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It is generally suggested to get rid of existing shingles when mounting brand-new ones. Specific locations in the attic can position major fire and health dangers. Prior to air sealing and shielding an attic, guarantee you or your professional address the complying with health and wellness and safety and security concerns. Check the smokeshaft and surrounding mounting for indications of charring, residue down payments, crumbling stonework or mortar, or proof that the chimney cellular lining is degrading.


Have a chimney professional repair work, seal and insulate it at the same time. Frequently a gap exists where a stonework chimney goes through the attic. To air seal this location, first mount sheet steel flashing to bridge this space and after that secure all the joints with a non-combustible sealer (make sure the item is rated for this application).


An air and vapour obstacle covers the flooring of the attic room room and is sealed to the joists with acoustical sealer. Factory-built metal smokeshafts ought to be avoided getting in touch with insulation by a minimum 75 mm (3 in.) unless otherwise defined by producer or regional authorities. Set up a non-flammable radiation guard that maintains a 75-mm (3-in.) air area in between the chimney and insulation.

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The top of the radiation shield must also be a minimum of 75 mm (3 in.) greater than the degree of existing or new insulation to be added. To avoid insulation from falling back the shield, affix a clamp-type storm collar without sealer at the top of the radiation guard, as shown in Figure 5-4.


A radiation barrier produces a 75 millimetre or 3-inch air room around the chimney and prolongs 75 millimetres or 3 inches above the attic insulation, preserving the distance from combustible products. The top of the barrier is a storm collar secured, not sealed, to the smokeshaft. Over the ceiling, the air and vapour barrier is twisted around the drywall to get in touch with the firestop sealer.


A collar-like ceiling trim plate is attached below the firestop. Work safely around electric circuitry (shut off the power). Seek advice from an electrical specialist if doubtful wiring or rusty electrical links are present. Basic indoor recessed lights are challenging to air seal properly and can become a fire threat if covered with insulation.

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As an option to standard recessed or pot lights take into consideration light-emitting diode (LED) flush or level place components for better power effectiveness. This also supplies the opportunity to much better seal and protect the existing tooth cavity. Guarantee that fixture installation guidelines are adhered to. If you discover a substantial quantity of pet droppings and vermin in the attic room, do not disturb them because they can harbour easily air-borne moulds, bloodsucker eggs and germs that can create serious health problem.


Seal the following areas: Around the pipes pile and any other pipelines. For plastic pipes stacks that go up and down due to thermal expansion, 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 penetrate the attic room flooring and dividers and outside wall top plates (see Figure 5-7 and Number 5-8).

Around the smokeshaft. Structure codes call for that air areas between smokeshafts and flooring or ceiling assemblies where they pass be secured with a non-combustible fire stop (see Figure 5-3 and Figure 5-4). Along the side of shared wall surfaces. There is frequently a space in between the party wall surface (such as the shared wall between systems in duplexes, triplexes and row houses) and the side of the attic floor.

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A hefty polyethylene sheet which is caulked with acoustical sealer and stapled to the ceiling frames the electrical box. An electric cable diverts from the electrical box and down with a hole into an indoor wall. Openings around electric cables are full of caulking or foam sealer, and caulking seals spaces along the top of the indoor wall surfaces.


After air securing, attic room ventilation is your 2nd line of support against the water vapour that may have found its method into the attic room. It guarantees a cooler, well-vented attic area less susceptible to the formation of ice dams at the eaves.




You may have to locate roofing or soffit vents from outdoors if they are not clearly noticeable from inside the attic. Houses with actually peaked roof coverings and accessible attics are the simplest to vent by utilizing the proportion of 1 to 300. This ratio describes unhampered air vent area to the insulated ceiling location.


Do not make use of electric exhaust fans for attic air flow as these can draw more air than can be provided through the soffit vents. This will really pull residence air right into the attic, leading to better warmth loss and moisture accumulation. They are also vulnerable to failing, noise production and raised energy use.

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The area of vents is as important as their number and type. Often, a blend of types and locations will function best. The following Parts information the most effective approach relying on your attic room type. After you have inspected the attic and executed any type of restorative job, focus first on air and moisture control.


On the various other hand, spray foam uses air sealing and an initial layer of excellent quality insulation that can be topped approximately the desired RSI (R) level (HVAC maintenance). If the attic room retrofit is being completed together with indoor renovations, the simplest strategy is to set up a new, single air and vapour obstacle on the bottom of the ceiling joists

Around the chimney. Building regulations call for that air rooms between smokeshafts and floor or ceiling assemblies with which they pass be secured with a non-combustible fire stop (see Number 5-3 and Number 5-4). Along the side of shared wall surfaces. There is often a void between the celebration wall (such as the common wall between units in duplexes, triplexes and row residences) and the edge of the attic floor.


A hefty polyethylene sheet which is caulked with acoustical sealant and stapled to the ceiling encases the electric box. An electrical cable leads away from the electric box and down via an opening right into an interior wall surface. Openings around electrical wires are filled up with caulking or foam sealant, and caulking seals gaps along the top of the interior wall surfaces.

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Attic ventilation serves a number of objectives. It minimizes summer season warm accumulation, extending the life of roofing and decreases air conditioner lots. After air sealing, attic air flow is your 2nd line of defence against the water vapour that may have found its method into the attic room. It guarantees a cooler, well-vented attic room area much less vulnerable to the formation of ice dams at the eaves.


You might need to find roof or soffit vents from outdoors if they are not clearly visible from inside the attic. Houses with actually peaked roofings and obtainable attic rooms are the most convenient to air visit vent by utilizing the ratio of 1 to 300. This proportion refers to unobstructed air vent area to the insulated ceiling location.


Additionally, do not utilize electric exhaust fans for attic ventilation as these can draw a lot more air than can be supplied via the soffit vents. This will actually draw home air right into the attic, leading to greater heat loss and wetness build-up. They are likewise susceptible to failing, sound manufacturing and boosted energy use.

The following Components information the finest method depending on your attic type. After you have actually inspected the attic and brought out any type of therapeutic job, focus first on air and dampness control.

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On the various other hand, spray foam offers air securing and a first layer of high quality insulation that can be covered approximately the wanted RSI (R) degree. If the attic retrofit is being finished in conjunction with interior remodellings, the simplest technique is to set up a brand-new, solitary air and vapour obstacle on the bottom of the ceiling joists.