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Is it better to insulate above or below concrete slab?

3. Add Your Insulation. While it is possible to insulate after pouring your concrete (above the concrete) we recommend insulating below the concrete layer. This allows the concrete slabs to actually absorb the heat too, which makes overheating unlikely and is our preferred method of concrete insulation.

longley.uk.com - How to Lay a Concrete Floor with Insulation

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At the start of a project or extension, it’s important to think about limiting heat loss in your home with properly insulated flooring. Here we give our 4 easy-to-follow steps on exactly how to insulate a concrete floor. But keep these things in mind before you start: Laying a concrete floor is a labour-intensive task that requires a few people to help with

Check that your building regulations allow you to make these changes

1. Ensure Your Floor is Level

Having your floors on a slope means that the insulation boards, once installed, are likely to be uneven and move around. This will result in a loss of insulation. Use screed and building sand to level off the area to be as flat as possible. You can use a laser level to check the correct levelling is achieved.

2. Lay Your Damp-Proof Membrane

Once the floors are levelled properly, you can lay the damn-proof membrane (DPM) over your sand layer to ensure the insulation isn’t punctured by the concrete stones. It might be easier to apply an entire sheet to your area, but if it isn’t possible, make sure the DPM edges overlap by about 150mm. This will make sure no moisture seeps into the concrete. While it is possible to insulate after pouring your concrete (above the concrete) we recommend insulating below the concrete layer. This allows the concrete slabs to actually absorb the heat too, which makes overheating unlikely and is our preferred method of concrete insulation. The most common insulation sheets are 4 metre sheets. If you can’t cover the whole area with one sheet, you can lay more but make sure you fill any gaps with foam and tape the sheets down to avoid moisture seeping into the concrete.

4. Concreting

There are several options for concreting your surface. Though it can be a lot of work, if you have a small surface area it is possible for you to barrow it in manually. The most straightforward solution is getting ready-mixed concrete pumped directly into the flooring. 100-130mm is the recommended amount, and once it’s laid you should wait 3-4 days for the concrete to adjust to the temperature and moisture of the room. For structures like a garage, you’ll need to reinforce your concrete. Rods, bars or mesh are recommended for this. Once your concrete has settled, it’s time to lay your flooring of choice (tiles, floorboards etc.) with the peace of mind that your room will be properly insulated! Longley Concrete are experts in concrete floor insulation. If your job is bigger than just a “DIY” project, then get in touch and our experts will be on hand to help spec out and get the perfect fitted insulation for your project.

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How do I stop cold air coming through my floor?

The best solution is to insulate underneath your floor with a Polyester Underfloor Insulation and/or fill any cracks or gaps with UltraClear. This is where and how to start: Find out if you have gaps between your floorboards. Look for gaps between your skirting board and your floorboards.

ecomaster.com.au - My wooden floors are so COLD. How can I stop cold air coming through ...

But wooden floorboards can let a lot of air leak through and significantly decrease the thermal comfort factor in your home. During long wet, cold and / or high humidity periods, mould, mildew and moisture can enter your home making it unhealthy for family members. The space underneath your floor can stay wet for a long time when there has been a lot of rain. The air can become stagnant allowing toxins into your home. This can potentially create an unhealthy internal environment in your home.

Where do I start to stop the cold air coming in through my wooden floorboards?

The best solution is to insulate underneath your floor with a Polyester Underfloor Insulation and/or fill any cracks or gaps with UltraClear.

This is where and how to start:

Find out if you have gaps between your floorboards. Look for gaps between your skirting board and your floorboards. Assess the crawl space underneath your house. Assess the structural condition of the floor framework and the stumps or piers that hold up the beams of your home. Houses move, wood shrinks and expands with climate conditions, foundations deteriorate with age and weather, and termites can take up residence and eat the wood away. If you have severe gaps and cracks throughout your home, then have an expert inspect your underfloor in case you have a serious structural problem. If, however, you have located gaps and cracks in your floorboards, (as shown and described in our video) the very first thing to do is to fill those gaps and cracks. Maurice Beinat, Technical Director of ecoMaster, explains how to locate gaps and how to fill them in this video.

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