How To Raise Sagging Roof Rafters By Attaching New Ones To Old
The first step is to identify if the rafters are sagging more than an inch in 12 feet. If they are, they may need to be replaced. Otherwise, you can try to repair them by following the steps in the video.
The next step is to remove the collar tie, mid-span blocks, and any drywall in the way. Then, you will need to build a support wall underneath the ceiling joists. If you don't have a beam or wall there, you can remove the drywall to make the job easier. Once the support wall is in place, you can remove the damaged roof rafters.
The next step is to cut the new rafters so that they will fit in the space between the old rafters. You will also need to remove the tail of the old rafter if it is damaged. Then, you can insert the new rafters and temporarily support them with screws.
Once the rafters are supported, you may need to cut them or wedge them to raise them up. This is because the existing rafters may be bowed, which will make it difficult to get the new rafters in place. You may also need to add additional supports to the roof.
The next step is to install blocks between the new and old rafters. These blocks will help to keep the rafters in place as you raise them. Once the blocks are in place, you can raise the rafters up using jacks.
Once the rafters are raised to the desired height, you can install screws to secure them in place. You will also need to install a shim underneath the bottom of the rafters. Finally, you can nail the rafters to the roof sheathing.
Bonus Tips
If you are not sure whether or not your roof rafters need to be replaced, it is best to consult with a professional.
It is important to use the correct size rafters for your roof. You can check your span charts to determine the correct size.
If you are replacing your roof rafters, you may also want to consider installing a purlin system to provide additional support.
It is important to follow all safety precautions when working on your roof.
