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Floor Insulation

Floor Insulation

INSULATING FLOORS

FLOOR INSULATION

WHAT INSULATION DO I NEED ?


INTRODUCTION

When it comes to insulating floors, it can be tricky to know what kind of insulation you need, especially if you are tackling a renovation project.

Insulating floors is often trickier than insulating other areas of your home. The ground floor beneath a house is generally warmer than the air around it, and so it would perhaps be third on your list of priorities (behind walls and roofs). However, it makes sense to consider retrofitting, particularly if you have a suspended timber floor.

 

You can retrofit floor insulation on top of a solid concrete base, too, but this will have an impact on floor height build-up. And it’s only worth digging out the floor if you’re undertaking a major renovation.

 

The Importance of Insulating Floors

The limiting U value (the maximum U value that cannot be exceeded) required under current Building Regulations are:

  • Roof: 0.20W/m²
  • Ground floor: 0.25W/m²
  • Walls: 0.30W/m²

 

INSULATING A SOLID FLOOR

Most modern homes have a solid floor, for example:

  • concrete slab
  • concrete planks
  • block and beam

Insulation is laid on the concrete and covered with a screed. There will be a damp-proof membrane under the insulation and possibly a second membrane on top, depending on the type of screed.

In this scenario, a rigid foam insulation is usual, and as you’d want the same U value in the roof, we need the same thickness of insulation (180mm). Many builders will baulk at this figure — it was not long ago that installing 50mm of insulation in the floor was considered fairly advanced.

INSULATING A SUSPENDED FLOOR

A suspended timber floor tends to be cold and draughty because of the air circulating beneath it. Installing any amount of insulation will warm the floorboards and go a long way towards eliminating draughts. The effect is a greater sense of comfort and that, in turn, allows the homeowner to turn the thermostat down.

Achieving a U value of 0.25 would be a good target. That would need 90mm of rigid foam or 150mm mineral wool. A semi-rigid material is generally best as it can be cut very slightly oversized and squeezed in between the floor joists, thereby ensuring no draught-causing gaps.

Floor Insulation

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100mm Celotex GA4000 PIR insulation for floors-walls-roofs

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£49.32 EX
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£59.18 INC VAT

100mm Celotex GA4000 PIR insulation for floors-walls-roofs 100mm Celotex GA4000 PIR insulation for floors-walls-roofs is a general purpose insulation board for floors, walls and roofs. It has long been at the heart of the Celotex product range providing the user with a range of thermal insulation solutions. With low emissivity foil facings, GA..

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100mm FLOORMATE 300-A Styrofoam - Extruded Polystyrene Foam Insulation Board (Pack-4)

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100mm Dow FLOORMATE 300-A Styrofoam - Extruded Polystyrene Foam Insulation Board (pack-4)Dow Floormate insulation boards are manufactured using high quality extruded polystyrene used for insulating floors. This FLOORMATE 300-A board can be installed under or over the slab in ground bearing concrete floors. It is also suitable for use on suspended b..

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100mm Kay-Metzeler EPS70 Expanded Polystyrene (3/pack)

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£78.10 EX
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£93.72 INC VAT

Kay Metzeler EPS70 Expanded PolystyreneAn expanded polystyrene insulation board ideal for floor and wall insulation, Kay-Metzeler EPS70 provide a long lasting thermal solution. The polystyrene board is easy to cut to any shape making it ideal to fit to any space.Expanded Polystyrene (EPS) is proven in use over decades across the globe for const..

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100mm Kingspan Thermafloor TF70

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£82.69 EX
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£99.23 INC VAT

Kingspan Thermafloor TF70High performance floor insulation Kingspan Thermafloor TF70 is a high performance insulation with a fibre-free rigid thermoset polyisocyanurate (PIR) core.It used to insulate solid concrete and suspended timber ground floors, and has a thermal conductivity of 0.022 W/m·K.Thickness: 100mmAll thickness : 2..

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100mm Kingspan Thermapitch TP10 pitched warm roof Insulation

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100mm Knauf Earthwool Flexible Insulation Slab (pack-6)

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100mm Kingspan Thermapitch TP10 pitched warm roof Insulation100mm Kingspan Thermapitch TP10 pitched warm roof Insulation is a high performance insulation with a fibre-free rigid thermoset polyisocyanurate (PIR) core.It is suitable for tiled or slated pitched warm roof spaces, and has a thermal conductivity of 0.022 W/m·K.Thickness: 100mmSize: 2400x..

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100mm Polyfoam Floorboard Super Rigid Extruded Polystyrene Board (pack-4)

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£26.00 EX
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£31.20 INC VAT

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100mm Quinn Therm QF PIR Insulation Board - 2400mm X 1200mm

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100mm Ravatherm XPS X 200 SB Extruded Polystyrene Board For Floors And Walls (Pack-4)

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100mm Ravatherm XPS X 300 SB Multi-Purpose Extruded Polystyrene Board (Pack-4)

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£45.50 EX
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100mm Recticel Powerdeck U PIR Insulation Board For Flat Roof - pack/5Easy to install flat roof insulation board suitable for torch-on felt.100mm Recticel Powerdeck U PIR Insulation Board For Flat Roof - pack/5 is a high performance rigid PIR insulation board for use in warm flat roofs with bituminous torch-on felt waterproofing systems. Its o..

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100mm Recticel Powerdeck U PIR Insulation Board For Flat Roof - pack/5Easy to install flat roof insulation board suitable for torch-on felt.100mm Recticel Powerdeck U PIR Insulation Board For Flat Roof - pack/5 is a high performance rigid PIR insulation board for use in warm flat roofs with bituminous torch-on felt waterproofing systems. Its o..

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