Free Technical Papers from
Haag Engineering

Straight from Haag’s Research and Testing department come tools and publications for use in the field, assisting you in your assessment with great pictures, descriptions, and analysis that can help you make more informed decisions.

• FREE! - Long Term Effects of Hail Impact on Asphalt Roofs
  This paper is an interim report on Haag's ongoing study of the long-term effects of hail impact on asphalt shingles. Granule loss is also discussed.
  
  
• FREE!- Haag Engineering Co. Ball Peen Test
  A FREE study of the effects of striking ball peen hammers against red cedar and composition shingle roofs. Results will assist roof inspectors in identifying damage uncharacteristic of that caused by hailstone impact.
  
  
• FREE! Hurricane Katrina Verification Study
  The Katrina Verification Study compares the wind and surge values presented in Haag's original Katrina Storm Damage survey with reports from USGS, FEMA, NWS, MSU and more. Download avail. after checkout.