FAB Concrete Roof

Hi Amielord,

I was waiting for someone else to shed some light on the subject but so far it has not happened. Please tell us what a FAB concrete roof is. I am getting to hate acronyms, particularly when I have no idea what they mean...FABulous? Pre-FAB? Please enlighten me.

Perhaps you could provide your proposed detail at the edge of the plinth. Then, we may be able to offer some constructive ideas.

Dear Bruce,

FAB is short form of Factory Assembly Building, usually its have big roof made of concrete and covered by layer of 1) liquid waterproofing,2) rockwool insulation and 3)TPO(Thermoplastic PolyOlefin) membrane (for air,water and sound proof purpose). These layer will follow exactly the concrete roof surface... hereby i attached some edge plinth detail dwg for your review.

Hello Amielord,

You may find some useful information here: http://www.jm.com/roofing_systems/cad_details/607.htm

There are numerous autocad details available on that site which you may download.

The thing you call a plinth, I would call an upturn. I assume the reason for the two upturns is to provide an expansion or control joint at that location. You will need metal flashing over the upturns to prevent ingress of rainwater and snow. You probably should have a 45^o cant strip where the roofing meets the upturn.

Roofing membranes are not my specialty, but I understand that TPO roofing is still in an experimental stage, so you want to watch your legal liability. Perhaps other CR4 members are more informed than I on that subject.

Hope this has been some help.