Compressed Attic Insulation

Insulation will not slump within the cathedral ceiling cavity.

Compressed attic insulation. These thermal defects undermine the r value of your attic insulation. 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. Subtract the cavity depth from the thickness of the batt in inches. Install the rafter vents.

Choose your insulation type and material 1. When compressed to less than its labeled thickness glass fi ber insulation will experience a reduction. There was no plywood up there plus it looks like the insulation is not uniformly compressed. Of ventilation air space between the insulation and roof deck.

Caulk the gaps and wrap the water lines. Find your zone on the map and then use the chart to determine the level of insulation you need to properly insulate your attic walls floors and crawlspaces. Begin by sealing all air gaps in your attic. The chart below indicates the compressed r value of standard building insulation products.

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. Designed to eliminate r value loss caused by compressing standard r 38 products in 2x12 cathedral ceiling construction. R value simply means resistance to heat flow.

When installed in framing cavities with a depth that is less than the labeled thickness of the insulation. 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. Insulate the skylight passages. Use spray foam in large.

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. 6 25 batt 5 5 cavity depth 0 75. Protect the heater flue. If you know you aren t going to convert the attic in the future that leads you one direction compressing the insulation is fine maybe you don t care so much about head height and can add some more thickness to improve the insulation etc and if you know that an attic conversion is viable and that you are likely to want to pursue that in the future you can plan accordingly.

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.