Will Schaefer
01-03-2011, 04:18 PM
Hi All, I'm amid a DIY bathroom renovation in a 1908 brick rowhouse, Washington, DC. I want to add venting to the bathroom on the second (top) floor and the kitchen range hood on the first floor (the kitchen is directly below the bathroom). There is very limited wall space at this end of the house to allow a vent through the outside wall (close to chimney, doors, windows, neighboring rowhouse). There is also virtually no roof edge eave/soffit to speak of (the rain gutters are practically mounted to the wall). So my hope is to be able to hire my roofer to run both vents through my flat EPDM membrane roof. Finally, there happens to be a roof access hatch through the bathroom ceiling--aesthetically it's unfortunate; practically it is convenient to not need a 40'+ ladder...
My questions are two:
1. Given I am trying to limit duct lengths, what limitations do I (or my roofer) need to find out as to how close together roof penetrations such as these (soil stack vent pipe, roof access hatch, chimney, kitchen exhaust duct pipe, bathroom exhaust duct pipe) can be?
2. I assume I should insulate both ducts in the crawlspace. If so, what type of insulation for the range hood? May I use polyurethane foam-in-a-can for this?
Thanks in advance for your thoughts!
My questions are two:
1. Given I am trying to limit duct lengths, what limitations do I (or my roofer) need to find out as to how close together roof penetrations such as these (soil stack vent pipe, roof access hatch, chimney, kitchen exhaust duct pipe, bathroom exhaust duct pipe) can be?
2. I assume I should insulate both ducts in the crawlspace. If so, what type of insulation for the range hood? May I use polyurethane foam-in-a-can for this?
Thanks in advance for your thoughts!