Three ways to deal with your roof profile during EWI

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verge trim

Three ways to deal with your roof profile during EWI

If you don’t have an overhang at the roofline for your insulation to tuck under, there are 3 ways to finish the profile to create a waterproof finish.

Each one has its positives and negatives, so we want to take you through the options and give you the choice.

Option 1 – Extending the roofline

For a roof where the tiles do not extend out far enough, the best option will always be to extend the roofline. This is done by adding timber batons and laying another line of tiles. This will increase the width of the roofline and allow the insulation to tuck in under the tiles. A perfect finish every time!


  • Excellent water tight finish that should never fail.
  • Aesthetically most pleasing finish


  • This is the most expensive option.
  • Matching your tiles can be difficult.

Option 2 – Verge Trim

Verge trim is a metal or uPVC material which fits along the top of the insulation, with a lip sitting up against the wall to prevent moisture going down the back of the insulation. Unfortunately, the top usually has to be sealed with a silicone sealant, which is always going to be vulnerable to water penetration.


This is a cheap and easy way to finish the insulation at the roofline however, and many installers will revert to this option. We recommend using a quality sealant that will bond with the brick and the metal trim if you go for this option.



  • Cheapest way to finish the insulation


  • Water ingress is always a worry
  • Less impressive than a roof extension finish


Option 3 – Bevelling the insulation

This is a particularly ingenious and inexpensive way to finish the roofline. As the insulation approaches the top of the wall, the insulation is chamfered so that the insulation meets the wall at an angle. The bare wall and insulation are covered by a base coat and mesh, which ensures the top of the insulation will not allow any water to ingress. This leaves a seamless finish, although aesthetically it may not look as good as other options.


  • Good seal minimising risk of water ingress
  • Relatively inexpensive finish.


  • Bevelled area can become dirty and stained over time as water runs off it.
  • Aesthetically not as pleasing although practical.



We have teamed up with EWI Pro to help provide homeowners with an approved and recommended installer network across the UK. EWI Pro are one of the UK’s leading render manufacturers and our experiences with them have always been extremely positive. They have excellent technical support and a vast array of quality products. Their list of approved and recommended installers are specialists, so by choosing one of them to complete your project, you can be assured that the work and the materials installed on your property will be to the highest standard.

If you are looking for an approved or recommended EWI Pro installer, please send an inquiry by filling in your details on the form provided!.

    Unsure of what materials you require?

    Use our EWI solid wall insulation materials calculator to calculate exactly what materials you will need for a particular job.

    EWI Pro Training Academy

    We are delighted to announce we have partnered with the EWI Pro Training Academy in Aylesbury to bring you a series of professional installer training courses.

    We have 6 unique courses to choose from, each targeting a different area of the External Wall Insulation installation process.The training courses are completed over the course of a half-day or full day, and installers will receive an EWI Pro certificate upon completion.

    Why this programme?

    The EWI Pro Training courses are designed with an all-round approach to learning. You will be given the chance to learn about installing EWI systems through a mixture of classroom and practical, hands-on training.

    This programme also allows you to learn from experienced EWI professionals with years of industry experience. This way, you will leave the course equipped with the most relevant skills.

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