R 38 Ceiling Insulation

To achieve r 38 you can use two layers of.

R 38 ceiling insulation. The table below shows what levels of insulation are cost effective for different climates and locations in the home. Johns manville r 38 64 sq ft faced fiberglass batt insulation 24 in w x 48 in l. 10 thick r 38c ecotouch thermal batt insulation prevents moisture damage and help assure long roof life by providing 1 of ventilation air space between the insulation and roof deck.

30 grains of black powder will drive that lead ball just fine. Johns manville r 38 42 66 sq ft faced fiberglass batt insulation 16 in w x 48 in l. An insulation value of r 38 is at the high end and requires a minimum thickness of 12 inches.

R value is a measure of insulation s ability to resist heat traveling through it. The higher the r value the better the thermal performance of the insulation. Sized for proper ventilation r 38c ecotouch thermal batt insulation is designed to eliminate r value loss caused by compressing standard r 38 products in 2x12 cathedral ceiling construction.

Here s what i mean. 90 grains might be approaching the ma. And owens corning ecotouch high density insulation products are designed specifically for these rafters.

The rafters in cathedral ceilings are usually made of 2x10 ft. An r 38 fiberglass batt should be approximately 12 inches thick while the thickness of cellulose insulation of a finished fitted product will larger. The fiberglass comes in rolls also known as batts which vary in size.

R 30c and r 38c are. Knauf insulation r 38 ecobatt kraft faced high density fiberglass insulation batt 10 1 4 in. Whoa whoa david oswald you ve just entered the domain of the law of diminishing returns.