Roof Rafters 7 Insultaion

The roof will typically be insulated above the rafter line creating what is most commonly known as a warm roof.

Roof rafters 7 insultaion.

In part 7 you ll learn how to insulate the attic rafters. Working on your knees in an attic for long periods of time can be very hot and tiring. If 180mm is to be installed then 100mm board might be introduced between the rafters there has to be a minimum 25mm air gap between the insulation and the underside of the tiles or slates with an 80mm board running. For instance if the roof has 2 by 6 rafters and you want r 30 insulation which is standard in many communities you can add a 2 by 4 which will give you an 9 inch rafter space.

This roof type will require a breathable membrane like kingspan nilvent to be. Kingspan with a warm roof the usual process is to split the insulation into two layers. Insulating a pitched roof between and below the rafters is a very common roof insulation choice particularly for retrofit and refurbishment projects. The insulation is placed over the rafters and then a felt is placed on top.

It allows insulation to be installed in a watertight roof either after the roof covering has been fixed on a new build or without disturbing an otherwise sound existing roof covering as part of a renovation. You will be covered from head to toe in clothing and gear. In part 6 of this series on attic insulation we dealt with proper attic ventilation and how it goes hand in hand with proper insulation. To create a warm pitched roof insulation such as kingspan kooltherm k7 pitched roof board should be fitted between and over the rafters.

There will also be kooltherm k7 pitched roof board between the rafters image credit. The thickness of insulation will vary depending on the manufacturer s specification. The insulation can be placed between the rafters or it can be placed between the ceiling joists. As this requires fitting insulation above the rafters the roof covering will have to be removed in order to fit the insulation.

By installing high density 8 inch fiberglass batt insulation the rafters will then meet an r 30 roof insulation standard. Utilising a pitched roof as a usable living space is an effective way to maximise the square meterage of a residential development. If you have an easy roof to vent and decide to go that route you could use mineral wool insulation between the rafters and beneath the vent channels. If you choose or need to go with an unvented roof you would need either exterior insulation or a flash coat of closed cell spray foam first then you could round out the insulation package with mineral wool.