How Deep Should Roof Insulation Be

Warm loft insulation is used on pitched roofs where you are using the loft space as a room or for storage.

How deep should roof insulation be.

What depth of roof insulation should i install. A poorly insulated attic lets heat escape through the roof wasting energy used to warm. The recommended depth of blanket style insulation glass or mineral wool for a loft is 250 to 270 mm. Blowing insulation into walls is best left to the pros because it involves drilling into stud spaces that may contain electrical.

First things first you need to go up into your attic inspect the condition of the insulation and calculate the current level of insulation. The table below shows what levels of insulation are cost effective for different climates and locations in the home. Mark the desired level on different roof trusses around the attic before you start photo 4. The insulation is installed under the roof in the slope.

This is best done when the roof covering needs replacing anyway. If you have a wall ceiling roof construction whereby you need to insulate the ceiling up to the roof membrane then you have to install rafter vents to allow air to continue to flow. Insulation level are specified by r value. Handy homeowners can install blown in insulation in the attic.

If you re scratching your head r values are the ratings used to quantify the thermal resistance insulating qualities of each material. When you re blowing insulation it can get dusty and hard to see whether you ve got it deep enough around the entire attic. You should leave the space under the roof tiles free from insulation to give adequate ventilation so that you don t get condensation or water coming through the tiles. Inspecting your attic insulation.

How deep to put blown in insulation. Pick up the blower and insulation. The higher the r value the better the thermal performance of the insulation. R value is a measure of insulation s ability to resist heat traveling through it.

The key factor that helps to understand the answer to the how deep should my attic insulation be question is getting your head round the r value of the different types of insulation. A flat roof should preferably be insulated from above. Cellulose blown in ceiling insulation is a good choice for diyers. We have seen this many times as free insulation is being fitted by untrained unskilled fitters.