Which Izospan is better for the roof - varieties
The problem of combating condensate that is collected on roof insulation , very ideal for modern buildings. The better the thermal insulation of the roof and the less drafts in residential buildings, the more water vapor gets under the roof space. For this reason, Izospan for roofing is as important as high quality waterproofing or an external protective covering made of slate, metal or bitumen sheet.
Izospan - what is it for modern construction. Previously, the word that denoted a specific brand and product variety has now become a household name,
which means a thin sheet of polypropylene fibers with a special structure, used as a lining material in a roof structure.
The task of the material is to perform the following functions:
- Providing waterproofing for the roof.
- Cutting off and filtering water vapor from the insulation layer.
Moreover, the canvas successfully retains part of the warm masses of air and steam in the volume of the under-roof or attic space, and so convection will be blocked, that is, Izospan will not allow sharp gusts of wind and drafts to blow out heat from under the roof. Naturally, the main task of the vapor insulation for the roof will remain to cut off the vapors and prevent their condensation from the side of the roofing pie fastening part.
Please note that at least 10 kg of water vapor is generated in a house with an area of 60-70 square meters during the day.
If you use gas stoves, then the volume of water that appears in the air can become 2-3 times higher.
If we take a roof area of 100 squares, then per day on each square meter of insulation that is not covered with roofing materials, a film of water condensation with a thickness of 0.01 cm falls out.This means that after 70-100 days, mineral wool insulation will be filled with moisture by 10-15% and its heat-insulating properties will decrease by 40%. Naturally, the given example of how important the material is in the role of hydro and steam insulation for the roof is very schematic, but it clearly shows how serious the problem of combating heat loss and watering can be.
Moreover, in modern construction, many different schemes are used for arranging and insulating a roof, and therefore an Izospan roofing film with different parameters and properties will be required.
Of a very large number of varieties and types of films and under-roof panels in the arrangement of the roof in in a country house, in back rooms, and indeed in any room where there are sources of heat and water vapor, the following brands are considered the most popular and often used:
Please note that in this case the classification and subdivision of the protective cloth is made on the basis of the technical specifications and parameters of the trade mark, produced by the Russian company "Hexa - Nonwovens".
Besides Izospan from "Geksa", there are many similar materials on the market. its products are constantly undergoing tests, laboratory research and production quality control.
judging by the number of various awards and recognitions in the TOP list of roofing materials, the quality of Izospan for roofing, which is produced under the control of "Hexa - nonwovens", remains at the proper level. Although in the classification of a foreign type, the presence of certificates and diplomas is not recognized as an objective evidence of the level of quality.
In order not to get lost in a large number of different brands of Izospan and similar films of vapor insulation, you need to focus on the indexes in the form of letters with which manufacturers label their products. Group of analogs "A" category - the canvas is marked with the indexes A, AS, AF, AM, AF +, AQ proff. This category includes all analogs of the film type, which need to be protected from moisture and gusts of wind entering the roof from the outside.
The second category is used for poorly insulated and non-insulated roof types, this is Izospan "D" assembly. Letter indices on the package - FХ, FS, or FD-FВ. In the composition of the film for waterproofing there are special layers of aluminum spraying or glued foil with high reflectivity. It is believed that the reflection of infrared waves from the inside of the under-roof space makes it possible to prevent up to 10% of heat losses through the roof. The third group - analogues "C" and "B", have a more perfect structure, high price and special requirements for laying the material under the roof.
In addition to standard films and panels in three layers, there is and is used the category of auxiliary tapes. This type of coating is used to bond the joints of individual Izospan canvases.
Naturally, the choice of the most suitable type of film for lining directly depends on the arrangement of the roofing pie and the method of using the roof. In a simple case, for roofing insulation from water and condensation, which penetrate through the cracks in the overlap of different sheets, for example, slate or metal tiles, it is possible to use Izospan type "A". It is slightly inferior in quality and tensile strength and water resistance to other brands, but it will look more beautiful in cost and styling.
Good advice! You can simplify the task of selecting an Izospan waterproofing film for a roof if you use a table comparing the parameters of different brands.
A distinctive feature of this type of material will be very high permeability to steam. It turns out that this material is best placed on an insulated roof of a room with an abnormally large amount of water vapor, for example, in a summer kitchen, on ceiling ceilings, above a bathroom, glazed covered verandas. Structurally, this material is a two-layer polypropylene film, with a smooth structure on the outside and a matte porous surface on the inside. Modification of the material due to the presence of an additional 3rd layer has increased strength and much worse steam conduction.
They can be laid on the counter-lattice surface without an underlayer and rack-type lathing.
Compared to class "A", this material has much higher waterproofing characteristics. Izospan, a film for waterproofing class B roofs, is much lighter than the "A" sheet, is almost 2 times thinner, which means it has a lower degree of strength. It is more convenient and flexible for creating insulation, both under-roof space and other floors, including vertical walls, ceilings, subfloors, parquet and laminate coverings. In the table you can see that the vapor permeability "B" is two times lower than that of the material "A".
For this reason, it is better to use the waterproofing of the "B" - Izospan roof on broken complex roofs, with a large number of joints and "playing" coating, where there is a very high risk of waterlogging.
About half roof coatings in private houses are equipped without insulation. Household blocks, garages, saunas and unheated outbuildings for a house most often receive a roof without additional insulation. In this case, Izospan C can be used for a cold roof. According to the characteristics of the mechanical type, thickness and strength, the material corresponds to category "A", but in terms of water vapor transmission, it can be considered permeable to water.
Class "C" cloth is distinguished by its ductility and high elongation, and therefore is considered the best backing material for laminate. Canvas "D" is unique in its own way. If you look closely at the characteristics, you can make sure that this is a very durable polypropylene canvas. Which is the best Izospan for the roof? "D" category is used for a large insulated roof on very steep and large slopes, where there is a possibility of damage to the waterproofing layer due to the deflection of the rafters or the crate subsidence.
Basically, it is a two-layer, durable material with a laminated outer surface that can withstand direct water currents.
The resistance is so great that class "D" can be used for waterproofing basements of basement building elements and even formwork cladding. If there is a need to protect a box from a profiled beam or an unfinished building, then a temporary roof from Izospan "D" would be an ideal option. It will not be torn by wind gusts, and after construction is completed, the material can be carefully transferred to equip the roof or insulate the basement space under the house.
How does Izospan fit onto the roof? The quality of waterproofing will fully depend on how well the installation scheme is selected and the film is professionally installed. The work on fixing the membrane for waterproofing under the roof is not difficult and is quite accessible for even beginners in roofing.
So, when installing any type of Izospan, it is necessary to check the "polarity" of the packing, namely, that each panel should lie on the top with the smooth side while fluffy or porous downward. Moreover, the material does not need to be tightened too much, firstly, the installation is carried out on a frame made of wood, which is subject to shrinkage and deflection, and can easily tear the material off the roof. Secondly, if there is a suspicion that the film may break off the staples, you can always use cardboard heel pads or glue the attachment point with tape.
Izospan for roofs are in ever-growing demand. For this reason, the biggest problem that will have to be faced when using a waterproofing film is the presence on the market of a large number of fakes of branded material.
It is better to buy a film for the roof yourself, because even most construction companies do not hesitate to use counterfeit material.
( 2 marks, average 3 of 5 )
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