Do you have an approved installation for Spanish S tiles on a 5/12 slope at 40 +/- above grade in a 130 MPH wind zone?
The required uplift at a 40 ft. mean roof height, 130 mph wind zone, coastal exposure, is 35.1 ft-lbs. Two (2) screws, direct deck installation, provides 51.3 ft-lbs resistance which complies with the code. Polyurethane adhesive (66.5 ft-lbs) also complies with code guidelines. We have a large area in our kitchen family room that a tile roofing company has said would be at risk if we used Cedar or Dura Lite roofing tiles due to the extra weight of the tiles and roof assembly. At risk meaning we have a chance of the roof sagging over time and since we life in Northern California the chance of the roof suffering damage during an earthquake is greater. This does concern me because we have a neighbor who roof is sagging after tiles were put on. Please give me your opinion. The area is a 20 foot span from a support beam to a support wall. The roof pitch is 6/12. The joist are 2×8’s and are 16″ apart. The existing roof is wood shake. You did not state whether your roof system was a cathedral
