Use a box cutter to cut the insulation to length. Properly insulating and air-sealing rim joists (band joists) takes patience, so most builders simply stuff in some fiberglass and walk away. If you have an unfinished basement, you can properly insulate the rim joists in two or three hours.
Does Fiberglass Insulation Have to Be Covered? Posted on April 12, 2017. It's not uncommon for homes to have exposed fiberglass insulation in the basement or attic. Pink, fluffy batts wedged tightly between studs, rafters, and joists insulate the space against exterior temperature changes.
When finishing a basement to create either additional living space for items such as a game room, bar or spare bedroom, it will often be necessary to install a new ceiling. Overhead objects such as HVAC duct work, plumbing and electrical items can make this difficult.
Before You Start. Note: Building and fire codes require that both fiberglass blankets and foam board insulation be covered with drywall or other finished walling (see Step 1). Before you just start throwing insulation on your walls, you'll need to solve any basement water leaks, dampness and air infiltration issues.
And now that your basement is going to be cold in the winter, you'll also need to insulate any ductwork and hot-water pipes that are below the ceiling, weatherstrip the basement door, and wrap a thick layer of fiberglass around the water-heater tank. In other words, you're in for a lot of work.
Fiberglass insulation is less than half the price of rigid foam insulation when calculated by R-value per square foot. For example, insulating a 10-square-foot wall area to R-15 costs about $3.40 to $4.00 with fiberglass insulation, while a comparable R-value for rigid foam costs roughly $10.