[Stubits]

We're just about done with the design phase of an addition to our 1933 DC row house. I plan to do most of the work myself and would like to be able to do the roof too. The addition has a modest footprint of 5'x10' and requires a roof with a 2:12 pitch or less. Our architect has called for asphalt shingles and has indicated certain brands that allow that pitch. She has also called for us to install ice and water shield over the entire roof. We will also be sealing the underside of the roof with closed cell spray foam insulation doing away with the need for ventilation. Based on what I have read, on the internet and in elsewhere, I am really uncomfortable using shingles for a roof of this slope, it just doesn't seem to be the best product.

I would like to install an EPDM roof. It seems more DIY friendly than other materials and it seems as though I can probably cover the whole roof with one piece and no seems. I have a couple of questions though. I have attached some images to give you a feel for what I am dealing with.

1) Does this seem like the right way to go? Is EPDM a good choice here? There's plenty of sun, no trees above, so no debris.

2) It seems like I would want to run the EPDM material up the existing brick walls on the back (north) and side (east wall), up and under the current parapet roof cap. Is that right? How difficult will it be to remove those parapet roof caps (how are they usually held on)? Is there any need to replace the caps? Will I use a termination bar to secure the EPDM under the cap?

3) I assume I will install a drip edge along the front (south) wall where the roof drains into the gutter, correct?

4) What type of an edge would I install along the remaining edge, left or west side of the roof? Is there something that will help to keep the water from spilling over onto my neighbor's property?

5) Also, what do I need to do at the vertical termination on the southernmost part of the east wall?Obviously the EPDM will be adhered all the way up the side of the wall, but what do I do at that outside corner?

Any other thoughts, comments, concerns?

Thanks so much!

[manhattan42]

You're architect is wrong.

No shingles manufacturer's allow their products to be installed on slopes of 2:12 or less... and building codes usually restrict the installation of asphalt shingles on slopes of 3:12 or less.

As to the EDPM membrane, it can be a good option but you normally must be certified by the manufacturer to install an EDPM roof or there will be no warranty after you do the installation.