How to Layout Ceiling Joists to Create Structural Roof Rafter Ties When Lapping Over Interior Walls
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- Опубліковано 16 вер 2024
- www.homebuildi... Visit our website to learn more about structural roof framing and building repairs. In this video I will provide you with a few common house framing methods used by engineers to create rafter ties. These are structural connection that will prevent the exterior walls from spreading and top of roof from sagging.
Excellent description and visual on details that are hard to find in most tutorials and guidelines. Thank you!
You're very welcome!
I'm new to carpentry, and your vids have helped a lot
Awesome and glad to hear.
Let’s say the joists were overlapping then a block was put into tie them together and put over a wall underneath to support. In this case there’s no vertical load on the joists right? The joists are counteracting tensile forces from the wall if I understand this correctly. SO if you wanted to take out that wall, what options do you have?
So I'm buying an older home. Beautiful full brick, copper pipes, cedar and milled beams throughout. Except the roof has a rafter style and the previous owner destroyed its rafters and collars during so called "updates." My inspector said I could theoretically put any style of roof on the home.
I am considering a retrofit of a ridge beam supported by a column of 2 posts, or scissor trusses as we want a steep roof on the home. It looks like a massive shed as is. We will increase useable space as well. Can it be done?
Hello, I have a question. When you have ceiling joists stopping the rafters from opening up, is it necessary to still do a 'birdmouth' on the rafters, so they 'sit' on the top plate?? Thanks
You have a good point, but most engineers require a birds mouth cut.
Can you help me. I have a double pitched roof for a garage (2720 mm W x 5500 mm D and 4200 mm to highest ridge). The roof is supported by 5 x trusses with bottom core of 5500 mm long known as Fink style with W-shaped webbing. The truss is made up of 3 inchs x 1.5 inches timber. I would like to make a loft space usable with creation of a mezanine floor. For that I need to remove W-webbing of 3 of trusses as they are in a way. I believe ceiling joist should be 6x2 inch timber. Any suggestions pls.
By the way, I am not a builder (I am a healthcare professional), I am learning from YT like yours.
Thanks a million in advance. God Bless.
Another awesome video Greg. Thanks! Have you done a video on combination ceiling joists/collar ties? I'm building a 12:12 roof, 24' wide house, 4' knee wall, 8' ceiling. So the ceiling joists would attach to the rafters 4' in on both sides. They will be supported by a wall in the middle. I saw something in the Code that said if the ceiling joists are not attached to the top third of the rafter, the ridge beam has to be a true "beam"?
I would check out our website in the roof and ceiling framing sections. Let me know if you don't find something helpful.
@@gregvancom 👍👍👍
code only requires 1.5" bearing on a loadbearing wall. So there is really no need to even lap the joists. R502.6 Bearing.
The ends of each joist, beam or girder shall have not less than 11/2 inches (38 mm) of bearing on wood or metal
Thanks for the code reference numbers.
Hey good content, I have a question, is there a nail requirement to toenail the ceiling joist to the top plate (quantity and size nail)?
I like to use 16d sinker nails and put two angled toe nails on one side going through the joist into the top plate and one on the other.
Appreciate it
I have an old garage with no center wall. the rafters were installed at 32" and to make them stronger for storage above them i wanted to insert a new rafter at the 16" interval that was never used originally. I am curious how you would join two boards to make a structural rafter or if that is simply not done.
If you can remove the lower blocking, then you can slide the rafter through the opening and install the long rafter. Then reinstall blocking. Let me know if that's not possible in your project.
Hey. Quick question. What is minimum lenght of top plate?
Also maybe you can recommend some books with codes and rules. Why im asking?
Im trying to learn framing. In living im europe/ Poland. Here is not enough books with knowledge about framing.
Climate here is like east/north part of USA. Hot in summer , cold winter with wind somethimes
There is no minimum length for top wall framing plates. However there are some building codes that require a 4 foot minimum lap in longer walls with plate breaks.
I do have more wall framing videos at our website. www.homebuildingandrepairs.com/framing/index.html
so if I understand correctly, a strap across the top of the roof rafter is equivalent to a collar tie ?
I've seen straps used to replace collar ties.
Lost on that one
Feel free to provide more details if you need more information.