CLT Grade E1 (PRG 320) - Design Values

CLT Grade E1 (PRG 320) is a cross-laminated timber (clt) grade with reference design values to ANSI/APA PRG 320. Its reference bending value Fb is 1,950 psi, compression parallel Fc is 1,800 psi, and modulus of elasticity E is 1,700,000 psi (NDS). Values are shown before adjustment factors; apply the relevant NDS C-factors or EC5 k_mod and γ_M for your load case.

Fb (bending): 1,950 psi
Fc (compression): 1,800 psi
E (modulus): 1.7M psi

Representative values. E1 major-direction laminations are 1950f-1.7E MSR Spruce-Pine-Fir. Panel bending/shear capacity depends on the layup (thickness, layers) - use PRG 320 panel tables or the shear-analogy method for design.

Reference design values (NDS 2018)

Fb	Bending	1,950 psi
Ft	Tension parallel	1,375 psi
Fv	Shear parallel	135 psi
Fc⊥	Compression perpendicular	425 psi
Fc	Compression parallel	1,800 psi
E	Modulus of elasticity	1,700,000 psi
Emin	Modulus for stability	620,000 psi

Source: ANSI/APA PRG 320. Reference values are shown before adjustment factors (NDS C-factors / EC5 k_mod, γ_M) - apply these per your load case in design.

Other Cross-Laminated Timber (CLT) grades

CLT Grade E2 (PRG 320)CLT Grade V1 (PRG 320)CLT C24 laminations (EN 16351)

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