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Head Restraints

Head Restraints

Ancon Head Restraints provide the necessary restraint to the top of masonry walls. They allow for vertical movement to accommodate shrinkage or thermal movement of the wall or structural frame, while restraining wind loads.

Ancon IHR – Internal Head Restraint

The Ancon IHR is used for restraining the top of internal walls or the top of the inner leaf of a cavity wall.The channel stem is closed at the front to prevent mortar ingress and to ensure that vertical movement can take place between the blockwork and the structure.

The standard Ancon IHR suits a 190mm high block and accomodates a gap of up to 50mm with other lengths available to order.

The sliding top section is provided with a slot (IHR-V) to suit M8 bolts. Other top sections are available to order including a hole (IHR-B), with a notch end to fix directly into a 38/17 or 30/20 cast-in channel (IHR-C), and to suit the SDTSS-38-5PT self tapping screw (IHR-S).

Example IHR Specification

(Delete/Amend as appropriate)

Ancon IHR-V / IHR-B / IHR-S / IHR-C30 / IHR-C38 internal head restraint to suit a 190mm block and a 25-50 / 51-75mm gap.

IHR-V

IHR-B

IHR-C

IHR-S

Design Resistances for IHR Range

Design Resistances
Product ReferenceSpacing25mm Gap50mm Gap75mm Gap
IHR-B, IHR-V, IHR-C and IHR-S 900mm 1.78kN/m 1.22kN/m 1.06kN/m
450mm 3.56kN/m 2.44kN/m 2.11kN/m

Ancon FHR – Head Restraint

The Ancon FHR Head Restraint is used for restraining the top of internal walls or the internal leaf of a cavity wall. The two angles clamp the top of the wall and have 10mm diameter holes to suit M8 bolts. Each restraint provides a design resistance of 1890N.

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