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It is normally suggested to eliminate existing shingles when installing new ones. Particular locations in the attic room can posture serious fire and health and wellness threats. Prior to air sealing and insulating an attic room, ensure you or your specialist address the following health and wellness concerns. Examine the smokeshaft and surrounding framing for indicators of charring, residue deposits, crumbling stonework or mortar, or evidence that the smokeshaft lining is weakening.


Have a smokeshaft specialist fixing, seal and protect it at the same time. Generally a gap exists where a stonework chimney travels through the attic. To air seal this location, first mount sheet metal blinking to bridge this space and after that seal all the joints with a non-combustible sealer (make sure the product is ranked for this application).


An air and vapour barrier covers the floor of the attic room and is secured to the joists with acoustical sealer. Factory-built metal smokeshafts ought to be avoided calling insulation by a minimum 75 mm (3 in.) unless otherwise defined by maker or local authorities. Set up a non-flammable radiation guard that preserves a 75-mm (3-in.) air space between the chimney and insulation.

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The top of the radiation guard need to additionally be a minimum of 75 mm (3 in.) more than the level of existing or new insulation to be added. To stop insulation from dropping behind the guard, affix a clamp-type tornado collar without sealer at the top of the radiation shield, as received Figure 5-4.


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


A collar-like ceiling trim plate is attached below the firestop. Basic interior recessed lights are hard to air seal effectively and can become a fire threat if covered with insulation.

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This also supplies the opportunity to far better seal and protect the existing dental caries. If you locate a significant amount of animal droppings and vermin in the attic, do not disrupt them since they can harbour quickly air-borne moulds, bloodsucker eggs and microorganisms that can create extreme ailment.


Seal the adhering to locations: Around the pipes pile and any kind of various other pipelines. For plastic pipes heaps that go up and down because of thermal development, make use of an adaptable gasket or a polyethylene sleeve secured to a plywood collar (see Number 5-6). Around cords or ceiling lighting fixtures that pass through the attic room flooring and partition and exterior wall surface leading plates (see Figure 5-7 and Figure 5-8).




Around the chimney. Building codes need that air rooms between smokeshafts and flooring or ceiling assemblies where they pass be sealed with a non-combustible fire quit (see Figure 5-3 and Figure 5-4). Along the side of common walls. There is commonly a space in between the party 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 electrical cable diverts from the electrical box and down with an opening into an indoor wall surface. Openings around electrical cords are loaded with caulking or foam sealer, and caulking seals gaps along the top of the indoor walls.


After air sealing, attic room ventilation is your second line of protection versus the water vapour Get the facts that may have found its way into the attic. It guarantees a colder, well-vented attic space less prone to the formation of ice dams at the eaves.




You might need to situate roof covering or soffit vents from outdoors if they are not clearly visible from inside the attic. Residences with actually peaked roofings and easily accessible attics are the easiest to vent by using the proportion of 1 to 300. This proportion refers to unobstructed air vent location to the insulated ceiling location.


Do not make use of electrical exhaust fans for attic room air flow as these can draw extra air than can be provided through the soffit vents. This will in fact draw residence air into the attic, leading to greater heat loss and dampness build-up. They are likewise vulnerable to failure, sound production and increased energy usage.

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The adhering to Parts detail the ideal method depending on your attic room type. After you have checked the attic room and carried out any kind of remedial work, focus first on air and moisture control.


On the other hand, spray foam uses air securing and a first layer of premium quality insulation that can be topped as much as the preferred RSI (R) degree (Duct cleaning). If the attic retrofit is being completed together with indoor restorations, the most convenient method is to set up a new, single air and vapour obstacle on the bottom of the ceiling joists


Around the smokeshaft. Building codes require that air areas between chimneys and flooring or ceiling assemblies where they pass be sealed with a non-combustible fire quit (see Figure 5-3 and Number 5-4). Along the side of shared wall surfaces. There is typically a gap between the event wall (such as the common wall 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 sealer and stapled to the ceiling encases the electrical box. An electric cord leads away from the electrical box and down with an opening right into an interior wall. Holes around electric cords are loaded with 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 second line of defence against the water vapour that might have discovered its way into the attic. It makes certain a cooler, well-vented attic space much less susceptible to the formation of ice dams at the eaves.


You may need to find roof covering or soffit vents from outdoors if they are not clearly noticeable from inside the attic room. Houses with actually peaked roof coverings and obtainable attic rooms are the easiest to vent by utilizing the proportion of 1 to 300. This ratio describes unblocked air vent location to the insulated ceiling location.


Additionally, do not make use of electric exhaust followers for attic ventilation as these can draw more air than can be provided through the soffit vents. This will actually pull residence air into the attic room, leading to greater warm loss and moisture build-up. They are also susceptible to failure, sound production and raised energy usage.


The adhering to Parts information the best approach depending on your attic room kind. After you have actually inspected the attic room and lugged out any type of remedial work, focus initially on air and wetness control.

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On the various other hand, spray foam offers air securing and a preliminary layer of premium quality insulation that can be covered up to the wanted RSI (R) level. If the attic room retrofit is being completed together with interior renovations, the simplest approach is to set up a new, single air and vapour obstacle on the underside of the ceiling joists.