Stick styrofoam as insulation on floor and facade on concrete

For gluing styrofoam on concrete, building material manufacturers have developed adhesive mortars that develop strong adhesive power on both materials. In addition to durability, the mortar also has the necessary properties to be used outdoors. Similar to the Styrofoam itself, the mortar is easy to work with.

Properties of adhesive mortar

Styrofoam is often attached to external and internal walls for insulation in both old and new buildings. The common feature of many masonries is their mineral nature, which bring all types of concrete, cements and many bricks.

In order to fix Styrofoam, a bridge layer must be created between the substrate and the polystyrene panels. An adhesive mortar has the advantage over adhesives with a viscous flow consistency, despite the concrete pores to adhere well. Another important feature of adhesive mortars is the following:

  • Breathable and diffusing
  • Compensating for bumps
  • Precipitation hard
  • weatherproof
  • Manually and mechanically process
  • Sufficient pot life (about two hours)

Adhesive cement is not suitable for armored plasters.

Consider fire protection

If an insulation made of styrofoam is glued, always the fire protection must be considered. For use, the Styrofoam must be marked as flame retardant. In most cases, especially indoors, additional measures such as fire barriers are necessary. They must be covered with adhesive when fastening.

For example, "sticking" any polystyrene panels with "any" adhesive mortar to a concrete basement ceiling is risky and in most cases prohibited. When the Styrofoam is glued to the wall, the surrounding materials and trim materials play an additional role in the selection and processing of mortar.

Glue moldings on concrete instead of paint or wallpaper

Styrofoam is applied to ceilings as a means of insulation and decoration. Ceiling cassettes and stucco strips should be applied to the bare concrete substrates with an adhesive mortar. This makes it possible for later transformations, by painting or wallpapering to reduce the look of the imitation and put them rather as stonework in scene. The adhesive mortar must be able to withstand room temperatures of up to sixty degrees Celsius under ceilings.

Tips & Tricks

As a guideline for styrofoam insulation boards, you should use mortar to fortify at least forty percent of the total adhesive surfaces of wall fixings.

Product Image: Natali_ua / Shutterstock

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