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Insulation anchoring

In the case of anchoring of the thermal insulation system it is necessary to build according to project documentation. The number, type and length of the expander anchors depend on the properties of the substrate and must be determined by static calculation based on the tested load capacity of the expander anchors.

Mechanical anchorages are recommended after a construction break of min. 24 hours after the insulating boards are glued on. Exceptions are the Baumit StarTrack adhesive anchors, which fit before joining the thermal insulation boards.

Substrate category

Kategória podkladu pre kotvy

Each certified anchor has a label for the category of the substrate, that is, the substrate for which it can be used. Categories are marked with letters A, B, C, D, E.Always use a screw anchors for cavernous masonry elements.For mineral insulating boards, use anchors with steel thorn.


A – concrete
B – full of bricks
C – hollow bricks
D – light concrete
E – aerated concrete

Layout and number of anchors

The number of anchors must be determined by static calculation. The recommended minimum number of anchors is 6 pieces per 1 m2.The diagram of the anchor spacing depends on the number of anchors and the type of insulators. For basic anchor layout schemes, can be found in the technical details in the anchor section.

Method of anchoring

Adhesive joint, adhesive anchors

Kotvenie zateplenia pomocou lepiacich kotiev
  • For EPS insulating boards
  • For new buildings and renovations
  • Without thermal bridges, they eliminate the drawing of anchors on the facade

Countersink installation

Zápustná montáž kotiev na zateplenie
  • For different types of insulation boards thickness from 80 mm
  • For new buildings and renovations
  • Reduction of thermal bridges at anchorage

Surface mounting

Povrchová montáž kotiev
  • For different types of insulating boards
  • For new buildings and renovations

Without anchoring

Zateplenie bez kotvenia_novostavba
  • For new buildings, for clean un-plastered masonry with max. 2 above-ground floors (max. height 10 m)
  • For EPS insulating boards up to a thickness of 20 cm
  • For mineral fiber-insulating boards with perpendicular fiber, so called lamellas up to a thickness of 120 mm
  • No risk of drawing anchors on the facade

How to calculate anchor length

New building, un-plastered masonry

Required anchor length = d1 + d2 + 10 mm (thickness of adhesive mortar) d1 –the minimum anchor length in mm is stated on the anchor or in the technical sheet of the anchor


Required length of the anchor = d1 + d2 + d3 + 20 mm (thickness of adhesive mortar)

d1 - minimum anchor length in mm is stated on the anchor or in the technical sheet of the anchor

d2 - thickness of the insulator in mm

d3 - the actual maximum thickness of the masonry plaster

Our tips

  • The drilling hole for anchor installation is made perpendicular to the surface of the substrate.
  • The bit diameter must correspond to the diameter of the anchor.
  • Mineral wool thermal insulation boards (MW) must first be punctured by a drill and then drill the hole.
  • Holes without impact must be drilled into highly porous building materials (eg aerated concrete) and hollow building materials. In the case of concrete or full bricks, a drill with a hammer.
  • The hole for the anchor must be mined by min. 10 mm deeper, respectively. 25 mm for countersunk anchor mounting, such as the actual anchoring depth of the anchor, unless otherwise stated in the manufacturer's technical documentation.
  • Anchors must be installed at a distance of min. 100 mm from the edges of the walls, ceilings, window and door openings or expansion joints.
  • After installation, the plate of the spacer may not disturb the flatness of the thermal insulating, reinforcement layer. The anchor plate should not be installed more than 10 mm in thermal insulation (not applicable for countersunk anchor assembly).
  • An anchor which is badly attached (not firmly anchored to the substrate) or damaged, must be replaced by a new splinter armature that is adjacent to it.
  • If possible, a badly installed anchor should be removed, if not, the anchor should be adjusted so as not to disturb the flatness of the thermal insulation system. The hole formed in the thermal insulation plates after the anchor is removed must be filled with heat insulating material.