Insulation between rafters

The depth of rafter will obviously influence the thickness of insulation you can fit between them, but you can always extend the rafter by attaching a wooden extension to it, since the more insulation you can fit in place, the warmer the loft space will be. Where there is only room for insulation between the rafters to achieve that target, it makes sense to use a thermally efficient material and derive the maximum benefit from minimum space. Rigid polyisocyanurate (PIR) foam insulation boards from Celotex are among the most thermally efficient, commonly available insulation materials on the market.

Apply insulation between rafters when finishing an attic into a heated room, or when building a cathedral ceiling in the home. Garages built without attics are also prime candidates for insulation. I added insulation to my attic rafters and plugged the space between the outdoors and my attic with insulation. Typically, you will fill the insulation blower with the insulation , and blow it between the attic floor joists. Then, blow another layer on top of 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. I would personally use celotex cut tightly in- between the rafters. You need to leave a gap to the rear of the insulation between the membrane and the insulation to allow air to circulate around the roof space. You could then simply clad the area with plasterboard etc. Insulate between rafters when constructing a raise or cathedral, ceiling in a home, or when making the attic a heated space.

Insulation slows the movement of warm air toward cooler air. In unfinished attic spaces, insulate between and over the floor joists to seal off living spaces below. If the air distribution is in the attic space, then consider insulating the rafters to move the distribution into the conditioned space. Once you have these in place, measure the length of the spaces between your rafters.

Cut each piece of insulation an inch or two longer than neede to assure a snug fit. Use your straightedge to compress the insulation before cutting, and use a very sharp utility knife to assure a goo straight cut across the fiberglass batt. The main difference between the two is the location of the insulation. A warm roof is where it is above and between the rafters (so the rafters are kept warm).

A cold roof is where the insulation is between and below the rafters (and the rafters remain cold). Official Site, Ship same day. Deepening the total insulation thickness to 9. R10-ish, even if all wood- half the heat loss, half the melt-out potential. If your attic is going to be converted into livable space, then you will need to insulate the roof rafters. Energy Saver, comes in panels or sheets of different thicknesses.

When used as attic roof insulation , rigid foam can be installed between attic rafters , directly beneath attic rafters , or in both locations. Here is how we cut and fit our PIR insulation to insulate the walls and roof of the house. This technique is the same for all rigid insulation such as kingspan, celotex, xtratherm and ecotherm. If you use open-cell spray foam on your roof rafters , you should cover the finished application with a paint or sealant that retards water vapor. To get the best performance out of spray foam insulation , you must cover the roof rafters and surrounding areas as thoroughly as possible.

Baffles maintain a clear ventilation space and prevent cold air from penetrating into the rafter insulation. Cut AP Foil-Faced foam sheathing to fit snuggly between the rafters , and install against the baffles. Properly cut boards should friction-fit between the rafters without falling out. Generally, it is best to install insulation in the floor and walls of the attic, rather than between the rafters , to reduce heating and cooling costs inside the home. Insulating the attic floor and walls maintains the temperature inside the home without the risk of damaging the rafters.

Install unfaced mass insulation between rafters ensuring a minimum of ventilation space between the mass insulation and the underside of the roof decking. Check with local codes to determine if you must maintain a larger air space. If necessary, you can install vent chutes or baffles to ensure the proper air flow channel. Pitched roof: insulated above and between rafters Design and Installation Insulating a pitched roof at rafter line – to create what is usually known as a warm roof – makes full use of the building volume by making the roof space available for occupation. Insulating Above And Between The Rafters “…is well suited to new build projects and to refurbishments…” Ballytherm insulation can be used on both newly built projects and renovations when the roof is being stripped and replaced.

Cut by hand 25mm rigid insulation , to friction fit between rafters , providing air gap behin before fitting Tri-Iso Multifoil insulation fixed directly to underside of roof rafters using staples, Actis tape to seal all open edges of Multifoil insulation. Currently the floor of my loft is boarded with insulation between the joists under the loft floor boards. The thickness of my rafters is 100mm. At the back of the rafters there is a layer of felt and I assume there is a cavity between this felt and the roof tiles.

The attic is the space from between the insulation on top of the ceiling to the UNDER side of this product (under the top of the rafter ) The purpose of this product is to confine the air flow between this, and the under-side of the roof sheathing (plywood or OSB that the roof shingles attach to) Photo on Home Depots ad page is very misleading. Between the rafters there is plaster (horsehair maybe) directly attached to the roof planking beyond that there is a layer of plywood and new shingles. I insulate between the rafters and keep them exposed. MPack of online at Wickes.

We supply trade quality DIY and home improvement products at great low prices. The answer to this problem is to install Ballytherm insulation , a product that can be used both below and between the rafters as below roof insulation , to create a barrier when installed both below and between the rafters. If insulation is allowed to bunch against the inside slope of the roof between the rafters , air will be blocked before it can traverse the attic.

The rafters in cathedral ceilings are usually made of 2xft. Owens Corning EcoTouch high-density insulation products are designed specifically for these rafters. R-30C and R-38C are available in both kraft-faced and unfaced. An alternative way to insulate your loft is to fit the insulation between and over the rafters – these are the sloping timbers that make up the roof itself.

You can use rigid insulation boar carefully cut to size, or you can have foam insulation sprayed between the rafters. So, what I would propose is putting blocks on the inside of each rafter and screw the insulation to those. The insulation is very ridgi so I doubt you would have to worry about sagging.

I simply attached the insulation with screws and washers. Basically, you cut the sheets down to narrower than the space between the rafters.