Insulating between rafters will do no good, because the attic should be ventilated, and the rafter insulation would be between two unheated spaces. You can add insulation to the floor; the more the merrier. … Moisture buildup in the attic is a concern because it can condense into water, often causing mold.
Is it bad to insulate roof?
Insulating Your Attic Can Save You Money
There’s no getting around it: If your house is in a cold climate, keeping it warm in winter is expensive. … The Department of Energy estimates that a properly insulated attic can shave 10 to 50 percent off your heating bill.
Should I insulate my pitched roof?
The amount of heat loss through cold bridging can be minimised by using another layer of insulation either above or below them. So if you are insulating a pitched roof, we would recommend having insulation either above or below the rafters.
What insulation do you use for roof rafters?
Better materials for attic roof insulation are rigid foam boards and spray foam insulation. Spray foam: Technically known as Spray Polyurethane Foam or SPF, spray foam is most commonly applied in the space between attic rafters. It can act as an air and moisture barrier in addition to providing very high R-value.
How do you insulate a roof with exposed rafters?
When the rafters are exposed, such as in timber-frame houses, this technique is not feasible. The basic approach to insulating a roof with exposed rafters involves placing insulation on the exterior side of the finish ceiling and covering the insulation with a layer of sheathing.
Does roof insulation make a difference?
Insulation creates a barrier to heat gain and loss in ceilings, roofs, floors, and walls. It is a cost-effective and practical way to keep your house warmer in winter and cooler in summer. It may also reduce condensation, decreasing your chances of damp and mould.
Do you need an air gap for insulation?
Solid walls, however, must be faced with an insulation product, so they can often eat into floor space depending on the thickness of the insulation as an air gap is needed to prevent condensation and moisture build-up. Insulation with a moisture barrier means you don’t need to leave an air gap during installation.
Should Eaves be insulated?
Insulation should be continued right to the edge of the ceilings but it shouldn’t block the eaves’ ventilation. Ventilation is vital to ensure the necessary air movement to prevent condensation from water vapour, as this can lead to decay of the structural timbers.
How do you keep insulation in rafters?
The friction of the fiberglass insulation material against the rafters, baffles and plywood or wood slats is typically enough to hold it in place. You can assist the friction hold by adding metal wires or bands on the inside of rafters near the edges.
What do rafter vents do?
Rafter vents, often called baffles protect intake vents in your attic from becoming clogged or covered by insulation or debris. Rafter vents ensure the soffit vents are clear and there is a channel for outside air to move into the attic at the soffits and out through roof vents.
What is code for insulation in an attic?
Recommended insulation levels for retrofitting existing wood-framed buildings
|Zone||Add Insulation to Attic|
|Uninsulated Attic||Existing 3–4 Inches of Insulation|
|1||R30 to R49||R25 to R30|
|2||R30 to R60||R25 to R38|
|3||R30 to R60||R25 to R38|