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Braymer (Braymer)
Senior Member
Username: Braymer

Post Number: 115
Registered: 09-2008
Posted on Wednesday, June 17, 2009 - 02:21 pm:   Edit Post Delete Post View Post/Check IP Print Post    Move Post (Moderator/Admin Only) Ban Poster IP (Moderator/Admin only)

Looks like someone is walking on it.
Seems like you could question your liability at this point, especially with proof that it was walked on by other people.. Photos of the bent snowtops and obvious stepped on tiles should help support your position.
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Tim_dittmar (Tim_dittmar)
Advanced Member
Username: Tim_dittmar

Post Number: 48
Registered: 05-2008
Posted on Wednesday, June 17, 2009 - 02:02 pm:   Edit Post Delete Post View Post/Check IP Print Post    Move Post (Moderator/Admin Only) Ban Poster IP (Moderator/Admin only)

Did someone overdrive nails on this area of the roof? There are formulas for nail length and I've wondered, "Are these formulas for a minimum or a maximum length? or both or .... When a slate nail penetrates the nailer completely, does nailing resistance change and then one hits the nail just as hard? as the last stroke(one more time to flush the head) and it's now been overdriven potentialing/causing slate damage? Would an ideal slatenail length be one where the nail point might be visible from the underside of the decking but few if any of them would completely penetrate. Would ringshank slate nails be less likely to exhibit reisitance change if overdriven? Petrified or excessively bouncing or knot-riddled lath could certainly contribute to problems of this sort, I'd think...
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Kwhord (Kwhord)
Senior Member
Username: Kwhord

Post Number: 235
Registered: 10-2006
Posted on Wednesday, June 17, 2009 - 08:51 am:   Edit Post Delete Post View Post/Check IP Print Post    Move Post (Moderator/Admin Only) Ban Poster IP (Moderator/Admin only)

Maybe there was an inexperienced installer working on that one face. They did not cull the slates as they were installed?

One possible scenario.
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Old_school (Old_school)
Senior Member
Username: Old_school

Post Number: 150
Registered: 01-2009
Posted on Sunday, June 07, 2009 - 05:39 pm:   Edit Post Delete Post View Post/Check IP Print Post    Move Post (Moderator/Admin Only) Ban Poster IP (Moderator/Admin only)

Who is walking on the roof? They don't break by themselves!
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Lmblase331 (Lmblase331)
New member
Username: Lmblase331

Post Number: 1
Registered: 06-2009
Posted on Sunday, June 07, 2009 - 10:23 am:   Edit Post Delete Post View Post/Check IP Print Post    Move Post (Moderator/Admin Only) Ban Poster IP (Moderator/Admin only)

We installed several new slate roofs in a 2 year period, we are having a problem with only one side of one of the roofs. We have been called back at least once every 1-2 years for breakage on this particular roof, no call backs on the others. All had been inspected the 1st and 2nd year following installation and remained perfect, no slipping or breakage, with the exception of this one roof. The only variable with this one home is the fact that it sits vacant the majority of the time. Most of the roofs required new lath, as did the roof in question, the lath had basically petrified, you couldn't nail into it. It was installed in 2003, on lath, hand nailed, 12 x 24 PA slates. A couple of the repairs were clearly storm/tree damage, one call back was obvious that someone (the chimney guy) had walked across the snow stops, bending them severly and broke all the slates above them. Any suggestions on why this one roof, and only one side of the roof, would have so many slates fail? So far, we have completed all repairs as warranty issues, even though clearly at least 2 were not. Any suggestions would be great.

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