Does this cut joist need to be sistered?
kevin m
3 years ago
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InnoVision Design & Project Management Inc.
3 years agolast modified: 3 years agoJoseph Corlett, LLC
3 years agoRelated Discussions
To cut or not to cut sagging ceiling joists
Comments (21)The issue with cutting off part of the bottom of the joists in question is not the increase in deflection at the design load because the old joists are already so stiff and close together that they would far exceed modern code design standards with an inch removed. But because of the excessive sagging, the relevant issue is the condition of the joists and the current loading which we cannot know without inspecting the structure in person. I suspect it would be OK to cut off whatever is needed to level the ceiling and reinforcement would be a hedge against unknown conditions but to be safe (and legal in most jurisdictions) it would be necessary to get the written approval of an engineer who had actually inspected the structure....See Moresistering joists bathroom
Comments (1)There are metal joist repair plates available but it the joist is cut all the way through you will have to sister or replace them. Here is a link that might be useful: repair plates...See MoreSistering joist questions
Comments (3)Trimming the sister shorter does not make much difference since sag is not a bearing area issue. The problem with any type of jacking is that the old joist may have a set that will not go away very quickly. If you want to try and straighten the old joist before sistering watch what is happening very carefully as you start to lift the middle. Some joist will give enough, but many will not and the end(s) can actually be lifted off their bearing location. Raising very gradually (1/8 inch per week type numbers) can give the old wood some time to move back into a straight line. Glue is not normally needed, and in most cases is assigned a zero strength since application is so variable. All you need is a slightly thicker glue line to render it useless, and correct glue line thickness is very thin (thousandths of an inch over the entire glue area). Clamping is required to even get close to a correct glue line. 16d nails are more than adequate. While bolts and lag screws may appear better if you use fewer of them tan you would nails you can easily exceed the compression limits of the wood. There are nailing rules for new work that can serve as a starting point, but older lumber may have been ungraded or just over spanned, making a more frequent nailing schedule needed....See MoreSister notched 2x8 joists
Comments (9)This pumber should be fired, if he didn't allow for as big as possible sistered joist to be installed on both sides,at least 18 inches pass the notch with being glued and screwed. Got to get this one stamped and fixed, but it looks like that can be done....See MoreGN Builders L.L.C
3 years agoSeabornman
3 years agoformulaross20
3 years agoUser
3 years agoJoseph Corlett, LLC
3 years agoInnoVision Design & Project Management Inc.
3 years agoGN Builders L.L.C
3 years agoformulaross20
3 years agoJoseph Corlett, LLC
3 years agokevin m
3 years agoJoseph Corlett, LLC
3 years agoCharles Ross Homes
3 years agoInnoVision Design & Project Management Inc.
3 years agoUser
3 years agoSeabornman
3 years agoJoseph Corlett, LLC
3 years agoCharles Ross Homes
3 years ago
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