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If you are getting ready to order materials for your flat roofing system, one item you can’t leave off the list are termination bars.
Termination bars are strong metal strips that are designed to support a roofing membrane system at it’s termination point on a vertical surface.
First, ensure the rubber membrane extends a minimum of 25 millimeter on to the adjoining roof surface.
Hold back the rubber membrane and apply a bead of water cut off mastic directly to the surface to be joined on to.
Position the termination bar over the rubber membrane and directly over the water cut off mastic bead.
Using the pre-drilled holes in the termination bar, screw the termination bar in place using the fixings provided. You need to ensure that the EPDM washer creates a complete seal.
Be sure that your screws (do not use roofing nails) are the correct length and type for the underlying roof.
If you are joining the rubber membrane to a built-up roofing system there might be an extra layer of insulation installed. If so, you will need extra long roofing screws to reach the underlying deck.
Ensure that the termination bar is installed in a way so that when the bar is screwed down, the mastic squeezes out water as this is specifically designed to work under compression to form a seal the mastic stays tacky throughout its working life.
Do not substitute water cut off mastic with silicone or other types of mastics.
Trim back the excess rubber membrane being careful not to cut the underlying roof material.
Apply a bead of lap sealant to the edge of the termination bar to create an additional seal between the EPDM rubber membrane and the underlying roof material.
When properly installed, a termination bar is the best way to finish off flashings on a TPO roofing system (or other flat roofs).
Don’t make the mistake armatures make and think you can use a termination bar on the wrong surfaces. Talk to your roofing material manufacturer so you avoid any problems with your roofing warranty.
There are times when a termination bar makes sense and there are times when you should consider a simple drip edge or coping cap.
Hopefully, we answered your question, but if we didn’t, comment below and we will answer or find someone that can answer.
Thanks!
