How do I adhere and waterproof a metal roofjack to a previously foamed flat roof?

sulcraft | Posted in General Questions on September 10, 2014 11:43am

I am putting in a exhaust fan in the bathroom and need to vent it out the roof.

Answer

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Martin Holladay | Sep 11, 2014 07:38am | #1
Pat,
We need more information.

Is the spray foam installed as roofing (above the roof sheathing) or only as insulation (under the roof sheathing)?

If the spray foam has been installed under the roof sheathing, what material has been installed as roofing?
sulcraft | Sep 11, 2014 05:17pm | #2
It has been installed as the finished roof-above the sheathing.
GBA Editor

Martin Holladay | Sep 11, 2014 05:24pm | #3
Pat,
The type of spray foam used for roofing is very dense; it is a special formulation. To make sure that your installation is watertight, it's best to hire a roofer familiar with spray-foam roofing.