Roof Ridge Board Thickness

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.

Roof ridge board thickness.

If your goal is to only calculate the roof height do not enter any numbers in wall height field and only use building width and roof pitch fields. This sizing guide for roof rafters will help determine what you need for your small project. Weather you re building a shed roof or adding a dormer to your second story it is important to choose the proper size rafter. 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.

You may splice two boards together to achieve this length if necessary using a 14 and 1 2 inch block of the same material. Typically 15 32 inch or thicker panels are required in high wind areas. The ridge board s length will be the outside measurement of the building plus the length of the overhang at both ends. For 2 x 4 rafters use a 2 x 6 ridge board.

Roof pitch between 15 and 22 5 degrees with rafter spacing strength class c16 size of rafters in mm 400mm 450mm 600mm. Use panels rated as exposure 1 or better. For 2 x 6 rafters use a 2 x 8 ridge board and so on.