it is equal to to 72 because 2x6=12 and 3x2=6 and 12x6=72 or if you think this is to complicated, you can do 2x6=12, 12x3=36, and then 36x2, which then also gives you 72
therefore, with a closed roof system 2 - 2x6 redwood joists can span about 12' -6' when supporting 4' of roof. how about moving the corner posts in 18' on each corner and provide a 18' overhang on each corner in the front.
the pergola may someday support vines. i've found some online span charts, but they don't really apply to pergolas, which carry so much less load than floor/ceiling framing. any help on the beam
for a very small pergola with only 4 to 6 feet between posts, 4×4 supports will work. for anything larger, though, the 6×6 stock will not only offer a beefier look and greater carrying capacity, but 6×6 also resists the twisting associated with the more spindly 4x4s.
re: maximum span of a joist for a pergola 06-07-2016, 05:06 pm no point guessing until the op responds, my take was he was asking about rafters for a 28' span so 16' 2x6 would probably be fine if made into a truss with or without a centre hanging post.
thus, a double 2x12 beam could span 12 feet - with 20' beams, posts at 10' might look the best. that said, this is typically applicable for a deck with 10 psf dead, 40 psf live. depending on your loading and design, this may or may not be applicable.
rafter span tables - use these tables to determine lengths, sizes and spacing of rafters based on a variety of factors such as, species, load, grade, spacing and pitch. visit the roof framing page for more information on cutting roof rafters, and visit the roof pitch calculator for determining rafter lengths based on rise and run.
the length, or span, of a 2x6 framing stud ranges from 84 inches to 120 inches. the typical length found in u.s. hardware stores is 96 inches, or 8 feet. the type of wood that is being used often effects what length is available.
douglas fir maximum horizontal roof rafter span for lumber grade selected structural and no. 1 and no. 2, are indicated below. max. dead load weight of structure and fixed loads 15 lbs/ft2. live load is weight of furniture, wind, snow and more.
maximum floor joist span for no. 1 and no. 2 grade of douglas fir are indicated below. max. dead load weight of structure and fixed loads 10 lbs/ft2 . live load is weight of furniture, wind, snow and more.
our lumber span chart is based on adjusted modulus of elasticity based on long term creep and temperature. example: in a pergola application can a 2 x 8 x 8 joist spaced 24 on center support the load of 2 x 4 boards placed on top of the 2 x 8 spaced 12 on center. the 2 x 4 boards weigh 2 lbs. / foot.
beam size for long span on pergola decks fencing patio roof maximum beam rafter spans pergola 2x6 over a 14 span doityourself community forums pergola beam span calculator pergolalosangeles post arbor pergola beam chart of weight can carry pergola beam span 18.
the length, or span, of a 2x6 framing stud ranges from 84 inches to 120 inches. the typical length found in u.s. hardware stores is 96 inches, or 8 feet. the type of wood that is being used often effects what length is available. there are six lengths that 2x6 studs are typically cut to during processing at a lumber yard.
im in the process of helping a neighbor with a sun porch he is building. it will be approximately 16×16. we are think of 4 posts and spanning it with 2x6s. on top of the 2×6 would be some 2×2 lathes to provide the shade. can the 2×6 support the weight of this without a post at 8 feet? tia. martin