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Old 11-20-2019, 05:22 PM   #16
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Re: Condensation on roofing H-clips


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Yeah.....with any shed roof coming off another structure it's somewhat difficult to vent. In my case dealing with shorter exterior walls, maintaining the existing trailer pitch and keeping the header above the doors/windows, I was left with one option...... flush beam. This leaves no space to vent like a typical roof. She does have a propane deck heater....not sure if she's fired it up though.

You could a couple box vents or smart vents near the top but they would be visible from below. Your home owner needs to be brought up to speed of what causes the condensation.


smart vent.
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Old 11-20-2019, 05:36 PM   #17
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Re: Condensation on roofing H-clips


Just thinking possibly a ceiling fan may assist canceling condensation when RH approaches 100%.
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Old 11-24-2019, 03:14 PM   #18
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Re: Condensation on roofing H-clips


She's going to slather any metal with some Leak Seal. I have doubts that it will work due to the high humidity levels lately....relative to the OSB that is. Next options would be box vents...<....or finished in soffit material (most likely)...being that one box vent would basically pick up the humidity between 2 rafters. Definitely help....but. Humidity levels are above 95%...somewhat uncommon for this time of year. Even some of my soffit area is somewhat damp.....so it looks like I'll be covering it up in the next few days.
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Old 11-24-2019, 03:44 PM   #19
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Re: Condensation on roofing H-clips


No window pans?
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Old 11-30-2019, 12:09 PM   #20
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Re: Condensation on roofing H-clips


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No window pans?
Not sure why I posted that pic...lol....but...due to availability/cost and time frame I made my own pan with the Tyvek. It''s returned inside and taped, including all the inside corners. No water will get in there on my watch...lol. Structure still has to be moved and until after that all the bottom of windows will be taped shut. Most likely cut a one inchish slot out of the tyvek (around the windows) and seal the tyvek to the OSB with some self sealing flashing tape/membrane....before the exterior finish is applied. Top of the window can't be properly taped or drip cap installed until I determine width of window trim.
On another note.....I installed some metal soffit on my eaves. The next day I slide it all back out and had a look. It's better....but the underside of OSB still has some frost on it....which I figured it would....lol. One option would be to seal the soffits right up...but I'm not sure how hot that space would get in the heat of the summer possibly creating humidity/moisture? Maybe install some tar paper/Tyvek to the bottom of rafters and stop the vapour before it condenses on the eaves....still utilizing the metal soffit of course. This is low slope non vented hot roof with EPDM on roof deck...4.5 inches of closed cell/R22 batt in ceiling, approx 50+ R value
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Old 11-30-2019, 12:51 PM   #21
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Re: Condensation on roofing H-clips


This has been code in BC since 2006 but now they have added a 1x inside the window so that blue flashing rolls up inside.

I don't know enough about the foam on the roof sheeting

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Old Yesterday, 11:33 AM   #22
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Re: Condensation on roofing H-clips


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You could a couple box vents or smart vents near the top

smart vent.
I've researched smart vent before and was a little confused if you use it down low as an intake for the warm air to vent at the ridge. Seems like since it's actually installed in the roofing, that during the summer it would let in extremely warm air from the heat coming off the roofing. I guess in the OP's case it would be a good consideration.
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Old Yesterday, 11:46 AM   #23
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Re: Condensation on roofing H-clips


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I've researched smart vent before and was a little confused if you use it down low as an intake for the warm air to vent at the ridge. Seems like since it's actually installed in the roofing, that during the summer it would let in extremely warm air from the heat coming off the roofing. I guess in the OP's case it would be a good consideration.
Smart vent would be placed high as possible on the roof. Wouldn't be very effective in this application since the OSB roof deck is directly over rafters....so basically one smart vent would only vent the space between 2 rafters. If the roof was strapped with 2x4s or have a truss design then it would be a different story. But since this is a low slope roof.....a solid/sheeted deck is required.
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Old Yesterday, 12:17 PM   #24
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Re: Condensation on roofing H-clips


A smart vent is like a ridge vent that can be used at the top of a shed roof against the house or low on a roof that has no soffit vents.
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Old Today, 10:36 AM   #25
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Re: Condensation on roofing H-clips


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or low on a roof that has no soffit vents.
That's the application that doesn't seem like it would work well. In the summer you would be sucking really hot air coming off the roofing into the attic. As a ridge (exit) vent system it would seem ok.
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Old Today, 11:24 AM   #26
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Re: Condensation on roofing H-clips


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That's the application that doesn't seem like it would work well. In the summer you would be sucking really hot air coming off the roofing into the attic. As a ridge (exit) vent system it would seem ok.
It would only suck air in if the air inside was rising so it would have to be hotter inside. It is only used when there is o other way.
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