If the staples don't go in all the way i just pound them in with a hammer: Trim the 1 thick upholstery foam to the exact dimensions of the top of the bench. Simple Bench Plans Outdoor Furnitur…
Now go put your seat cushion in place and enjoy! (depth in inches x 2.5 = c) add this number (c) to the measurements on all 4 sides around the rectangle. DIY Window Seat Cushion Quick & Easy! …