Replies

1. 
   sdr25 | Jul 04, 2002 04:18am | #1

   One roofing material that I know of that is specifically for low slope roof is a product ironically called Lo-slope by a company Monsey -something or another. It just sticks down like ice and water shield with the help of a tube adhesive along the edges. Easy to work with and a major improvement over old roll roofing.

   As you probably already know shingles are not recommended for roofs lower than 4-12. Personally I would go a different route with a slope that low, even with a layer of ice and water shield, but roofing is not my area of expertise either.

   Without a doubt it should be ventilated. Soffit vent with insulation baffles all the way to a vent along the wall roof intersection (you can get this specific vent just about any where)

   Scott R.
1. 
   crawdad12 | Jul 04, 2002 01:32pm | #2

   Thanks for the reply,Scott.   I'll do a search on the web or try my local supplier for Lo-slope.  Happy 4th

2. 
   Piffin | Jul 04, 2002 07:31pm | #3

   Two reasons not to re-roof with these shingles on a low slope such as this:

   >>Thet have a laminated seam at the midline that is more likely to open up under ice conditions so you can't count on headlap to help prevent leaks. Commonly, a standard shingle would be installed at 4" exposure on a low slope to increas headlap but that doesn't help with these and it can cause other problems with them.

   >>As you now enclose this space and add winter heat under a roof that previously had thermal stablity, top to bottom, you increase the odds of condensation and ice dams. These rafters barely give you enough space for insulation so I would add a layer of foil faced Thermax to the underside also.

   I would use the typ of product discussed above but if you are dtermined to shingle for the look, You would have to use ice and water shield on the whole area.

   Excellence is its own reward!
1. 
   crawdad12 | Jul 07, 2002 06:03pm | #4

   Thanks for the advice, I'll check my supply house for this Thermax product.  Dont need to shingle for the look so Ill use the lo slope or similar product.   Do you also feel that the roof should be vented at the soffit and where the shed roof meets the sidewall? Thanks again

1. 
   Piffin | Jul 07, 2002 09:31pm | #6

   Normaly I go for vents in a roof, but the only way for them to work is if air can flow from soffit to ridge for total ventilation. If you fing it hard to get the flow through, it's probably best not to vent this one and seal the ceiling instead. Tape the foil faced foam seams, caulk penetrations, and use good paint. If this is a north facing roof in an extreme climate and this room is a sauna or bathroom then all bets are off.

   Excellence is its own reward!

1. 
   WebTrooper | Jul 08, 2002 06:52am | #7

   Just curious - Wouldn't snow piling up against the upper vent pose a serious problem? Melt would run right into the vent and into the ceiling?

   - WebTrooper -

1. 
   Piffin | Jul 08, 2002 06:18pm | #9

   I meant it would have to vent through to the ridge vent.Excellence is its own reward!

3. 
   rjw | Jul 07, 2002 06:23pm | #5

   FWIW, I saw something that seemd to be  single ply membrane vents for the first time a week or so ago: looked like the attached photo:

1. 
   crawdad12 | Jul 08, 2002 03:42pm | #8

   Thanks again to all for the feedback.