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Our SystemsFloor
Floor Insulation
Breathable insulated floors for old and new buildings — whether you have a solid ground floor or a suspended timber floor.
Overview
The right way to insulate a floor depends on how it is built. We supply two breathable floor systems: one for solid ground floors and one for suspended timber floors. Both are designed to manage moisture safely, which matters in older buildings where floors often have no damp proof membrane.
Solid floors: LithoGlas replaces a concrete slab and PIR insulation with a free-draining layer of recycled FG40 Foamglass aggregate, topped with wood fibre boards and Lithotherm underfloor heating tiles. There is no concrete pour and no drying time, and the floor can be finished as soon as it is laid. It suits renovations with earth or failing concrete floors, and self-builds.
Suspended timber floors: flexible wood fibre insulation is fitted between the joists, supported by a breathable membrane below and sealed with an airtight vapour control membrane above. It can be installed from above by lifting the floorboards, or from below where the void is accessible, and it cuts both heat loss and draughts.
Not sure which you have? A solid floor sounds dull and feels hard underfoot; a suspended floor usually has floorboards over joists, with air bricks in the outside walls ventilating the void below.
Benefits
- Systems for both solid and suspended timber floors
- Breathable build-ups that protect walls from moisture
- Cut heat loss and draughts at floor level
- Compatible with low-energy underfloor heating
- LithoGlas: no concrete slab and no drying time
- Suspended floors: install from above or below
Compare our systems
Each system suits different buildings, budgets and projects. Compare them side by side, then open a system for the full build-up, products and specifications.
- Insulation
- FG40 Foamglass aggregate with wood fibre boards
- Typical thickness
- Approx. 365mm plus floor finish
- Typical U-value
- From 0.25 W/m²K down to 0.17 W/m²K or lower, depending on depth of FG40.
- Best suited to
- Ground floors without a concrete slab, including renovations with earth floors and self-builds
- Insulation
- Flexible wood fibre between joists
- Typical thickness
- Fills the full joist depth
- Typical U-value
- From 0.40 W/m²K down to 0.17 W/m²K, depending on depth of joists.
- Best suited to
- Suspended timber floors, installed from above or below
LithoGlas Solid Floor System
A free-draining, solid insulated ground floor with integrated underfloor heating — built without a concrete slab. No drying time, and it can be removed after installation.
Suspended Floor Insulation
Insulate suspended timber floors with flexible wood fibre between the joists, detailed with breathable and airtight membranes so moisture and air leakage can’t cause problems.
Not sure which system is right for your project?
Tell us about your building and we'll recommend the right build-up. Call us on 01392 861763 or send us a message.