Insulation dowels and frame anchors

About this section: Insulation dowels and frame anchors

Tech-KREP facade fixings hold the insulation to the wall and carry the load of a ventilated facade into the base. The section has three types of product. IZL-T and IZO disc dowels press the wool or polystyrene slab to the wall: the 60 mm disc does not tear the slab, and the polyamide thermal head creates no cold bridge. TSX-500F facade anchors fix ventilated-facade brackets, railings and exterior windows where an ordinary dowel will not hold; TSX-500 is meant for dry rooms indoors and TSX-S for light and medium loads. RD plugs with a wide spiral thread are made specifically for aerated and foam concrete.

The most common mistake when ordering insulation dowels is the wrong length. It is worked out like this: insulation thickness, plus a 10 mm adhesive layer, plus anchorage into the wall of at least 50 mm in concrete and solid brick, 70 mm in hollow brick and 90 mm in aerated concrete. For 100 mm of wool on brick that comes to 160–170 mm; for 50 mm on concrete, 110 mm is enough. The dowel calculator picks the length for you — it only needs the insulation thickness and the wall material. Consumption: 6 pieces per square metre in the main wall field, 8 in the edge zone (1–2 m from the building edge), where the wind load is higher, and 12 above 25 m.

The TSX-500 anchor comes with two screw coatings. The electro-galvanized TSX-500 suits dry rooms indoors and temporary structures, while the thermal-diffusion TSX-500F holds outdoors without rusting — take it for ventilated-facade brackets, railings and damp rooms. The anchor length is chosen as bracket thickness plus 60–80 mm of embedment.

All fixings are sold in packs: IZL-T dowels in 400–1000 pieces depending on length, anchors in 50–250. The quantity per pack is shown on the product card. Disc dowels and retaining washers can be ordered in one order together with the wool and mesh from the neighbouring sections.