flows contribute to the removal of moisture from the insulation layer. A self -adhesive sealing tape is pre -adhesive under the slats, in the future, a crate for a roofing is mounted on them.
  • All joints and adjacents of the waterproofing material to structures are glued with a mounting ribbon for sealing.

The operation manual stipulates that there must be a ventilation gap between Isospan DM and the insulation if it is chosen as the waterproofing barrier for the insulated pitched roof. Counterates can be stuffed onto the rafters to achieve this. Additionally, the roof skate needs to have ventilation holes.

To prevent moisture from damaging the fibrous heat insulator-insulated pitched roof, the attic or attic room must have a high-quality vapor barrier. You can use the brand’s vapor barrier film or RS for these purposes, or you can select the appropriate foil material.

Think about how to install vapor barrier barriers correctly by following these guidelines:

  • Film of the isopan of the brand B, RS has a smooth and rough side. It should be laid out with a smooth surface to the heat insulator, and roughly – towards the room. When laying, the canvases are placed horizontally, overlapping, gluing seams with a special tape. The material is attached to the rafters using brackets.
  • Foil isopan It is simple in use – usually there are no questions which side to put the material, since it is clear that the metallized side should reflect thermal radiation from the heat source in the room. The canvases are overlapped (FX-all) and attached to the frame with brackets. Installation instructions require the use of aluminum tape to glue seams.

Installation of waterproofing for unscarried rock roofs

It is advised to use RM or RS as well as the stroke of the brand d or dm as a windbreaker barrier (it differs in an anti-condensate surface) to shield the wooden elements of the unscarried roof frame from precipitation, wind, and condensation.

AQ Proff brand vapor permeable reinforced material is recommended for complexly configured roofs or when additional roof insulation is needed.

The waterproofing material is rolled out on top of the rafters and cut to size right away because it is not necessary to insulate the roof before applying the coating. From bottom to top, the stripes are mounted horizontally using a construction stapler equipped with brackets or wide-hatted nails.

Overlap starts at 15 cm on all vertical and horizontal joints. A specific mounting tape should be used to glue joints and adjacent surfaces. To seal the fastening points, self-adhesive tape is placed along the rafters and mounted on top of the waterproofer.

In order to install roofing material on the roof, counter-rects are stacked on top beneath a continuous or sparse crate.

Which direction should a windbreaker barrier be laid?

  • in the film D, DM, RM, RS, the smooth side should be facing up to the roofing floor;
  • used in the form of a membrane waterproofer, including AQ PRFF, lay down the white side.

The configuration of the ventilation section in the roof skate is additionally required by the waterproof film D, DM, RM, or RS that is being used.

Installation of steam-hydro-insulation on insulated flat roofs

It is permissible to use the RS and C films in addition to the isopan of brand D or RM if the flat roof needs external insulation. The material is rolled out with 15–20 centimeter panel overlaps on the underside of concrete slabs. The side on which to lay has no bearing on anything.

Branded connecting tapes are used to join the bands together and affix them to concrete structures. On top are installed roofing flooring and a heater.


For anyone working on roofing or insulation projects, it is essential to comprehend isospan and its different varieties. Known for its efficacy and adaptability, Isospan comes in a variety of forms to suit a range of requirements. There’s an Isospan product made to fit your needs, whether you’re looking for moisture resistance, soundproofing, or thermal insulation.

Isospan products are known for their high performance in a variety of weather conditions, lightweight design, and ease of installation. Isospan is a well-liked option for both builders and homeowners because of these features. Any roofing or insulation job benefits greatly from its capacity to increase energy efficiency and offer durable protection.

The manufacturer’s instructions must be followed when using Isospan in order to get the best results. When installation is done correctly, insulation maximizes its effectiveness and durability and works as intended. Paying close attention to details during installation is essential to creating a seamless and effective insulation barrier, regardless of whether you’re installing Isospan panels or rolls.

To sum up, Isospan is a dependable option for insulation requirements in building and roofing. Its range of varieties and advantageous qualities make it an adaptable option for boosting energy efficiency, weatherproofing, and raising general comfort levels in buildings. Through comprehension of its varieties, attributes, and appropriate application guidelines, you can with assurance select Isospan for your subsequent undertaking, guaranteeing excellence and durability in your roofing and insulation pursuits.

When investigating Isospan for roofing, it’s critical to comprehend its different varieties, distinct qualities, and efficient application. Isospan’s adaptability and insulating qualities make it unique in the roofing sector. This article explores the various varieties of isospan that are available, emphasizing their advantages and ideal uses. It also offers helpful guidance on how to install Isospan correctly, guaranteeing maximum longevity and performance for your roofing requirements. Whether you’re a contractor looking to explore new materials or a homeowner contemplating a roof upgrade, understanding Isospan’s subtleties will greatly improve your roofing projects."

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Alexander Sorokin

The owner of the roofing company, an expert in the roofing markets. I'll tell you about the novelties of the roofing industry and help you choose the best option for your home.

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