Compressed Attic Insulation

Install the rafter vents.

Compressed attic insulation.

We can compress insulation and increase the performance of it right up to the point where the main mode of energy transfer is through the material of the insulation itself. Simple thermal analysis reveals that if you have 5 missing insulation in an attic bare sheetrock you ll have a slightly more than a 54 drop in r value. Designed to eliminate r value loss caused by compressing standard r 38 products in 2x12 cathedral ceiling construction. Of ventilation air space between the insulation and roof deck.

Protect the heater flue. Choose your insulation type and material 1. 0 75 6 25 0 12 or 12 compression. The chart below indicates the compressed r value of standard building insulation products.

Use spray foam in large. When installed in framing cavities with a depth that is less than the labeled thickness of the insulation. Insulation will not slump within the cathedral ceiling cavity. There was no plywood up there plus it looks like the insulation is not uniformly compressed.

Caulk the gaps and wrap the water lines. These thermal defects undermine the r value of your attic insulation. R value simply means resistance to heat flow. 6 25 batt 5 5 cavity depth 0 75.

Step 2 take that resulting figure and divide by the thickness of the batt to determine the percent compression. Achieving greater r values in attics the higher the r value the better the thermal performance of the insulation. Insulate the skylight passages. When compressed to less than its labeled thickness glass fi ber insulation will experience a reduction.

Loose fill insulation fibers are packaged in bags and blown in place to the desired depth and density using special. There is a path down the center of the attic that has the top 6 inches of insulation above the joists that appears to have been compressed by either some one crawling across the attic or laying a piece of plywood across the joists. Begin by sealing all air gaps in your attic. For wool types of insulation fiberglass mineral wool steel real wool etc while it varies based on material this is typically much denser than we are able to get it via compression on the job site.

Check the lighting and prevent fire hazards.