This generally would not be a sufficient thickness to achieve the u values required to meet building regulations and more insulation would need to be added.
Insulate attic between rafters.
Common rafter depths range from 100mm to 200mm.
Install ventilation baffles into the space between the rafters before you install the insulation usually by stapling into place.
That s because it s easier for the contractor to spray than clean up existing insulation deal with any can lights or venting etc.
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If you re using the attic for living space then you need to insulate the rafters.
Push the insulation in place between the rafters but be careful not to compress the material.
2d extend insulation into joist space to reduce air flows.
Then blow another layer on top of the roof rafters.
For insulation to reach its full potential for preventing warm air migration it must maintain the.
If you re not do the attic floor.
Consumers are often told by spray foam contractors to do the rafters.
Once the insulation is in place between all the rafters staple up a vapor barrier of 6 ml.
Typically you will fill the insulation blower with the insulation and blow it between the attic floor joists.
You can use rigid foam panels or do as tom silva does with nearly all houses these days.
This limits the maximum thickness of the insulation between the rafters to between 50mm and 175mm.
Check out our how to video at the link below.
Although the paper or foil backing of the insulation is a vapor barrier the added visquine covers completely with no breaks making sure no moisture forms in the cavity.
Insulation if your attic is going to be converted into livable space then you will need to insulate the roof rafters.
If you have a solid floor covering the roof rafters use the claw end of a hammer to pull the floor up in several locations and blow the insulation under the boards.
Hire a pro to install spray foam insulation.
Visquine a painter s drop cloth over the insulation and across the face of the rafters.