The steel material only accounts for about one-third of the total framing cost. Two-thirds of the cost goes into fabrication, erection, and other labor costs. Like archeng59, I often add steel tonnage in order to have a more repetetive building that cuts down the labor costs.
1 A change in skin color is due to an underdeveloped circulatory system. 2  Babies often exhibit mottling of the skin due to their immature circulatory system. 3  The nerve supply to the fine blood vessels on the upper skin layer is still immature.
Your skin type affects how easily you become sunburned. People with fair or freckled skin, blond or red hair, and blue eyes usually sunburn easily. Although people with darker skin don't sunburn as easily, they can still get skin cancer. So it's important to use sun protection, no matter what your skin color is. Your age also affects how your skin reacts to the sun. The skin of children younger than 6 and adults older than 60 is more sensitive to sunlight.