Cheapest Insulation

The cheapest insulation is not always the best buy. The cheapest insulation per R value is the fiberglass roll insulation. This comes in different widths and thicknesses for your convenience. Do not use insulation made for 2 x 6 studs in 2 x 4 studded walls. You will have to crush the insulation in, therefore decreasing the R value. The cheapest board insulation is probably the Styrofoam type. This insulation has very low R value breaks very easy. You will be better off getting a high density foam board insulation. Stay warm this winter, insulate now.