Material cost is another important consideration. Since furring strips can be cut from larger boards, you use fewer boards to install furring strips, translating into about half the cost of stud wall framing. However, what you save with furring strips is balanced by the cost of insulation. Given the price of a double layer of expanded polystyrene foam insulation -- a total R-value of about 8 -- or R-13 fiberglass, the foam insulation costs more.
Vertical nail ridges, which extend from your cuticle to the tip of your nail, are fairly common and often become more numerous or prominent as you age. Vertical ridges in your nails are not a health concern. Although the exact cause of such ridging isn't known, heredity likely plays a role.
1 If you are taking care to eat plenty of protein, calcium and vitamin rich foods, but your fingernails are still displaying deep ridges it could mean that your body is having nutrient absorption issues. 2  If this is the case, it is important to consult a doctor to find out what is going on.