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Technical guides and information about insulating traditional suspended floors

How does Retrovive underfloor insulation work?

  • Writer: Tom Collings
    Tom Collings
  • Apr 24
  • 2 min read

Updated: Apr 28

Cold air provides important ventilation under your floor but, without insulation, it sucks heat out of your home and makes your floors cold.

From Victorian times to the mid-20th century, houses in the UK were built with a space under the floor to isolate the rooms from the damp ground. This space is kept ventilated by airbricks, which means cold outside air is blowing everywhere underneath, just a floorboard-thickness beneath your feet.


This presents two problems:


  • Firstly, any warmth in your floorboards is simply lost to the cold air beneath, making your floor feel cold and impossible to heat. Carpets and rugs quickly lose their warmth to the floorboards they are in contact with.


  • Secondly, floorboards themselves do not create an airtight seal, sending chilly draughts up into the room. If you imagine adding all the gaps in your floor together it would be equivalent to having a whole floorboard missing across the room. That’s a very large, draughty hole - similar to having a window open all the time!




Retrovive insulation keeps the cold below and your house warm.

We insulate your floor by packing insulation tightly below the floorboards, preventing heat loss from the room and completely eliminating those cold draughts.


Firstly we fit a ‘breathable’ membrane below the floor joists at the right depth to hold the insulation and then we fill between the joists with our high-performance cellulose-fibre insulation. This is blown in under pressure to pack it tightly into all the corners.


We are careful to keep the ventilation airgap below the insulation, as shown below. This is still important to make sure the damp ground remains isolated from the room and timber floor as before.




Years of innovation have resulted in the best solution for retrofit underfloor insulation.

Throughout our years of experience with industry and homeowners we have developed the Retrovive system that achieves all this by lifting just a few boards. Unlike other approaches we don’t need to take up the whole floor, meaning we can often insulate a whole floor in a day - without even removing the skirting.


Plus, our blown-in insulation method leaves no gaps, unlike alternative methods where sheet or roll material is cut to an approximate fit.



Instant comfort and cost savings twice over.

Retrovive brings cost-saving benefits in two ways. Firstly, the layer of insulation holds in your heat, so you use much less energy to keep the temperature up.


Secondly, without draughts you feel comfortable at a slightly lower temperature, so you could turn the thermostat down a bit as well. So, more heat saved and lower fuel bills.


With Retrovive, you can keep the heat in! Make your home comfortable and save money as well. Find out more by speaking with our knowledgeable team today.


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