Best Loft Floor Insulation

The insulation should be pushed tight to the underside of the floorboards.

Best loft floor insulation.

Loft insulation if your property has a roof with attic space then loft insulation is the first thing you should look at particularly since an estimated 25 of the heat in your home is lost. Fiberglass rolls can be placed between joists but the fiberglass itself will need to be cut to fit properly between joists. Fiberglass insulation is usually the best option though handling fiberglass can be dangerous and it is not the most eco friendly option in some cases. The most common form of loft insulation this comes in rolls of rock glass or mineral fibre we use earthwool by knauf which is a really good environmentally friendly option or else foil backed felt.

According to the 2012 irc the minimum r value for floor assemblies is r 13 in zones 1 and 2 r 19 in zones 3 and 4 r 30 in zones 5 and 6 and r 38 in zones 7 and 9. It is the longest lasting and the highest r value insulation that can be put into place. It s generally the cheapest option and good all purpose insulation especially for between joists. Save 60 50 10.

Find your zone on the map and then use the above insulation r value chart to determine the level of insulation you need to properly insulate your attic walls floors and crawlspaces. Best seller owens corning thermafiber fire and sound guard mineral wool insulation batt 15 in. The insulation should press right up against the floor between joists. Gaps between the insulation and the floor can.

These r values are a sum meaning this should be the total r value once you add up the entire depth of insulation. A semi rigid material is generally best as it can be cut very slightly oversized and squeezed in between the floor joists thereby ensuring no draught causing gaps. Foam in place insulation is sprayed into spaces between the joists and goes around venting pipes and electrical work. The most expensive option.

Save 60 50 10 544 50 pallet 605 00. This is to prevent the joist. At least 25mm of the joist must be left exposed to ensure air circulation. View the owens corning 2x6 wall floor insulation 544 50 pallet 605 00.

If you want to insulate a floor assembly by leaving the joist bays empty and installing rigid foam on the underside of the joists here are a few things to keep in mind. You can still board directly on to the joists if you want but it is worth noting that this would not pass a building control inspection because you wouldn t have the full 270mm depth of insulation required by regulations. 4 trim lengths of paper backed insulation so they follow a joist bay from one rim joist to the one opposite.