Upgrading walls in 1970's house

[michaelinho]

I am seeking advise on what would be the best options to improve the insulation value of the walls of a 1970's Irish house. I would assume that there is some form of minimal insulation in the cavity wall but I am wondering would it be more beneficial to a) insulate internally b) insulate the cavity by pumping beads/foam or c) insulate externally?
My aim is to achieve a passive u-value in the walls.

Thanking you in advance.

[jeremy.horwitz]

Foam insulation is applied to finished areas that need extra insulation because of factors such as cracks or air leakage through doors and windows. Spray foam insulation is one of the most popular forms of this type of insulation. Cements, phenolic, polysaccharides, and polyurethane are four material types of spray foam insulation. High Density polyurethane foam alone has an R value of around 6.8.
Loose-fill insulation, which must be blown in to be installed, is best saved for places where other forms of insulation are not well-suited, such as attic floors and places that are difficult to reach. Cellulose (as loose or pellet fibers), fiberglass, or rock wool are generally the types of material used in loose-fill insulation. Blown cellulose carries an insulation R value of 3.7, and fiberglass holds an R value of 3.14
Though the information above will help you search for the best insulation material, do understand that climate and temperature play a defining role in determining what R value is best for your home.
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Greentech are specialists in a range of Attic Insulation (http://www.techstore.ie/Renewable-Energy/Attic-Insulation.html) Services.