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It is generally recommended to eliminate existing shingles when installing new ones. Certain locations in the attic room can present significant fire and carcinogen. Prior to air sealing and protecting an attic, guarantee you or your service provider address the adhering to health and wellness and safety concerns. Inspect the chimney and surrounding mounting for indications of charring, soot deposits, collapsing masonry or mortar, or proof that the smokeshaft lining is deteriorating.


Have a chimney professional repair service, seal and insulate it at the very same time. Typically a gap exists where a stonework smokeshaft goes through the attic. To air seal this location, first mount sheet metal blinking to connect this void and then secure all the joints with a non-combustible sealant (ensure the product is ranked for this application).


An air and vapour barrier covers the flooring of the attic room and is sealed to the joists with acoustical sealer. Factory-built steel chimneys need to be avoided speaking to insulation by a minimum 75 mm (3 in.) unless or else specified by supplier or local authorities. Set up a non-flammable radiation guard that maintains a 75-mm (3-in.) air area between the smokeshaft and insulation.

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The top of the radiation guard should also be a minimum of 75 mm (3 in.) higher than the degree of existing or brand-new insulation to be added. To avoid insulation from falling back the shield, connect a clamp-type tornado collar without sealer on top of the radiation guard, as received Figure 5-4.


A radiation barrier produces a 75 millimetre or 3-inch air area around the chimney and prolongs 75 millimetres or 3 inches over the attic room insulation, keeping the range from flammable products. The top of the obstacle is a tornado collar secured, not secured, to the smokeshaft. Over the ceiling, the air and vapour barrier is covered around the drywall to call the firestop sealer.


A collar-like ceiling trim plate is affixed listed below the firestop. Common interior recessed lights are tough to air seal properly and can end up being a fire risk if covered with insulation.

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This additionally offers the chance to much better seal and shield the existing dental caries. If you find a significant amount of pet droppings and vermin in the attic room, do not disrupt them due to the fact that they can harbour quickly air-borne moulds, bloodsucker eggs and microorganisms that can cause severe ailment.


Seal the following areas: Around the plumbing stack and any other pipes. For plastic plumbing stacks that go up and down because of thermal growth, make use of a versatile gasket or a polyethylene sleeve secured to a plywood collar (see Figure 5-6). Around cables or ceiling lighting fixtures that permeate the attic flooring and partition and outside wall surface top plates (see Number 5-7 and Figure 5-8).

Building codes call for that air rooms between chimneys and floor or ceiling settings up via which they pass be sealed with a non-combustible fire stop (see Number 5-3 and Figure 5-4). There is usually a void between the party wall surface (such as the shared wall surface between units in duplexes, triplexes and row houses) and the edge of the attic room flooring.

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


After air securing, attic room ventilation is your second line of defence against the water vapour that may have located its way into the attic. It makes sure a chillier, well-vented attic room space much less vulnerable to the development of ice dams at the eaves.




You may have to find roofing system or soffit vents from outdoors if they are not plainly noticeable from inside the attic. Residences with actually peaked roof coverings and easily accessible attics are the simplest to vent by using the proportion of 1 to 300. This proportion describes unblocked vent area to the insulated ceiling area.


Do not use electrical exhaust followers for attic air flow as these can attract much more air than can be supplied via the soffit vents. This will really pull residence air right into the attic room, resulting in better warm loss and wetness accumulation. They are also vulnerable to failure, sound production and raised energy use.

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The area of vents is as crucial as their number and type. Usually, a combination of kinds and locations will certainly work best. The complying with Parts detail the ideal method relying on your attic room type. After you have actually evaluated the attic and brought out any kind of restorative job, emphasis first on air and wetness control.


On the other hand, spray foam offers air sealing and a first layer of high top quality insulation that can be covered as much as the desired RSI (R) degree (Solar attic fans). If the attic room retrofit is being completed in conjunction with indoor renovations, the easiest approach is to set up a new, single air and vapour barrier on the bottom of the ceiling joists

Around the smokeshaft. Building ordinance call for that air areas in between chimneys and flooring or ceiling assemblies whereby they pass be secured with a non-combustible fire stop (see Number 5-3 and Number 5-4). Along the edge of common wall surfaces. There is commonly a gap in between the event wall (such as the shared wall surface between devices in duplexes, triplexes and row houses) and the side of the attic room floor.


A hefty polyethylene sheet which is caulked with acoustical sealant and stapled to the ceiling encloses the electric box. An electric wire leads away from the electrical box and down with an opening into an interior wall. Openings around electrical cords are full of caulking or foam sealant, and caulking seals spaces along the top of the indoor wall surfaces.

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After air sealing, attic air flow is your 2nd line of support versus the water vapour that might have discovered its way into the attic room. It makes certain a chillier, well-vented attic space much less susceptible to the formation of ice dams at the eaves.


You might have to locate roofing system or soffit vents from outside if they are not plainly visible from inside the attic. Homes with peaked roofs and available attic rooms are the most convenient to vent by using the proportion of 1 to 300. This ratio refers to unhampered vent location to the protected ceiling area.


Do not utilize electrical exhaust fans for attic room air flow as these can draw extra air than can be supplied via the soffit vents. This will really draw home air right into the attic, resulting in better warm loss and dampness build-up. They are additionally susceptible to failure, sound production and boosted energy usage.

The place of vents is as essential as their number and type. Usually, a combination of types and locations will function best. The following Components information the most effective method depending upon your attic room type. After you have checked the attic room and lugged Website out any kind of restorative work, focus initially on air and dampness control.

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On the various other hand, spray foam uses air securing and an initial layer of premium quality insulation that can be topped approximately the wanted RSI (R) degree. If the attic retrofit is being finished along with indoor restorations, the most convenient technique is to install a brand-new, single air and vapour obstacle on the underside of the ceiling joists.