UPM’s new structural plywood achieves highest fire classification

WISA-SpruceFR from UPM Plywood is fire-rated, saving builders significant time

The new fire retardant WISA-SpruceFR structural plywood for building and construction is B-s1, d0 fire rated, the highest classification a wood product can have.

The unique product from Finnish forestry company UPM Plywood is different, said Riku Härkönen, product manager at UPM Plywood. “There are products which are either extremely expensive, pressure treated, or they come with conditions and requirements for other structural solutions.”

The fire-retardant treatment in WISA-SpruceFR does not compromise the plywood’s technical properties. The panels preserve the original qualities of untreated WISA-Spruce plywood. It also does not require any special structural design to achieve the fire classification. It can be used just like a regular plywood panel.

“A significant development is that WISA-SpruceFR can be installed leaving air gaps between the panel and other structures and insulation and still retain the product’s fire-retardant properties and classification,” Härkönen added.

The fire-retardant treatment is already applied on the panels during manufacturing is a substantial benefit for contractors and developers. It saves time, material and costs in various project phases.