I am often asked if an insurance company is responsible for a "defective" product. While that topic is the subject of great debates, one thing concerning Hardishake damage is beyond debate:
"3/4 inch hail size... [the] threshold size for damage to... deteriorated gray-black slates (especially at corners)- chipped." HAAG ENGINEERING
A Hardishake shingle that is deteriorating is especially susceptible to hail damage (even small 3/4" sized hail). When the corners are chipped the exposure can be dangerously increased.
Back in 1995 I learned a very expensive lesson... An increase in exposure of even 1/2" (the size of most Hardishake corner chips) is in fact over-exposure and can cause serious water damage to the interior of a home. Corner chips are therefore not "cosmetic damage". They speak directly to the integrity and life expectancy of your Hardishake roof.
3 comments:
I would suggest that you read the NRCA and the RTI for there imput on what broken corners can do.Or go to Joe Jenkins web site. Most slates should have a three inch or four inch head lap. The lesson you learned seems to tell me that the roof was put on improperly. If the slates were given the correct spacing i.e Half bonded. the roof should not leak with 1/2" corners missimg
A 1/2" corner chip could very well be a significant problem on a staggered butt roof with 6", 8", and 12" varying shingle widths. However, most inspectors know that these problematic corner chips are often as big as 2"-3". In fact, it isn't unusual to see a roof with several smaller chips AND 2 or 3 shingles chipped completely in half.
But the point i am trying to get across to you,is that the bottom of the third course of slates should cover the top of the first course of slates by three inches or four inches. If the proper side laps are given to the 6",8" and 12" slates i.e 3" then 1/2" chipped corners will not cause any major problems with the roof system. However, i do agree with you that 2" or 3" chipped corners could cause a problem with wind driven rain.
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