I CAN'T STRESS THIS POINT ENOUGH, YOU MUST FOLLOW MANUFACTURES SPECIFICATIONS TO THE LETTER TO PREVENT YOUR SHINGLE WARRANTY FROM BECOMING VOID. THINGS TO LOOK FOR ARE AS FOLLOWS.

PROPER VENTILATION MINIMUM IS FOR EVERY 300 sq.ft. OF ATTIC YOU NEED 1 SQ.FT OF VENTILATION EQUALLY DISTRIBUTED BETWEEN ROOF VENTING AND SOFFIT VENTING. I WILL GO INTO MORE DETAIL REGARDING VENTILATION IN THE FUTURE.

ANOTHER MAJOR REASON TO VOID SHINGLE WARRANTY IS THAT YOU CAN'T NAIL SELF-SEALING SHINGLES TO A SHIP LAP BOARD DECK. SOME ROOFERS SAY YOU CAN, BUT TRY AND GET VERIFICATION FROM ANY MANUFACTURE, I COULD NOT GET ANY. THIS INCLUDES FIBERGLASS LAMINATE SHINGLES. YOU USE TO BE ABLE TO INSTALL INTER-LOCKING SHINGLES BUT THEY ARE NOT MANUFACTURED ANY MORE. WARRANTY'S ARE ALL THE SAME FOR ANY TYPE OF SHINGLES, ONLY DIFFERENCE IS THE LENGTH OF WARRANTY 30 YR, 40YR, 50 YR, AND LIFE TIME WARRANTY'S