It can either be laid between the joists the horizontal beams along the floor of your attic or the rafters the angled beams that support the roof.
Loft insulation for attic bedrooms.
Insulated plasterboard is useful for this purpose.
Is great stuff an option or is there a better way to prevent air from leaking out into the attic.
Plasterboard is available with a wide variety of rigid insulation products bonded to it.
And the answer to that is if that attic is going to be a heated finished space then the insulation moves from the ceiling of the second floor up to the underside of the roof rafters.
This is just for glass mineral wool insulation the most common and popular material.
If only the living space will be insulated wrap the insulation around the room s walls and ceiling and then continue along the floor of the non living space.
Insulating a finished attic there are two basic ways to insulate a finished attic.
In england the required minimum u value for pitched roofs insulated at rafter level is 0 18 w m k whilst for flat ceilings the minimum is 0 16 w m k.
In this case the area behind the knee wall will be uncomfortably hot or cold.
When insulating a loft the most practical solution is to place most of the insulation between the rafters with a smaller additional layer fixed to the underside of the rafters.
Use the table below to work out how the depth of your existing loft insulation translates into an r value.
If the loft is not airtight moisture can also get into the roof structure and cause damage to the structural components.
What about when it comes to sealing the space in between the floor joists in the bedroom where they meet the insulation in the knee wall attic space.
That becomes the thermal barrier.
Now to do that you have to be very careful to make sure you maintain some ventilation space.
A minimum r value of 6 1 is recommended for loft floor insulation but ideally it would be up to 7 0.
Jared jul 19 12 at 12 57.
You can prevent this by.
You can t just insulate.