Izospan application, properties and characteristics

Izospan application, properties and characteristics Izospan vapor barrier - specifications and photos

Roof covering is a very important element for building a home or even any other building. The roof will perform the function of protection from precipitation and sun rays. We will consider the varieties, technical characteristics of Izospan vapor barrier - one of the most popular on the domestic market.

Izospan is used for roof insulation, and also for protection from moisture that accumulates due to the presence of air flows inside the room.

If you do not take care of the protection of the roof, and then the water will gradually accumulate, and eventually this will lead to the destruction of the insulation system.

General information

Why waterproofing is required

This will cause the building to become cold, and insulation will be required replace. But in order for Izospan to be able to show its best qualities, it is required to prepare for the installation of a protective layer. Before starting the procedure, you need to make sure that there are no joints and gaps in the insulation. As a result, you will have a high-quality insulating layer of the system, which does not allow vapors to penetrate from the room and protect the roof from precipitation.

Izospan vapor insulation - technical characteristics

In the manufacture of the membrane, modern technologies are used, due to which Izospan received these advantages:

  • Environmentally friendly composition.

  • Price.
  • UV resistance from direct sunlight.
  • Resistance to temperature changes.
  • Resistance to atmospheric precipitation.
  • Easy to install.

  • Fire resistance.
  • High tensile strength.
  • Possibility of using in various fields.
  • Waterproof.

Next, consider the types of Izospan.



There are several types of Izospan, which are marked with letters. Each species will be designed for its specific application and has specific functions and characteristics.

Izospan A

Such membranes make it possible, on the one hand, to release steam so that moisture does not accumulate in thermal insulation, and on the other, Izospan makes it possible ventilate the insulation. And moisture from the street, which causes condensation, and the wind cannot get inside the structure. The opposite side of the membrane is waterproof.

The best method to extend the operational life of thermal insulation is to install Izospan membranes, which, due to their waterproofing properties, protect the insulation from wind and moisture.

Regardless of the quality of the insulation itself, under the influence of the atmosphere, it will begin to quickly lose its qualities. The installation of such a tool should take place taking into account the basic rules, and there are three of them:

  1. The angle of the roof slope may exceed +35 degrees.
  2. Installation of the membrane is mandatory in dry and calm weather.
  3. An air gap is required, which is created by the control rails that are installed on the rafters.

Due to the fact that Izospan A works according to the check valve method, the membrane must be installed outside the insulation. The smooth side must look outward. The membrane should be laid in wide overlapping strips on the next layer.

Now let's talk about the roof of the vapor barrier. Which side to lay Izospan on? Steam insulation is carried out starting from the bottom.

Izospan A installation has one extremely important condition - it is impossible for the material to come into contact with the thermal insulation. In the opposite case, the waterproofing film properties will be greatly reduced. As an example, you can cite a tarpaulin tent, which, if it rains, will leak in those places where a person runs a finger from the inside. To prevent such a situation, Izospan A should be laid with a double crate. When laying Izospan, it is imperative to ensure that various swelling and sagging does not occur, which can become a source of an unpleasant odor in a gusty wind.

The fastening of the canvases is possible by means of a thin strip.

Izospan B

Izospan application, properties and characteristics This type of roof waterproofing Izospan is required to protect against internal vapors. Variety B is made of two layers - with a fleecy and a smooth structure. the first is used to absorb the accumulating condensate, and the second is used for better bonding with the insulation. Film type B insulation from steam is used for wall insulation, roofs, and also for floors inside buildings.

Such a tool is considered universal for protection against condensation. Due to the structural features of Izospan B, it should be laid with the fleecy part down, and it is also necessary to maintain a gap for collecting the resulting condensate and airing it out. Membranes must be overlapped with an overlap of more than 10 cm.

Izospan S

This type of insulation is made of two layers, which are identical to Izospan B - the first has a smooth surface, and the second is fleecy. Izospan S is used to prevent the accumulation of condensate by absorbing moisture particles inside the room.

The area of ‚Äč‚Äčapplication will be identical to the membranes of variety B. Izospan C can perform the following functions:

  • Roof protection.
  • Steam and moisture isolation.
  • Protection of concrete and wood elements from water.

