The patch should be adhered from the centre over the hole outwards with a firm hard roller.
How to fix a leaking flat garage roof.
Sweep debris away from the seam edges that you are repairing using a heavy broom.
When the membrane is completely dry apply the appropriate roof repair material such as roof cement tar or peel and stick patch.
Clean the area where you found the garage roof leaks.
A small patch can act as a permanent epdm roof repair for leaks and cracks.
If a leak is difficult to find enlist a helper and go up on the roof with a garden hose.
Prepare the roof area surrounding the leak by removing dirt debris and raised parts of the old roofing.
Apply an epdm primer and when touch dry add self adhesive rubber tape 3 around malleable flashing covering the hole.
Use a sponge to wash away as much dirt as you can along the seam that is leaking.
If you take that step be sure to cover the nail heads with tar roof sealant or peel and stick flashing patch.
Some roofers also suggest using 6d roofing nails to secure the blister flaps.
For example soak the downhill side of a chimney first then each side then the top on both sides.
Start low soaking the area just above where the leak appears in the house.