How to insulate a crawl space ceiling. Insulate the walls not the ceiling. An exterior horizontal laid flat skirt of insulation buried under the dirt would also stop a lot of heat loss if you were going to go that route of insulating and backfilling. Top tips for insulating crawl space.
Install the insulation with the paper vapor barrier facing up toward the heated living space and make sure the insulation fits tightly between the joists. Secure them with 2x2 cleats. Cut lengths of insulation to extend from the mudsill thats the 2 by board laid directly on top of the concrete wall down the wall and 2 feet out onto the floor.
The sill plate is the first piece of framing lumber and it runs on top of the crawl space wall. Eliminate sources of water in the crawl space before doing anything else. If your crawl space isnt ventilated insulate the walls of the crawl space rather than the subfloor of the room above.
You could opt for thick insulation with a radiant barrier and an r 11 value. This effectively insulates the crawl space itself as opposed to insulating the home from the air in the crawl space. Hold the insulation in place from below using insulation support wires or by stapling chicken wire to the bottom of the joists.
Foam board insulation is attached directly to the exterior structure walls of the crawlspace. Use an insulation that resists damage from water not fiberglass or. You may also want to install a polyurethane vapor barrier over the dirt floor for further protection.
For sure if most of the wall is exposed then r8 or so of insulation isnt a lot for manitoba. For this you could install a crawl space sump pump or drainage matting for the crawl space floor. Insulate your crawl space walls and the ceiling for maximum climate control.
Another solution depending on how easy it is to accomplish could be to add a couple of inches of eps rigid insulation to the exterior vertical portion of the wall and back fill it. Extend downspouts maintain gutters and regrade sidewalks patios and. Hold the cleat over the end of the insulation and drive nails through the 2x2 and into the edge of the mudsill.
Aim for as few seams as possible by installing large sheets of foam. It will keep out all the outdoor air. When youre using fiberglass batting insulation material run it about 6 inches or so onto the crawl space floor.
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