To explore the feasibility of hem-fir for CLT products, this work addressed the exploratory
and pilot plant studies of hem-fir cross-laminated timber (CLT) products through mechanical
tests. The hem-fir lumber was procured and then stress-graded based on dynamic modulus of
elasticity (MOE). The resulted 5-ply prototype CLT products were then tested non-destructively
and 3-ply pilot plant hem-fir CLT was tested destructively. The results showed that bending
performance of hem-fir CLT panel can be predicted. Considering cost-competitiveness and
end applications of hem-fir CLT products, the panel structure can be optimized based on the
stress-graded data of hem-fir lumber.
The North American product standard for performance-rated cross-laminated timber (CLT), ANSI/APA PRG 320, was published in 2012. The standard recognizes the use of all major Canadian and US softwood species groups for CLT manufacturing and provides design...