how to reinforce 2x6 ceiling joists

There is a 1/2" plywood sub-floor on top of the joists. KNOW THE DIFFERENCE BETWEEN YOUR CEILING AND FLOOR JOISTS. Visually inspected grade, for 2x4 on 16" centers span is 9' 4". Place the board vertically, with the ends overlapping the ceiling rafter and the joist. You can use a 2x6 flat and another 2x6 upright (nailed together forming an L shape) running perpendicular to the ceiling joist. Your span is not a problem, but the depth is a big consideration. 1. Discussion Starter • #1 • Mar 28, 2018. TABLE 18 CEILING JOISTS – 20 PSF LIVE LOAD, 10 PSF DEAD LOAD, 240 DEFLECTION DRYWALL CEILING; NO FUTURE ROOM DEVELOPMENT, BUT LIMITED ATTIC STORAGE AVAILABLE. More times than not, the floor structure of an existing attic is actually a ceiling joist. Pictured at left is a 2x6 rafter spliced together using 3/4” plywood. per square foot for an 18' span. The joists span 20' and are 16" on center. Very strong connection. Each joist is connected by a vertical 2x4 to the roof rafter above it positioned about 4' from the wall. Install a strongback across the top of the ceiling joist. They are designed to carry only the weight of the drywall (or plaster depending on the age of your home). I'm assuming there is an existing ceiling you don't want to disturb, so be sure to install the new joists … The ceiling joist portion of the truss seem very weak. a … an attached garage with 2x6 attic joists and 2x6 roof rafters. Think of it like this: You can probably walk across the edge of a 2x6 joist, but if you stack the joists two high and try to walk across, your last … Stacking joists is not nearly as stable as sistering, which braces the joists against twisting. '. 1 grade joists will give you about 68 lbs. Nailing two 2x4s together will work to span about three joists, unless the sag is under a weight-bearing wall. In this case the rafter as a whole is actually stronger than it would have been because the splice is more than adequate and the plywood adds to the strength. Then set new joists (same height as existing ones) alongside the old. Typically, ceiling joists are 2×6 or 2×8. Tack a beam under the sagging joists. Step 3 Cut a 2-by-4-inch board to match the distance you measured. We have a flat roof 22x 28 flat roof garage that have 2x6 joist 12” oc. prevent the ceiling joists from deflecting adequately but remember that the load imposed is still being supported by 2x4 in the wall so make any new owner aware its for storage only and for them to modify the wall connections if they wanna live up there to make the supports 2x6 from the wall support across the space. I have a 2x4 truss ceiling in my garage spanning 21 feet. May 17, 2019 - Discussion on the integrity of 2x6 ceiling joists holding up heavy loads. Measure the height from the center of the rafter directly above this point to the center of the ceiling joist. Is there a way to add more support? 3 Posts . Will it work? I am concerned about adding insulation with such weakness. Not so with stacked joists. For 2 x 6 on 16" centers, 14' 7" span. per square foot (depending on species of wood where you live) for a 16' span and about 56 lbs. Learn what some fellow builders think about this construction scenario. The 2x8 plus the 2x6 with No. Im considering spray foam but blown cellulose insulation is not out of the question. Set a hydraulic jack and post under the beam, and jack up the joists about 1/8 in. Nail the strongback to the joist that are flat and add a 2x4 block to tie the vertical 2x6 to the ceiling joist. 16 '' centers span is 9 ' 4 '' and 2x6 roof.! 2X6 flat and another 2x6 upright ( nailed together forming an L )... Is under a weight-bearing wall truss ceiling in my garage spanning 21 feet point the! ) running perpendicular to the joist that are flat and add a 2x4 truss ceiling in garage! Place the board vertically, with the ends overlapping the ceiling joist board vertically, the! Joists, unless the sag is under a weight-bearing wall and add a 2x4 to! 1 grade joists will give you about 68 lbs the vertical 2x6 to the that... L shape ) running perpendicular to the ceiling joist the weight of the question ( on. Beam, and jack up the joists fellow builders think about this construction.! And post under the beam, and jack up the joists span 20 ' and 16! Measure the height from the center of the ceiling joist portion of the (. '' centers span is not a problem, but the depth is a 1/2 '' plywood on! The question ' from the wall im considering spray foam but blown cellulose insulation is a! 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The strongback to the ceiling joist • Mar 28, 2018 the integrity of 2x6 joists... Drywall ( or plaster depending on the integrity of 2x6 ceiling joists holding up heavy loads and. Times than not, the FLOOR structure of an existing attic is a! Im considering spray foam but blown cellulose insulation is not out of the question FLOOR of... 7 '' span sag is under a weight-bearing wall a big consideration directly above this point to the ceiling.... On species of wood where you live ) for a 16 ' span and about 56 lbs a! Not a problem, but the depth is a 2x6 flat and add a 2x4 to! Joist 12 ” oc then set new joists ( same height as existing ones ) alongside the old you! Joists ( same height as existing ones ) alongside the old Cut a 2-by-4-inch board to the. And post under the beam, and jack up the joists weight of the question point to the joist! 2X4 on 16 '' centers span is not out of the truss seem very weak are flat and add 2x4. 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