Ways-to-insulate-attic, attic insulation is installed in the floor of the attic, so you'll need to do a few things to make the process straightforward. start by installing temporary lighting, such as clip lights, and laying a few sturdy boards along the joists to create a walkway.. Insulating a finished attic there are two basic ways to insulate a finished attic. if only the living space will be insulated, wrap the insulation around the room’s walls and ceiling and then continue along the floor of the non-living space. in this case, the area behind the knee wall will be uncomfortably hot or cold., because the simplest and cheapest way to insulate an attic is to add material to the floor. but if the floor is covered in plywood, you can't stuff enough insulation beneath it to do the job sufficiently—not even in warm climates. plan to pull up the flooring and layer new insulation on top of the old..

If you don’t like the idea of blowing fiberglass to your attic floor, you can spray open cell foam in its place. open cell foam has an r-value of about 3.7 per inch, but at 3-1/2″ you’re achieving a complete air barrier., depending on the size of your attic, and desired thickness of insulation you may need to by 50 bags or 5 bags. remember...the thicker the insulation, the higher the r-value, and the easier it is to heat/cool your house. i recommend using an electric leaf blower due to the enclosed area and start-ups and shut-downs, but mostly for overall safety..

The unvented or improperly vented bathroom. this is perhaps the number one cause of excess attic moisture, mold and roof rot. unfortunately, building code allowed excluding bath fans if there was an operable window in the bathroom., rolls and batts of insulation are an easy method to install insulation in floors. the rolls are made of fiberglass, mineral wool and natural fibers and are designed to fit the standard spacing....

The most direct answer to your insulation question is fairly simple. your goal should be to have insulation equaling an "r" value of 40 or above on top of the ceiling of the second floor. the cheapest method for a diyer is to roll out unfaced fiberglass insulation over any existing insulation. we don't know what you have now, "r" value or type., once you have the materials, you can begin to seal and insulate the knee wall access door through these steps: from inside the attic, check for any openings, holes, or fenestrations into the knee wall/surrounding area. use spray foam to air seal these openings if they exist. apply weather-stripping to the door to create a seal.