Architectural
Mouldings & Surrounds
Precisely cast surround, band, and trim profiles that frame openings and organize façades.
A focal point for the arch
Keystones
Cast stone keystones for arched openings, windows, doors, fireplaces, and decorative wall compositions.
Material programArchitectural precast
Applications6 starting points
Catalogue entries shown12 entries
Project optionsSize · finish · returns
Architectural
Understand the element before it reaches the drawing set.
A keystone concentrates attention at the crown of an arch. The Landmark catalogue ranges from clean tapered blocks to stepped, framed, and ornamental profiles.
Keystones can be selected from the KST series or resized and finished to align with the surrounding arch, sill, moulding, and façade palette.
Why it works
- Twenty-plus catalog profiles
- Simple and ornamental forms
- Custom sizing
- Coordinated arch surrounds
- Crisp cast geometry
- Interior and exterior use
Applications
Where Keystones belongs.
A starting point for design conversations. Project conditions, engineering, attachment, and local requirements should be reviewed for the final assembly.
01Arched windows
02Entry arches
03Fireplaces
04Garden gates
05Wall niches
06Decorative openings
Interactive catalogue
Find a reference. Check the official profile.
Search catalogue codes and keep up to three references together. The interactive 3D study explores form and finish; it does not reproduce the exact model. Use the official drawings for dimensions and profile selection.
Interactive 3D material studyKeystones
12 catalogue entries · 1 family · four digital finish studies
Building the 3D material study…
Live WebGL geometryIllustrative keystone profiles study3D form study
Choose a catalogue reference ↓Drag to orbit · scroll to zoom · use the controls for exact viewsDigital smooth-color studyAlpine White · Smooth
The 3D form is a family-level study, not a per-code viewer. It does not reproduce the selected catalogue code. Use the official drawing for its actual profile and dimensions. Digital color and texture are approximate; approve a physical sample. See all four precast finishes and 19 colors.
Selected reference
KST-10Keystone profiles
- Suitable conversations
- Arched windows · Entry arches · Fireplaces
- Coordinate before release
- Final dimensions, returns, attachment, tolerances, color, and texture.
Comparison tray · 0/3 selected
Select two or three references to keep a project shortlist.
Architectural precastTwenty-plus catalog profiles · Simple and ornamental forms · Custom sizingCustom profiles welcome
3 product images
A closer look at Keystones.
Explore product details and relevant project views. Catalogue drawings and alternative systems are identified in the captions. Select any image to see the complete view at a larger size.
From reference to release
What Landmark Stone needs to resolve the piece.
A catalogue code is a useful starting point, not the whole specification. Send the available project information and the team can help close the gaps before fabrication.
Start a Keystones review- 01Drawings & dimensions
Plans, elevations, sections, field measurements, or a marked-up sketch.
- 02Reference & design intent
A catalogue model, inspiration image, or profile that establishes the desired character.
- 03Quantity & configuration
Piece counts, linear footage, corners, radii, returns, openings, and repeated conditions.
- 04Color & surface
Target color, texture, adjacent materials, and the light conditions used for sample approval.
- 05Interface & schedule
Substrate, attachment assumptions, delivery sequence, site access, and required milestone dates.
Common planning questions
Useful answers before you request pricing.
Can catalogue references be customized?
Yes. Catalogue families establish proportion and design direction. Final size, length, returns, radius conditions, color, texture, and project interfaces can be reviewed for the selected application.
What should be included with a quote request?
Send the model or design reference, dimensioned drawings when available, quantities, project location, desired finish, and schedule. Early sketches are also welcome when details are still being developed.
How are color and texture approved?
Digital finish studies help narrow the direction, but physical samples should be reviewed beside adjacent materials and in the project’s actual light before final approval.
Are attachment and installation requirements included?
The final assembly depends on piece geometry, substrate, loading, access, and local requirements. These conditions should be coordinated with the project team before release.
Technical review
Planning information in one place.
Use these values for early material evaluation. Confirm final dimensions, tolerances, engineering, finish samples, and installation requirements with the Landmark Stone team.
Downloads
Keystones catalogRelated systems
Continue the material conversation.
Architectural
Window Sills
Cast stone sill profiles for windows, openings, veneer transitions, and coordinated façade surrounds.
Architectural
Baseboards & Wainscoting
Cast baseboards, plinths, and wainscot components that give interiors and protected exterior walls a finished datum.
Plan with Keystones
Bring the drawing, inspiration, or field condition.
Tell us what you are designing, building, or renovating. We’ll help identify the right material, finish, details, and next steps.