Achieving greater r values in exterior walls in exterior walls add insulating sheathing to achieve a greater r value in your wall system.
Attic insulation layers.
Because of this this method will normally require you to hire a professional.
Plan to pull up the flooring and layer new insulation on top of the old.
A guide to proper attic insulation.
You can achieve better thermal performance in your attic by adding an additional layer of insulation.
Blown in insulation consists of bags of fiberglass or cellulose that are chopped up and blown in to the attic or wall from a machine.
Because the simplest and cheapest way to insulate an attic is to add material to the floor.
The best approach for a vented attic in a cold climate is installing a layer of drywall with a good coat of latex paint the paint creates a semi permeable vapor barrier.
So with cold weather.
Although installing insulation in an unheated attic is usually a fairly straightforward job a variety of pitfalls await the unwary.
The insulation fiberglass or cellulose is then placed on top of the drywall with no vapor barrier above or below.
The higher the r value the better the thermal performance of the insulation.