Author	[Modern View]
D Slater 07-25-2012 08:27:43 184.15.3.232 Report to Moderator	Want to leave inside center part of the roof peaked for clearance and don't like the sweating under the roof now. Also have extra metal. Thinking about putting the metal in for a ceiling with insulation between but won't be much space between the two. What concerns me if I try that. Will it still sweat or sweat between ceiling and roof? Thanks for any answers. [Reply]   [No Email]
Dusty MI 07-28-2012 19:26:17 108.86.37.202 Report to Moderator	Re: Metal roof and insulation ? in reply to D Slater, 07-25-2012 08:27:43   The roof boards for the steel roof on my shop, are 2x4's on edge. I put 3-1/2" fiber glass between the 2x4's and 1" thick foil faced foam, Thermex, on the bottom of the 2x4's. It's almost 30 years old and it does not sweat.   [Reply]  [No Email]
MarkB_MI 07-26-2012 03:01:55 66.87.0.87 Report to Moderator	Re: Metal roof and insulation ? in reply to D Slater, 07-25-2012 08:27:43   The easiest way to insulate a steel roof is to sandwich insulation between the roof sheeting and purlins when the roofing is installed. Of course it's a bit late for that now. Sweating is caused by lack of insulation. Adding insulation should help whether it's under the roof or over the ceiling.   [Reply]  [No Email]
42 M 07-25-2012 17:16:04 99.29.199.189 Report to Moderator	Re: Metal roof and insulation ? in reply to D Slater, 07-25-2012 08:27:43   Just be fore warned metal on the ceiling = a very noisy barn/shop. I worked in a truck mech shop like that and it was 2 times as loud as with foam board. In the current farm shop we have 1" plywood on side walls and 4" silver back insulation on ceiling and love it [pressure washer friendly to].   [Reply]  [No Email]
fergienewbee 07-25-2012 12:55:44 99.181.159.103 Report to Moderator	Re: Metal roof and insulation ? in reply to D Slater, 07-25-2012 08:27:43   Spray foam can be quite expensive compared to styrofoam, and it's not a DIY product. Larry   [Reply]  [No Email]
M w J 07-25-2012 21:21:14 66.6.1.21 Report to Moderator	Re: Metal roof and insulation ? in reply to fergienewbee, 07-25-2012 12:55:44   I just had closed cell foam sprayed last fall in a steel shed 50x70x18 I had 4 inches put on the roof and 2 in on the walls It cost me $15000 They would have did 2 in on the roof and walls for$11000 When it is - 10 degrees The walls on the inside feel warm to touch. It never drips I haven't put heat in it yet.They told me The R value is 7.5 per inch. It wasn't much higher for 2 in spray foam them the foam board and that would still leave air space to condense moisture. It is hard to put a dent the stuff .   [Reply]  [No Email]
JDseller 07-25-2012 09:01:41 208.126.196.144 Report to Moderator	Re: Metal roof and insulation ? in reply to D Slater, 07-25-2012 08:27:43   I have a shed that is attached to my old shop That I wanted to just insulate the slopes/rafters. I just put Styrofoams against the roof and then regular fiber glass under that. It is thirty years old without any problems. I have taken some of it down to install some lights and it was in good shape. I put it back up and it is still going good.   [Reply]  [No Email]
Dick2 07-25-2012 08:45:24 174.26.218.15 Report to Moderator	Re: Metal roof and insulation ? in reply to D Slater, 07-25-2012 08:27:43   Check with some of the metal building dealers or manufacturers if they have used CLOSED CELL foam to insulate metal buildings. If so, that may be the answer to the condensation problem. From what I've seen on some home improvement shows, water will not penetrate CLOSED CELL foam, but will penetrate open cell foam. So don't use the open cell type in metal buildings.   [Reply]  [No Email]