External Wall Insulation2018-11-20T15:42:59+00:00

External Wall Insulation is the perfect cost effective way to add extra warmth and give your home a brand new look.

What is External Wall Insulation?

External Wall Insulation (or EWI) is applied externally to your building through various insulating and protective layers and finished with an external silicone enhanced acrylic render or dash finish. Uninsulated solid stone or solid brick walls can lose substantial amounts of heat if left untreated.

Johnstone's Stormshield Silicon Finish

Johnstone’s Stormshield Silicon Finish

Johnstone's Stormshield Dash Finish

Johnstone’s Stormshield Dash Finish

Johnstone's Stormshield Brick Effect Render

Johnstone’s Stormshield Brick Effect Render

Johnstone's Stormshield EWI & Render Systems

How does Exterior Wall Insulation systems work?

Rigid grey expanded polystyrene (EPS) insulation boards which are enhanced with graphite for better thermal performance are applied through mechanical fixings to the outside of the property to create a warm blanket to the building. The insulation is then covered with a reinforced fibreglass mesh basecoat followed by a primer and render finish.

Why should you choose this type of insulation?

Working with market leading suppliers we can offer you a product which will keep you warm, save you money, increase your house value and give your home a brand new look. We offer a third party 25 year guarantee to give you peace of mind for the investment in your home.

Ask us about External Wall Insulation


Rendering Services

I engaged LMG to help re-render the front of my property, they arrived on time, finished the job pretty quickly and were clear and upfront about the project throughout. I would definitely recommend them.


Mr Walsh, Newport

Very happy with the external wall insulation work LMG has provided and at a reasonable price too. The boys were very friendly and hard working,reliable and the quality of the work is excellent. I was always kept in the loop. I will definitely be contacting them in the near future for work on the inside. Brilliant company!!


Mr Williams, Caerphilly

Very happy with the work done. Very clean no mess couldn’t fault this company. Recommend LMG Home Improvements to anyone.


Mr Morgan, Bargoed

After 2 weeks cooling off period, the boys were here the following week, had my house hacked off to bare brick, soffit wall ties done, weather boards replaced, facias and soffits and an acrylic honeysuckle render put on. Looks really good, very happy with the price as Carmarthen builders were much more expensive. In total it took them a whole 7 days to complete the job. My neighbours are very impressed with their work. The only downfall was that I had to keep them in bacon and egg sandwiches, coffee and biscuits. 🙂 Would definitely recommend them.


Bev Harris

Recently had some insulation render put on our 2 bed terraced house. After the 2 week cooling off period the chaps were on site & had the job done relatively quickly & for a very competitive price. We’re very happy with our Ardente colour which has set off a mini trend on our street.

I would definitely recommend LMG. We’ve got them back on site in a week to render our extension (which we couldn’t do at the same time due to works on our shed)


Christian Skallion

Want to say a massive thank you to all the guys at LMG Home Improvements! I’m extremely happy with the outcome! The guys on site have been fantastic throughout and a real credit to your company. Will happily recommend to anyone.


Mark Falkingham

LMG provided a good, reliable quotation for the works that was in line with other quotes obtained. The quality of the insulation and rendering work completed is excellent; including the detailing around windows, pipes and roof line.

Communication with LMG was excellent throughout, with regular updates at each stage of the work. The professionalism of the communication was greatly appreciated, long with helpful advice on the technical points of the insulation system.

Highly recommended.


Richard Baker, Swansea

We are very pleased with the finished rendering to the front of our house, so we are planning to have LMG do the back next year.

The workmen were very friendly, easy to talk to and listened to our requirements, telling us what would happen, why and when. We felt they had pride in their work.


Dave Fuller, Cwmbran

Very happy with the work done. Very clean and no mess. Couldn’t fault the company. Recommend LMG Home Improvements to anyone.


David Morgan, Bargoed

Look at the transformation of these properties!

Move the slider from left to right to see before and after photos.

External Wall Insulation Glannant Road BeforeExternal Wall Insulation Glannant Road After

A tired, poorly insulated stone wall given a Johnstone’s Stormshield Exterior Wall Insulation system, with a silicone render.

EWI Dyffryn Street BeforeEWI Dyffryn Street After

A mid terraced property benefitting from an External Wall Insulation to the exposed face of poorly insulated brick.

Llwyn Onn BeforeLlwyn Onn After

Johnstone’s Stormshield Wall Insulation system, with a silicone render.

EWI Mid ProcessAfter External Wall Insulation

The insulation stage of our exterior system and the finished article.

Pentrefelin Street Before RenderingPentrefelin Street After Rendering

Johnstone’s Stormshield Render, guttering and masonry paint on this tired property.