Spray foam insulation is a great product.
How to apply attic insulation at eave space.
Design the roof to allow full insulation over the top plates of the exterior walls.
Both can be added to uninsulated attics or layered over existing material.
I can also tell you that 73 of all statistics are made up on the spot so please don t ask for.
Insulation often clogs the space between the rafters blocking air from traveling to and from the soffit area.
Apply a 2 inch layer of spray foam insulation r 10 to r 12 directly to the interior surface of the roof sheathing.
You can then apply batt insulation around the foam without worrying too much about the air space.
That means insulating the attic floor only not the walls and having vents in the roof.
Secure the insulation using stay wires.
Loose fill or batt the common term for blanket insulation.
Press the wires up against the insulation and the pointed ends of the wires will dig into the joists holding the insulation in place.
This will keep the surface warm and help minimize condensation.
Install raised heel trusses or use another roof framing method that allows space to install insulation over the top plates of the exterior walls or install high density insulation to achieve an r value that meets or exceeds code minimums for attic insulation.
Install air chutes or clear them if they re clogged photo 1.
A finished attic should be insulated much like the rest of the house with insulation in the walls and ceiling.
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.
Generally spray foams have to be applied by a professional.
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.
Aluminum or vinyl soffits eaves installed over plywood soffits that don t have venting holes.
Homes insulated with it can be some of the most efficient and comfortable homes built.
Five common causes of poor attic venting.
For diy attic insulation you ve got two choices.