Tying in Torch down Roofing to EPDM

Sherryfr

I want to replace one section of my flat roof with torch down roofing tying into another flat section that has EPDM on it. What are the hazards in doing this? Can this be done safely?

Thank you.

OldNBroken

Well, let's start with by you replacing it do you mean you will be the one installing it? That would be your first and biggest hazard unless you have proper experience. Second, rubber and asphalt do not mix. You have to create a separation between the two decks.
Peruse a few of the hundreds of previous "torch down" topics on the forum and you will get an idea of opinions about DIY'ers doing torchdown.

Sherryfr

No we are not doing it. Just wanted to know how that goes. I didn't think it was compatible. Thanks.

1985gt

there is a couple of ways you can do it.

1.) build a divider wall. Depending on roof slope this may or may not work. A simple 2x4 nailed to the deck with a 2x6,8,10 your choice nailed on edge. Flash the Torched side first lap to top of 2x on edge, flash EPDM side last and let it wrap over the top and down the other side 3-4 inchs, cap nail off and put a cap metal on it.

2.) at tie off area on epdm side burry the EPDM under a 2x4 and water stop the heck out of it. then let your torch roof go over the top, making sure not to heat up the rubber. Anchor bar down threw both layers and mastic and membrane the lap. (this is not ideal) but in any case if one side leaks it wont transfer over to the other/new material.

3.) and best option. Use EPDM on the new roof.

Sherryfr

Thank you. Can't do 1 or 2 because of roof drains. Option 3 is good. Or, Option 4 replace all with torch. Have a great day!

1985gt

2 you could do but its not ideal, I would go with 3 or 4 or even better tear it all off and hot mop one on there

Talos4

What he said.
Seriously, Tie ins even when done properly can cause problems.

Leaks!