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It is typically suggested to get rid of existing roof shingles when installing new ones. Particular locations in the attic can posture major fire and carcinogen. Before air sealing and shielding an attic, ensure you or your specialist address the following health and wellness problems. Check the chimney and bordering mounting for signs of charring, soot deposits, falling apart stonework or mortar, or evidence that the chimney lining is degrading.


Have a smokeshaft professional fixing, seal and insulate it at the same time. Commonly a space exists where a stonework smokeshaft goes through the attic room. To air seal this area, first install sheet metal flashing to link this void and after that secure all the joints with a non-combustible sealer (make certain the product is ranked for this application).


An air and vapour barrier covers the floor of the attic room area and is sealed to the joists with acoustical sealant. Factory-built steel smokeshafts need to be avoided getting in touch with insulation by a minimum 75 mm (3 in.) unless otherwise specified by maker or regional authorities. Set up a non-flammable radiation shield that maintains a 75-mm (3-in.) air room in between the smokeshaft and insulation.

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The top of the radiation guard ought to additionally be a minimum of 75 mm (3 in.) greater than the level of existing or brand-new insulation to be added. To stop insulation from dropping behind the shield, affix a clamp-type storm collar without sealer on top of the radiation guard, as displayed in Number 5-4.


A radiation barrier develops a 75 millimetre or 3-inch air area around the smokeshaft and prolongs 75 millimetres or 3 inches above the attic room insulation, maintaining the range from flammable products. The top of the barrier is a tornado collar clamped, not sealed, to the chimney. 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 affixed below the firestop. Standard interior recessed lights are tough to air seal effectively and can end up being a fire threat if covered with insulation.

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This also supplies the chance to far better seal and protect the existing dental caries. If you discover a considerable amount of animal droppings and vermin in the attic room, do not disturb them since they can harbour quickly air-borne moulds, parasite eggs and germs that can create severe ailment.


Seal the complying with locations: Around the pipes stack and any type of various other pipes. For plastic plumbing heaps that go up and down due to thermal development, make use of a flexible gasket or a polyethylene sleeve sealed to a plywood collar (see Figure 5-6). Around cables or ceiling lights that pass through the attic room floor and partition and exterior wall surface top plates (see Figure 5-7 and Figure 5-8).

Structure codes call for that air rooms in between smokeshafts and floor or ceiling assemblies through which they pass be secured with a non-combustible fire quit (see Figure 5-3 and Number 5-4). There is often a gap between the party wall (such as the shared wall in between devices in duplexes, triplexes and row residences) and the edge of the attic room floor.

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A heavy polyethylene sheet which is caulked with acoustical sealant and stapled to the ceiling encases the electric box. An electrical wire leads away from the electrical box and down via a hole into an indoor wall. Holes around electric cables are full of caulking or foam sealer, and caulking seals spaces along the top of the indoor walls.


After air sealing, attic room air flow is your 2nd line of defence versus the water vapour that might have found its method right into the attic. It makes certain a colder, well-vented attic room much less susceptible to the formation of ice dams at the eaves.




You may have to situate roofing system or soffit vents from outside if they are not plainly noticeable from inside the attic room. Residences with peaked roofing systems and easily accessible attic rooms are the most convenient to air vent by making use of the ratio of 1 to 300. This ratio refers to unobstructed vent location to the protected ceiling location.


Do not make use of electric exhaust fans for attic room air flow as these can attract more air than can be provided via the soffit vents. This will in fact draw house air right into the attic room, causing higher heat loss and wetness build-up. They are also prone to failing, sound manufacturing and raised power use.

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The place of vents is as essential as their number and kind. Typically, a blend of types and places will function best. The following Parts detail the ideal method relying on your attic kind. After you have evaluated the attic and lugged out any type of therapeutic work, emphasis first on air and wetness control.


On the other hand, spray foam uses continue reading this air securing and a preliminary layer of excellent quality insulation that can be covered approximately the desired RSI (R) degree (HVAC maintenance). If the attic room retrofit is being finished combined with interior restorations, the most convenient method is to set up a new, solitary air and vapour barrier on the bottom of the ceiling joists

Structure codes require that air rooms between smokeshafts and flooring or ceiling settings up with which they pass be sealed with a non-combustible fire quit (see Figure 5-3 and Figure 5-4). There is frequently a void between the event wall surface (such as the shared wall surface in between units in duplexes, triplexes and row residences) and the edge of the attic room flooring.


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

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After air securing, attic ventilation is your second line of defence against the water vapour that might have discovered its method right into the attic. It makes sure a cooler, well-vented attic area much less prone to the formation of ice dams at the eaves.


You may need to situate roof or soffit vents from outside if they are not plainly noticeable from inside the attic room. Homes with peaked roofings and easily accessible attic rooms are the simplest to air vent by using the proportion of 1 to 300. This proportion describes unblocked vent area to the insulated ceiling location.


Do not make use of electric exhaust fans for attic room air flow as these can draw more air than can be provided via the soffit vents. This will in fact draw residence air right into the attic room, resulting in better warm loss and wetness accumulation. They are additionally prone to failure, sound production and increased power use.

The area of vents is as important as their number and type. Usually, a mix of kinds and areas will certainly work best. The following Parts detail the most effective strategy depending on your attic type. After you have checked the attic room and lugged out any remedial work, focus first on air and dampness control.

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On the various other hand, spray foam supplies air sealing and a preliminary layer of top quality insulation that can be topped up to the desired RSI (R) degree. If the attic room retrofit is being completed along with indoor renovations, the most convenient method is to set up a new, solitary air and vapour obstacle on the bottom of the ceiling joists.