Kurt, why would you not want silicone used? This may be another climate thing, but I always recommend polyurethane or silicone caulk for this. Roofing tar won't last more than 2 - 3 years down here. It dries, cracks, and in small thin patches like those over nailheads, will simply fall off in time. I've seen silicone up to 10 - 12 years old, still flexible and holding. I've also seen it curling-up a few times....don't know why. You know how we're told that our kids are ignorant in geography? Well I find adults to be little better. If you take out a globe, put your finger in the middle of the South, then turn the globe so that your finger tracks across the Atlantic Ocean, where does your finger make landfall again? Most people say "Europe". Wrong...North Africa. We never think of it as such, but the American South is basically a sub-tropical region. The native trees are Pines instead of Palms, but the weather is the same. Brian G. Looking Forward to Sweating a Little [:-cold]