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It is generally suggested to get rid of existing roof shingles when mounting new ones. Particular locations in the attic can pose significant fire and health and wellness threats. Prior to air sealing and shielding an attic, ensure you or your professional address the adhering to health and wellness concerns. Inspect the smokeshaft and bordering framing for indications of charring, soot down payments, falling apart stonework or mortar, or evidence that the smokeshaft cellular lining is degrading.


Have a chimney specialist repair work, seal and protect it at the very same time. Generally a void exists where a stonework chimney travels through the attic. To air seal this location, first set up sheet steel flashing to bridge this void and afterwards seal all the joints with a non-combustible sealer (guarantee the product is ranked for this application).


An air and vapour barrier covers the floor of the attic area and is sealed to the joists with acoustical sealant. Factory-built metal chimneys should be maintained from speaking to insulation by a minimum 75 mm (3 in.) unless otherwise defined by supplier or local authorities. Mount a non-flammable radiation guard that keeps a 75-mm (3-in.) air room in between the smokeshaft and insulation.

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The top of the radiation guard must also be a minimum of 75 mm (3 in.) more than the level of existing or new insulation to be included. To stop insulation from falling back the shield, affix a clamp-type tornado collar without sealant on top of the radiation shield, as displayed in Number 5-4.


A radiation barrier develops a 75 millimetre or 3-inch air area around the smokeshaft and extends 75 millimetres or 3 inches over the attic insulation, keeping the distance from flammable materials. The top of the obstacle is a storm collar secured, not sealed, to the smokeshaft. Above the ceiling, the air and vapour obstacle is twisted around the drywall to contact the firestop sealer.


A collar-like ceiling trim plate is affixed below the firestop. Typical interior recessed lights are tough to air seal effectively and can become a fire danger if covered with insulation.

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This additionally offers the chance to much better seal and insulate the existing cavity. If you find a considerable quantity of animal droppings and vermin in the attic room, do not disturb them due to the fact that they can harbour quickly airborne moulds, bloodsucker eggs and microorganisms that can cause serious illness.


Seal the complying with locations: Around the pipes stack and any type of various other pipes. For plastic plumbing stacks that relocate up and down due to thermal expansion, utilize an adaptable gasket or a polyethylene sleeve secured to a plywood collar (see Number 5-6). Around wires or ceiling lighting fixtures that pass through the attic room flooring and dividing and outside wall surface top plates (see Figure 5-7 and Figure 5-8).




Around the chimney. Structure codes call for that air rooms in between smokeshafts and flooring or ceiling settings up whereby they pass be sealed with a non-combustible fire stop (see Figure 5-3 and Figure 5-4). Along the edge of shared wall surfaces. There is commonly a void in between the celebration wall (such as the common wall surface in between devices in duplexes, triplexes and row residences) and the edge of the attic floor.

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A heavy polyethylene sheet which is caulked with acoustical sealer and stapled to the ceiling encloses the electrical box. An electric cord leads away from the electrical box and down via a hole right into an indoor wall surface. Holes around electric cables are filled with caulking or foam sealant, and caulking seals voids along the top of the indoor wall surfaces.


Attic air flow serves a variety of objectives. It minimizes summertime heat buildup, lengthening the life of roof and lowers ac unit tons. After air securing, attic air flow is your 2nd line of protection versus the water vapour that may have found its means into the attic room - Radiant barriers. It makes certain a colder, well-vented attic room room much less prone to the development of ice dams at the eaves.




You may have to find roof covering or soffit vents from outdoors if they are not plainly noticeable from inside the attic. Homes with actually peaked roof coverings and obtainable attic rooms are the easiest to vent by utilizing the ratio of 1 to 300. This ratio refers to unblocked vent location to the protected ceiling location.


Likewise, do not utilize electrical exhaust fans for attic ventilation as these can draw more air than can be provided through the soffit vents. This will actually pull residence air right into the attic room, resulting in greater heat loss and dampness build-up. They are likewise susceptible to failure, sound manufacturing and boosted power use.

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The complying with Parts detail the finest approach depending on your attic kind. After you have inspected the attic and brought out any restorative work, focus first on air and dampness control.


On the other hand, spray foam uses air sealing and a preliminary layer of excellent quality insulation that can be topped approximately the desired RSI (R) level (HVAC maintenance). If the attic room retrofit is being finished along with indoor improvements, the most convenient strategy is to set up a brand-new, solitary air and vapour barrier on the underside of the ceiling joists


Around the chimney. Building codes call for that air spaces between smokeshafts and floor or ceiling settings up where they pass be sealed with a non-combustible fire stop (see Number 5-3 and Figure 5-4). Along the side of common walls. There is often a gap between the event wall surface (such as the common wall surface in between devices in duplexes, triplexes and row homes) and the edge of the attic room flooring.


A hefty polyethylene sheet which is caulked with acoustical sealer and stapled to the ceiling encloses the electrical box. An electric cord diverts from the electric box and down with a hole right into an indoor wall. Openings around electrical cords are loaded with caulking or foam sealant, and caulking seals spaces along the top of the interior wall surfaces.

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After air sealing, attic room air flow is your second line of defence against the water vapour that might have located its way into the attic room. It ensures a cooler, well-vented attic area much less vulnerable to the development of ice dams at the eaves.


You might have to locate roof covering or soffit vents from outdoors if they are not plainly visible from inside the attic. Houses with peaked roofing systems and easily accessible attics are the simplest to air vent by utilizing the ratio of 1 to 300. This ratio refers to unhampered vent area to the insulated ceiling area.


Do not use electric exhaust followers for attic room ventilation as these can draw much more air than can be supplied via the soffit vents. This will in fact pull house air right into the attic room, leading to better warm loss and dampness buildup. They are also prone to failing, noise production and increased power usage.


The place of vents find out is as crucial as their number and type. Typically, a combination of types and locations will function best. The adhering to Components detail the most effective approach depending upon your attic room kind. After you have actually evaluated the attic and executed any type of therapeutic job, emphasis initially on air and moisture control.

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On the other hand, spray foam offers air securing and a preliminary layer of high top quality insulation that can be covered as much as the desired RSI (R) degree. If the attic room retrofit is being finished in combination with indoor restorations, the simplest approach is to mount a new, single air and vapour obstacle on the bottom of the ceiling joists.