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Thermal Plasterboard

Combined insulation and dry-lining for solid walls.

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Insulate & Renovate in Suffolk, Norfolk & Essex

Thermal plasterboard (often called insulated plasterboard) is a sheet of plasterboard with a backing of high-performance rigid foam insulation (PIR). It allows us to insulate and re-plaster a room in a single operation.

This is the standard method for Internal Wall Insulation (IWI). It is perfect for renovating older properties with uneven or damp walls, as it provides a perfectly flat, warm surface ready for decoration.

Vapour Control

Crucially, thermal plasterboards contain an integral Vapour Control Layer (VCL). This stops moisture from inside the room passing through the board and condensing on the cold brick wall behind, preventing "interstitial condensation".

Combined gypsum face and PIR foam backing

Installation Process in Suffolk, Norfolk & Essex

1. Preparation

We remove skirting boards, radiators, and sockets. Existing plaster may be removed if it is loose ("blown"). We treat any underlying damp issues first.

2. Fixing

Boards are fixed mechanically (screwed to batten) or using adhesive dabs ("dot and dab"), depending on the wall condition. All joints are taped and sealed.

3. Finish

We skim the entire surface with a multi-finish plaster to create a glass-smooth finish. We then reinstate skirtings and electrics (which may need extending).

Thermal plasterboard installed on an internal wall around a window

Thermal plasterboard fitted to an internal wall

Installer fitting thermal insulation board to an internal wall

Professional installation of insulated dry lining

Celotex insulated plasterboard panels showing insulation core

High-performance insulated plasterboard panels

Full Service in Suffolk, Norfolk & Essex

We handle the plastering, carpentry, and electrics.

Experienced Plasterers
Kingspan / Celotex Boards
Building Regs Compliant

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Thermal Boarding

Thermal Plasterboard Questions

What should be assessed before fixing insulated plasterboard to a wall?

First establish whether the wall is dry and sound, how it is built, and whether there are signs of leaks, salts or recurring damp. The chosen lining affects room dimensions, window reveals, sockets and the way moisture moves through the wall. Covering a damp area can conceal an unresolved cause, so investigate visible moisture before installing a new finish. Learn about damp inspections if the source is unclear.

Read about damp inspections →