Roof Ridge Board Thickness

You may splice two boards together to achieve this length if necessary using a 14 and 1 2 inch block of the same material.

Roof ridge board thickness.

For 2 x 6 rafters use a 2 x 8 ridge board and so on. For 2 x 4 rafters use a 2 x 6 ridge board. Use panels rated as exposure 1 or better. Oriented strand board osb or plywood can be used although plywood will provide higher nail head pull through resistance.

The ridge board s length will be the outside measurement of the building plus the length of the overhang at both ends. This sizing guide for roof rafters will help determine what you need for your small project. Ridge boards shall be at least 1 inch nominal thickness and not less in depth than the cut end of the rafter irc section r802 3. Weather you re building a shed roof or adding a dormer to your second story it is important to choose the proper size rafter.

As a reminder please don t forget to add height of rafter thickness of roofing material and ridge vent to the number that you ll get using our calculator. Typically 15 32 inch or thicker panels are required in high wind areas. There are several variables to consider when determining the proper rafter size.