According to the 2012 irc the minimum r value for floor assemblies is r 13 in zones 1 and 2 r 19 in zones 3 and 4 r 30 in zones 5 and 6 and r 38 in zones 7 and 9.
How to insulate a cabin floor.
Directly beneath the flooring and between the joists fit foil backed insulation boards for example 25mm or 50mm celotex a compressed foam material between silver foil.
Approximately 70 of heat escapes through the floor and roof it is therefore essential to insulate them well.
Cover the walls with insulation from the sill plate to the plastic covered dirt floor.
I would also try to nudge you to insulate the roof as well.
Place the batts against the underside of the floor then cover with the hardware cloth securing it to the joists with a staple gun.
These are some of the basic options you will find to use as floor insulation for your log cabin.
The air space above the 9 1 2 inch insulation in the 12 inch joist cavity will help provide a warm floor inside the cabin.
Alternatively you could fill the cavity completely using r 38 faced batt insulation.
The two areas i would absolutely recommend insulating are your floor and roof.
The sill plate is the first piece of framing lumber and it runs on top of the crawl space wall.
It will provide additional insulating value for not too much more than what would be invested in the r30 insulation.
Cover your insulation with 5 mm 1 4 hardware cloth.
You may also be interested in this post on double glazing r and u values and log cabin thermal.
Insulating your log cabin s floor can save up to 20 of your annual heating costs when fitted properly and combined with the finished floor.
This size of metal screen should be small enough to keep out nuisance animals such as mice.
When you re using fiberglass batting insulation material run it about 6 inches or so onto the crawl space floor.
But you will find insulating concrete as well.
A closer look at the primary equipment.
When we built the addition to the cabin last year we skipped a few steps.
Insulating the floor log cabin flooring is made up of packs of tongue and groove boarding nailed to pressure treated bearers.
If you want to insulate a floor assembly by leaving the joist bays empty and installing rigid foam on the underside of the joists here are a few things to keep in mind.