The benefits
Underfloor insulation is another measure through which homeowners can make their home more energy efficient and help reduce energy bill.
Houses with suspended timber ground floors can be insulated by laying mineral wool insulation supported by netting between the floor joints. Cellar or basements underground floors can often be insulated from beneath as this will save having to lift the floorboards.
Homes with solid concrete floors can also benefit from insulation. This needs sheets of rigid insulation to be laid over the top of the concrete and then a layer of chipboard put on top of that.
Newer homes tend to have solid concrete floors, and these can also benefit from insulation. A solid concrete floor will require sheets of rigid insulation to be laid over the top of the concrete and then a layer of chipboard put on top of that. Unless you are a very experienced DIYer this job is best undertaken by a professional as doors, skirting boards and even electrical sockets may need adjusting to compensate for the new increased floor height.
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Underfloor insulation can be installed in houses that have suspended floors or a cavity underneath. Older homes (pre-1970s) are most likely to have suspended timber floors. If you have air bricks or ventilation bricks on the outside wall(s) of your house that is below floor level, you probably have a suspended timber floor.
Our surveyors would be able to check suitability at the survey.
Floor insulation can also be installed on solid floors such as concrete but this is a much bigger job and you will need to build on top of the existing floor.
Timber floors can be insulated by entering the crawl space via an existing hatch or creating a new one and laying mineral wool insulation supported by netting between the floor joists.
You should consider insulating any floors that are above unheated spaces.
A typical suspended floor installation could cost you between £1,300 and £2,700 depending on the circumstances. Solid floor insulation could cost considerably more
All installations are carried out by Construction Circle’s experienced technicians using only SWIP products approved by BBA.
All our installations are registered with Trust Mark
FAQs
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Why Add Underfloor Insulation?
- Because suspended timber floors are draughty! Most suspended timber floors comprise simply of floor boards laid on top of timber floor joists. These draughts are often reduced slightly by liners laid below timber or laminate floor finishes, but these will not stop the draughts completely as the edges are not typically taped to make them airtight.
- Well installed underfloor insulation will mean your house will heat up quicker and loose heat slower – provided the underfloor insulation is correctly installed.
- Correctly installed hygroscopic insulation in an older property’s suspended timber floor will absorb some of the water vapour within the property during periods of high humidity (reducing the risk of condensation and mould on interior surfaces such as walls and ceilings) and release this water vapour slowly when the humidity levels are low.
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How do we Traditionally Add Insulation to Suspended Timber Floors?
The easiest way is to simply lift the floor boards and install the insulation between the floor joists (after you have fully checked them for damp and rot and carried out any necessary repairs). Then relay the floor boards and finish with your chosen floor finish.
Sounds simple, right? Wrong!
As with any form of insulation in your home, it’ll only work effectively if you use the correct type of insulation, protect it from moisture, wind washing (where the air movement via the sub-floor vents draws warmth out of the exposed insulation) and by making sure the installation is as airtight as possible.
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How long does it take to install?
Depending on the size of your property, on average our installers would complete the installation within one day.