Guest User
1/3/2018
I have a home that is an ongoing project .....the roof is a metal roof G rib I believe 29 gauge? It is a steep slope, we have 3/4 furrings on the trusts which gives a space. originally we did not put any insulation board on the underside of the roof we just screwed in the panels and insulated the underside with fiberglass insulation. The upstairs does not have any heat or ac yet installed. we are currently living on the first floor of the home. We noticed that during the colder months that we have a dripping occuring from the roof. We then cut insulation board .5 thick and put between the trusts and then put fiberglass insulation in. The other section of the house we ripped off and decided to go up with it and matched it to the existing roof. With that we chose to put .5 insulation board on the furrings this time before we put the metal roof on this section. We still have no heat or ac and yet again still during colder months when frost is on the roof and the sun rises to warm it drips. My question is once we complete all insulation (.5 insulation board and fiberglass insulation) and then put sheetrock up and have heating unit would we still have the dripping? at that point would be hard to know unless sheetrock shows signs of moisture. Have been told that once the space is insulated and sheetrock goes up and is condition with the heat that it wont drip any more but I am concerned cause at that point a real costly expense to fix and would just have to replace whole roof. any help thoughts would be great....thanks in advance
Todd Miller
Isaiah Industries, Inc.
1/3/2018
I am never a fan of residential installations without solid decking as they just pose an increased risk of condensation. Condensation of course occurs when warm moist air hits a cool surface. The ways to keep that from happening are: 1) Insulation 2) Ventilation 3) Vapor Barrier You can usually get by with just 2 of the above 3 but pretty much never can you get by with just one. Right now, you have just one (insulation). When you drywall, you can put up a vapor barrier and that might prevent the condensation. It really depends upon exact moisture levels inside the home. If you could add ventilation to the system as well, I think you can probably get the condensation stopped. I hope this helps. For now, try to reduce the ambient moisture in the home and keep any air circulation fans including the one on your furnace running all the time.
Guest User
1/5/2018
Thanks for your quick response. I really appreciate it.

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