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Joe Jenkins
Senior Member
Username: Joe

Post Number: 125
Registered: 07-2006
Posted on Monday, May 21, 2007 - 09:11 pm:   Edit Post Delete Post View Post/Check IP Print Post    Move Post (Moderator/Admin Only) Ban Poster IP (Moderator/Admin only)

Those of us who work every day on slate roofs that average over 100 years old know that what's underneath the slate doesn't matter in the long run. It's not there 100 years later, so its functional value never did amount to much. That goes for underlayment, ice shield, plastic, tin or copper cap nails, etc. What I don't like about the capped nails is that the cap interferes with the ripper if you have to repair the roof later. You slide the ripper under the slate and it hits a cap. We don't use them, although some slate roofs we install have been prepared by the builders with capped nails. That's how we came to realize what a pain in the a** they are when using a ripper.
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Peter
New member
Username: Plaughlin1

Post Number: 10
Registered: 03-2007
Posted on Monday, May 21, 2007 - 09:00 pm:   Edit Post Delete Post View Post/Check IP Print Post    Move Post (Moderator/Admin Only) Ban Poster IP (Moderator/Admin only)

Very true, but in humid salt laden climates the metal disks can corrode away in as little as 2-3 years.
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Walter Musson
Member
Username: Walter_musson

Post Number: 23
Registered: 07-2006
Posted on Monday, May 21, 2007 - 06:20 pm:   Edit Post Delete Post View Post/Check IP Print Post    Move Post (Moderator/Admin Only) Ban Poster IP (Moderator/Admin only)

the felt won't last for 50 years
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Peter Laughlin
New member
Username: Plaughlin1

Post Number: 9
Registered: 03-2007
Posted on Monday, May 21, 2007 - 05:12 pm:   Edit Post Delete Post View Post/Check IP Print Post    Move Post (Moderator/Admin Only) Ban Poster IP (Moderator/Admin only)

Down South in Miami Dade area the tin tags(2" metal disks) are required by building code to help hold the felt underlayment down during hurricanes.
In the coastal areas, & humid climates the metal disks rust and corrode away if galvinised steel is used.
Thus the need to make copper "tin tags".
Not everyone does,but when you are putting on a 100 year roof,the life expectancy of your metal disk material should match.
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Walter Musson
Member
Username: Walter_musson

Post Number: 22
Registered: 07-2006
Posted on Monday, May 21, 2007 - 03:29 pm:   Edit Post Delete Post View Post/Check IP Print Post    Move Post (Moderator/Admin Only) Ban Poster IP (Moderator/Admin only)

There is no purpose.
You can use plastic top nails for securing the felt.
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John Egan
New member
Username: Spaceman

Post Number: 1
Registered: 05-2007
Posted on Monday, May 21, 2007 - 11:00 am:   Edit Post Delete Post View Post/Check IP Print Post    Move Post (Moderator/Admin Only) Ban Poster IP (Moderator/Admin only)

What is the purpose of using copper washers (as opposed to other metals) to hold down tar paper under a new slate roof? Do these washers have a name?

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