Insulating an older masonry building inside above grade and below
This building is located in the upper peninsula of Michigan. It is a church of about 40 people, with limited resourses. It has been heated with an oil furnace since it was built in 1955. The furnace has failed this winter, and they want to switch to propane. Our church is in the lower part of Michigan and our men's group is willing to go up and do the work of insulating and drywalling the interior walls of this building, with all labor donated.
The interior walls on the above grade portion are cement block with brick on the outside. The bricks appear to be 3" x 12" in size if that means anything as to the content of them. The basement walls are cement block waterproofed and the in contact with the earth.
I have been researching the best ,cost effective way to accomplish this and am becoming more and more wary of doing the wrong thing .
My first method was to install 1" of closed cell rigid foam directly to the blocks and then apply 1" nailing strips of wood with another layer of the 1" rigid foam between the nailers. This would only give approxomately 8.4 R value and the people feel this isn't enough.
The second and most expensive option was to use metal 3" z chanels with sprayed closed cell foam 2-3" thick giving an R value of 13 to 18.
My third was to use a solid layer of 5/64" reflective insulation against the blocks, then the 1 or 2" nailers with another layer over the nailers and drywall over the top trapping air for the added R value. This I think would give a conservative estimate of near R-20.
Are any of these methods viable? Should I be concerned about moisture condensation? Or should I use one method above grade and another below grade? Which would work best?
Posted Sun, 03/02/2014 - 20:36
Edited Mon, 03/03/2014 - 06:08
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