Question: Is It Better To Insulate Ceiling Or Roof?

What is the best roof insulation to use?

Batts or blanket insulation are the best choice for ceiling insulation if you have a flat ceiling and pitched metal or tile roof.

The range of batts and blankets that may be suitable for ceiling insulation include; polyester, natural wool, glass wool and rockwool..

How do you insulate a roof with no access?

With the roof you have you would need to gain access to the pitched part of the roof from the inside and then install 50-70mm celotex insulation cut to the size of the roof rafters and threaded down the pitched part of the roof but be sure to leave 50mm gap for air flow then insulate the larger area with min 270mm loft …

How much heat is lost through the attic?

As much as 85 percent of the heat lost in a house passes through the attic. In fact, the U.S. Department of Energy estimates that boosting attic insulation can lower heating costs by 10 to 50 percent (depending on the current level of insulation).

Is it OK to insulate roof rafters?

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. … Also, make sure the attic is well ventilated. Cold roofs prevent ice dams.

How thick should my roof insulation be?

The recommended depth of blanket style insulation (glass or mineral wool) for a loft is 250 to 270 mm. If you already have insulation, but it was put in some time ago, it is worth checking the depth, as only a few years ago the recommended depth of insulation was 200mm, and before that it was as low as 100mm.

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 I insulate my roof?

Yes. If you’re laying insulation between the joists, the roof space will become extremely cold in winter. … If you insulate between the rafters rather than the joists of your attic, the space will be warm and your pipes should be fine.

Does roof insulation make a difference?

Insulation batts, correctly installed in the walls and ceilings will vastly reduce the amount of energy required to heat the house in winter, and keep it cool in summer. In fact, a proper level of insulation can more than halve your heating and cooling bill!

Is it better to insulate attic ceiling or floor?

1 Answer. Since the ceiling in the attic is too low to make it into a living space, you should only insulate the floor. Insulating the ceiling will create a new heating zone, and essentially you will be paying more to heat your attic.

Can you spray foam the underside of your roof?

Most unvented attics incorporate Spray Polyurethane Foam (SPF) on the underside of the roof deck and attic walls. … Using spray foam facilitates the easy and efficient creation of a layer of insulation and a continuous air barrier at all interior surfaces of the attic that are adjacent to the outdoors.

How do you insulate an existing roof?

Above Deck Rigid Foam Insulation for Existing RoofsRemove existing roofing and non-adhered underlayment to expose roof sheathing.Apply continuous air control membrane to existing roof sheathing or implement continuous air control at roof sheathing.Install rigid insulation board in multiple layers with joints offset vertically and horizontally between adjacent layers.More items…•

What is the most effective insulation?

FiberglassFiberglass is the most common insulation used in modern times. Because of how it is made, by effectively weaving fine strands of glass into an insulation material, fiberglass is able to minimize heat transfer.

Should I remove old attic insulation before adding new?

According to ENERGY STAR®, you can put new insulation over old insulation, “unless it is wet. … Any new roll or batt insulation installed over existing insulation in the attic needs to be without a vapor retarder (face). The vapor retarder on top of or between layers of insulation can trap moisture.

Should you insulate the underside of your roof?

Air flow helps to stave off the formation of various wood eating molds and mildews. Just packing R-30 insulation against the underside of your roof deck will insulate it but do nothing to dissipate the inevitable moisture that will be trapped within the insulation.

What is the most efficient insulation?

If you’re starting from scratch and building a home then using insulated concrete forms, which is literally building the insulation into your home’s structure, is the way to go for maximum efficiency. However, if you’re remodeling an existing home, spray foam is probably the best option for maximum energy efficiency.

Should you insulate your attic ceiling?

In unfinished attic spaces, insulate between and over the floor joists to seal off living spaces below. … In finished attic rooms with or without dormer, insulate (2A) between the studs of “knee” walls, (2B) between the studs and rafters of exterior walls and roof, (2C) and ceilings with cold spaces above.

Can you have too much insulation in your ceiling?

Yes, in a TYPICAL situation, a house that has too much insulation can have poor ventiliation which can lead to moisture build up and create mold in turn. HOWEVER, if you need to add insulation, there are ways to keep the proper amount of ventilation while increasing insulation.

What R value insulation do I need for ceiling?

Depending on where you live and the part of your home you’re insulating (walls, crawlspace, attic, etc.), you’ll need a different R-Value. Typical recommendations for exterior walls are R-13 to R-23, while R-30, R-38 and R-49 are common for ceilings and attic spaces.

How do you insulate underside of roof?

Open-cell spray polyurethane foam or closed-cell spray polyurethane foam (ccSPF) insulation can be sprayed along the underside of the roof sheathing to provide a conditioned and insulated attic space that can be durable and efficient in all climate zones (see Figure 1).

Can you put too much insulation in attic?

There’s really no such thing as “too much insulation.” It is more likely that your attic is not ventilating properly, resulting in warmer air on the 2nd floor and an overheated attic. … Lots of attic insulation will keep the 2nd floor temperature from changing quickly.