But one should also take into account the fact that Izospan S is characterized by a high degree of membrane density, and for this reason the price of the canvas is approximately 50% higher than that of Izospan B.

Izospan D

The material is very durable and also completely waterproof. The canvas is one-sided and it is a laminated coating. Due to its distinctive feature, Izospan D has a wide range of applications in any design type.Izospan D is used as a barrier that does not allow condensate to collect under the roof. Often used on construction sites for temporary roofing.

It is mounted when installing concrete blocks, which must be in contact with the ground.

This type of membrane can cope with the most difficult tasks:

  • Waterproofing the floor that is in contact with the ground.
  • Insulation of the basement overlap.
  • Creates a temporary roof type.

Also, the membrane is able to withstand moderate loads of the mechanical type without any problems, and due to this, a large load from snow cannot damage the material.

Type D is the most reliable and durable option, but keep in mind that the cost will be much higher.

The latest developments - energy-saving materials

There are modern Izospan films that are produced with the FB, FD, FS and FX markings, which, due to their unique features, are capable of reflecting up to 90% infrared type of radiation. Insulation is a sure-fire method to protect the roof from steam, moisture and wind, and this saves energy costs for heating the building. Izospan FD and FS is developed on the basis of a polypropylene double film. In the manufacture of FX, foamed polyethylene is used, and to create FB, kraft paper is needed.

All these types will have a common element 0, the metallized side, which is used as a reflective screen, which is often found when creating a warm home. such use of reflective surfaces can be found:

  • In saunas and baths.
  • As a lining for insulated floors.
  • When installing slabs.
  • For wall cladding (behind radiators or radiators).

You can also find other types of membranes that are made for certain areas of construction - AM, DM and AS.

Instructions for laying the product on the roof

Izospan application, properties and characteristics Instructions for using Izospan extremely is important, since the correct installation of Izospan will directly affect the quality, as well as the duration of its use. Each of the nuances and stages of installation is extremely important and required for accounting. A separate instruction is attached to each type of Izospan. It is according to it that type A should be installed on the outer part of the insulation, and for this it should be cut into strips that will overlap each other.

During installation, sagging and swelling should not appear on the film.

This will be an indicator of poor-quality membrane installation. The canvases can be temporarily attached using a construction stapler, but only on condition of further installation on a structure of canvases. Reiki should be treated with antiseptic compounds. The membrane on the fleecy side must be with a gap of 5 cm, which is required for weathering moisture and condensation.

The first vapor barrier sheet must be installed so that water can enter the drainage system.Only after that the builder can proceed to the installation of the lathing. If you plan to use non-Izospan D, then the flooring should be completed in a short time, since these types of membranes are not intended for use as a temporary roof replacement. Only Izospan D is suitable as a temporary roof due to the increased level of density.

Expert advice

Steam insulation of a building must be approached with full responsibility.

The reason for this will be the catastrophic consequences of a mistake that a builder is capable of making. The fact is that after the liquid evaporates (which happens in the bathroom or in the kitchen), and it enters the insulation, due to which that layer will lose its performance. mold, high humidity of rafters, freezing of the roof and everything else can wait for the owner of the house.

Experts recommend taking into account certain nuances when laying Izospan and its similar products:

  1. Before starting installation work on vapor barrier, you need to read the instructions for the membrane , because when using materials of type A, B and C, fixation is allowed only indoors, and otherwise the required qualities will be lost.
  2. If the installation is carried out on the roof of the attic room, and then counter-rails will be required that will perform two functions at once - the interior decoration should be laid on it and the tightness of the insulating joints and rafter legs should be ensured.

  3. If we talk about Izospan AM, then it can be laid on either side, and most importantly, the layer should be laid on the insulation.
  4. The material should not be stretched during installation, the presence of holes and other defects is also not allowed.
  5. The vapor barrier sheet must be installed on the gables or other slopes, and therefore an allowance of at least 15 cm is required.

Correctly carried out installation of the Izospan roof vapor insulation is extremely an important condition for protecting the house from the effects of the atmosphere.


Properly installed roof insulation from liquid and vapor allows the building to last as long as possible.

One of the options for isolation would be Izospan vapor barrier, which has excellent performance. The product will be characterized as inexpensive and of high quality, which makes it one of the best ways to protect the roof.