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Keystone
Description

Cast stone keystone. Integrated into a window head or placed on its own above a window, a keystone adds some architectural flair to a building’s facade.

Standard designs available, all of which can either sit alone above a window or can be built into the window head. Bespoke keystones to meet individual requirements.

Material:

- Haddonstone (Semi-dry cast limestone):

High quality semi-dry cast stone, consisting of over 50% limestone aggregate. With a surface texture similar to Portland Stone, Haddonstone is regularly used alongside or as an alternative to natural stone.

- TecStone (wet cast limestone):

High quality wet cast stone, comprising over 60% natural limestone aggregate. Denser than the Haddonstone material, TecStone is acid etched as standard to provide an attractive appearance similar to a finished natural stone. Designed to meet demanding performance criteria and can incorporate structural reinforcement and cast-in fixings. TecStone is the preferred material for architectural projects where structural performance is required.

General information

Material

Haddonstone (semi-dry cast limestone)

TecStone (wet cast limestone)

Uniclass 2015

Pr_20_93_52_13 Cast stone masonry unitsPrimary

CAWS

F22/110 Cast stone

F30/770 Cast stone dressings laid in cement gauged mortar

F30/771 Cast stone dressings laid in hydraulic lime:sand mortar

Specification data - Cast stone masonry units

Product Reference

Keystone

Type

Q900

Q920

Bespoke

Insert requirement.

Material

Haddonstone (semi-dry cast limestone)

TecStone (wet cast limestone)

Colour

Bath 02

Ivory Limestone IL

Portland 01

Bespoke

Insert requirement for colour.

Accessories

None

Cast-in fixings

Insert requirements for cast fixings.

Cast-in lifting sockets

Insert requirements for lifting sockets.

Standard product features

Compressive cube strength after 28 days (minimum):

  • Haddonstone: >35 MPa.
  • TecStone: >45 MPa.

Both materials exceed the requirements of the United Kingdom Cast Stone Association (UKCSA) specification and comply with the requirements of BS 1217, BS 5642-2+ A1 and BS EN 13198.

Haddonstone:

  • Material density: 2150 kg/m³.
  • Compressive strength: Minimum compressive cube strength at 28 days is >35 N/mm² (MPa).
  • Aggregate size: 0–3 mm continuously graded.
  • Finish: Ex-Mould (no finishing required).
  • Freeze/ thaw resistance: Complies with UKCSA Standards so products deemed freeze/ thaw resistant.
  • Handling reinforcement: Where appropriate units may contain one or more stainless steel, synthetic fibre or extruded basalt reinforcement bar (30 mm minimum cover).

TecStone:

  • Material density: 2350 kg/m³.
  • Compressive strength: Minimum compressive cube strength at 28 days is >45 N/mm² (MPa).
  • Aggregate size: 0–10 mm continuously graded.
  • Finish: Light acid etched.
  • Freeze/ thaw resistance: Complies with UKCSA Standards so products deemed freeze/ thaw resistant.
  • Handling reinforcement: Where appropriate units may contain one or more stainless steel, synthetic fibre or extruded basalt reinforcement bar (30 mm minimum cover).

Product Options

Type:

  • Q900 - 120 x 310 x 230-150 mm.
  • Q920 - 127 x 290 x 230-128 mm.

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