How to Secure Your Roof: A Guide to Rafter Ties and Joists

When it comes to securing your roof, one of the most important aspects is ensuring that the tie joists are properly connected to the roof rafters. In this article, we'll explore how to do just that.

First, let's take a look at the layout of the roof. A 'carpenters truss' is essentially a continuous ceiling joist that ties together two opposing rafters at the wall top plate. This design provides additional support and stability to the roof structure. In your case, you have a span of approximately 28 feet, which requires careful consideration when it comes to rafter tie placement.

According to industry standards, one of the most common methods for securing rafter ties is to install them every three rafters on 16-foot on-center spacing, using vertically 2x4 or larger boards. This ensures that the roof structure can withstand wind pressure and other external forces.

However, in your case, since the front half of the roof has perpendicular rafters and ceiling joists, it's recommended to install rafter ties spanning the width of the house to help resist outward wall pressure. This is especially important given the 4/12 pitch and 3-foot eaves on your roof.

In addition to securing the roof with rafter ties, it's also essential to ensure that the collar ties are properly installed. These ties should be spaced every four feet (or every other rafter) in the upper third of the roof, providing additional support and stability.

As you mentioned, your house is a 1700 sqft ranch with an attached garage built circa 1964. Given its age and design, it's possible that some modifications may have been made to the original structure over time. If you're concerned about the integrity of your roof or would like to make any changes, it's recommended to consult with a professional roofer or carpenter who has experience working on similar projects.

In conclusion, securing your roof requires careful attention to detail and a solid understanding of rafter tie placement and installation. By following these guidelines and consulting with professionals when necessary, you can ensure that your roof remains strong and stable for years to come.

Tie joists to roof rafters