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It is commonly recommended to remove existing shingles when installing brand-new ones. Particular locations in the attic can pose serious fire and health hazards. Before air sealing and insulating an attic, guarantee you or your service provider address the following health and wellness problems. Examine the smokeshaft and surrounding mounting for indicators of charring, soot deposits, collapsing stonework or mortar, or proof that the chimney lining is deteriorating.


Have a smokeshaft professional repair service, seal and protect it at the same time. Generally a space exists where a masonry chimney travels through the attic. To air seal this location, first mount sheet metal blinking to connect this gap and afterwards seal all the joints with a non-combustible sealer (guarantee the item is ranked for this application).


An air and vapour obstacle covers the floor of the attic room area and is sealed to the joists with acoustical sealer. Factory-built metal smokeshafts must be kept from speaking to insulation by a minimal 75 mm (3 in.) unless otherwise specified by supplier or regional authorities. Install a non-flammable radiation guard that maintains a 75-mm (3-in.) air room in between the chimney and insulation.

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The top of the radiation guard should also be a minimum of 75 mm (3 in.) greater than the level of existing or new insulation to be added. To protect against insulation from dropping behind the shield, affix 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 space around the smokeshaft and expands 75 millimetres or 3 inches above the attic room insulation, keeping the range from combustible materials. The top of the barrier is a storm collar clamped, not sealed, to the chimney. Above the ceiling, the air and vapour barrier is wrapped around the drywall to speak to the firestop sealer.


A collar-like ceiling trim plate is attached below the firestop. Work safely around electrical wiring (transform off the power). Speak with an electric service provider if suspicious wiring or corroded electrical connections exist. Conventional indoor recessed lights are difficult to air seal efficiently and can become a fire hazard if covered with insulation.

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This likewise supplies the opportunity to much better seal and insulate the existing dental caries. If you find a considerable quantity of pet droppings and vermin in the attic room, do not interrupt them because they can harbour quickly air-borne moulds, bloodsucker eggs and germs that can trigger extreme ailment.


Seal the following areas: Around the pipes stack and any type of other pipes. For plastic plumbing stacks that move up and down because of thermal development, make use of an adaptable gasket or a polyethylene sleeve secured to a plywood collar (see Figure 5-6). Around cables or ceiling light components that pass through the attic room flooring and dividers and outside wall top plates (see Number 5-7 and Number 5-8).




Around the smokeshaft. Building regulations need that air rooms in between chimneys and floor or ceiling assemblies through which they pass be sealed with a non-combustible fire quit (see Figure 5-3 and Figure 5-4). Along the edge of shared wall surfaces. There is often a space between the celebration wall surface (such as the common wall surface between systems in duplexes, triplexes and row homes) and the edge of the attic flooring.

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A heavy polyethylene sheet which is caulked with acoustical sealer and stapled to the ceiling frames the electric box. An electric cord diverts from the electric box and down with an opening into an indoor wall. Holes around electric wires are full of caulking or foam sealant, and caulking seals spaces along the top of the interior wall surfaces.


After air securing, attic ventilation is your second line of protection versus the water vapour that might have found its method right into the attic room. It guarantees a chillier, well-vented attic room area less vulnerable to the development of ice dams at the eaves.




You may have to find roofing or soffit vents from outdoors if they are not clearly visible from inside the attic. Homes with actually peaked roofings and easily accessible attic rooms are the simplest to vent by utilizing the proportion of 1 to 300. This proportion refers to unblocked air vent location to the protected ceiling area.


Also, do not use electrical exhaust fans for attic room air flow as these can draw much more air than can be supplied via the soffit vents. This will really pull house air right into the attic, causing better warm loss and moisture buildup. They are additionally susceptible to failure, sound production and increased energy usage.

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The location of vents is as vital as their number and type. Typically, a mixture of types and places will certainly work best. The complying with Parts detail the very best method depending on your attic kind. After you have inspected the attic room and performed any type of therapeutic work, focus initially on air and dampness control.


On the various other hand, spray foam provides air sealing and a preliminary layer of top quality insulation that can be topped up to the preferred RSI (R) degree (Home energy audit). If the attic retrofit is being completed along with interior restorations, the most convenient approach is to set up a new, single air and vapour barrier on the bottom of the ceiling joists


Building codes call for that air areas in between chimneys and flooring or ceiling assemblies with which they pass be secured with a non-combustible fire stop (see Number 5-3 and Figure 5-4). There is frequently a void between the celebration wall (such as the shared wall surface between systems in duplexes, triplexes and row homes) and the side of the attic flooring.


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

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Attic air flow offers a variety of purposes. It decreases summertime warm build-up, lengthening the life of roofing and decreases a/c unit tons. After air securing, attic ventilation is your 2nd line of defence versus the water vapour that might have discovered its method into the attic room. It ensures a colder, well-vented attic room much less vulnerable to the formation of ice dams at the eaves.


You might have to locate roof or soffit vents from outdoors if they are not plainly visible from inside the attic room. Homes with peaked roofs and accessible attic rooms are the simplest to vent by making use of the proportion of 1 to 300. This ratio refers to unhampered vent area to the insulated ceiling location.


Likewise, do not use electrical exhaust followers for attic air flow as these can draw more air than can be provided via the soffit vents. This will in fact draw house air into the attic room, resulting in better warm loss and dampness buildup. They are additionally susceptible to failing, noise manufacturing and enhanced energy usage.


The location of vents is as vital as their number and type. Typically, a blend of kinds and areas will certainly function best. The following Parts detail the very best approach depending on your attic type. After you have examined the attic and executed any remedial job, emphasis first on air and wetness control.

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On the other hand, spray foam supplies air sealing and an initial layer of top quality insulation that can be topped up to the preferred RSI (R) level. If the attic retrofit is being finished in combination with interior improvements, the simplest approach is to mount a brand-new, single air and vapour obstacle on the bottom of the her explanation ceiling joists.