Bauschaum - which durability can be calculated?

Building foam is used in the construction of houses and in many other areas on a very large scale use. Again and again, the question arises as to how durable a seal of joints or gaps with construction foam in practice is - and when it comes to defects in the seal. An answer to this can be found in this post.

Factors for durability

For PU foam, one has to look at the durability under different aspects. On the one hand it is about the resistance of the material itself, on the other hand also plays a role, to what extent the foam-filled waterproofing still preserves its original insulating value.

Harmful effects on the material

It is important for the durability of the material itself that the construction foam is safely protected against UV radiation (ie sunlight). PU foam is extremely sensitive to UV radiation. In this case, it would decompose very quickly (usually only a few days!)

On the other hand, PU foam is resistant

  • Water and moisture
  • alkalis
  • Oil and gasoline
  • most solvents (but not against all)
  • Pressure and abrasion
  • rot
  • Rot

In most cases, polyurethane foam does not need to worry about the durability of the material in modern foams. Older products that were used a few decades ago, however, are not always so durable - here it can happen that windows and doors are no longer sealed or held particularly well. This is not to be expected with modern products.

Influence of heat and cold

PU foam is generally quite resistant to heat and cold. Temperatures in the range of -40° C to + 90° C usually do not do the foam anything. Also, frequent variations in temperature are unproblematic for the durability of the foam.

Reduction of the insulation value

The insulation value, which has a fresh foaming, can no longer fully achieve a seal of construction foam several years old. In general, however, the decrease in the insulation value is so low that it is usually unproblematic.

Tips & Tricks

Incidentally, the expiry date of the can itself is usually a best before date. This means that by that date the product is definitely 100% okay. If the best before date is only slightly exceeded, that should not be a problem. For delicate tasks (such as when installing the window) but you should use as far as possible no expired products.

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