We always hear this from our customers when they are replacing their roof. Fascia is the horizontal trim around the perimeter of a roof that covers the trusses or rafters and protects the soffits and is usually wood.
As owners are getting various roof quotes, they are being informed or misinformed by the different roofers. Other roofers often state that they use pressure treat wood for fascia board replacement because it doesn’t rot. This sounds great and seams logical but it isn’t recommended.
Pressure treated wood will permanently expand and contract more than other wood, causing it to split and warp due to the chemicals trapped inside. Pressure treated wood comes wet from the lumber yard and is usually of construction grade. This wood should never be painted, only stained after months of allowing to dry.
The standard wood used for fascia is non treated pine, spruce, fir and cedar. Cedar being more weather and termite resistant but more expensive. The key in preventing rot on your fascia boards is to make sure that all joints, splits and nail penetrations are securely sealed and that the boards are properly primed and painted. This should be checked and done whenever the exterior is painted but is often neglected. It is best to use a latex paint as it will naturally expand and contract with the wood where as an oil based paint will crack.