Question: what is the difference between gaf timberline hd and hdz shingles?
Answer: GAF Unveils Timberline HDZ Shingles and No-Limit Wind Warranty. ... Up to 99.9% nailing accuracy thanks to its new StrikeZone™ nailing area — up to 600% larger versus Timberline HD® shingles. Up to 30% faster nail fastening during installation versus Timberline HD® shingles.