One thing on Drew Goldsack’s spring cleaning punch list this year is removing the vinyl siding from his Alberta home and replacing it with cedar board-and-batten siding.
As he explains in this Q&A post, the plan is to install 1 1/2-inch Comfortboard mineral wool insulation, a rain-screen drainage mat, then horizontal 1×4 furring strips before adding the yellow cedar siding. His initial question concerns the fasteners he should use to make sure the siding stays put.
“I have been unable to find a local building code that specs fastener penetration for cedar board and batten (3/4″ thick boards and approx. 7/8″ thick battens),” Goldsack writes. “However I did come across the Western Red Cedar Lumber Association specs that recommend a minimum 1-1/4″ fastener penetration for installation of board and batten.”
Goldsack had thought that a 3/4-inch penetration of ring-shank nails into the furring would be enough, but now he’s not so sure. Would that be enough? Should he switch to screws instead, or make the furring strips thicker?
Those are the questions that start this Q&A Spotlight.
Consider stiffer furring strips
Russell Miller reports “zero issues” when he’s used 3/4-inch plywood or 3/4-inch pine or fir furring strips. Either should work, he says, unless Goldsack is building in a coastal or tornado-prone area. “Even then,” he says, “tighter nailing of siding is the main issue.”
But GBA Editor Brian Pontolilo raises another issue—the difficulty of keeping mineral wool flat under 1×4 furring.
“Have you specifically used 3/4 inch furring strips over exterior mineral wool?” he asks. “I’ve heard that thicker furring strips, mainly 2x4s, make it easier to keep the furring strips in plane for a flat siding install and that 1x material bends too easily and therefore compresses the insulation.”
In either case, Pontolilo suggests…