How Much Insulation Do I Need In My Pitched Roof

Only where a breather membrane is being used on its own without any other form of sarking or boarding over the rafters do you not need to ventilate.

How much insulation do i need in my pitched roof.

Improve your home insulation with our high quality insulation products. Hitting amazing levels of 0 13w m will need 300mm of mineral wool or 180mm of rigid foam. Can i insulate both flat and pitched roofs. Input length and width of area to be insulated.

Flat roof there are three options available. Warm deck cold deck or inverted roof. The simplest and cheapest roof insulation is the classic cold. What depth of roof insulation should i install.

Do not use a hammer and nails to fix the battens the vibrations through the roof may cause damage to the roof covering especially where the roof is old either use screwdriver and screws or a nail gun. The recommended depth of blanket style insulation glass or mineral wool for a loft is 250 to 270 mm. Yes both types of roof can be insulated. Call us today visit our online store or contact us for assistance by email.

Warm or cold loft insulation. A pitched roof is any roof that rises 4 inches or more per 12 inches. Depending on the specifics of the roof it may be possible to fully fill the rafter depth or in most cases leave a 25mm or 50mm air gap between the top face of the insulation and the sarking membrane. Once the battens are in place cut the insulation board to be a tight fit between the rafters and push it into the gap.

If it is a pitched roof or if you plan to build a room above the garage with a pitched roof in the future the requirements will be different than if you are dealing with a flat roof with less than 10 degrees of pitch. The type of insulation you should choose will depend on the type of roof you have. For a pitched roof where a breather membrane is not being used correctly it is always a requirement to have a 50mm ventilated airspace above any insulation between the rafters. Cold loft insulation for pitched roofs.

Achieving a u value of 0 20w m meaning your roof will be better insulated than your walls will need 120mm thickness of rigid foam or 200mm of mineral wool or natural insulation. Before doing anything else take into consideration the type of roof your garage has and plan out your insulation accordingly. A flat or low slope roof rises from 1 inch to 3 inches per 12 inches. This calculator is to be used as an estimating tool only.