Roof Blow Insulation Topping

And the cost of getting in a professional company to vacuum out the roof space will often exceed the cost of installing new insulation.

Roof blow insulation topping.

Spray foam roof insulation. On top of this the boards will provide insulation to bring the combined total to the equivalent depth of 270mm. If there s very little existing insulation we recommend a 100mm base layer and a 170mm top layer. When installing your batts make sure to fit them tightly end to end as gaps in the insulation can greatly reduce your r value.

This is best done when the roof covering needs replacing anyway. If using a top layer of insulated loft floor boards aim for a base layer of loft roll as close as possible to 100mm. When you install insulation in an existing closed wall or in an attic it likely will be a loose fill product called blow in cellulose insulation with an attic this type of insulation is just one option along with the other popular alternatives fiberglass batts or blown in fiberglass. Also make sure that any electrical cords and cables in the roof are sitting on top of the insulation and not under it.

They will use specialist equipment to blow loose fire retardant insulation material such as cellulose fibre mineral rock wool cork granules or even recycled newspaper into the loft. For an uninsulated attic it s important to install a vapour barrier on the interior side of your roof before filling it with insulation. The insulation is a big improvement but probably what happened was that the initial moisture i had in there was being caused by warm air coming into the attic from the kitchen and bathroom upstairs and because the soffit vents were not ventilating properly this caused a temperature differential in the attic which caused the condensation. Useful for topping up existing insulation in.

A layer of rigid insulation board can be added either on top of the roof s weatherproof layer or directly on top of the timber roof surface with a new weatherproof layer on top of the insulation. Loose fill insulation works well in inaccessible spaces and for topping up. Blow in insulation wool insulation paper insulation and most other types of bulk insulation will settle and compress over time. If your house currently has a properly installed and quality insulation in the ceiling but it requires a higher r value then topping up with an additional layer of thermal insulation may be a viable alternative.

If you need to install around downlights cut a semi circle out of two ends of the insulation and butt them together leaving a 200mm gap either side of the light. Make sure you put all your weight on the joists as you work. It s more difficult to get a neat finish when topping up old. Make sure you don t block any ventilation areas.