Integrated Partner

Design with Freres Mass Ply Panel

Freres manufactures Mass Ply Panel, a patented CLT-equivalent structural panel, integrated into SPEC Toolbox with ANSI/APA PRG 320-certified data on every panel. Size, verify and specify a Freres Mass Ply floor, roof or wall build-up into the project you're designing, verified to the NDS in the US. Every value comes from Freres' published PRG 320 certification, not a generic catalogue number.

Explore The Integrations → Powered by SPEC Toolbox. Real PRG 320-certified data on every part.
  • 15 calcs
    CLT tools available
  • 6,000 +
    Engineers using SPEC
  • 12 +
    EU CLT & fastener brands
  • 100 % free
    Browser-based · no download
Integrated product system available now in the USA.

The Freres system, ready to design

Integrated product system available now in the USA, designed to the NDS and certified to PRG 320.

USA
CLT (cross-laminated timber) design icon
CLT

CLT

the NDS (ANSI/AWC NDS) under the IBC / IRC Calculator →
USA
CLT (cross-laminated timber) design icon
Glulam

Glulam

the NDS (ANSI/AWC NDS) under the IBC / IRC Calculator →
In their words

Why Freres builds on SPEC

“We are very excited to be partnering with SPEC Toolbox. We hope that this is an avenue to remove a little bit of the enigma and the mystery around mass timber construction, to compare effectively against all the other building materials — to know that not only are we the best aesthetic, not only are we the best from a biophilic perspective, but we can also be the best when it comes to the competitive cost of our materials. So SPEC Toolbox for us is an educational instrument in which we can start to penetrate additional markets that so far have been a little bit leery about using this type of material.”

— Tyler Freres, VP Sales, Freres

Spectoolbox

About Freres

Freres is a U.S. family-owned wood products manufacturer based in Lyons, Oregon, with a history dating back to 1922. Over more than a century, the company has grown from a regional sawmill operation into an innovative producer of engineered wood products, veneer, plywood, lumber, and mass timber solutions, with a strong focus on sustainability, zero-waste manufacturing, and full utilization of every log.

Freres’ flagship mass timber product line is Mass Ply, including Mass Ply Panels for floor, roof, and wall applications. Freres describes Mass Ply Panel as a patented structural composite lumber-based panel, ANSI/APA PRG 320 certified as a cross-laminated timber panel, and positions it as an alternative to conventional CLT.

Frequently asked questions

Design With Freres

Is the Freres calculator free to use?
Yes. Every Freres calculator on SPEC Toolbox runs free in the browser. No download, no licence, no account needed to design and verify with real manufacturer data.
What standard are Freres Mass Ply Panel designed to?
Freres Mass Ply Panel is verified to the NDS in the US, certified to ANSI/APA PRG 320 as a cross-laminated timber panel.
Which Freres products are integrated?
Mass Ply Panel is integrated for the USA. 1 product system in total.
Can I design connections into Freres Mass Ply Panel using any supplier's screws or brackets?
Yes. The calculator lets you pair Freres Mass Ply Panel with screws or brackets from any integrated supplier, verifying the connection against Freres' real material properties.
Where does the capacity data come from?
Directly from Freres' published ANSI/APA PRG 320 certification. Nothing is averaged or re-derived.
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