Sugar Shack Ceiling

[TapTapTap]

I'm building a new sugar house with a metal roof on a 12/12 roof pitch. I'm thinking that drip will be somewhat mitigated by the steepness. Does anyone have a similar pitch metal roof? Any suggestions out there?
Thx
Ken

[wnybassman]

Ours is a 12/12 with metal roof, but I put down plywood first.

[johnallin]

Ours is timber framed with 3x6 hemlock rafters on 24" spacing. Used southern yellow pine 2x6's as sheeting then went with metal roof. We have no condensation at all, looks nice too..

[lyford]

I have a 12/12 pitch with 1x10 pine sheathing under the metal, only done a test boil as the shack is new this year but no dripping thus far

[mudr]

6/12 here. Metal, with the bubble wrap insulation below the panels, on top of purlins. I get a couple drops after 4 hours of boiling. That is with open pans (2x6) and one cupola door open (16 by 96 inches).

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[Haynes Forest Products]

The warmer the room gets the warmer the interior walls and ceiling will get and that will determine how much condensate you will get. It will settle on wood and stick. Metal will shed it off like rain.

[TapTapTap]

The warmer the room gets the warmer the interior walls and ceiling will get and that will determine how much condensate you will get. It will settle on wood and stick. Metal will shed it off like rain.

I don't believe that's entirely correct. The condensation is worst when the steam hits a cold roof and the uncovered metal surface will best transfer the outside chill. It is more about the temperature difference between the moist air and the lower surface of the roof.

My question is more specific to whether the condensate will roll down the steep pitch metal roof versus dripping. I already know covering the metal is better than not. And, I also know that a shallow pitch metal roof still drips.

[Haynes Forest Products]

OH OK I stand corrected.

[JoeJ]

When I built my sugar hose with a 9/12 pitch, I nailed 1"x4" purlins spaced 24" apart directly onto the 4x6 rafters. (Not knowing any better) During the first boil, the condensation dripped off the purlins every 24".
The next summer I installed 36" wide clear poly corrugated sheeting between all the rafters. It worked but was pretty expensive and time consuming compared to either plywood on the roof or using rough boards.

Joe

[wnybassman]

It worked but was pretty expensive and time consuming compared to either plywood on the roof or using rough boards.

Joe

Granted, my shack is fairly small, but doing the plywood base was a $200 "upgrade" from just doing purlins. Looking back, I am glad I went the route I did.