Z-speed rated tires. â¦tires were all Z-speed rated. They were tested at some speed above 149 mph. In order to be more precise, tire manufacturers started testing at 168 mph (W-speed rating) and 186 mph (Y-speed rating). In the above picture you'll see 91W to the right of the size. The W of the 91W means the above Yokohamaâ¦.
I get this question many times and it is my opinion that the old felt should be removed and not covered over. I donât know why some roofers say âleave it onâ. I seem to me if you are going to the trouble of removing the shingles, you now have a chance to do repair on the roof deck by removing all the old felt.
Leaving the old felt on does not make the roof work or last any different. dave63028 2009-10-03 15:22:53 UTC #5. Sometimes theres no reason to remove the old felt. You can tell the decking is bad when you walk on the roof deck during tear off.If the felt is laying flat leave it on.I would have him use 15 lb Ul felt.