Cavity Wall Insulation

cavity wall insulation, attic insulation, blown cellulose insulation, insulation r value, blown attic insulation








Cavity Wall Insulation

One of the best ways to save huge amounts of energy for your home in installing the best cavity wall insulation you can afford.

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In order to be well educated in green home insulation techniques, you should know were the various areas of insulation are best used. This article will address the use of many varieties of insulation that can be installed in the cavity wall spaces of our homes.

Some of these are suitable for both new and existing constructed homes and other are suitable only for new construction because of accessibility problems with existing wall surfaces.

Rockwool Insulation from CertainTeed

CertainTeed Rockwool Insulation

Cavity Walls - The Key To Cavity Wall Insulation

Cavity walls are generally air spaces that are formed between exterior wall framing members, bounded on the outside by exterior sheathing and the interior by plaster or drywall.

It is in these open spaces or "cavities" where we have a great opportunity to locate our cavity wall insulation. If you think of the wall cavity similar to the cavity in a tooth that a dentist fill in, the contractor fills in wall cavities with an insulation product.

Spray Foam Insulation Available From CertainTeed

Spray Foam Cavity Wall Insulation - CertainTeed

Insulation types for the Cavity Walls:

As you will find out, there are many special varieties of insulation that can be used to fill wall cavity spaces.

Batt-Type Cavity Wall Insulation: Placed between the space cavities, fiberglass cavity wall insulation varieties are manufactured in either batts or blankets. Batt insulation is typically used in new home construction when the wall is open, before drywall is installed.

Batt insulation provides a outstanding opportunity for you to choose some outstanding environmentally friendly insulation products.

Fiberglass insulation produced partially from recycled glass is the most used, most intimate sort of batt insulation. It is additionally commonly the most affordable type of insulation for a cavity wall.

An even more compelling green insulation is produced from recycled and scrapped cotton fibers, that in produced into batts and blankets.

Various Backings Available for Batts

Selection of Backings For Cavity Wall Insulation

Rockwool Insulation: which is additionally referred to as mineral wool insulation is another environmentally friendly option for cavity wall insulation. Rockwool Insulation is produced from recycled slag or natural stone products.

CertainTeed Fiberglass Batts

CertainTeed Fiberglas Cavity Wall Insulation


Cavity Wall Insulation - Blown-In and Spray-In Types:

If you are planning on insulating existing wall cavities a common option is the blown-in insulation type. This insulation is easily installed in existing wall cavities through small holes drilled in the drywall or exterior sheathing by a licensed professional installer.

Cellulose insulation, created from recycled paper, is a common form if blown-in insulation. Also, another very environmentally friendly options is blown-in rockwool insulation, which is available in a blown-in form.

The forms of batt or blown-in insulation that we have been discussion herewith all have very comparable R-values of between 3.0 and 4.0.

A more recent cavity wall insulation that is gaining a lot of traction in the eco-friendly community is spray foam insulation. Foams are typically installed in new home construction by spray-applying directly on the surface of the exterior wall sheathing.

In existing wall cavities small holes are drilled in the drywall or exterior sheathing. In both applications, the foam is allowed to expand, completely filling the cavity and elimination any voids.

One notable aspect of the spray foams is some varieties possess a much higher R-value per inch of thickness than the batts or blown-in varieties.

The R-values of loose-fill insulation can degrade over time, especially if the product is blown-in dry, and this can reduce its efficiency.

Insulation Types Available From CertainTeed

Cavity Wall Insulation Types by CertainTeed


Proper Installation of Cavity Wall Insulation

As with anything the product is only as good as the installation, and this goes double for cavity wall insulation. To be truly effective and very energy efficient, all cavities need to be filled completely and completely without any gaps, voids or incomplete coverage, to minimize air and moisture infiltration. Blown-in insulation tend to settle over time, leaving gaps at the tops of the wall. Batts, even when installed properly leave little gaps and void in the cavity walls. Spray-foam insulation, which completely covers and fills every gap in the cavity wall and stays in place, holds the advantage here.

Cavity Wall Insulation Costs

Insulation costs can and do vary widely due to fluctuating market costs, construction costs, demand for the product and product availability around the country. For comparison purposes, lets analyze the relative costs of these different insulation types for a square foot of wall that is insulation to an R-value of 19.

The most costly cavity wall insulation would be the spray foams, next lowest cost would be rockwool mineral batts, then cotton batts and fiberglass batts and the least pricey would be the blown-in cellulose.

Another important step in green home insulation is to partner with a qualified contractor who is very experienced in green constructing and a qualified environmentally-friendly home design professional to help you choose the best environmentally-friendly products for your new home.

Do not neglect the return on investment or the payback in energy savings when making decisions on home insulation. The first cost or ongoing constructing cost is not the only factor to investigate.

Other insulation articles you may be interested in:

Blown Attic Insulation
Blown Cellulose Insulation
Green Insulation
Insulation Types
Rockwool Insulation
Soy Insulation
Spray Foam Insulation

DOE Recomended Levels of Insulation

Department of Energy Recommended Insulation Levels Map

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