How Much Insulation Do I Need In My Roof

Unvented hot roof design cathedral ceilings are also an option.

How much insulation do i need in my roof.

As with any type of insulation you need to make sure that the roof is dry and in good condition before any insulation is added. We do not recommend that you do this. Install insulation under the roofing material to reduce radiant heat gain. These minimum insulation levels are higher if your roof has an upper surface absorbance value of more than 0 4.

It lasts for more than 40 years and should pay for itself many times over in energy bill savings as the cost of loft insulation is comparatively low. Your attic should have a certain amount of insulation in it and the recommended level of insulation for your attic is dependent on where you live. So fitting insulation in your loft attic or roof space is a great way to improve your home s cosiness factor. A total value of r 13 is recommended in southern climates and r 30 is recommended in northern ones.

And there s even more good news. Inspecting your attic insulation. If you do have existing roof insulation the first thing to do is to check the depth if there is only 25mm of insulating material then this is likely to date back to the 1970s as this type of. The hot roof design allows more insulation to be installed in the roof cavity as the need for a vent space is eliminated.

Also your building codes may dictate how many and which kind of vents you need to use. First things first you need to go up into your attic inspect the condition of the insulation and calculate the current level of insulation. They can explain local codes and how many vents they intend to install on your roof. Roofs and ceilings work in conjunction when it comes to insulation.

Use our free insulation calculators to find out how much insulation material you need. Floors don t need as much insulation as attics. For example cathedral ceilings built with 2x12 rafters have space for standard 10 inch batts r 30 and ventilation. For a warm loft you install insulation directly under the roof in the plane of the roof s pitch slope.

If you re concerned about your building s insulation the best thing to do is talk to your roofer. All you need to do is input the size of your loft or roof space. You can usually get this by gluing or fastening rigid foam sheets to the joists underneath the floor and filling gaps with spray foam from a can.