Mineral wool insulation materials, Airtightness systems and Green roofs – We offer you solutions of the highest standard.
Do you already know our formaldehyde-free binder ECOSE ® Technology?
You have questions, suggestions, wishes? We look forward to hearing from you.
From the basement to the roof: We offer solutions for all application areas.
Knauf Insulation worldwide
Mineral wool insulation materials, Airtightness systems and Green roofs – We offer you solutions of the highest standard.
Do you already know our formaldehyde-free binder ECOSE ® Technology?
You have questions, suggestions, wishes? We look forward to hearing from you.
From the basement to the roof: We offer solutions for all application areas.
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How to perform airtightness layers and that they have to be permanently functional is governed by DIN 4108-7. What exactly means “permanently” and how durability is tested, is now regulated in part 11 of DIN 4108. Craftsmen can now finally be sure that a product for airtight layers also delivers what it promises.
Airtightness is crucial for the function of an insulating layer, as it prevents drafts from carrying away the precious heated room air. In addition, it protects the building fabric against moisture damage, which can be caused by unhindered penetration and condensation of humidity. How to perform airtightness layers and which materials are suitable has been regulated since 2011 by the airtightness standard DIN 4108-7. It also demands the durability of the chosen solutions. But what minimum durability requirements apply has not been defined yet.
This is where the new Part 11 of DIN 4108 of November 2018 with the title “Minimum requirements for the durability of adhesive bonds with adhesive tapes and adhesives for the production of airtight layers” begins. It explains once and for all what durability in terms of airtightness actually means exactly. Adhesive tapes and sealing adhesives can now be put through their paces with various test setups. In particular, their peel strength, so the strength of the adhesive bond is taken under the microscope. For the assessment, minimum values have been established on two defined substrates – beech wood and polyester film. In the test itself, the adhesive bonds, for example, foil on wood or foil on foil, among other things loaded with weights. The whole thing is done not only under normal conditions, but also after an artificial aging process in a climatic chamber.
The results of these and other test methods finally allow statements about the suitability of the products as airtightness solution. Incidentally, the adhesion shortly after contact with the adhesive surface plays no role in the tests. Adhesive bonds can only be assessed if the adhesive has had time to work its way into the surface. This is bad news for so popular on construction sites test of “adhesion” with the thumb on the adhesive surface.
Thanks to the new Part 11 of DIN 4108, craftsmen can now be sure that the products they have selected are also suitable for producing an airtight layer – provided that they have been tested in accordance with DIN 4108-11. Liability risks can be minimized and customer satisfaction increased. Of course, the Knauf Insulation air tight insulation system LDS is also tested according to the new DIN 4108-11. At the same time, the test spectrum is even extended by additional substrates – for example, all the films in the system.
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