The thickness of the attic insulation depends on the value of heat transfer coefficient u.
Usable space attic insulation thickness.
If you plan to adapt a space for housing purposes in the future all you need to do is make additional insulation on the roofs.
Its value is currently 0 18 w m 2 k therefore the thickness of the open cell pur foam layer e g.
In the case of a usable attic roof areas should be insulated.
Homeowners availing of the attic or rafter insulation grants under the seai better energy homes programme are required to install insulation achieving the minimum required u values of 0 16 w m 2k for ceiling level insulation or 0 20 w mk for rafter insulation.
For those who dream of a closet to rival carrie bradshaw s this space can also make the perfect walk in wardrobe with proper insulation ventilation and custom made cabinetry of course.
Standard joist spacing for the installation of attic flooring materials is 16 inches on center oc meaning the distance from the center of one joist to the center of the next joist is 16 inches.
On the off chance that you anticipate a more elevated level of insulation you can apply a thicker layer of up to 24 cm.
Purios e which should be covered with attic is at least 21 cm.
Insulation of an attic ceiling is a suitable solution as well.