Considering that over 33% of heat is lost through our walls, insulting them is a must for heat loss prevention and modern sustainable living.

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In its simplest terms External Wall Insulation is putting 4” (100mm) of insulation all around your home then plastering it to keep the rain and moisture out. Sometimes 6” (150mm) of insulation is used to achieve a better energy rating. There are a few things to sort out in order to place insulation all around your home, such as:

Window Sills:                                       Fitting deeper sills to allow for the 4” of insulation
Downpipes:                                          Need to be taken off and refitted
Doorbell, Lights, Sockets:               Need to be taken off and refitted
Type of Finish:                                     Smooth plaster, dashing, brick effect, etc.
Attached Garage:                                To insulate it as well or not?
Windows & Doors:                              If getting new one these need to be changed prior to External Insulation

It is a relatively straight forward process with the massive advantage that there is little disruption to the home- owner. A scaffolding is first erected around the house. The downpipes and external electrics are taken off. The
insulation is glued to the wall, starting at the bottom and working up to the Soffit. The next day the insulation is mechanically fixed (nailed) to the wall. After that beading is applied to the door & window reveals and all the corners. The base coat is then applied along with a re-enforcing mesh. Once dry, the final coat of render is applied.



If your house was built between 1930s-1980s, more than likely you have cavity walls, but there are other ways you can check.  If the size of the bricks is the same across your brickwork, you have cavity walls.  If you cannot see the bricks, check the thickness of the walls – if they are thinner than 32cm (12 inches) you probably have solid walls.  If you’re still not sure, contact us below and we can advise you.


The vast majority of heat is lost (above 30%) through the walls of your home. Once Attic insulation is complete the doors and windows require attention and finally the wall insulation. Doors and windows must be done first as external wall insulation wraps around the window reveal and touches the window frame to eliminate any thermal bridging.
Not only does external insulation keep heat in your home it acts as a heat sink so when the heating is off, the walls continue to heat your home, resulting in a more even temperature.

The major advantage compared to internal insulation there is a lot less
disruption and hassle for the home-owner. The insulation team can just get on with works outside while you live normally inside.

If your home is built with cavity walls it is vital that these are pumped prior to External Wall Insulation. Please contact us on 087-6089310 as we provide all solutions to insulate your home.

Generally the job takes 2-3 weeks to complete. Other advantages:

  • Adds considerable value to your home, 1% per BER increase
  • It does not affect the size of your living space
  • Makes your house more airtight, removing chilly draughts
  • Minimises heat leakage in areas that are difficult to insulate using other methods.
  • Greatly modernises the outside of your home, improving appearance and, depending on the finish used, provides increased weather protection.
  • When is done, it’s done forever, saving you money forever.

There is also a technical reason why external wall insulation is preferred. If we consider the diagram across. Without any insulation (initial state) there is a linear decrease in temperature across the wall from inside @ 20°C to outside @ -5°C . With external insulation the wall remains much warmer. The drop in temperature occurs through the external insulation therefore there is no risk of condensation or mould. However with Internal Insulation the point at which the cold wall hits the insulation maybe below the Dew Point which would cause condensation and possibly mould. The example shown is for a solid wall. A cavity wall does not have this issue due to the cavity.
I’ve done a short video here to show the difference between solid (in this case hollow block wall) and cavity walls.

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Not if it: ”constituted works which do not materially affect the external appearance of the structure so as to render the appearance inconsistent with the character of the structure or of neighbouring structures”. Call us. . we’ll find out for you

No. The structure of your house remains intact. The External Wall insulation is merely nailed to it. The external walls will generally be 4” thicker due to the insulation.

It is best never to kick footballs at externally insulated homes!


  • Rendered masonry walls
  • Rendered solid or hollow-block walls
    Solid concrete/brick walls


  • Timber frame walls
  • Steel frame walls 
  • Timber clad walls

NSAI Agreement assesses and certifies building products and systems, including external wall insulation systems, for their fitness for purpose, and keeps a list of currently certified systems. This list of Agreement Certificates can be searched on the NSAI website (www.nsai.ie). The list can be searched by product name, by manufacturer or by certificate number.
Note that the installer of the system must also be approved by NSAI.
Or simply just call us and we will forward the system certs and our NSAI certs.

There may be a requirement for additional venting in the soffit for the attic depending on your house type and the configuration of the attic. We need to do a site check to advise properly.

Beyond a general annual check for cracks, damage or moisture ingress its maintenance free. All our renders have a lifetime guarantee.


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