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Building fabric

Insulation measures, specified from the survey rather than the catalogue.

Cavity wall, underfloor, room-in-roof, flat roof and internal wall insulation. Which ones make sense depends entirely on how the property is built, which is why we look before we price.

House elevation with five insulation measures labelled A to E
5 measuresCommonly specified
Survey-ledNever catalogue-led
Per measureCosted separately
VentilationReviewed with every measure

Typical measures and what they do

The figures below are typical ranges for UK housing. Your property will have its own numbers; the survey gives them.

MeasureTypical U-value afterWhere it suits
Cavity wall fill0.55 W/m²KPost-1920 cavity walls in sound condition
External wall insulation0.30 W/m²KSolid walls with room to build out
Internal wall insulation0.30 W/m²KSolid walls where the elevation must not change
Suspended floor0.25 W/m²KTimber floors with an accessible void
Room in roof0.18 W/m²KConverted lofts and dormers

Why the order matters

Measures interact. Insulating a wall changes where condensation forms in it. Draught-proofing a house changes how much ventilation it needs. Insulating the roof before the walls gives a different answer from doing it the other way round.

So we sequence them, and the survey sets out which measures to do, in what order, and which ones to leave alone. Sometimes the honest answer is that a measure is not worth it on your property.

Timber-framed houses under construction, with sheathed walls, against a clear blue sky
Where the wall build-up starts: the building envelope under construction
Scope

What this covers

  • Cavity wall insulation — survey, fill and borescope check
  • External wall insulation with render finish
  • Internal wall insulation on solid walls
  • Suspended timber floor insulation
  • Solid floor and flat roof insulation
  • Room-in-roof, dormer and sloping-ceiling insulation
  • Draught-proofing and sealing at junctions
  • Ventilation review alongside every measure
Questions

Common questions about insulation measures.

What is the difference between external and internal wall insulation?

External insulation goes on the outside and changes the elevation; internal insulation goes on the inside and takes a little floor space. Which one suits depends on the wall, the planning position and what you are doing to the room.

Is cavity wall insulation right for my house?

Only if the wall is a cavity wall in suitable condition and exposure. A survey and borescope check show whether the cavity is clear and dry enough to fill.

In what order should insulation measures be done?

Fabric first, then ventilation, then heating. Measures interact, so the survey sets the order and notes which ones to leave alone.

Related

Often needed alongside this.

Building fabric

External Wall Insulation

EPS or mineral wool board fixed to solid walls, then basecoat, mesh and finish render — the biggest single fabric gain on a solid-wall home.

View service →Building fabric

Loft Insulation

Mineral wool laid to 270 mm with eaves ventilation kept clear, plus hatch, pipe and tank insulation.

View service →Building fabric

Retrofit Works

Surveys, measure-by-measure costings and the works themselves, sequenced so fabric, ventilation and services do not fight each other.

View service →
Next step

Get this priced.

Email contact@retrofitclicks.com with the address and a short description, or use the enquiry form. Building work is surveyed before it is quoted.

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