Johnston & Rhodes Bluestone Co.

CONTACT US: 607.363.7595

info@johnstonandrhodes.com

  • OUR COMPANY
    • Contact Us
    • FAQs
    • Mill & Quarry Operations
    • Testimonials
  • PRODUCTS
    • Blue Thermal
    • Custom Cut Architectural Stone
    • Fieldstone & Landscaping Stone
    • Natural Cleft Full Color
    • Pool Coping & Decking
  • FINISHES
  • EDGE TREATMENTS
  • COLOR RANGE
  • PHOTO GALLERY
  • FOR CONTRACTORS
    • Technical Data
    • Templates / Drawings
Johnston & Rhodes Bluestone Co.
Menu
  • OUR COMPANY
    • Contact Us
    • FAQs
    • Mill & Quarry Operations
    • Testimonials
  • PRODUCTS
    • Blue Thermal
    • Custom Cut Architectural Stone
    • Fieldstone & Landscaping Stone
    • Natural Cleft Full Color
    • Pool Coping & Decking
  • FINISHES
  • EDGE TREATMENTS
  • COLOR RANGE
  • PHOTO GALLERY
  • FOR CONTRACTORS
    • Technical Data
    • Templates / Drawings

Technical Data

Technical Data on our bluestone products is provided for contractors. Please contact us with any additional questions.

Note: The information in this section is relevant to Elk Brook Bluestone only, and is not applicable to other bluestones and/or sandstones. Johnston & Rhodes Bluestone Co. has privately and independently confirmed all testing data below, using exclusively Elk Brook Bluestone samples.

GENERAL INFORMATION

Geological

A metamorphic sandstone of the Appalachian Plateau. Formed in the Devonian Age, the Upper Devonian Stone is green and lilac, while the Middle Devonian Stone is dark gray and blue.

Texture: Fine to medium grain.

Color: The basic colors are shades of green, blue, gray, buff, and lilac. Surface colors on natural surfaces are shades of brown, purple, and rust. Sawn material is consistent blues and grays with instances of green and some possible veining.

Chemical Analysis: Silica 77.80%, Alumina 8.40%, Iron Oxide 2.86%, Titanium Oxide .52%, Calcium Oxide 2.27%, Magnesium Oxide 1.20%. Alkalies 2.13%, Sulphur Trioxide .13%, Loss on ignition 2.64%

CERTIFIED TEST RESULTS

(Official copy available on request.)
1.) DENSITY (ASTM C97) lb.siff3) = Average of 169.2

2.) ABSORPTION (ASTM C97) = Average of 0.67 %

3.) COMPRESSIVE STRENGTH (ASTM C170), psi: Dry Parallel, psi = Average of 23,230 psi Wet Parallel, psi = Average of 15,900 psi Dry Perpendicular, psi = Average of 12,770 psi Wet Perpendicular, psi = Average of 11,240 psi

4.) MODULUS of RUPTURE (ASTM C99) psi: Dry Perpendicular, psi = Average of 3,050 psi Wet Perpendicular, psi = Average of 2 410 psi

5.) ABRASION RESISTANCE (ASTM C241) = Average of 79.0

6.) FLEXURAL STRENGTH (ASTM C880) psi = Average of 3,360 psi

NATURAL CLEFT BLUESTONE

Dimensional Tolerances

Paving Thickness:
5/8″ Nominal Multiple Pattern – 1/2″ to 3/4″ thickness

1″ Nominal Multiple Pattern – 3/4″ to 1 1/4″ thickness

1 1/2″ Nominal Multiple Pattern – 1 1/4″ to 2 1/4″ thickness

2″ Nominal Multiple Pattern – 1 3/4″ to 2 1/2″ thickness

Face Dimensions:
Quarry Cut: Size/squareness is +/– 1/4″. Edges are sawn, pitched, or snapped

Shop Cut: Size/squareness is +/– 1/8″. Edges are sawn.

Exposed Edge Dimensions:
Quarry Cut: Height is +/– 1/4″. Shop Cut: height is +/– 1/8″.

Flatness Tolerance:
Surface variation not to exceed +/– 1/ 8″ in each square foot of exposed area.

Beds & Joints:
Allow 1 1/2″ mortar bed for setting. Allow 3/4″ mortar bed setting for treads, coping, and sills. Allow 1/2″ for typical joints.

Backs of Stone:
Backs of all pieces may be natural or sawn. Backs of paving may not vary more than 1/2″ in 12″. Backs on treads, coping, and sills may not be more than 1/2 the setting bed.

SAWED-SIX-SIDES THERMAL, RUBBED, OR HONED BLUESTONE

Dimensional Tolerances

Thickness:
Typical tolerance to be +/- 1/8″. Paving may vary slightly more, depending on setting bed conditions.

Face Dimensions:
Typical size/squareness tolerances for architectural cut stone is +/- 1/8″. Fabrication capabilities may allow the possibility of +/- 1/16″ in certain cases. Paving may vary somewhat more depending on the bed joint conditions and material specifications.

Flatness Tolerance:
Honed or Rubbed Finish – surface variation not to exceed +/-1 /16″ in each square foot of exposed area.

Thermal Finish – surface variation not to exceed +/- 3/16″ in each square foot of exposed area.

Beds & Joints:
Pieces shall be bedded and jointed as shown on the approved shop drawings, with a minimum of 1/4″ bed or joint dimension. Fabrication capabilities may allow for tighter joints, depending on stone application and field conditions.

Backs of Stone:
Backs or pieces shall be sawn or roughly dressed to approximate true planes.

Contact Us


  • My client wanted an outdoor hearth and sitting area, but couldn’t decide on materials that were good enough for their vision. Th...
  • When it came to the stonework for redesigning our pool area, I told my contractor to “use only the best.” He went with Johnsto...
  • Working with the team at Johnston & Rhodes Bluestone has been a pleasure. The pricing is always competitive, and the rock qual...
  • Johnston & Rhodes provides service and quality second to none. I’ve used them multiple times for multiple projects, and ...
  • Johnston & Rhodes has given us decades of courteous service, competitive prices and, most importantly, quality stone.  Great ...
Testimonials
  • Home
  • Our Company
  • Products
  • Finishes
  • Edge Treatment
  • Color Range
  • Photo Gallery
  • Technical Data
  • Templates/Drawings
  • FAQs
  • Testimonials
  • Contact
  • Privacy Statement

Main Office
P.O. Box 130
1 Bridge Street
East Branch, NY 13756

Contact
P: 607.363.7595
F: 607.363.7894
Email: info@johnstonandrhodes.com

Copyright ©2023 Johnston & Rhodes Bluestone Co.