![]() How far can a 2×8 span without support pergola? Maximum allowable span for a 2×8 rafter:- the maximum allowable span for 2×8 rafter is 21 feet 7 inches when spaced 12 inches apart from centre, 19 feet 6 inches at 16″ OC & 18 feet 6 inches at 24″ OC with best quality No. How far can a 2×8 rafter span without support. How far can a 2×8 rafter span without support? What size rafters do I need for a 10 foot span?Īs per general rules and guideline, for 10 -12 foot span, generally you need 2″×6″ size of rafter, for 15 -16 foot span, you need 2″×8″ rafter, for 18 – 20 foot span, you need 2″×10″ rafter & for 24 foot span, you need 2″×6″ size of rafter placed at 16″ apart from centre. A lower ceiling feels right-sized for intimate gatherings, while a larger roof is more in scale with a larger structure. The minimum height of a pergola should be no lower than 7’6” to provide enough head room, though most projects call for a range of 8-10′ in height. Always check the codes for determining factors or consult a Structural Engineer. The maximum distance a 2×6 can span, according to the 2018 IRC, for a floor joist, is 12′-6”, ceiling joist 20′-8”, rafter 18′-0”, deck board 24”, deck joist 9′-11”, deck beam 8′-3”, and 6′-1” as for header.
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