Go BottomInsulating Pole Barn Ceiling
 | u787517
Join Date: Oct 2020 Posts: 1 Georgia 
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2020-10-31 199773
The tin on the roof is nailed to purlins spaced 32” apart. In order to seal the roof and insulate and finish the interior, I am thinking I will need to remove the tin and replace the purlins with decking. Anyone have any suggestions other than install decking?
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 | greyhorse
Join Date: Jun 2013 Posts: 65
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2020-11-02 199776
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| chashm
Join Date: Oct 2013 Posts: 77 United States
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2020-11-05 199785
How are you going to ventilate the area under the tin roof? If you're going to put in a ceiling like in greyhorse's video, you'd usually put in eave vents to let air in and a ridge vent and/or a gable vent/fan to let hot air out .
If you want to leave the attic space useable (or you like the look), one way to do it is pull the tin, then put down sheathing or other decking. You may or may not retain the purlins. Rigid foam insulation goes on the decking, then vertical cleats so you have a air gap running up the roof then either put the tin on the cleats or purlins or sheathing then tin. Eave vents between every cleat and a ridge vent to let the air out.
Don't neglect a moisture barrier if your insulation can absorb water.
My great room has 5/4" tongue&groove for decking - looks great - but probably overkill for a barn. On the other hand, OSB sheathing ain't pretty.
You can put wiring in the airgap, so figure out any ceiling fixtures and fans up front.
Lastly, check with your building inspector before starting as he may have opinions he can enforce. ....
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