| Author | Message | ||
     KMero |
Is there a self test that you can use to check the quality of slate? The harder the slate the slate the better the quality, Right? | ||
| admin |
Most slate is hard when new. What matters is that it is still hard 100 years later. Are you checking new slate or 100 year old slate? | ||
| KMero |
I am checking new slate. Does slate change through the years? I know some slates will fade a bit. | ||
| admin |
The best way to judge slate is by historical record. For example, Vermont unfading green, unfading purple, mottled green and purple, Virginia Buckingham slate, and others, have proven to be excellent long -lasting slates. Some Pennsylvania slates are also excellent, and some Vermont "sea green" slates are exceptional. However, any quarry can produce good and bad rock. The proficiency of the quarrymen is critical to the selection of good rock for roofing slates. You can also rely on lab tests to determine the quality of slates, but nothing is better than the test of time. The NSA web site (slateassociation.org) has some info on testing labs, etc. There is a materials standards page at http://www.slateassociation.org/standards.html |
