Floor Insulation

With the latest changes in regulations, the requirement is to achieve a U value of 0.20. This translates to a rigid board insulation of 80mm plus. The boards used for this work are the Celotex GA400 range or the Kingspan TF70 range.

Insulating the floor is usually achieved in one of two ways. Either you screed over the top of your insulation boards or you can lay insulation over the final screed and under your finished floor. When installed correctly and with a hard surface on top of them, the insulation boards can support a large amount of weight.


Installation

Screeding Over Boards


Ensure the boards are laid above the damp proof membrane. The boards must be laid on a flat surface free from projections and continually supported. The boards should be laid with butted, staggered joints. A polythene sheet should be laid over the entire surface to prevent screed getting into the joints or use the tape that we sell. A 20 mm insulation should be inserted vertically around the perimeter of the floor. This should be screeded over with a sand screed cement of 65mm.

Your board choice here is a little complicated by whether you are intending to integrate under floor heating. Celotex for example do a proprietary board especially aimed at under floor heating known as their FF4000 range. Many people will use regular GA4000 boards for this application. For best value you are best to stick to regular PIR foam type boards.

The phenolic range as offered by Kingspan, Kingspan K3 is in the region of about 7-10% more efficient than the PIR boards however the benefits probably don't warrant the much higher cost. All the rigid boards have good compressive strength qualities so you may choose to lay insulation over the floor slab and lay a tongue and grooved floor directly over the top of that. Typically the same thickness of insulation is required whether you go under the slab or over it.


Insulating A Suspended Timber Floor?

The void below an insulated suspended timber floor must be well ventilated. The insulation must be cut to fit tightly between the joists to prevent heat loss.

Kingspan TP10, TF70 and TW55 PIR Boards

Kingspan TP10, TW55 and TF70 (all the same board) are high-performance, rigid PIR panels with a thermal conductivity of 0.022 W/mK. They are an ideal home insulation product for use as wall insulation, floor insulation, and in pitched rooves and ceilings, and are the equivalent of Celotex's GA4000 range.

Product Name Size Unit Price Qty. Sub Total
 Kingspan 25mm TP10 TW55 TF70
2400mm x 1200mm £17.68 £0.00
 Kingspan 30mm TP10 TW55 TF70
2400mm x 1200mm £31.02 £0.00
 Kingspan 40mm TP10 TW55 TF70
2400mm x 1200mm £23.06 £0.00
 Kingspan 50mm TP10 TW55 TF70
2400mm x 1200mm £28.52 £0.00
 Kingspan 60mm TP10 TW55 TF70
2400mm x 1200mm £34.66 £0.00
 Kingspan 70mm TP10 TW55 TF70
2400mm x 1200mm £41.47 £0.00
 Kingspan 75mm TP10 TW55 TF70
2400mm x 1200mm £46.00 £0.00
 Kingspan 80mm TP10 TW55 TF70
2400mm x 1200mm £47.86 £0.00
 Kingspan 90mm TP10 TW55 TF70
2400mm x 1200mm £51.58 £0.00
 Kingspan 100mm TP10 TW55 TF70
2400mm x 1200mm £60.31 £0.00
 Kingspan 120mm TP10 TW55 TF70
2400mm x 1200mm £72.30 £0.00
 Kingspan 150mm TP10 TW55 TF70
2400mm x 1200mm £122.25 £0.00
  £0.00
 

Celotex GA4000 PIR Boards

Celotex GA4000 range (previously GA3000) is a multi-purpose PIR insulation board, and is the equivalent of Kingspan's TP10/TF70/TW55 range. It is ideal for floors, walls, pitched rooves and ceilings. It has a thermal conductivity of 0.022 W/mK.

Product Name Size Unit Price Qty. Sub Total
 Celotex 12mm Foil Backed PIR Boards TB4012 (No Longer Available)
2400mm x 1200mm £0.00 £0.00
 Celotex 25mm Foil Backed PIR Boards TB4025
2400mm x 1200mm £17.39 £0.00
 Celotex 30mm Foil Backed PIR Boards TB4030
2400mm x 1200mm £22.85 £0.00
 Celotex 40mm Foil Backed PIR Boards TB4040
2400mm x 1200mm £26.54 £0.00
 Celotex 50mm Foil Backed PIR Boards GA4050
2400mm x 1200mm £25.27 £0.00
 Celotex 60mm Foil Backed PIR Boards GA4060
2400mm x 1200mm £38.58 £0.00
 Celotex 70mm Foil Backed PIR Boards GA4070
2400mm x 1200mm £44.80 £0.00
 Celotex 75mm Foil Backed PIR Boards GA4075
2400mm x 1200mm £38.45 £0.00
 Celotex 80mm Foil Backed PIR Boards GA4080
2400mm x 1200mm £50.93 £0.00
 Celotex 90mm Foil Backed PIR Boards GA4090
2400mm x 1200mm £56.31 £0.00
 Celotex 100mm Foil Backed PIR Boards GA4100
2400mm x 1200mm £47.48 £0.00
 Celotex 120mm Foil Backed PIR Boards XR4120
2400mm x 1200mm £56.00 £0.00
 Celotex 130mm Foil Backed PIR Boards XR4130
2400mm x 1200mm £72.85 £0.00
 Celotex 140mm Foil Backed PIR Boards XR4140
2400mm x 1200mm £64.94 £0.00
 Celotex 150mm Foil Backed PIR Boards XR4150
2400mm x 1200mm £68.39 £0.00
  £0.00
 

Kingspan Kooltherm K103 Floor Boards

Kooltherm K103 Floorboard is a premium performance floor insulation that provides a thermal conductivity of just 0.018 W/mK across all thicknesses.
Product Name Size Unit Price Qty. Sub Total
 Kingspan K103 25mm price per board (normally available in packs of 12 only)
2400mm x 1200mm £27.75 £0.00
 Kingspan K103 50mm price per board (normally available in packs of 6 only)
2400mm x 1200mm £42.97 £0.00
Kingspan K103 75mm price per board (normally available in packs of 4 only)
2400mm x 1200mm £63.47 £0.00
Kingspan K103 100mm price per board (normally available in packs of 3 only)
2400mm x 1200mm £82.78 £0.00
  £0.00
 


Product Name Size Unit Price Qty. Sub Total
  £0.00
 
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