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Roof vent offset strips/shims necessary ?


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Re-roofing our 1986 Dolphin with EPDM liquid roof soon.

We removed all vents and noticed there are 4 extra strips or shims made of 1.5 inch x 5/8 thick plywood on top of each support where the vents mount.

So the vents end up being installed about 3/4 of an inch above the plywood level of the roof.  Does anyone know why?  Is it so water drains away from the vents?  A "screw receiver" for mounting?

It makes walking on the roof seem pretty dicey - all that flexing of the aluminum between the vents. Plus puddles during rain are the norm between vents after a while.

 

Is there something missing from our roof structure between the vents and sidewalls? Or should the vent strips not be there?

 

Thanks for any help . . .

Sam

roof-vent-hole.jpg

roof-vent-strip-detail.jpg

Edited by samsterid
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