External Wall Insulation Depth

The thickness of thermal insulation is dependent on whatever type is required in order to create.

External wall insulation depth.

External wall insulation the external walls of a building are an important part of a building s overall design and since there are a variety of different ways to construct an external wall with a range of building materials it should come as no surprise that there are many different ways to insulate them. Measure the depth of your current insulation. For example if you have a type of insulation that has an r value of r 5 per inch of thickness you will need a depth of 6 inches of this insulation installed your attic to reach r 30 if you live in zones 2 or 3. Calculate additional insulation needed.

You can do this internally or externally for instance by insulating the inside or the outside of your external walls. The ones that let in air from the outside world. If your current insulation is only 5 inches deep you ll need to add seven inches of insulation to achieve the 12 inch r 38 rating. An external wall insulation system or ewis is a thermally insulated protective decorative exterior cladding procedure involving the use of expanded polystyrene mineral wool polyurethane foam or phenolic foam topped off with a reinforced cement based mineral or synthetic finish and plaster.

Just to be clear we only recommend insulating the external walls of your house ie. A word about words. Eaves width can be a deal breaker in that if the eaves are not wide enough to accept the insulation the cost of extending the eaves can outweigh the benefit of the insulation. R 38 is the industry standard and the minimum thickness for r 38 is 12 inches.

Standard fiberglass insulation batts or blankets provide an r value of 2 2 to 3 8 per inch of thickness. External insulation will add thickness to the wall most evident at the reveals and eaves. Internal wall insulation involves the application of insulation to the interior face of external walls in order to improve the thermal performance of the property. England new dwellings.

Most manufacturers produce an r 13 batt that fits into a 2 by 4 wall cavity which is. Once the insulation is in the wall and sealed up with drywall it is not easy to change out. These r values are a sum meaning this should be the total r value once you add up the entire depth of insulation. There are four main methods of installation the most common but not always the most effective is building a new stud wall to which insulation can be added.

Our guides to building regulations in england adl1a 2013 building regulations. A u value of 0 55 w m k is used for cavity insulation and 0 30 w m k for internal or external wall insulation.