Green Attics - Questions

It is generally suggested to remove existing shingles when installing new ones. Specific locations in the attic room can posture severe fire and health and wellness hazards. Before air sealing and protecting an attic, ensure you or your professional address the complying with wellness and security issues. Examine the smokeshaft and surrounding mounting for indicators of charring, soot down payments, collapsing masonry or mortar, or proof that the chimney cellular lining is wearing away.


Have a smokeshaft professional fixing, seal and shield it at the exact same time. Generally a gap exists where a stonework chimney goes through the attic. To air seal this area, initially install sheet steel flashing to link this space and afterwards seal all the joints with a non-combustible sealer (make sure the product is rated for this application).


An air and vapour obstacle covers the floor of the attic space and is secured to the joists with acoustical sealant. Factory-built steel smokeshafts should be maintained from getting in touch with insulation by a minimum 75 mm (3 in.) unless otherwise specified by producer or local authorities. Set up a non-flammable radiation shield that keeps a 75-mm (3-in.) air room in between the chimney and insulation.

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The top of the radiation shield need to likewise be a minimum of 75 mm (3 in.) greater than the level of existing or brand-new insulation to be included. To stop insulation from falling back the guard, attach a clamp-type tornado collar without sealant at the top of the radiation shield, 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 materials. The top of the barrier is a storm collar secured, not secured, to the chimney. Above the ceiling, the air and vapour barrier is twisted around the drywall to contact the firestop sealer.


A collar-like ceiling trim plate is attached listed below the firestop. Work securely around electrical circuitry (switch off the power). Speak with an electric professional if questionable electrical wiring or corroded electrical connections are existing. Typical interior recessed lights are challenging to air seal successfully and can come to be a fire risk if covered with insulation.

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As a choice to typical recessed or pot lights consider light-emitting diode (LED) flush or level place components for better energy effectiveness. This also uses the opportunity to much better seal and shield the existing tooth cavity. Guarantee that fixture installation instructions are followed. If you find a substantial amount of animal droppings and vermin in the attic room, do not interrupt them because they can harbour quickly air-borne moulds, bloodsucker eggs and bacteria that can create extreme disease.


Seal the adhering to areas: Around the pipes stack and any various other pipes. For plastic plumbing heaps that move up and down as a result of thermal development, use an adaptable gasket or a polyethylene sleeve secured to a plywood collar (see Number 5-6). Around cables or ceiling light fixtures that pass through the attic room flooring and dividers and exterior wall leading plates (see Figure 5-7 and Number 5-8).

Around the chimney. Building regulations require that air rooms in between chimneys and floor or ceiling assemblies whereby they pass be secured with a non-combustible fire stop (see Figure 5-3 and Number 5-4). Along the edge of shared walls. There is often a void between the celebration wall surface (such as the common wall in between devices in duplexes, triplexes and row houses) and the side of the attic room flooring.

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


After air sealing, attic air flow is your second line of defence against the water vapour that might have discovered its method into the attic room. It ensures a colder, well-vented attic room less susceptible to the formation of ice dams at the eaves.




You may need to locate roofing system or soffit vents from outdoors if they are not clearly noticeable from inside the attic room. Residences with actually peaked roofing systems and obtainable attic rooms are the simplest to air vent by using the ratio of 1 to 300. This proportion describes unblocked vent area to the protected ceiling location.


Do not utilize electrical exhaust fans for attic ventilation as these can attract a lot more air than can be supplied through the soffit vents. This will actually draw residence air right into the attic, leading to better warm loss and moisture build-up. They are also prone to failing, noise production and enhanced energy usage.

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The adhering to Parts information the finest strategy depending on your attic room type. After you have checked the attic and carried out any therapeutic job, emphasis initially on air and wetness control.


On the various other hand, spray foam offers air sealing and a preliminary layer of high top quality insulation that can be topped up to the preferred RSI (R) degree (Attic their explanation insulation). If the attic retrofit is being finished combined with indoor improvements, the simplest approach is to install a new, single air and vapour barrier on the bottom of the ceiling joists

Building codes call for that air areas in between smokeshafts and floor or ceiling settings up with which they pass be sealed with a non-combustible fire stop (see Figure 5-3 and Figure 5-4). There is frequently a gap between the event wall surface (such as the shared wall between devices in duplexes, triplexes and row houses) and the edge of the attic room flooring.


A hefty polyethylene sheet which is caulked with acoustical sealant and stapled to the ceiling encases the electrical box. An electric wire leads away from the electric box and down through a hole right into an indoor wall. Openings around electric cables are loaded with caulking or foam sealer, and caulking seals spaces along the top of the interior wall surfaces.

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After air sealing, attic room ventilation is your second line of defence against the water vapour that might have found its method into the attic room. It guarantees a chillier, well-vented attic room area much less susceptible to the formation of ice dams at the eaves.


You may have to situate roofing system or soffit vents from outdoors if they are not clearly noticeable from inside the attic room. Houses with actually peaked roofings and accessible attics are the most convenient to air vent by utilizing the ratio of 1 to 300. This ratio describes unobstructed vent location to the insulated ceiling location.


Also, do not utilize electrical exhaust followers for attic air flow as these can attract extra air than can be supplied via the soffit vents. This will really draw residence air into the attic, resulting in greater warm loss and wetness accumulation. They are likewise prone to failure, sound production and boosted power use.

The complying with Components detail the finest strategy depending on your attic room kind. After you have checked the attic and brought out any restorative work, emphasis initially on air and wetness control.

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On the other hand, spray foam offers air securing and a first layer of premium quality insulation that can be covered approximately the desired RSI (R) level. If the attic retrofit is being completed together with interior restorations, the simplest approach is to mount a brand-new, single air and vapour obstacle on the bottom of the ceiling joists.