more thoughts on Fire department questions [RE-wrenches]

[Graham Owen]

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Hi Jerry,

Good questions, thanks.  I don’t think roof penetrations properly sealed
should impact roof fire ratings.  Most HVAC, air handling, electrical,
etc, equipment I see on roof-tops are all metal and non-flammable which
makes me wonder if metal flashings are better for high fire risk
locations as opposed to Oatey style flashings with rubber boots which
are often used for mounting PV arrays?

For a couple of decades high fire risk areas of LA County mandate metal
solar pool heating panels and disallow plastic panels. Even though
plastic panels are typically flush mounted which presents a lower
possibility of burning embers getting underneath, while metal panels are
often elevated several inches off the roof on standoffs.  

Perhaps as the decades slip by, class A roofs would do better in the
event of a loose connection arcing on the roof.

BTW
 fire and rescue personnel use a hand-held device called a
“hot-stick” to determine if wires and/or components are electrically
energized, but they will not detect DC voltages.

Graham

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