paulmars Posted May 15, 2014 Report Share Posted May 15, 2014 I've decided to add rafter ties to my home. Im thinking of using cable. 1952 house. This house was built with NO rafter ties and very few collar ties. Block construction. The joists run from gable to gable. With the nakid eye the ridge is not sagging, walls are not bowing. However, I have added hurricane straps and gable supports. Soon, i will be replacing the roof and while at it, screwing the roof planking to the rafters. Im making my home as hurricane resistant as possible. Therefor I have also decided to add cable rafter ties and 2x6 collar ties. suggestions? pa Quote Link to comment Share on other sites More sharing options...
Erby Posted May 15, 2014 Report Share Posted May 15, 2014 You could also just use 2 x rafter ties across the tops of the joists. Remember the collar ties are there to hold the roof down, not keep it from sagging. That's the job of the rafter ties. Quote Link to comment Share on other sites More sharing options...
Marc Posted May 15, 2014 Report Share Posted May 15, 2014 What Erby said. Forget the 2X6 collar ties. 1X4s are fine, 4 feet apart. Use this checklist to improve the resiliency of your home to hurricane-force winds. It's the smart move. Don't try to self-engineer. That has already been done and the methods are available to any owner of a wood framed structure. Marc Quote Link to comment Share on other sites More sharing options...
Jim Katen Posted May 15, 2014 Report Share Posted May 15, 2014 Sounds like a plan. Don't use drywall screws. Use Simpson SDS screws. What kind of cable will you use? How will you connect it to the rafters? Will you use one cable for every set of rafters? Quote Link to comment Share on other sites More sharing options...
paulmars Posted June 15, 2014 Author Report Share Posted June 15, 2014 Sounds like a plan. Don't use drywall screws. Use Simpson SDS screws. What kind of cable will you use? How will you connect it to the rafters? Will you use one cable for every set of rafters? aircraft dont know. 4' oc Quote Link to comment Share on other sites More sharing options...
Steven Hockstein Posted June 15, 2014 Report Share Posted June 15, 2014 Use info from this section of IRC 2009 R802.5 Allowable rafter spans. Spans for rafters shall be in accordance with Tables R802.5.1(1) through R802.5.1(. For other grades and species and for other loading conditions, refer to the AF&PA Span Tables for Joists and Rafters. The span of each rafter shall be measured along the horizontal projection of the rafter. Quote Link to comment Share on other sites More sharing options...
mjr6550 Posted June 16, 2014 Report Share Posted June 16, 2014 what is the roof pitch and the distance from wall to wall that support the rafters? Quote Link to comment Share on other sites More sharing options...
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