For decades the typical solution to this problem was to install ventilation baffles near the eaves connecting the air space above the soffit vents with the attic and then to install as much fluffy insulation usually fiberglass or cellulose as there was room for between the top plate of the exterior wall and the ventilation baffle.
How to apply attic insulation at eave space.
How to insulate a finished attic.
That means insulating the attic floor only not the walls and having vents in the roof.
Insulation often clogs the space between the rafters blocking air from traveling to and from the soffit area.
Both can be added to uninsulated attics or layered over existing material.
With a finished attic insulation must help keep the attic areas comfortable.
Aluminum or vinyl soffits eaves installed over plywood soffits that don t have venting holes.
Space stay wires about two feet apart.
Once you ve decided which type is best for you examine the material options and prices to home in on the right product.
Apply a 2 inch layer of spray foam insulation r 10 to r 12 directly to the interior surface of the roof sheathing.
I can also tell you that 73 of all statistics are made up on the spot so please don t ask for.
Install air chutes or clear them if they re clogged photo 1.
Homes insulated with it can be some of the most efficient and comfortable homes built.
Press the wires up against the insulation and the pointed ends of the wires will dig into the joists holding the insulation in place.
A finished attic should be insulated much like the rest of the house with insulation in the walls and ceiling.
You can then apply batt insulation around the foam without worrying too much about the air space.
These are precut lengths of 14 gauge spring steel wire that are slightly longer than the space between the joists.
I ve been in plenty of these homes and can tell you that when spray foam is installed properly they outperform 99 of fiberglass batt insulated stick built homes.
Secure the insulation using stay wires.
For diy attic insulation you ve got two choices.
Spray foam insulation is a great product.
Design the roof to allow full insulation over the top plates of the exterior walls.
Five common causes of poor attic venting.
Generally spray foams have to be applied by a professional.