To help provide you with more information we’ve compiled this handy list of answers to common questions. Feel free to contact us if you require further details.
We have a very cost effective solution. We can insulate between the floor joists and keep the ventilation below. Our method only needs a few floorboards to be lifted. This makes the process quick and minimises disruption – we can often complete a room in one day. What’s more, because the insulation is blown in, it tightly fills the space between the joists to eliminate cold draughts more effectively than alternatives. For more information and to find out how we could insulate your suspended floor, please contact us.
The risk of damage from condensation is too high for us to consider using an organic material between two masonry walls. It is possible for damp to collect in cavities on the inner face of the brickwork. Although cellulose can safely take up and lose high humidity levels, it should not get soaking wet and so needs to be separated by a gap. This makes it ideal for timberframe walls, which have a space between the external weatherproof layer and the frame, but in appropriate for cavity walls which would lose their gap when insulated.
Possibly. Though access to the roof void and the risk of potential problems with condensation make this less likely than with pitched roofs. Materials used for roofs have evolved over recent years and the chances of being able to fill the void are much better with a modern roof, or one that has been reroofed.
The main issue is whether the roof needs ventilation or not. If it has a layer of insulating material above the timbers, it probably will be OK to fill. Moisture is produced inside buildings by general use, and this can be absorbed by ceiling materials and pass through as vapour into the void behind. If the roof is not insulated above the roof timbers, the moisture can condense on the underside of the roof decking. This is not a problem if the void is ventilated and the moisture can be dispersed over time. However, it means we cannot fill the void if it would block the ventilation.
The best way to answer the question is to contact us with as much detail as you can about all the materials in the roof construction, if possible with measurements of each layer. We can analyse the risk of condensation, and calculate the heat benefits of adding insulation. Call us to discuss what information we would need.
Until recently, builders have not had to try very hard to prevent air/heat leaking through hundreds of tiny gaps in the structure. Now, all new buildings have an airtightness test – an independent tester will fit a fan onto the front door and try to suck the air out of the building. How easy it is to do that is recorded and compared to a target result for each building. Often buildings will fail the test, and that means potentially huge problems trying to find and stop leaks after the building has been finished. Our system of blowing cellulose insulation to tightly fill spaces contributes to airtightness, leading to significantly better test results compared to other insulations.
Cellulose fibre insulation is used as a fire retardant material, so your risk of fire damage actually declines if you use cellulose fibre. Studies have been carried out which show it is one of the best insulations to have if you are unlucky enough to have a fire. See Fire Resistance for more info.
Cellulose fibre can be installed as a DIY insulation, and consumer grade material is available in bags which are less compacted so that it is easier to ‘fluff up’ by hand. However, even at the minimum thickness for regulations, this can take quite a long time. Using our system to blow it in is very quick. Other situations, such as walls and closed-in roofs, should be installed by a BBA accredited installer, using the system to achieve a good fill at a good density.
Two things – it’s very,very quick, and it pumps the insulation into spaces so that they are really well filled at just the right density to work at the optimum performance.
There are many types of insulation available. Fibre insulations include cellulose, fibreglass, rockwool, sheepswool, hemp, and others. Petrochemical insulations include polystyrene and PIR foam. Thin multi-layer insulations can occasionally be used in certain situations.
Comparing fibre insulations, the figures used for thermal conductivity of each are quite similar in heatloss calculations to produce U-values. However, in practice, studies have shown that the cellulose system outperforms the others when measuring heat required to get up to temperature and heat retained over time. Only PIR foams can do better in U-value calculations, but have very little thermal mass to retain the heat. Environmentally, PIR foam production is the worst for carbon emissions, whereas cellulose is the best, being actually carbon-negative. More information on the thermal performance of cellulose insulation can be found here.