White & graphite EPS
A common domestic option with a practical balance of insulation value, thickness and cost.
Complete EWI systems for existing homes
EPS, mineral wool, XPS, phenolic and wood-fibre insulation, specified to suit the property and finished with a compatible render system.
Choosing the insulation
Different walls need different materials
The insulation board is only one part of the system. The right choice depends on the existing wall, required thickness, exposure, detailing around openings and the finish you want. We do not use the same specification on every house.
- Wall construction and condition assessed before specification
- Thickness and reveal depth considered together
- Plinths, sills, roof lines and external pipework included in the discussion
- Compatible adhesive, fixings, reinforcement, primer and finish
Insulation options
Insulation options for your home
The choice depends on the wall, the space available around windows and doors, and the requirements of the complete system.
Mineral wool
A vapour-open, non-combustible option for systems where those characteristics are required.
XPS
Used around plinths and other areas where resistance to moisture and impact is important.
Phenolic boards
Products such as Kingspan K5 can reduce the required thickness where space around details is limited.
Wood fibre
A suitable option for certain breathable wall constructions and compatible render systems.
A complete build-up
Every layer has to work with the next one.
System build-up
What happens before the final render
Prepare the wall
Loose material is removed and repairs, protection and starter details are agreed.
Fit and fix the insulation
Boards are bonded, mechanically fixed and kept tight with staggered joints.
Reinforce the surface
Beads, stress patches, mesh and basecoat form the reinforced layer.
Prime and finish
The specified primer and render complete the system once the background is ready.
Around windows, doors and roof lines
Openings, plinths and junctions matter
We assess these junctions before fitting the insulation so that the new finish works with the rest of the building.
Planning EWI?
Send the elevations and postcode
Clear photographs help us discuss likely insulation options, access and the details that may affect the build-up.