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.
Traditional asphalt felt underlayments can tear easily and absorb moisture, leading to wrinkling that âtelegraphsâ through the shingles. Competitive priced with typical asphalt felts (pricing varies by market), GAFâs FeltBusterÂ® High-Traction Synthetic Roofing Felt: